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Патент USA US2137517

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Nov. 22, 1938.
J. wlcKs
2,137,517
TELEPHONE SYSTEM
Filed May 3, 1937
3 Sheets-Sheet 1
INVENTOR.
JOHN
BYÉDM'A.,
wlcKs
JM@ nmz,
ATTORNEYS.
Nov. 22, 1938.
J, wlcKs
2,137,517
TELEPHONE SYSTEM
Filed May 5, 1957
5 Sheets-Sheet 2
zNvENIoR.
`
JOHN wlCKs
BYOQM, ï'mßy, 5mg sxfsî.,
ATTORNEYS.
Nov. 22, 1938.
2,137,517
J. WICKS
TELEPHONE SYSTEM
Filed May 3, 1937
3 Sheets-Sheet 3
,
INVBNTOR.
'
JOHN wlcKs
BY @am, ¿lla-«7, SMZAÃJM/
ATTORNEY5
Patented Nov. 22, 193s
2,137,517
UNITED STATES PATENT OFFICE
2,137 ,517
TELEPHONE SYSTEM
John Wicks, Oak Park, Ill.,` assignor to Associated
Electric Laboratories, Inc., Chicago, Ill., a. cor
poration of_ Delaware
Application May 3, 1937, serial No. 140,317
29 claims.
The present invention relates to signalling systems and more particularly to automatic switches
of the so-called cross bar type for use in setting
up connections between the various lines of an»
5 automatic telephone system,
It is well known that the method by which a
connection is established from one line of a tele-
l0
l5
2O
25
(ci. 179-21)
and the bars are not suñlciently positive to insure
completely faithful operation oi the switch.
It is an object of the present invention, there
fore, to provide inatelephone system an improved
form of automatic switch of the cross bar type 5
which is of simple and economical and rugged
construction and which obviates the disadvan
phone system to any desired second line in the tages of conventional switches of this type as
system consists of routing a connectionby way pointed out above.
of trailic concentration switches, and two or more
VMore Specifically, it is an object of the inventandem connected impulse responsive numerical tion t0 provide an automatic Switch of the char
switches which operate automatically to select the acte-r noted Which may readily be substituted for
desired line and to establish a connection thereto.
any of the well-known forms of step-by-step
Various types of numerical switches for perform- numerical SWitCl’leS in an installed System and
ing the functions noted are known to the ern wherein there is insured positive engagement bePerhaps the best known and most commonly used tween the contacts associated with the line incom
switch of this type isx the Srl-called Strowgcr ing to the switch and the contacts associated with
switch employing a movable wiper mechanism any selected Outgoing line, the number 0f relays
having two directions of movement. The compli- for actuating the Various contact sets is reduced
cated nature of this type of switch’has led to con- t0 e minimum, and the COI1tr0l apparatus, Wheresiderable research in attempts to secure more sim- by a particular line OutgOìng frOm the Switch iS
ple and less expensive switches' capable of per- Selected, lS Simple in the eXtreme. ,
forming the same functions, one of the out..
The improved automaticswitch, as described in
growths of this development is the so-called cross; n detail hereinafter. iS SllOWrl eS- being embodied in
bar type of switch, of which several modiiications all elltOmatiC telephone System 0f the general
have been devise@ one of the best known and character briefly described above and which com
most. Successful forms 0f the cross bar Switch yet DI‘lSeS line Switches individual t0 Bach 0f 'the lines
developed is that employlng Stationary conductors 0r bars arranged in Sets leading t0 the lines
3 O outgoing from the switch and wipers or contacts
connected to the incoming trunk line of the switch
and arranged selectively to be brought into engagement with the sets of bars, corresponding to
the various outgoing lines, by actuating means in
35 the form of relays. 'rnc method of selection of a
particular line in the outgoing group of lines to
l0
l5
20
25
included in the system, groups of iirst numerical
OI‘ intermediate Select/O1’ SWÍl'lChBS t0 Which the line
Switches are accessible, and groups 0f final nu- 3o
merical or connector switches which are accessible
to each of the intermediate selector switches. In
general, the objects as set forth above are realized
in aeeoi‘danee with tile present invelltîOIl by PrO
vidins as the intermediate and ñnal numerical 35
switches automatic switches each of which com
which the switch has access is accomplished by 'DI'lSeS a plurality ef gr011DS~0f C0r_1teCtS,eB«eh grOllD
control means for the wiper actuating relays, this
control moans functioning in responso to received
40 impulses transmitted from a calling substation to
u; ci
being arranged 1n SetS lnellldlrlg One 0r more
individual contacts, each set ,beine mdlvidually
Connected t0 the une incommg „t0 me SWltCh, 40
select a particular relay, following which the
selected relay is energized to establish a connec-
actuatmg means common to each grou? Pf con"
mots for moving the Same from (lne posmon to a'
tion between the incoming
trunk line- to the switch
~
secìngtposìä‘äl¿j(iigrëiäilîâî‘ìdgëgïâèâäìäpseîê
con a
s, e
âggcîììâeêgêïCàfoäìïêäîläîìletvgïïàeaïîrîîâfîn
.
.
a few countries, 1t has not been generally accepted
as a substitute for the Strowger type of Switch
`
.
.
.
_
bec-ws@ o? @81mm dlsadvaf‘tages 1n regard to lts
50 Constructlonal and cfperatlonal features-
AS an
individually connected to the lines outgoing from 45
the switch actuating means common to each of
’
-
.
~
the second mentioned group of contacts for
m
ov
-
ing the same from one position to a second posi
tion, and control means for selectively energizing
the actuating means in accordance with received 50
eaample of these dlsadvantages there may be
impulses transmitted to the switch; the contacts
Clted the feet that the Centrel means, whereby
deSired Ones 0f the Wiper eßtlleting relays are
selected, is of a complicated nature and the fact
of the first-mentioned plurality of groups of con
tacts being so arranged relative to the contacts of
the second-mentioned plurality of groups ci con
55 that the connections. secured between the wipers
tacts thatV when the contacts of one group of each 55
2,187,541?
. 2
plurality of_ groups are moved to their respective
second positions, the one or more individual con
tacts of a single set included in the moved group
of the first-mentioned plurality ci groups engage
the one or more individual contacts ci a single
set included in the moved group of the second
mentioned plurality oi' groups.
‘
More specifically, the actuating means for each
group of contact sets comprises a single bar
10 associated with the _contacts of the correspond
ing group and adapted to be movedirom one
position to a second position by a single operating
magnet. In an arrangement for serving one
hundred lines, ten vertical bars requiring ten
operating magnets hereinafter designated as
vertical magnets and ten horizontal bars requir
ing ten operating magnets hereinafter designated
as horizontal magnets must be provided, each oi
the vertical and horizontal bars being arranged
20 simultaneously to actuate ten contact sets.
The control means included in the automatic
switch comprises a single stepping switch of the
rotary type having a normal position and a plu
rality of ofi-normal positions each of which cor
25 responds to a group of' lines in the plurality of
lines outgoing from the switch and a particular
line in each group. More specifically, the step
ping switch includes a plurality of sets of con
tacts‘, wipers individually associated with the
30 contact sets, and a motor magnet for causing
repeated operations of the switch, to select a
desired group of lines and a particular line in
the selected group. The motor magnet for vac
tuating the wipers of the switch is under the
85 control of impulse responsive means compris
ing a line relay, and this means is arranged in
different manners depending upon whether the
switch is to be used as an intermediate selector
unit or a ñnal selector unit. In the first-men
tioned case, the control means operates in re
sponse to a predetermined` series of received im
pulses to cause the motor magnet to step the
wipers of the stepping switch to a position cor
responding to the selected group of outgoing lines,
45 _following which the motor magnet is automati
cally conditioned to cause the wipers to continue
to be stepped, thereby automatically to test the
lines of this group until an idle line in the selected
group is found. Following the selection of an
50 idle line in the selected group, means operate to
reenergize the motor magnet, thereby to restore
the stepping switch to normal.
When used as
a iinal selector or connector unit, the control
means associated with the stepping switch in
55 cludes means for causing the wipers of the switch
to be returned to normal at the conclusion of
the first or tens series of received impulses and
following the selection of a desired group of
lines, following which the wipers are stepped in
60 accordance with the impulses of the final or units
series of received impulses at the rate of one
step for each impulse until the wipers stand op
posite the position corresponding to the par
ticular called line in the selected group of lines.
65 As will be brought out in greater detail herein
after, the mechanism of the automatic switch
as well as the control means associated there
with for procuring the form of operation brieñy
described above is exceedingly simple .in ar
rangement and reliable in operation.
The novel features believed to be character
istîc of the invention are set forth with particu
larity in the appended claims.
The invention
itself, however, both as to its organization and
75 method of operation, together with further ob
jects and advantages thereof, will best be under
stood by reference to the speciiication taken in
connection with the accompanying drawings, in
which Figure 1 illustrates the general structural
i'eatures of an automatic switch constructed in
accordance with the present invention; Fig. 2 il
lustrates the details oi one Aoi' the horizontal
magnets included in the switch oi.' Fig. 1; Fig. 8
illustrates the details oi' one of the vertical mag
nets included in the switch of Fig. 1; Figs. 4 to 8, 10
inclusive, illustrate the three contact positions
for the contact springs included in a contact
spring assembly
magnet of Fig. 3
Fig. 4; and Figs.
telephone system
associated with the vertical
and the horizontal magnet of
7 and 8 illustrate a complete 15
including automatic switches
of the form shown in Fig. 1 used both as the
intermediate and final selector units. -
Referring now more particularly to Fig. 1 oi.'
the drawings, the mechanical arrangement of 20
an automatic switch constructed and arranged in
accordance with the present invention is illus
trated. As shown, the switch mechanism is
adapted to be supported on shelves such, for ex
ample, as the shelves i3, I4, I5, I6 and i1 ex 25
tending between and secured to side member il
of a. frame I2. Mounted on each oi' the enumer
ated shelves is a horizontal magnet, those for
the shelves mentioned being indicated at I8, I9,'
20, 2| and 22, respectively. Each of these hori 30
zontal magnets includes an armature upon
which is mounted the horizontal member or bar
for actuating the group of contact sets corre
sponding tothe particular magnet. Thus, the
magnets i 8 to 22, inclusive, include, respectively, 35
armatures 23, 24, 25, 26 and 21, upon which are
mounted, respectively, the actuating bars 28, 29,
30, 3| and 32. Each of these bars is guided in
its movement in the vertical plane by guide lugs
mounted on the shelf carrying the associated 40
magnet in a manner identical with that shown
for the bar 28. The ends of the last-mentioned
bar ride in slots provided in the upright por
tions of lugs 33 and 34, mounted at either end of
the shelf I3. Each of the horizontal bars 2.8 to 45
32, inclusive, in cooperation with its respective
associated horizontal magnet comprises means
for actuating the contacts of an associated group
of contact sets from their respective normal po
sitions to their respective oir-normal positions. 50
Thus, the bar 28 has associated therewith a
group of contact sets, four of which are indi
cated at 35, 36, 31 and 38. Each of these con
tact sets includes one or more individual contacts.
If the size of the switch requires that a large 55
number of contact sets be placed under the con- .
trol of each horizontal bar, two horizontal mag
nets may be required for actuating each bar, one
magnet being positioned at each end of each
bar. It will readily be apparent how such ad 60
ditional magnets could be embodied in the struc
ture shown. It will further be apparent that the
two magnets associated with each bar could have
their respective windings connected in multiple
for simultaneous energization.
65
Mounted on the lower shelf I1 is a group of
vertical magnets. five of which are indicated at
3,9, 40, 4I, 42 and 43, which individually include,
in the order named, armatures 44, 45, 46, 41 and
48. ' Each of these armatures is arranged to 70
actuate a vertical bar associated with one group
of vertical contact sets and guided in its move
ment by a pair of brackets projecting outwardly
from the shelves I3 and I6. These brackets,
comprising the pair for guiding the bar associ 75
3
2,187,517
ated with the magnet 39 in its movement, are
shown at 64 and 65. The bars associated with
the armatures noted are indicated at 49, 50, 5l.,
52 and 53, respectively, and each thereof carries
a plurality of projecting arms individually asso
ciated‘with one of the contact sets of the cor
~responding group of vertical contact sets. Thus,
the bar 49, which is under the control of the
magnet 39, carries a plurality of arms, five of
10 which are indicated at 54, 55, 56, 51 and 58, each
of which projects inwardly and sidewise from
the bar 49 so that, when the bar is pulled down
ward by the armature 44, all of the contacts in
cluded in the associated group of contact sets
are moved from their respective normal positions
to their respective oil-normal positions. The
Contact sets shown in association with the arms
assemblies, which individually comprise one con
tact of each of a pair of associated horizontal and
vertical contact sets, are carried by an extension
from the i'side piece 12. Thus, one of the assem
blies in t e pair of sets associated with the hori
- zontal bar 32 and the vertical bar 49 comprises
springs 14 and 15, mounted on the side piece 12
and insulated from each other by an insulating
member 16, and from the assembly `screws by
additional insulating members 11 as shown. The 10
armature 21 is pivoted at 19 and carries the
cross bar 32 for actuating the group of springs
including the contact set of which the spring 15
is a part.
This cross bar is insulated from the
spring 15 by an insulating member 80. Each of 15
the other contact springs associated with each of
the horizontal bars is similarly insulated from its
54 to 58, inclusive, of the vertical bar 49 are
indicated at 59, 60, 6l, 62 and 63, respectively.
associated bar.
Each of the contact sets includes one or more
spring 14 forms a part. is under the control of
the arm 58 projecting from the vertical bar 49.
This arm is insulated from the associated set of
individual contacts.
It will be understood that, when a switch of
the above-described form, designed to have ac
cess to one hundred outgoing lines, is selectively
il.) operated to connect a line incoming thereto to
any one of the outgoing lines, one hundred con
tact sets will be required in each of the plurality
of groups of contact sets associated respectively
with the horizontal and the vertical bars. This
30 necessarily means that ten vertical bars will be
required, each arranged to actuate a group of ten
contact sets, and ten horizontal bars will be re
quired. each similarly arranged to actuate a
group of ten contactsets. It will further be ap
parent that the conductors of the incoming line
including the trunk and test conductors thereof
The upper associated set of con
tact springs comprising the set, of which the
contact springs by an insulating member 8|.
Each of the other contact springs'associated with
each vertical bar is similarly insulated from the 25
corresponding bar.
Referring now to Fig. 3, there is illustrated
the vertical magnet 39 for actuating the Vertical
bar 49 associated with the contact set including
the contact spring 14.
This magnet comprises 30
a magnetic core having a central leg 94 having
a Winding 85 thereon, a heel piece 82, a side piece
83, and an armature 44. This armature is piv
oted at 81 and is arranged to actuate its asso
ciated vertical bar 49 through a toggle member 35
88. As will be pointed out in greater detail here
must necessarily be multipled between the cor- - inafter, the number of springs included in the
responding contacts of all of the contact sets of assembly of each of the contact sets associated
one plurality of groups of contact sets. Thus, if with a vertical bar is dependent upon whether
the automatic switch is to be used as an inter 40
40 the incoming line is connected to the plurality of
groups of contact sets associated with the hori
mediate or final selector unit. If used as an in
zontal bars, the conductors thereof must neces
termediate selector unit, three springs are, as
sarily terminate at each of the contact sets ac
shown, included in each third spring assembly,
tuated by each of these bars. The outgoing lines, the third spring 16 being utilized for testing the
on the other hand, terminate only at individual condition of the outgoing line terminating at the 45
ones of the opposite contact sets or, in the as
corresponding set of contacts. The remaining
sumed case, one line will terminate at each of two spring assemblies included in each associ
the contact sets 59, 60, 6l, 62, 63, etc. associated ated pair of Contact sets comprise only two con
tact springs, corresponding to the springs 14
with the vertical bars.
In order selectively to energize the various and 15 of the assembly shown. In the event the 50
vertical and horizontal magnets, there may be switch is to be used as a final selector unit, only
provided control means comprising a stepping the contact springs, corresponding to the upper
switch of the rotary type diagrammatically illus
and lower springs of the assembly shown, will
trated at 66, which includes two contact sets 61 be incorporated in each spring assembly, the cen
and 58. The individual contacts of the set 61 are tral spring corresponding to the spring 16 being 55
CA Ul
connected to one terminal of a corresponding omitted. If required, each of the horizontal and
vertical magnets may be provided with addition
horizontal magnet, HMI, HMZ, etc., and the in
dividual contacts of the set 68 terminate at one al armatures or contact springs for the purpose
terminal of a corresponding vertical magnet, of controlling the operation of `the switch. Any
VMI, VM2, etc., thereby to permit the various conventional manner of embodying such addi 60
magnets to be selectively energized. While this tional springs in the magnet structure may be
employed.
control means is described in greater detail here
In the operation of the switch as thus far
inafter, it is mentioned at this point in order to
facilitate an understanding of the manner in described, and when one of the vertical magnets
such, for example, as the magnet 39 is selected 65
which the switch mechanism operates.
Referring now more particularly to Fig. 2 of and energized, the bar 49 carried by the arma
the drawings, there are illustrated the details ture 44 thereof is moved downward to actuate
the contacts of all of the contact springs asso
of one of the horizontal magnets such, for ex
ample, as the magnet 22 shown in Fig. 1 and of ciated with this bar and included in the sets
one of the spring assemblies associated with the 59, 60, 6I, 62 and 63, from their respective nor 70
corresponding horizontal bar 32 and the vertical mal positions to their respective off-normal po
bar 49. This magnet includes a magnetic core sitions. This operation corresponds to the se
comprising a central leg 69 having a winding 10 lection of a particular group of outgoing lines
wound thereon, a heel piece 1l, a side piece 12, and, as will be pointed out in greater detail here
75 and an armature 21. , The various contact spring inafter, the particular vertical magnet which is 75
4
2,187,517
energized corresponds to a particular number of
impulses in a series of impulses received by the
switch. In the event the switch is used as an in
termediate selector unit, this operation causes
the contacts on the springs, corresponding to
the springs 14 and 10 and included in all of the
sets associated with the vertical bar 49, to make
contact, thereby to mark the condition of all
of the lines of the selected group in the bank
10 contacts of the rotary stepping switch, whereby
the lines in the selected group may be tested.
In the event the switch is to be used as a final
selector or connector unit, no such testing is
required, and this explains the reason why only
15 two contact springs are necessary in each spring
assembly embodied in this form of switch. _Fol
lowing the energization of one of the vertical
magnets, a selected one of the horizontal mag
nets such, for example, as the magnet 22, is en
tor switch and having bank contacts in which
the called subscriber’s line terminates. Thus,
in the system shown, the line | 00 terminates- at
a line switch |03, which switch has access to a
group of selector switches, one oi’ which is indi
cated generally at |04. 'I'he latter switch in turn
has access to groups of flnal selector or connec
tor switches, each connector switch of each group '
having its bank contacts multipled to the bank
contacts of the other switches in the same group 10
and connected to serve a corresponding group
oi' subscribers’ lines Y included in the system.
Thus, the selector, switch |04 has access to
connector switches, one oi' which is indicated
generally at |05, in the bank contact sets of 15
which the subscriber’s line |00’ terminates. It
is well known that by this general arrangement
any subscriber may by proper manipulation o!
ergized, thereby to actuate all of the contacts the impulsing device at his substation establish
a connection- between his line and any other 20
in the sets associated with the horizontal bar 32 idle
subscriber’s line in the system.
from their respective normal positions to their
Each
of the line switches included in the sys
respective oil-normal positions and to complete
a connection between'the line incoming to the tem, such, for example, as the line switch |03,
may be of any desired commercial construction,
25 switch and a particular one of the lines in the
selected group of lines outgoing from the switch. ‘ although preferably is oi' the well-known rotary
type having three levels of bank contacts, wipers
Thus, with the vertical magnet 39 and the hori
corresponding to the three levels, a ratchet and
zontal magnet 22 energized, only the contacts in
pawl mechanism for driving the wipers, an oper
cluded in the set of vertical contacts 63 will be ating magnet for actuating the ratchet and pawl
in engagement with the contacts of the associat
mechanism and control means whereby the op
ed horizontal contact set, the remaining contact erating magnet is energized to operate buzzer 30
sets being disengaged due to the deenergized con
fashion when a call is initiated on the line as
dition of the other vertical and horizontal mag
sociated with the corresponding line switch and
nets.
is deenergized when the wipers are rotated into
35
An understanding of the mode of operation engagement with a set of contacts corresponding
35
. just described is facilitated by considering the
to the first idle intermediate selector switch
sequence of contact spring movements illustrat
available.
20
ed in Figs. 4, 5 and 6, for the spring assembly 14,
15, 16 associated with the horizontal magnet 22
40 and the vertical magnet 39. Normally, and with
the two magnets noted deenergized, the springs
14, 15 and 16 are in the open contact positions il
lustrated in Fig. 4. With only the vertical mag
net 39 energized, the spring 14 is pushed down
45 so that the contacts on the springs 14 and 16
make contact, but the contacts between the
springs 'i4 and 15 remain disengaged, as shown
in Fig. 5. This permits the testing operations
noted above to\be performed. Thereafter, and
50 when the horizontal magnet 22 is energized, the
lower spring 15 is pushed up so that the contact
of this spring engages the contact of the spring
14, as shown in Fig. 6. Thus, it will be seen
that, with one horizontal magnet energized and
55 one vertical magnet energized, the incoming line
to the switch is connected only to a particular
one of the outgoing lines.
Referring now more particularly to Figs. ’7
and 8, considered together, there is illustrated a
60 telephone system wherein automatic switches of
the form just described are used as the impulse
responsive, intermediate and ñnal selector
switches. In general, the system comprises a
plurality of telephones or subscribers’ substa
65 tions, two of which are shown at A and B,
adapted to be interconnected by means includ
ing their respective subscribers’ lines | 00 and
|00’ and switch trains including the aforemen
tioned intermediate and ñnal selector switches.
70 These switch trains, when established, may in
dividually comprise the usual line switch associ
ated with each subscriber’s line, an intermediate
selector switch accessible to the line switch as
sociated with the subscriber’s line, and a final
75 selector switch accessible to the operated selec
Neglecting for the present the details of the
intermediate and final selector switches |04 and
|05, respectively, and the control means respec
tively included therein, the system as described 40
above is entirely conventional in form and its
operation is well understood in the art. In brief,
when a subscriber such, for example, as the sub
scriber at the telephone A initiates a call over the
line |00 to a second subscriber-’s telephone such, 45
for example, as the telephone B by lifting his
receiver from its hook, the line switch |03 as
sociated with the calling subscriber’s line oper
ates to select an idle intermediate selector switch
and to condition the same to be responsive to im 50
pulses transmit-ted from the impulsing device
at the telephone A.
As noted above, each of ì
the intermediate selector switches has access
to one or more final selector switches at which
any subscriber’s line of the system terminates. 55
Thus, if the intermediate selector switch |04, for
example, is seized by the line switch |03, it op
erates in response to the dialing of the ñrst digit
at the substationA to select a group of trunk
lines extending to the group of final selector 60
switches at which the called line |00’ termi
nates. Following this, the seized intermediate
selector switch |04 automatically selects a trunk
line leading to an idle ñnal selector switch in
the selected group of switches and connects the 65
calling subscriber’s line |00 through to seize
this idle ilnal selector switch. Thereafter, and
in response to the dialing of the second digit,
the seized ñnal selector switch selects the group
of lines in which the called subscriber’s line |00’ 70
is included. With the switch train in this con
dition, and when the iìnal or third digit is dialed,
the seized final selector switch selects the par
'ticular called line in the selected group of lines 75
5
2,187,517
and, if this line is idle, establishes a connection
between the calling and called lines when the
called telephone B is answered.
The system conventionally includes~ means
whereby ringing current and ring-back tone cur
rent are automatically transmitted, respectively,
to the substations of the called and calling par
ties in case the called line is idle and upon the
ñnal selector switch seizing the called line.
10 Also, in accordance with conventional practice,
means are provided whereby, in the event the
called line is found busy, the calling line is not
connected thereto and busy tone current is trans
mitted back over the established loop to the call
15 ing party to indicate the busy condition of the
called line. As will be pointed out in detail
hereinafter the arrangement is such- that the
switch train utilized in establishingthe con
nection is released only when the connection is
cleared out at the calling party's substation, the
associated springs 242, 264 and 24|, 263 comprise
the two other assemblies of the associated verti
cal and horizontal contact sets.
‘
The circuit arrangement of the control »means
included in the intermediate selector switch |04
is necessarily quite different from that of the
control means included in the switch |05. This
difference is necessitated by the fact that the
switch |04 need only operate in response to one
series of received impulses to select a particular 10
group of lines, following which it must operate
automatically to select an idle line in the se
lected group of lines, whereas the switch |05
must be responsive to two series of received im
pulses to select both the desired group of lines 15
and the particular called line in the selected
group.
This control means for the switch |04
to 6, inclusive, although it is noted that the sys
tem may only partially comprise switches of this
form, the remaining automatic switches being of
comprises a stepping switch of the rotary type
including three sets of contacts 2|4, 2|5 and 2|6,
wipers 201, 208 and 209 for respectively engaging 20
the enumerated sets of contacts, a ratchet and
pawl mechanism, not shown, for actuating the
wipers 201 to 209, inclusive, a rotary magnet
205 for actuating the ratchet and pawl mecha
nism, and oil-normal springs |60 for causing 25
the stepping switch to be returned to normal
when a connection utilizing the selector switch
|04 is released. The control means for the auto
any well-known step-by-step type wherein im
matic switch indicated also includes a plurality '
entire switch train being held operated when the
called party is the ilrst to hang up.
Each of the intermediate and final selector
switches preferably embodies the features of the
improved automatic switch illustrated in Figs. 1
30 pulse responsive means are utilized to control
the operation thereof. The selector switches |04
and |05 are, however, of the form illustrated in
the above noted figures and the mechanical con-`
structions of the two switches are identical with
35 the exception that the ñnal selector switch |05
includes only two springs in each contact spring
assembly whereas the switch |04 includes three
contact springs in the third contact spring as
' sembly included in each associated pair .of con
tact sets.
Two additional contact spring pairs
are associated with each of the horizontal and
vertical magnets included in each of the inter
mediate selector switches and` one additional
spring pair is associated with each of the hori
zontal and vertical magnets embodied in each
of the final selector switches, these additional
springs being used for control purposes in the
manner described hereinafter. The switch |04
of relays 200, 2|0, 220, 230, and 250, their con 30
trol and controlled circuits, arranged to operate
as described in detail hereinafter to insure the
automatic selection of an idle final selector
switch in a selected group of such switches in
the manner briefly referred to above.
35
The control means embodied in the final se
lector switch |05 similarly includes a stepping
switch of the rotary type comprising two sets of
contacts 3|1' and 3|8’, wipers 3|5’ and 316’ for
respectively engaging the two sets of contacts 40
named, a ratchet and pawl mechanism, not
shown, for actuating these wipers, a motor mag
net 301 for driving the ratchet and pawl mecha
nism and off-normal springs 300 for causing the
magnet 301 to return the stepping switch to 45
normal during the release of a connection in
which the automatic switch |05 is involved. This
control means also includes a plurality of relays
has access, over one hundred outgoing trunk
300, 3|0, 320, 330, 340, 350, 360, and 310, the con
lines, one of which is shown at |09', to each of
one hundred final selector switches and, simi
larly, each of the ñnal selector switches has ac
trol and controlled circuits, which relays in co 50
operation with the stepping switch are operable
in the manner set forth in detail hereinafter to
cause the switch |05 to perform the line selecting
cess to one hundred subscribers’ `lines terminat
ing at the contact springs associated with the
vertical bars of the switch. In view of the pre
vious description, it will be understood that the
springs 263 to 265, inclusive, comprise one con
tact set forminga part of a group of ten similar
contact sets under the control of the horizontal
actuating b_'ar associated with the horizontal
magnet 260 and that the contact set comprising
the springs 24| to 244, inclusive, is one of a
group of ten similar contact sets under the con
trol of the vertical actuating bar associated with
~ the vertical magnet 240. Similarly, the hori
zontal magnet 380 of the ñnal selector switch
|05, in cooperation with its associated horizontal
bar, controls a group of ten contact spring sets
including the set of springs 362, 383 and 384, and
the vertical magnet 390 in cooperation with its
associated vertical bar controls a group of con
tact sets including the contact springs 30|, 392
and 393. It will further be understood that the
contact springs 243, 244 and 265 comprise one
contact spring assembly and, similarly, that the
functions briefly described above. The switch |05
also has associated therewith ringing apparatus, 55
not shown, for transmitting ringing current to
a called subscriber’s line and ring-back tone
current to a calling subscriber’s line, and a gen
erator, not shown, for transmitting busy tone
current to a calling subscriber’s line in the even 60
a particular called line is found busy.
~
Considering now the detailed operati-on of the
intermediate selector switch |04 during the above
described sequence of operations, when this
switch is seized by the line switch |03, a circuit 65
is completed for energizing the line relay 200,
which circuit extends from ground at the upper
winding of the relay by way of this winding, to
the conductor |21, the armature 252, the trunk
conductor |01, the line'switch |03, the line con 70
ductor I0|, the bridge across the line |00 at the
calling substation A, the upper line conductor
|02, the line switch |03, the trunk conductor
|06, the armature 25|, the conductor |26, and the
lower winding of the relay 200 to battery. The 75
2,187,517
line relay 200 operates in response to its energi
zation over the above-traced circuit to complete,
at its armature 202 and associated- upper con
tact 203, a circuit for energizing the slow-to
release hold relay 2|0,-this circuit extending
from ground at the restored armature 255, by
way of the conductor |20, the armature 202, the
contact.- 203, and through the winding of the
hold relay 2|0 to battery. At its armature 20|,
associated ratchet and pawl mechanism, not
shown, steps the wipers 201 to 200, inclusive, one
step or> into engagement with the respective first
contacts of the three contact sets 2|4, 2|5 and
2| 6. Simultaneously the off-normal springs |60
are closed to prepare a circuit for causing the
motor magnet to restore the` wipers to their re
spective normal positions'. During each succeed
ing impulse of the series of impulses comprising
the first digit, the line relay 200 alternately> oper 10
10 the line relay 200 opens a point in the circuit for
energizing -the slow-to-release relay 220.
ates and restores to cause the motor magnet 205
in cooperation with its associated ratchet and
pawl mechanism to step the wipers 201 to 209,
inclusive. at the rate of one step for each im
- The hold relay 2| 0, upon operating, applies,
at its armature 2| |, ground to the control con
ductor |08, thereby to hold the line switch |03
15 operated and to maintain the calling line |00
pulse r'eceived by the automatic switch. During
such impulsing, the relays 2|0, 220 and 230, by
.virtue of their slow-to-release characteristics,
marked as busy in the banks of the final selector
switches. The application of ground to» this con
ductor completes an obvious circuit for holding
remain operated.
the lower winding of the polarized relay _250
20 energized, thereby .to render this relay exceed
ingly fast to operate when its upper winding is
energized. At its armature 2|2, the hold relay
2|0, upon operating, prepares a point in the cir
cuit ior energizing the relay 220. At its arma
25 ture 2|3, the relay 2|0 prepares a circuit for
energizing the motor magnet 205 of the rotary
stepping switch. At its armature 2|3', the holdv
relay 2|0 opens a point in a circuit, traced here
inafter, for -causing the motor magnet 205 to
30 return the wipers 201 to 209, inclusive, to their
respective normal positions following the selec
tion of a trunk line extending to an idle ñnal `
selector switch in a selected group.
With the
relays 200 and 2|0 of the switch |04 operated,
35 the control means included in this switch is con
ditioned to be responsive to the series oi' im
pulses comprising the first digit dialed at the
calling substation A.
~
At the beginning of the first impulse of this
40 digit, when the previously traced circuit for en
ergizing the line relay 200 is interrupted at the
impulsing device of the calling substation, this
relay restores to complete, at its armature 202
and associated contact 204, the previously pre
45 pared circuit for energizing the motor magnet
205, this circuit extending from ground on the
restored armature 255 by way of the conductor
|20. the armature 202 and associated contact 204,
the armature 2| 3, the conductor ||9 and the
winding of the magnet 205 to battery. Simul
taneously, the previously prepared circuit for
energizing the relay. 220 is completed at the ar
mature 20| of the line relay’200 and the ñrst
mentioned relay, namely, the relay 220, operates
to complete, at its armature 22| and the asso
ciated contact 222, an obvious circuit for ener
gizing the slow-to-release relay 230. 'I‘he relay
22, upon operating, also opens, at its armature
224,» a point in the circuit, traced hereinafter,
for energizing the upper winding of the polarized
relay 250. When the _relay 230 pulls up; it pre
pares, at its amature 232, a circuit for ener
gizing any one oi' the ten vertical magnets of
the switch |04 selected by the rotary stepping
switch, this circuit being held open at the oper
ated -armature 22| until the selection is made. At
its armature 23|, the relay 230, upon operating,
opens a point in an alternative circuit, traced
hereinafter, for energizing the winding of the
70 motor magnet 205.
At the beginning of the first pulse of the first
dialed digit, when the line relay 200 restores,
>the previously traced circuit for energizing the
motor magnet 205 is completed at the armature
75 202, and this magnet in cooperation with the
-
Since the outgoing line |00’ terminates at a
set of contacts under the control of the vertical
>magnet 240 corresponding to the third contact
of the contact set 2|4, the first digit dialed at
the calling substation will necessarily comprise
three impulses, so that, at the conclusion of this
digit, the wipers 201 to 209, inclusive, stand in
their respective third positions with the wiper
201 in engagement with the contact -correspond
ing to the vertical magnet 240. Shortly follow
ing the end of the ñrst digit, and with the line
relay 200 in its operated position such that the
circuit for energizing the relay 220 is interrupted
at the armature 20|, the last mentioned relay
restores to prepare, at its armature 224, a point
in the circuit for energizing the upper winding
of the polarized relay 250. At its armature 22|
and associated lower contact 223, the relay 220,
20
25
30
35
upon restoring, completes a circuit for energiz
ing the vertical magnet 240,_this circuit extend
ing from ground on the armature noted, by way
of the contact 223, the operated armature 232,
the conductor | 2|, the wiper 201 and its asso
ciated third contact, the conductor || 3, and the
winding of the vertical magnet 240 to battery.
This vertical magnet, upon operating, completes,
at its armature 245, a locking circuit extending
by _way of the conductor ||4 to ground on the
control conductor |08 for holding itself operated
independently of the rotary stepping switch. , At
its armature 246, the magnet 240-prepares a cir
cuit, traced hereinafter, for energizing the motor
magnet 205, by way of its self-interrupting con
y tacts 206.
'I'he magnet 240 in cooperation with
its associated vertical bar also actuates each of
the contact springs of all of the contact sets in
cluded in the group of ten sets associated there 55
with from their respective normal positions to
their respective off-normal positions. - Thus, the
contact springs 24|, 242 and 243 are pulled down
so that the spring 243 connected to the control
conductor of the trunk line leading to the final
selector switch |05 is connected to the spring
244 leading by way of the test conductor || 2 to
the ñrst contact in the contact level 2|5 asso
ciated with the wiper 208. It will be understood
that each of the remaining nine lines in the group 65
including the line |09', and terminating at the
contact sets in the same'group as the set 24|,
242, 243 have their respective control conductors
connected by way of a test conductor correspond
ing to the conductor ||2, vto a corresponding 70
contact of the contact level 2| 5. Thus, the switch
|04 is automatically conditioned to test the
trunks in the selected group of trunks until an
idle one thereof is found. As will be seen from
a consideration of the final selector switch |05,
2,187,517
if any particular final selector switch in the se
lected group is idle, battery is present on'the
control conductor corresponding to the conductor
II I, whereas if it is busy ground is present on
this conductor. Thus, when the switch I 05 is
idle, the armature 3| 2 of the hold relay 3|0 is
restored and battery is present on the control
conductor I I |. If, on the other hand, this switch
is busy, the armature 3I2 is operated andground
10 is present on the conductor III. `
The testing of the lines in the selected group is
initiated when the slow-to-release relay 230 falls
back shortly after the end of the ilrst dialed digit
and following the restoration of the relay 220,
15 When this occurs, the original circuit for energiz
ing the vertical magnet 240 is interrupted at the
armature 232 and a circuit is completed, at-the
armature 23|, for energizing the motor magnet
20,5, by way of its self-interrupting contacts 206,
20 this latter circuit extending from ground on the
control conductor |08, by Way of the conductor
II4, the armature 246, the conductor II6, the
armature 253 and associated contact 254, the con
ductor I|5, the armature 23|, the conductor H8,
and through the self-interrupting vcontacts 206
and the Winding of the motor magnet 205 to
battery. It will be observed that the Wipers 201
to 209, inclusive, of the stepping switch are not
restored to normal but start testing from the
30 position which they occupy at the conclusion of
the first digit. Thus, in the case under consider
ation, the wiper 208 stands in its third position
and tests successively the lines corresponding to
the contacts including and following the third
contact of the contact set 2I5.
In the event the
trunk line leading to the third ñnal selector switch
of the selected group is idle, the wiper temporarily
remains in this position, a circuit being corn
pleted at the contacts 243 and 244 immediately
40 the vertical magnet 240 operates for causing the
immediate operation of the polarized relay 250
before the motor magnet 205 has had suilìcient
time in which to operate in response to its energi
zation over the above traced circuit.
In the case
7
26|, the conductor |30. the armature 258, the
conductor |24, the wiper 200, and its associated
nrst contact, the conductor I20,'and through the
winding of the magnet 260 to battery. At- its
armature 261, the relay 250 interrupts the previ 5
ously traced circuit for energizing its upper -wind
ing but it remains operated by virtue of the ener
gized condition of its lower winding. At its arm
ature 256, this relay Iurt'her interrupts the oper
ating circuit of the hold relay 2|0 and opens a 10
point in the original circuit for energizing the
motor magnet 2_05. At its armature 253, the relay
250 prepares a third circuit for energizing the
motor magnet 205 to restore the wipers 201 to
209, inclusive, to normal, this latter circuit being
held open at the armature 2| 3’ until the hold
relay 2 I0 restores.
The horizontal magnet 260, upon being ener
gized in the above described manner, operates to
complete, at its armature 262, an obvious holding 20
circuit for itself and to interrupt, at its armature
26 I, a common point in the circuits for energizing
the other horizontal magnets. At its contact
springs 263, 264, and 265, the magnet 260 con
nects the trunk line |06’ incoming to the switch 25
|04 to the selected outgoing trunk line |09’. The
last mentioned operation extends the loop from
the calling subscriber’s substation A to the seized
ñnal selector switch »|05 and results in the ener
gization of the line relay 300 in the latter switch 30
over a circuit including this loop. This line relay,
upon operating, completes, at its armature 30|;
an obvious circuit for energizing vthe hold relay
3I0, which relay operates to apply, at the arma
ture 3 I2 and associated contact 3 I4, ground to the 35
control conductor III. This ground is extended
through the operated contact springs 243 and 265
to the control conductor |08, thereby to maintain
energized the- operated horizontal and vertical
magnets 260 and 240, respectively, independently 40
of the control means included in the intermediate
selector switch |04.
As a further consequence of the operation of the
polarized relay 250 in the switch |04, the operat
under consideration, however, it is assumed that ing circuit for the line relay 200 is interrupted at
the iinal selector switches in the selected group the armatures 25| and 252. This line relay, upon 45
and corresponding to the fourth to tenth con
falling back, at its armature 202 and associated
tacts inclusive, of the contact set 2|5 are busy contact 203, interrupts a further point in the
and that the switch I 05 corresponding to the ñrst previously traced operating circuit for the hold’
Contact of the set 2I5 is the iirst available idle relay 2|0. Restoration of the line relay 200 also
ñnal selector switch. Hence, the motor magnet causes the sequential operation of the relays 220 5.o
starts to operate buzzer fashion and in coopera
and 230, but these operations are without eiîect
tion with its associated ratchet and pawl mecha
at this time.
nism drives the wipers 201 to 209, inclusive, over»
When the hold relay 2|0 restores, shortly after
the enumerated contacts until the Wiper 208 en
gages the ñrst contact of the contact set 2I5,
whereupon a circuit is completed for energizing
the upper winding of the polarized relay 250, this
circuit extending from ground on the control con
60 ductor |08 by way of the conductor |28, the upper
winding of the relay 250; the conductor |29, the
restored armature 251, the restored armature 224,
the conductor |23, the wiper 208, the first contact
of the contact set 2|5, and the conductor ||2 to
65 battery on the control conductor III of the line
|09’. The polarized relay 250 immediately oper
ates and interrupts, at its armature 253 and asso
ciated contact 254, the previously traced operat
ing circuit for the motor magnet 205. At its
armature 258, the relay 250 completes a circuit
for energizing the winding of the horizontal mag
net 260, this circuit extending from ground by way
of the armatures, corresponding to the armature
26 I, associated with the other horizontal magnets
75 and indicated bythe dash line 26|', the armature
the application of ground to the conductor |08 at .
the armature 3I2 of the hold relay 3|0, it removes,
at'its armature 2II, multiple ground from the
control conductor |08. At its armature 2I3’, the
hold relay 2 I0 completes a circuit for again ener
gizing the motor magnet 205, this circuit extend 60
ing from ground on the control conductor |08, by
way of the conductor II4, the operated armature
246, the conductor I I6, the operated armature 253
and its associated contact 255, the conductor |25,
the armature 2I3’, the conductor |I1, the off 65
normal springs |60, th econductor IIB, and
through the self-interrupting contacts 206 and
the Winding of the motor magnet 205 to battery.
Restoratiton of the hold relay 2|0 results in the
interruption, at the armature 2|2, of the circuit
over which the relay 220 was reoperated, which
relay restores after an interval to cause the resto
ration of the relay 230, the restoration of the
relay 220, due to its slow-to-release character
istic, being subsequent to the return of the wipers
8
anni?
201 to 299, inclusive, .to normal or home positions
in the manner explained below.
The motor magnet 205, upon being energized
over the above traced circuit, operates buzzer
Gl fashion and in cooperation with its associated
ciated with the amature 344, a path for short
circuiting its upper winding, this path extend
ing from ground on'the control conductor |||,
by way'of the conductor IBI, the armature 344,
the said upper winding, the armature 345, and
ratchet and pawl mechanism drives the wipers back to ground at the armature 330. The re
201 to 209, inclusive, to their respective normal ` maining armatures 34| and 345 remain in their
- or home positions, at which time the oil-normal
respective restored positions until such 'time as
springs |60 open to interrupt the operating cir
the above-noted short circuit around the upper
10 cuit of this magnet. Thus. the rotary stepping
winding of the relay 340 is interrupted' to permit
switch is returned to normal immediately fol
the two windings of the relay to be energized in
lowing the seizure of an idle final selector switch
in the selected group. It is noted here that the
energization of the remaining horizontal mag
nets during the restoration of the stepping switch
to normal is prevented by the operation of the
armature 25| before the restoring operation oc
curs. _The polarized relay 250 upon operating
prepares a circuit for each of these magnets, but
these circuits include a common portion 26 I ' com
prising the series connected armatures, corre
sponding to and including the armature 20|.
Hence, when any one of the horizontal magnets
is energized the energizing circuit for each of the
25 other horizontal magnets is opened independent
ly of the relay 250. With the system in this con
dition, it will be seen that the connection has
been extended. to the seized iinal selector switch,
that'only the relay 250 and the magnets 240 and
30 260 of the switch |04 are operated, and that the
rotary stepping switch in the intermediate se
lector switch |04 is in its normal position ready
Ífor further use.
„
The operation of the line relay 300 and the
35 hold relay 3|0 in the seized final selector switch
|05 conditions this switch to be responsive to im
pulses comprising the two ñnal digits dialed at
the calling substation A.
series.
Returning again to the operations which occur
atA th'e beginning of the first impulse of the
second digit, when the relay 300 restores, a cir
cuit is completed for energizing the motor mag
net 301, this circuit extending from ground on
the armature 304, by way of the contact 305, vthe
armature 3|1, the conductor |49 and through the
winding of the motor magnet 301 to battery. The 20
magnet 301, thereupon and in conjunction with
its associated ratchet and pawl mechanism, drives
the wipers 3|5' and 3|6’ into engagement with
the first contacts of their respective associated
contact sets. When the wipers 3|5’ and 3|6’ of 25
the stepping switch take this first step, the oil?
normal springs 309 are closed, further to prepare
the circuit for-causing the motor magnet 301 to
restore these wipers to normal. The motor mag
net 301 is alternately energized and de-energized 30
in accordance with the impulses of the second
digit to step the wipers 3|5' and 3|0’ over their
respective associated contact sets at the rate of
one contact for each impulse. In the case under
consideration, wherein the called line |00’ is in a
group corresponding to the second contact of the
contact set 3|1', the second digit will necessarily
Thus, the hold relay ' comprise two impulses, _so that, at the conclusion
3|0, upon operating, applies, at its armature 3| |,
40 _ground to the conductor |43, to prepare holding
circuits for all of the vertical and horizontal
magnets included in the switch and for the ring
cut-olf relay 360 and the relay 310. At its ar
mature 3l5, the hold relay prepares a circuit for
45 energizing the slow-to-release relay 320, this cir
cuit being held open at the armature 30| and
associated contact 302 of the operated line relay
300. At its armature 3| 6, the relay 3|0 opens a
point in the circuit for energizing the magnet
50 301 by way of the off-normal springs 309 and, at
its armature 3 I1 it prepares an impulsing circuit
for energizing this magnet independently of the
springs 309.
At the beginning of the ñrst impulse of the
55 second digit dialed at the calling substation, the
line relay 300 restores, to complete, at its arma
ture 30| and associated contact 302, the above
mentioned circuit for energizing the relay 320
causing this relay to operate and complete, at its
60 armature 32| and associated contact 323, a cir
cuit for energizing the slow-to-release relay 330.
The last-mentioned relay, upon operating, com
pletes, at its armature 336 an obvious circuit for
energizing the lower winding of the relay 340.
65 Operation of the armature 335 of the relay 330
results in the preparation of a circuit, traced
hereinafter, for energizing a selected one oi' the
vertical magnets embodied in the switch. At its
armature 331, the relay 330 opens a point in a
70 circuit, traced hereinafter, f_or causing the motor
magnet 301 to'restore the wipers 3|5' and 3|5' to
normal following the seizure of the called line.
When the lower winding of the relay 340 is en
ergized in the above-described manner, this relay
75 operates to complete, at the “X” contacts asso
of the digit, the wipers 3|5' and 3|6' stand in en
gagement with their respective associated second 40
contacts. It will be understood that the relays
3|0, 320, and 330, due to their slow-to-release
characteristics, remain operated during such im
pulsing.
`
At the conclusion of the second digit, the line 45
relay 300 remains energized for a suiilcient period
of time to permit the relay 320 to restore. When
this occurs, a circuit is completed for energizing
the vertical magnet 390 corresponding to the
impulses comprising the digit dialed, this circuit 50
extending from ground on the restored armature
32| by way of the contact _3.22, the operated ar
mature 335, the restored armature 34|, the con
tact 342, the conductor |45, the wiper 3|5’ and
its associated second contact, the conductor- |59, 55
and through the winding of the magnet 390 to
battery. This magnet immediately operates its
armatures to complete, at the armature 394, a
locking circuit extending from ground on the
conductor |43 for holding itself operated. 'I‘he 60
magnet 390 in cooperation with its associated
vertical bar also operates all of the contact
springs in the group of contact spring setscom
prising the set of springs 39|, 392, and 393 from
their respective normal positions to their respec 65
tive off-normal positions.
It will be observed that, simultaneously with the
completion of the above-traced circuit for energiz
ing the magnet 390, the operating circuit -for the
relay 330 is interrupted at the armature 32| and 70
its associated contact 323. ’I'his relay restores
shortly after the vertical magnet 390 operates
to interrupt, at its armature '335, the above
traced original circuit for energizing the vertical
magnet noted. As a further consequence of the
l
2,137,517
restoration of the relay 330, a circuit is com
pleted at'the armature 331 for energizing the
motor magnet 301, to cause the wipers 3| 5' a-nd
3|6’ to be returned to their respective normal po
sitions, this circuit extending from ground on the
operated armature 304, by way of the contact
305, the restored armature 331, the conductor
|48, the closed off~normal springs 309, and
through the self-interrupting contacts 303 and
the winding of the magnet 301 to battery. The
motor magnet 301 thereupon operates buzzer
fashion and, in conjunction with its associated
ratchet and pawl mechanism, drives the wipers
3|5' and 3|6’ until they occupy their respective
15 normal positions, at which time the off-normal
springs 309 are opened to interrupt the circuit
of the magnet 301.
v
Simultaneously with the completion of the
last-mentioned circuit for energizing the motor
20 magnet 301, the previously traced short circuit
for the upper winding of the relay 340 is inter
rupted at the armature 336, thereby causing the
two windings of the relay 340 to be energized in
series. The relay 340, thereupon, fully operates
25 to interrupt at its armature 345 a further point
in the short-circuiting path for its upper wind
ing and to prepare, at its armature 34| and as
sociated contact 343, a circuit traced hereinaf
ter for energizing a selected one of the hori
30 zontal magnets embodied in the switch.
Thus,
the final selector switch |05 is conditioned to
be responsive to the impulses comprising the
third or units digit dialed at the calling sub
scriber’s substation A.
At the beginning of the first impulse of the
35
third digit, when the line relay 300 again re
stores, the relay 320 reoperates, and the circuit
for energizing the motor magnet 301 independ
ently of its self-interrupting contacts 303 is
40 again completed at the armature 304.
It is
9
operates its amature 33| to complete a locking
circuit for itself extending from ground on the
conductor |43 and by way of thev conductor |55.
This magnet, in cooperation with its associated
horizontal bar, also operates all of the contact
springs in the group of contact spring sets, in
cluding the set ot springs 382, 333 and 334, from
their respective normal positions to their respec
tive ofi-normal positions, whereby the contacts
of theA enumerated springs engage the respective 10
contacts of the operated springs 33| to 333, in
clusive, thereby to complete a connection be
tween the conductors |33, |34 and |40 of the
line incoming to the switch and the conductors
|35, |36 and |31, respectively, of the called line. 15
Shortly after the horizontal magnet 380 is ener
gized, and when the slow-to-release relay 330 falls
back, the previously traced circuit for energizing
the motor' magnet 301 by way of the oit-normal
springs 309 and the self-interrupting contacts 303 20
is again completed, thus causing the motor mag
net 301 in cooperation with its associated ratchet
and pawl mechanism to drive the wipers 3|5'
and 3|6' until they stand in their respective nor
mal positions, at which time the oiî-normal con» 25
tacts 309 open the circuit for the motor magnet.
The sequence of operations which occur follow
ing the seizure of the called line by the ilnal
selector switch |05 depends upon whether this line
is found idle or busy. ' Thus, at the time the called 30
line |00' is seized by the switch, the slow-to
release relay 330 is still operated so that a cir
cuit is prepared at the armature 33| and its asso
ciated contact 333 for energizing the busy relay
350. Now, if the called line is busy, ground is 35
present on the control conductor |31, whereas, if
the called line is idle, battery is present on this
conductor. Hence, if the line is busy at the time
it is seized, the above-noted circuit for energiz
ing the busy relay 350 is completed, this circuit 40
noted here that both the relays 320 and 330 re
extending from ground on the conductor |31, by
operate at the beginning of the third digit and
way of the springs 333 and 334, the conductor |40,
that the latter relay prepares, at its armature
335, a further point in the above-mentioned cir
cuit ior energizing a selected one of the hori
zontal magnets. When the motor magnet 301
is energized at the beginning of the iirst pulse,
, it causes the wipers 3I5' and 3|6' to be stepped
into engagement with their respective associated
iirst contacts and again closes the olf-normal
springs 309. The wipers 3|5’ and 3|6' are there
after stepped in accordance with the succeeding
impulses comprising the third digit at the rate
of one point per impulse.
In the present in
55 stance, Wherein 'the horizontal magnet 380 must
necessarily be energized in order to complete the
connection to the desired called line |00’ and
this magnet is associated with the third contact
of the contact set 3|8, the units digit will com
60 prise three impulses so that, at the conclusion
thereof, the wipers 3|5' and 3|6' stand on their
respective associated third contacts. With the
wiper 3|6’ in this position, and when the relay
320 restores shortly following the end of the
digit, a circuit is completed for energizing the
selected horizontal magnet 380, this circuit ex
tending from ground on the armature 32|, by
Way of the contact 322, the operated armature
335, the operated armature 34| and its associated
contact 343, the armature 355, the conductor |46,
the armature 312, the conductor |41, the wiper
3IB’ and its associated third contact, the con
ductor |38, and through the winding of the mag
net 380 to battery. The horizontal magnet 380,
when energized over the above-traced circuit,
the operated armature 33| and associated con
tact 333, the conductor |42 and through the wind
ing of the relay 350 to battery. This relay, upon 45
operating, interrupts, at its armature 352 and
associated contact 353, a point .in the circuit i'or
energizing the lower winding of the relay 310 and
prepares, at this same armature and the asso
ciated contact 354, an alternative circuit for hold
ing itself operated when the slow-to-release relay
330 restores; the alternative circuit noted extend
ing from ground on the control conductor |||,
by way of the operated armature 352 and asso
ciated contact 354, the conductor I4|, the con
50
55
tact 333, the armature 334, the conductor |42, and
through the winding of the busy relay to battery.
The busy relay 350, upon operating, also applies,
at its armature 35|, busy tone current to the loop
extending through the operated selector switch 60
|04 and the operated line switch |03 to the calling
subscriber’s substation to indicate to the calling
party thereat the busy condition of the called line.
When this occurs, the calling party may, by hang
ing up, interrupt the loop holding the line relay 65
300 operated, thereby to cause the hold relay 3|0
to restore. This latter relay, upon restoring its
armatures 3|| and 3|2, removes ground from the
control conductors || | and |00 and from the hold
conductor |43, whereupon the relays 250 and 350, 70
and the magnets 260, 240, 330 and 330 are de
energized and the switch train leading to the
called subscriber’s line is released.
It is pointed out that during the release of the
final selector switch |05, the line relay 300 upon 75
l0
2,137,517
restoring its armature 304 completes, at the con
to ground on the restored armature 364 and its
tact 306, a circuit for energizing the motor mag
associated contact 365. A portion of ythis current
net 301 and at its armature 310| a circuit for ener-_ is by-passed by way-oi’ the armature 313, the
glzing the relay 320. Both the magnet 301 and condenser |62 and the loop extending back to the
the relay 320 are only energized for a short inter
calling subscriber’s substation to the receiver at
val, the circuits noted being interrupted when the f this substation, thereby to indicate to the calling
hold relay 3I0 restores its armatures 3|5 and party that the called telephone is idle. It is
'3| 1. The relay 320 during the short period when noted that the relay 360 is so constructed that it
operated completes a circuit for energizing the does not operate in response to the energization
10 relay 330 which also operates. 'I'he short period
of its lower winding by the alternating ringing 10
of energization of the magnet 301 may be sum
current.
cient to cause the wipers 3|5' and 3|6' to be
stepped to their first off-normal positions, such
that the ofi-normal springs 309 are closed.
In
15 order to prevent the stepping switch comprising
the wipers noted from remaining in off-normal
positions an alternative circuit for energizing the
magnet 301 by way of the contacts 303 is pro
vided, this circuit being completed when the
20 relays 3|0 and 330 are de-energized and extending
from ground at the armature 3|6 by way of the
armature 331, the conductor |43, the otr-normal
springs 309, the self-interrupting contacts 308
and through the winding of the magnet 301 to
25 battery. 'I'his circuit is interrupted at the off
normal springs 309 following the return of the
stepping switch to its normal position. Thus, a
safeguard is provided for preventing the stepping
switch from being falsely retained in an off
30 normal position when the iinal selector switch |05
is released.
‘
'
In the event the called line |00’ is idle at
.time it is seized by the iinal selector switchbattery is present on the control conductor
and the busy relay 350 is not energized over
the
|05,
When the called party answers, a direct current
path is bridged across the line conductors |35
and |36 at the called substation, thereby to com
plete a direct current circuit for energizing the 15
lower winding of the ring cutoiI relay 360, which
circuit is identical with that traced above for
the ringing current and extends from battery'on
the conductor |53 to ground at the armature 364.
In response to the energization of its lower wind 20
ing, the relay 360 partially operates to complete
the “X” contacts associated with its armature 361,
thereby to cause the energization of its upper
winding. When this upper winding is energized,
the relay 360 fully operates to interrupt, at its
armature 363, the start circuit for the ringing
machine and to interrupt, at its armatures 36|
andk 364 and their respective associated contacts
362 and 365, the application oi’ ringing current
and ring-back tone current to the loops extending 30
respectively to the called and calling subscribers'
substations.` At these last mentioned armatures
and their respective associated contacts 363 and
366, the calling line is connected to the called line
so
that a conversational circuit is completed be 35
above-traced circuit. Shortly after the seizure tween
the calling telephone A and the called tele
of the line, and when the relay 330 restores, a cir . phone B. It is pointed out that talking battery is
cuit is completed for energizing the lower wind
supplied to the loop extending to the called sub
ing of the relay 310, this circuit extending from scriber’s
substation through the windings of the
battery on the control conductor |31, by way of impedance
element 395, which windings are con 40
'the operated springs 393 and 334, the conductor nected in series
with the exchange battery across
|40, the armature 33| and its associated contact the conductors |3| and |32. Similarly, talking`
|31
the
332, the conductor |39, the lower winding of the
relay noted, the conductor |44 and the restored
armature 352, to ground on the control conductor
III. The relay 310 operates, upon the energiza
tion of its lower winding, to complete, at its arma
ture 313, an obvious locking circuit for itself,
extending from ground on the conductor |43. At
50 its armature 31|, it applies ground to the con
ductor |40 leading to the control conductor |31,
thereby to mark the called line as busy at the
contact sets to whichA it is multipled and, at its
armature 312, it opens a point in the previously
55
traced original circuit for energizing the hori;-
zontal magnet 380. At its armature 314, the
relay 310, upon operating, applies ground to the
conductor |46 and, at its armature 315, it applies
ground to the ringing machine start conductor
60 I6I. At its armatures 311 and 316 the relay 310
completes paths for applying ringing current and
ring-back tone current to the loops extending
respectively to the called subscriber’s substation
and the calling subscriber’s substation.
Ringing current is conducted to the signal de
vice at the called subscriber’s substation B over
a path including the armature 311, conductor
|53, the lower winding of the ring cut-off relay
360, the conductor |52, the contact 362 and its
associated restored armature 36|, the conductor
|33, the operated springs 362 and 39|, the line
conductor |35, signal device bridged across the
line conductors |35 and |36 at the called substa
tion, the line conductor |36, the operated springs
75 392 and 363 and the conductor |34 and extending
battery is supplied to the loop extending to the
calling subscriber’s substation through the wind
ings of the line relay 300. The system remains 45
in this condition until the connection is cleared
out at the calling subscriber’s substation.
If the called party hangs up ñrst, nothing oc
curs, the entire switch train being held in its
operated condition by virtue of the fact that the 50
relay 300 is maintained energized over the closed
loop extending therefrom to the calling substa
tion, the hold relay 3|0 is held operated by the
line relay 300, and the relays 360 and 310 are
locked in their respective operated positions due 55
to the presence of ground on the conductor |43.
When, however, the calling party hangs up his
receiver to interrupt the circuit holding the line
relay 300 energized, this relay restores to open
the operating circuit for the hold relay 3|0. The
hold relay, upon restoring its armature 3| I, re
moves ground from the conductor |43, thereby to
interrupt the holding circuits for the magnets 300
and 390 and the relays 360 and 310. At its arma
ture 3| 2, the hold relay removes direct ground 65
from the control conductor HI. The two relays
360 and 310 in turn restore and the last men
tioned thereof removes, at its armature 31|,
ground `from the conductor |40. When the mag
nets 330 and 390 are de-energized, they restore 70
all of the armatures and contact springs, associ
ated respectively therewith, to~their respective
normal positions. The relay 310, upon restoring
its armature 31| to remove ground from the con
ductor I 40, completely removes ground from the 75
11
2,187,517
control conductor |||, thereby to interrupt the
circuits holding the magnets 240 and 200 and the
relay 250 operated. Thus, the >selectorswitch
|04 is released. Removal oi ground from thecontrol conductor |00 permits the line switch |03
to restore to normal, whereupon the entire switch
train utilized in setting up the connection be
tween the. substations A and B is released and all
of the switches involved therein are ready for
10
further use.
_
From the fo'regoing description oi the system,
it wf..l be apparent that the stepping switch in
cludci in each of the automatic selector switches
|04 and |05 is operable from a normal position
15 to a plurality of oir-normal positions, each of
which corresponds to a particular group of trunk
lines to which the switch |04 has access and also
to a particular trunk line in each group.
Thus,
when the stepping switch is operated to its first
20 oil-normal position such that the wipers 201 to
209, inclusive, stand in engagement with their
respective associated third contacts, it is condi
tioned to select the group of trunk lines which
terminate at the contact sets under the control
of the vertical magnet 240 and also to select the
third trunk line in this group. It follows, there
fore, that each of the contacts of the set 2|4 is
associated with a particular group of outgoing
trunk lines and that each of the contacts of the
30 set 2|5 is associated with a particular trunk line
in each group.
Following the group selection, as described
above, the means comprising the vertical magnet
240, the slow-to-release relay 230‘ and the motor
35 magnet 205 automatically operates to step the
stepping switch to a second position to select a
particular trunk line, corresponding to an idle
ñnal selector switch, in the selected group of
trunk lines. This last mentioned means is under
40 the control of means comprising the polarized
relay 250 which renders the motor magnet 205
inoperative to continue to step the wipers 201 to
209, inclusive, in the event the trunk line in the
selected group of trunk lines and corresponding
45 to the position of the stepping switch at the con
clusion of the group selection, is idle. Immedi
ately upon the completion of the iinal selection,
the means comprising one of the horizontal mag
nets, such, for example, as the magnet 260, op
50 erates, to establish a connection between the line
| 06', incoming to the switch |04, and the selected
outgoing line.
It will further be apparent that the stepping
switch of the final selector switch |05, while simi
55 lar' to that of the intermediate selector switch
|0'4 in that each off-normal position thereof cor
responds to a particular group of subscribers’
lines and a particular line in each group, differs
therefrom in the manner of its control. This dif
60 ference resides in the fact that the stepping
switch of the final selector switch |05 is repeated
ly operated from its normal position to one or
more of its off-normal positions to select a par
ticular group of subscribers’ lines including the
65 called line and to select the particular called line
of the selected group of lines.
While there has been described what is at
present considered to be the preferred embodi
ment of the invention, it will be understood that
various modifications may be made therein, and
it is contemplated in the appended claims to
75
contacts, actuating means individual to each of
said sets of contacts for moving the correspond
ing set of contacts from one position to a second
position, said contact sets being so arranged rela
tive to each other that the corresponding con
tacts of the respective sets engage only when the
contacts oi both of said sets are moved to their
respective second positions, a stepping switch, im
pulse responsive means for causing the operation
of said stepping switch to predetermined positions,
and means including said stepping switch for
successively energizing said actuating means.
2. An automatic switch comprising a group of
contacts arranged in sets, actuating means com
mon to said group of contacts `for moving the 15
same from one position to a second position, a
second group oi contacts arranged in sets, actuat
ing means common to said second group' of con
tacts for moving the same from one position to a
second position, the contacts of said first-named 20
group being so arranged relative to the contacts
of said second group that when the contacts of
both of said groups are moved to their respective
second positions the contacts of a single set in
cluded in said first-named group engage the con 25
tacts of a single set included in said second group,
a stepping switch, impulse responsive means for
causing the operation of said stepping switch to
predetermined positions, and means including V
said stepping switch for successively energizing 30
said actuating means.
'
3. An automatic switch comprising a ñrst
group of contacts, actuating means for moving
the contacts oi' said group from one position to
a second position, a plurality of groups of con 35
tacts, each of said groups of contacts being ar
ranged in sets, actuating means individually as
sociated with each of said plurality of groups of
contacts for moving the _contacts of the corre
sponding group from one position to a second 40
position, the contacts of said first group of con
tacts being so arranged relative to the contacts of
said plurality of groups of contacts that when
said ñrst-named actuating means and a selected
one of said last-named actuating means are en 45
ergized one set of contacts of said ñrst group
engages one set of contacts included in the group
of contacts with which said selected one of said
actuating means is associated, a stepping switch,
impulse responsive means for causing the opera
tion of said stepping switch to predetermined po
sitions, and means including said stepping switch
for successively energizing said first-named ac
tuating means and a selected one of said last
named actuating means.
4. An automatic switch comprising a plurality
of groups of contacts, actuating means individu
ally associated with each of said groups of con
tacts for moving the contacts of the correspond
ing group from one position to a second position, 60
a plurality of additional groups of contacts, actu
ating means individually associated with each of
said last-named groups of contacts, the contacts
of each of said groups being arranged in sets
and the contacts of said ñrst-named plurality of 65
groups of contacts being so arranged relative to
the contacts of said last-named plurality of
groups of contacts that when a selected one of
said first-named. actuating means and a selected
one of said last-named actuating means are en
cover all such modiñcations as fall within the
ergized one set of contacts of the contact group
associated with said selected one of said first
true spirit and scope of the invention.
I claim:
tacts of_ the _contact group associated with said
1. An automatic switch comprising two sets of
named actuating means engages one set of con
selected one of said last-named actuating means,
12
2,187,517
ia stepping switch, impulse responsive means for
causing‘the operation of said stepping-switch to
predetermined positions, and means including
said stepping switch for successively energizing
a selected one of said first-named actuating
means and a selected one of said last-named ac
tuating means.
‘
8. In a signalling system, a plurality of lines,
an automatic switch having access to said lines.
said switch comprising a stepping switch opera
ble to a plurality of positions, each of said posi
tions corresponding to a group of said plurality
of lines and a particular line in each group, .
means including means responsive to a predeter
5. An automatic switch comprising a pair of
members, a group of contacts associated with
10 each of said members, each of said groups of
mined number of received impulses for operating
said stepping switch to one of said positions to
contacts being arranged in sets and adapted to
be moved by the corresponding member, actu
ating means comprising a magnet individually
associated with said members for moving the
operative following the selection of said group
of lines for operating said` stepping switch to a
second position to select a particular line in said
15 corresponding member from one position to a
second position, said members being so arranged
relative to each other that when both`th`ereof
are moved to their respective second positions
the contacts of a single set of contacts associated
20 with one of said members engage the contacts
of a single set of contacts associated with the
other of said members, circuits for energizing
said magnets, a stepping switch, impulse respon
sive means for causing the operation of said
25
stepping switch to predetermined positions, and
means including said stepping switch for com
pleting said circuits.
6. An automatic switch comprising a_ ilrst
member, a group of members, a group of con
30 tacts associated with each oi’ said members, each
of said groups of contacts being arranged in
sets and adapted to be moved by the .correspond
ing member, actuating means comprising a mag
net individually associated with each of said
members for moving the corresponding mem
ber from one position to a second position, said
iirst member being so arranged relative to said
group- of members that when the magnet asso
ciated therewith and one of the magnets asso
40 ciated with one of the members of said ‘group
of members are energized, the contacts of a
single set of contacts of the group associated
with said first member engage the contacts ofv
a single set of contacts ofthe group associated
45 with said one member of said group of members,
circuits for energizing said magnets, a stepping
switch, impulse responsive means for causing the
operation of said stepping switch to predeter
mined positions, and means including said step
50 ping switch for successively energizing the mag
.net associated with said first member and a
selected one of the magnets individually associat
ed with each of the members of said group of
55
members.
7. An automatic switch comprising a plurality
of members divided into two groups, a group
of contacts associated with each of said mem
bers, _each of said groups of contacts being ar
ranged in sets and adapted to be moved by the
60
corresponding member, actuating means compris
ing a magnet associated with each of said mem
bers for moving the' corresponding member from
one position to a second position, control means
for selectively energizing said magnets, the mem
65 bers _of one of said groups being so arranged
relative to the members in the other of said
groups that when the magnet associated with
a selected one of the members of one group and
the magnet associated with a selected one of
70 the members of the other group are energized
the contacts of a single set of contacts associated
with said one of said members of said one group
engages the contacts of a single set of contacts
associated with said one of said members of the
75 other group.
select a particular group of lines, and means
selected group of lines.
9. In a signalling system, a plurality of lines, 15
an automatic switch having access to said lines,
said automatic switch comprising a stepping
switch including a plurality of sets of contacts
and wipers individually associated with said con
tact sets, each contact of one of said sets being 20
associated with a group of said plurality of lines
and each contact of a second set being associated
with a particular line in each of said group of
' lines, a motor magnet for driving said wipers,
means for energizing said motor magnet in ac 25
cordance with the impulses of a predetermined
~series of received impulses to drive said wipers
until the wiper associated with said one contact
set engages the. contact associated with the one
group of lines corresponding to the impulses of 30
said series of impulses, and means for thereafter
energizing said motor magnet to drive said wlp
ers until the wiper associated with said second
contact set engages the contact associated with
a particular desired line in said one group of
35
lines.
10. In a signalling system, a plurality of lines,
an automatic switch having access to said lines,
an incoming line to said switch, said switch com
prising a stepping switch operable to a plurality
of positions, each of said positions corresponding 40
to a group of said plurality of lines and a par
ticular line in each group, means including means
responsive to a predetermined series of received
impulses for operating said stepping switch to
one of said positions to select a particular group 45
of lines, means operative following the selection
of said particular group of lines for operating
said stepping switch to a second position to se
lect a particular line in said selected group of
lines, and means automatically operative fol 50
lowing the selection of said particular line for
establishing a connection between said incoming
line and said particular line.
11. In a signalling system, a plurality of lines,
an automatic switch having access to said lines,
an incoming line to said switch, said automatic
switch comprising -a stepping switch having a
plurality >of sets of contacts and wipers indi
vidually associated with said contact sets, each 60
contact of one of said sets being associated with
a group of said plurality of lines and each con
tact of a second set being associated with a par
ticular line in each of said groups of lines, a
motor magnet for driving said wipers, means for 65
energizing said motor magnet in accordance with
a predetermined series of received impulses to
drive said wipers until the wiper associated with
said one set engages the contact associated with
the one group of lines corresponding to the im 70
pulses of said series of impulses, means for there
after energizing said motor magnet to drive said
wipers until the wiper associated with said sec
ond contact set engages a contact associated with
a particular line of said one group of lines there- 75
2,137,517
by to select said particular line, and means re
the selection of said group of lines for operating
sponsive to the selection of said particular line "t said stepping switch to a second Voff-normal posi
for establishing a connection between said incom
tion to select a particular line in said selected
ing line and said particular line.
12. In a signalling system, an automatic switch
group, means automatically operative following
the selection of said particular line' for establish
comprising a plurality of groups of contact sets,
a plurality of additional groups of contact sets,
ing a connection between said incoming line and
actuating means individually associated with
operative immediately following the selection of
each of said groups of contact sets for moving
the contacts of the contact sets included in the
said particular line for restoring saidstepping
corresponding group from one position to a sec
ond position, a plurality of lines individual ones
15'. In a telephone system a plurality oi selector
switches, an additional selector switch having ac
cess to »each of said plurality of selector switches,
of which terminate at individual contact sets of
said second-named plurality of groups of con
tact sets, an incoming line to said switch, said
incoming line terminating at each of the contact
sets of said first-named plurality of groups of
contact sets, a stepping switch included in said
automatic switch and operable to a plurality of
20 positions, each of said positions corresponding
to one of the actuating means associated with
one of the groups of contact sets included in said
first-named plurality of groups of contact sets
and to one of the actuating means associated
25 with one of the groups of contact sets included
in said second-named plurality of groups of con
tact sets, means including means responsive to
a predetermined series of received impulses for
operating said stepping switch to one of said posi
30 tions, the actuating means for moving the con
tacts included in. one group of said first-named
plurality of groups and corresponding to Asaid
position being energized when said switch is op
erated to said one position, whereby a particu
35 lar group of said plurality of lines is selected,
means operative following the selection of said
particular group for operating said switch to a
second position, the actuating means for moving
the contacts included in one group of said sec
40 ond-named plurality of groups and correspond
ing to said second position being energized to
connect said incoming line to a particular line
in said selected group of lines when said switch
is operated to said second position.
45
13. In a signalling system, a plurality of lines,
an automatic switch having access to said lines,
said switch comprising a stepping switch having
a normal position and being operable to a plu
rality of olf-normal positions, each of said oiï
50 normal positions corresponding to a group of
said plurality of lines and to a particular line
in each group, means including means respon
sive to a predetermined series of received im
pulses for operating said stepping switchv to one
55 of said off-normal positions to select a particu
lar group of lines, means operative following the
selection of said group of lines for operating
said stepping switch to a second off-normal posi
tion to select a particular line in said selected
60 group of lines, and means automatically opera
tive immediately following the selection of said
particular line for restoring said stepping switch
to normal.
14. In a signalling system, a plurality of lines,
65 an automatic switch having access to said lines,
an incoming line to said switch, said switch com
prising a stepping switch having a normal posi
tion and a plurality of oli-normal positions, each
of said off-normal positions corresponding to a
70 group of said plurality of lines and to a particu
lar line in each group, means including means
responsive to a predetermined series of received
impulses for operating said stepping switch to
one of said off-normal positions to select a par
75 ticular group of lines, means operative following
said particular line, and means automatically
switch to normal.
.
10
said additional switch comprising a stepping
switch having a plurality of positions, each of 15
said positions corresponding to a group of said
plurality of selector switches and to a particular
switch in each group, means including means re
sponsive to a predetermined series of received im
pulses for operating said stepping switch to one 420
of said positions to select a particular group of
said plurality of selector switches, and means for
causing said switch to continue operating from
position to position until it stands in a position
corresponding to an idle switch in said selected 25
group.
16. In a telephone system a plurality oi' selector
switches, an additional selector switch having ac
cess to each of said plurality of selector switches,
said additional switch comprising a stepping -30
switch having a plurality of positions, each of
said positions corresponding to a group of said
plurality of selector switches and to a particular
switch in each group, means including means
responsive to a predetermined series of received 35
impulses for operating said stepping switch to one
Vof said positions to select a particular group of
said plurality of selector switches, means for
causing said switch to continue operating from
position to position until it stands in a position 40
corresponding to an idle switch in said selected
group, and means for rendering said last-named
means inoperative in the event the selector switch
in said selected group of selector switches and
corresponding to said one position of said step 45
ping switch is idle.
17. In a telephone system, a plurality of selec
tor switches, an additional selector switch having
access to each of said plurality of switches, an
incoming line to said additional switch, said ad .50
ditional switch comprim‘ng a stepping switch hav
ing a plurality of positions, each of said positions
corresponding to a group of said plurality of se
lector switches and to a particular switch in each
group, means including means responsive to a 55
predetermined series of received impulses for op-v
erating said stepping switch to one of said posi
tions to select a particular group of said plu
rality of selector switches, means for causing said
stepping switch to continue operating from posi ,
60
tion to position until it stands in a position cor
responding to an idle selector switch in said se
lected group, means for rendering said last
named means inoperative in the event the selec
tor switch in said selected group and correspond 65
ing to said one position of said stepping switch'.
is idle, and means operative when an idle selec-.
tor switch in said selected group is found for
connecting said incoming line through to said idle
selector switch.
70
18. In a telephone system, a plurality of selec
tor switches, an additional selector switch having
access to each of said plurality of switches, an
incoming line to said additional switch, said ad
ditional switch comprising a stepping switch hav 75
14
2,187,517
ing a normal position and a plurality of off-nor
lector switches andá-to a particular switch in each
positions, each of said oil-normal positions cor
responding to a group of said plurality oi' lines
and to a particular line in each group, means
including means responsive to one predeter
group, means including means responsive to a
mined series of received impulses foroperating
series of received impulses for operating said
stepping switch tò one of said olf-normal posi
said stepping switch to one of said off-.normal
positions to select a particular group of said
lines, means operative following the selection of
said group of lines for returning said stepping
switch to its normal position, said iirst-named l0
means being thereafter responsive to a second
mal positions, each of said off-normal positions
corresponding to a group of said plurality of se
tions to select a particular group of said plu
rality of selector switches, means for causing
10 said stepping switch to continue operating from
position to position until it stands in an ofi-nor
mal position corresponding to an idle selector
switch in said selected group, means for render
ing said Fast-named means inoperative in the
15 event the selector switch in said selected group
and corresponding to said one position of said
stepping switch is idle, means operative when an
idle selector switch in said selected group is
found for connecting said incoming line through
20 to said idle selector switch, and means operative
when said idle selector switch is found for re
storing said stepping switch to its normal posi
tion
19. In a signalling system, a plurality of lines,
25 an automatic switch having access to said lines,
said switch comprising a stepping switch having
a normal position and a plurality of off-normal
positions, each of said olf-normal positions cor
responding to a group of said lines and to a par
30 ticular line in each group, and means including
means responsive to successive series of received
impulses for repeatedly operating said stepping
switch between its normal position and one or
more of its off-normal positions to select a par
ticular group of lines and a particular line in the
selected group of lines.
20. In a signalling system, a plurality of lines,
an automatic switch having access to said lines,
said switch comprising a stepping switch having
a normal position and a plurality of oil-normal
positions, each of said oiî-normal positions cor
responding to a group of said lines and to a par
ticular line in each group, and means including
means responsive to successive series of received
impulses for repeatedly operating said stepping
switch between its normal position and one or
more of its off-normal positions to select a par
ticular group of lines and a particular line in the
selected group of lines, said last-named means
being operative immediately following the selec
tion of said particular line to restore said step
ping switch to its normal position.
21. In a signalling system, a plurality of lines,
an automatic switch having access to said lines,
said switch comprising
a normal position and
positions, each of said
responding to a group
a stepping switch having
a plurality of oli-normal
oil-normal positions cor
of said plurality of lines
and to a particular line in each group, means
including means responsive to one predetermined
series of received impulses for operating said
,stepping switch to one of said oil-normal posi
tions to select a particular group of said lines,
and means operative following the selection of
predetermined series of impulses to reoperate
said stepping switch to one of its onf-normal po
sitions thereby to select a particular line in said
selected group of lines, and means automatically 15
operative immediately following the selection of
said line for again restoring said stepping switch
to normal.
23. An automatic switch comprising a plural
ity of contact sets, common means for moving
said plurality of contact sets from one position
to a second position, a first additional contact
set, means for moving said nrst additional con
tact set from one position to a second position,
a second additional contact set, means for mov
ing said second additional contact set from one
position to a second position, said contact sets
being so arranged relative to each other that
one contact set of said plurality of contact sets
engages said ilrst additional contact set when
both of these contact sets are moved to their
respective second positions and that another con
tact set of said plurality of contact sets engages
said second additional contact set when both of
these contact sets are moved to their respective
second positions, and means operable in response
to the movements of said plurality of contacts
and one of said additional contact sets to their
respective second positions for preventing the
movement of the other of said additional con
tact sets to its second position.
24. An automatic switch comprising a plural
ity of contact sets, common means operative to
move said plurality of contact sets from one
position to a second position, a first additional
contact set, a first additional means operative
to move said ilrst additional contact set from
one position to a second position. a second addi- -
tional contact set, a second additional means op
erative to move said second additional contact
set from one position to a second position, said'
contact sets being so arranged relative to each
other 'that one contact set of said plurality of
contact sets engages said first additional contact
set when both of these contact sets are moved
to their respective second positions 'and that an
other contact set of said plurality of contact sets
engages said second additional contact set when
both of these contact sets are moved to their re
spective second positions, and means operable
after the operation of said common means and
in response to the operation of one of said addi
tional means for preventing the operation of the
other of said additional means.
25. An automatic switch comprising a plural
ity of contact sets, common means operative to
move said plurality of contact sets from one po
said group of lines for returning said stepping
switch to its normal position, said first-named
means being thereafter responsive to a second
predetermined series of impulses to reoperate sition to a second position, a ñrst additional con
said stepping switch to one of its olf-normal po
tact set, means including a ilrst magnet oper
sitions to select- a particular line in said selected ative to move said ilrst additional contact set
70
group of lines.
from one position to a second position, a second
22. In a signalling system a plurality of lines, additional contact set, means including a second
an automatic switch having access to said lines, magnet operative to move said second additional
said switch comprising a. stepping switch having contact set from one position to a second posi
75 a normal position and a plurality of olf-normal tion, said contact sets being so arranged relative 7a
15
2,137,517
to each other that one contact set of said plu
rality of contact sets engages the first additional
contact set when both of these contact sets are
moved to their respective second positions and
that another contact set of said plurality of con
tact sets engages said second additional contact
- set when both of these contact sets are moved
to their respective second positions, circuits for
energizing said magnets, and means operable
10 after the operation of said common means and
in response to the operation of one of said mag
nets for controlling the energizing circuit of the
other of said magnets to prevent the operation
thereof.
26. An automatic switch comprising a plural
15
ity of contact sets, common means operative to
move said plurality of contact sets from one po
sition to a second position, a ñrst additional con
tact set, means including a first magnet oper
20 ative to movesaid first additional contact set
from one position to a second position, a second
additional contact set, means including a sec
ond magnet operative to move said second addi
tional contact set from one position to a second
25 position, said contact sets being so arranged rela
tive to each other that one contact set of said
' plurality of contact sets engages the ñrst addi-l
tional contact set when both of these contact sets
are moved to their respective second positions
30 and that another contact set of said plurality
of contact sets engages said second additional
contact set when both of these contact sets are
means responsive to the operation of said se
lected one of said additional means for prevent
ing the operation of the other of said additional
_
means.
28. In , a
signalling
system,
an
automatic
switch including a group of contact sets, an in
coming line connected to each contact set of
said group, a plurality of additional contact sets,
outgoing lines individually connected to said ad
ditional contact sets, common actuating means
operative to move the contact sets of said group
from one position to a second position, actuating
means individually associated with each of said
additional contact sets for moving the corre
sponding additional lcontact set from one posi 15
tion to a second position, said contact sets being
so arranged relative to each other that one con
tact set of said group engages a corresponding
one of said additional contact sets when both of
these contact sets are moved to their respective 20
second positions, impulse responsive means for
operating -said common actuating means, testing
means responsive to the operation oi said com
mon actuating means for selecting an idle one
of said outgoing lines, and means responsive to 25
the selection of an idle one of said outgoing lines
by said testing means for operating'said actuat
ing means individually associated with the one
of said additional. contact sets connected to the
selected outgoing line..
30
29. In a signalling system, an automatic switch
including a group of movable„contact sets, an
moved to their respective second positions, cir
incoming line connected to each contact set of
cuits for energizing said magnets, and means op
erable after the operation of said common means
and in response to the operation of one of said
said group, a plurality of additional movable con
magnets for interrupting the energizing circuit
of the other of said magnets to prevent the op
eration thereof.
27. An automatic switch comprising a plural
ity of contact sets, common means operative to
move said plurality of contact sets from one po
sition to a second position, a first additional con
tact set, a ñrst additional means operative to
45 move said ñrst additional contact set from one
position to a second position, a second additional
contact set, a second additional means operative
to move said second additional contact set from
one position to a second position, said contact
sets being so arranged relative to each other that
one contact set of said plurality of contact sets
engages said first additional contact» set when
both of these contact sets are moved to their
tact sets, outgoing lines individually connected 35
to said additional contact sets, test contact sets
individually associated with said additional con
tact sets, testing circuits individually connected
to said test contact sets, common actuating
means operative to move the contact sets of said 40
group from one position to a second position,
actuating means individually associated with
each of said additional contact sets for moving
the corresponding additional contact set from
one position to a second position, said contact 45
sets being so arranged relative to each other that
the contact sets of said group engage said test
contact sets individually associated therewith
when the contact sets of said group are moved
to their second positions and that one contact 50
set of said group engages one of said additional
contact sets when both of these contact sets are
moved to their respective second positions, im
pulse responsive means for operating said com
mon actuating means, testing means including
said testing circuits for selecting an idle one of
said outgoing lines, and means responsive to the
selection‘of an idle one of said outgoing lines by
said testing means for operating said actuating
means individually associated with the one of
said additional contact sets connected to the se
respective second positions and that another
contact set of said plurality of contact sets en
gages said second additional contact set when
both of these contact sets are moved to their
respective second positions, a stepping switch,
impulse responsive means for causing the oper
ation of said stepping switch to predetermined
positions, means including said stepping switch
for successively operating said common means ’ lected idle- outgoing line.
and a selected one oi said additional means, and
JOHN WICKS.
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