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Патент USA US2410520

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Nov. 5, 1946.
Q
J_ E, QSTLINE‘
'
TELEPHONE
2,410,520
SYSTEM
‘
Filed July 26, 194;
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‘JOHN aosrum:
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ATTORNEYS
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Patented Nov. 5., 1946"
I _
2.410.520
ST
2,410,520
TELEPHONE SYSTEM
John Ellis Ostline, Chicago, 111., assignor to Auto
matic Electric Laboratories, lino, a corporation‘
‘of Delaware
Application July 26, 1941, Serial ‘No. 404,103
6 Glaims. > (Cl. 179-85)
l
2
The present invention relates to telephone sys
tems and more particularly to improved arrange-.
adapted for use in the party station identifying
arrangement of a telephone ‘system of the type
ments for identifying calling stations on party
noted.
lines in automatic telephone systems of themeas
ured service type.
_
v I
Y
.
r
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—
A furtherobject of the invention isto provide
an improved calling device which is of simple
The principal object of the inventionis to pro
vide an improved arrangement for identifying
and compact construction and which is econom
ical to manufacture and thoroughly reliable in
calling stations on party lines in an automatic
operation.
telephone system of the general type disclosed
in U. S. Patent No. 12,013,171, Edward S. Peterson,
granted September 3, 1935.
In the automatic telephone system disclosed in
the above-mentioned Peterson patent; an ar
rangement is provided for identifying the partic
-
K
-
Further features of the invention'_min t0
the particular arrangementm? the mechanical
elements of the calling device and of the circuit
elements of the telephone system, ‘whereby the .
above-outlined
and
additional
attained.
-
features
are '
-
V15 The novel features believed to be characteris
tic of the invention ‘are set forth with particu
ing the individually associated register for meter
ing purposes. which arrangement is selectively
larity in theappended claims. The invention, '
both as to its organization and method of' oper
governed by the calling devices *or dials at the
ation, together with further objects and advan
various stations on the associated party line.
,More. particularly, in this system, the switching 20v tages thereof, will‘best be "understood by refer- _
‘ ular calling station one party line and for select
apparatusis so connected and arranged that the
preliminary digit “11" must be transmitted or
‘dialed prior ‘to the directory number oi’ the
desired or called station in order to e?ect opera
tion thereof to extend a'call from any station on '
the party line. While this system is entirely sat
isfactory in operation, it requires the dialing of
ence to the following speci?cation taken in con
' nection with the accompanying drawings, in
which Fig. 1 is a, rear view of a;
In: device
embodying the present invention: Fig. 2 is a side
elevationai view of‘the calling device own in
Fig. 1; and. Figs. 3 and 4 taken together illustrate
diagrammatically a. telephone system embodying
the present invention.
the preliminary digit “11" incident to the exten
Referring now more particularly to Figs. 1 and .
sion of a call from any station on the party line,
resulting in slight inconvenience to the \ sub 80 2 of the drawings, there is shown a calling-device
it of the ?nger dial type and of the general con
scriber at the calling party station.
\ ’
‘
struction and arrangement of that. disclo
in
Accordingly, it is another object of the inven
tion to provide in a telephone system of the type
U. ISJPatent No. 1,642,822, Herbert F. Obergiell.
granted September 20, 1927, which has been
noted an improved arrangement for ident'i ing
I _ the particular calling station on a party
ine,
modified to embody the present invention.
which arrangement requires the performance of
‘More particularly, the calling device Become
no specialoperation or dialing of a preliminary
prises a casing ii,‘ a rotatable arbor it, ‘nigger -
digit on the part of the subscriber at the calling
wheel or dial it secured to an enlarged
s it ' provided on the outer end of thearbor i2; and a
party station.‘
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Y
'
Another object of the invention is to provide in 40 cooperating ?nger stop it. The ~er ‘wheel it“
a telephone system of the type noted an improved
has ten spaced-apart openings therein, not shown.
arrangement for identifying the particular cell
which ‘are adapted to receive the ?nger oi‘ the
user and which respectively correspond to the
ing station on a party line, which is governed by
the calling device at the calling party station
' digits 1 to 0,,inclusive.
Also, a coil spég itis'
. incident to operation thereof to transmit the
directory number of the-desired or called station.
provided
the arborinii;surrounding
the inner end
relation
of thewith
coil spring be
A further object of the invention is to provide . ' ing secured to the ‘casing ii and the outer end.
thereof being secured to the outer end of the‘
in a telephone system of the type noted an im»
proved arrangement for identifying the particu
arbor it. The rear wall oi" the casing it
n
a bracket ii, the bracket being secured in place
lar calling station on a party line, which is selec
tlvely governed by improved calling devices dis
by two spaced-apart. screws it. The bracket it
posed at the various stations on the associated‘ ‘ carries a set of impulse springs it and it, a set of
shunt springs 2t, 22 ‘and it, and a set of o
party line.
I
A. further object 01’ the invention is to provide . springs 2t and 25.
an. ‘improved calling ' device which is' specially 55 ~zTheinner‘ends oi the im
springs it and .
2,410,520
3
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" 23 are suitablyv insulated from each other and '
from the bracket I1 by a plurality of strips of
insulating material 23 and are retained in
clamped position by two screws .21. Also, the im
pulse springs I3 and 23 are respectively provided
with electrical terminals 28 and 23. Similarly,
the inner ends of the-shunt springs 2|, 22 and 23
4
digit to be transmitted and rotates the ?nger
wheel I3 in a counterclockwise direction, as
viewed in Fig. 1; until his ?nger engages the ?n
ger stop I5 and then releases the finger wheel
I3. When the ?nger wheel I3 and the arbor I2 .
secured thereto are rotated in a counterclockwise‘
direction, the coil spring I6 is wound and ‘the
mechanism housed in the casing I I is set to trans
_ are suitably insulated from each other and from
mit the digit thus registered. More particularly,
when the arbor I2 is rotated in a counterclockwise
direction the control arm 43 carried by the ?x
ture 43 disengages the control member 43, there
by to allow the impulse springs“ and‘23 to move,
while maintaining engagement therebetween, to
the bracket I1 by a plurality of strips or insu
lating material 33 and are retained in clamped
position by two screws. 3 I . Also, the shunt springs
2i, 22 and 23 are respectively provided with
‘_ electrical terminals 32, 33 and 34. Finally, the
inner ends of the cam springs 24 and 25 are
suitably insulated from each other and from the
bracket I1 by certain of the-strips of insulating
material 33 and are retained in clamped position
by the two screws 3i. The electrical terminal
' ward and into cooperating relationship'with re
spect to the impulse cam 43; however, the im
pulse spindle 48 and the impulse cam 43 carried
thereby are not rotated prior to the release of the
?nger wheel I3. Also, when the arbor I2 is ro
tated in the counterclockwise direction the‘con
trol arm 44 carried by the ?xture 43 disengages
33 is common to the shunt spring 22 and the cam .
spring 24; while the cam spring 26 is provided
with an electrical terminal 35.
The cam spring 24 carries two spaced-apart
the control member 41, whereby the shunt spring
23 is moved into engagement with the shunt
spring 22 and forces the shunt spring 22 into
engagement with the shunt spring 2i due to the
inherent resiliency of the shunt spring 23, as pre
viously noted. Finally, as the arbor I2 is rotated
_ and inwardly directed tabs 36 intermediate its‘
en'ds which support a pivot pin 31 upon which a
pawl 38 is pivotaily mounted. The outer end of
the pawl 33 is biased in a counterclockwise di
rection about the pivot pin 31, as viewed in ‘Fig.
1, by a leaf spring 33, the outer end of the leaf
in the counterclockwise direction, the projections
spring 33 extending into a recess provided in
43 carried on the periphery [of the cam 4I ride
the pawl 33’and the inner end of the leaf spring 80 over the outer end of the pawl 33 and therebe
' 33 being clamped to the bracket II by the screws .
hind. More speci?cally, when one of the projec
tions 45 carried by the periphery of the cam 4i
3 I . The arbor I2 carries a ?xture 43 adjacent the
outer end thereof and an annular insulating cam
engages‘the outer- end or the pawl 33, the pawl
33 is pivoted about the pivot pin 31. in a clock
‘H on the extreme outer end thereof, the ?xture
wise direction, ~as viewed in Fig. 1, against the
43 and the cam 4I being retained in place by a
screw 42. The ?xture 431s provided with snout
bias of the leaf spring 33; however, the cam
wardly extending impulse spring control arm 43
spring 24 is not moved into engagement with the
and an outwardly extending shunt spring control
cam spring 2-3 due to this action 02 the pawl 38.
arm 44, the arms 43 and 44 being arranged in
When the projection 45 carried on the periphery
radially spaced-apart relation. The peripheral 40 of the cam 4i rides over the outer end of the
pawl38 and therebehind the leaf spring 33 piv
edge of the cam 4| carries one, two or three pro
jections 43, three projections 43 being illustrated
in the present example. The impulse spring 23
ots the pawl 38. in the counterclockwise direction ,
" carries an insulating'control member 48 which co
operates with the control arm 43; and the shunt
spring 23 carries an insulating control member
_41 which cooperates with the control arm 44.
Further, the calling device 43 comprises mech
anism, not shown, housed in the casing II, which
includes a gear trainv and/a connected impulse
spindle 43 extending through an opening‘ Ila
provided in the rear "wall of the casing II. The
outer end oi’v the impulse spindle 48 carries an im
pulse cam 43 which cooperates with the extreme
outer end of the impulse spring I3.
'
When the ?nger dial I3 occupies its normal
position the arbor I2 is biased in aclockwise di
rection, as viewed in Fig. 1, by the coil spring I8;
i.
about the pivot pin 31 back into its normal po
sition. without moving the cam' spring 24 into
engagement with the cam springs".
At this timeI when the ?nger-wheel I3 is re
leased it is vreturned in the clockwise direction, ’
as viewed in Fig. l, by the coil spring I3 back into
its normal. position, whereupon the mechanism
‘housed in the casing _.I I rotates the impulse spin
dle 43‘ an appropriate amount corresponding to
the digit registered. At this time, the outer end
vof the impulse spring I8 is arranged in coop
crating relationship with respect to the impulse
55 cam 43 due to the disengagement between the
control arm 43 carried by the ?xture 43 and the
controlmembe'r 43 carried by the impulse spring
23;' accordingly, each time an end of the cam 43
engages‘the outer end oi.’ the impulse spring I3
IIO the impulse spring I3 is moved out of engage-'
; ment with the impulse spring 23. Hence, the op
whereby the control arm 43 carried by the ?xture
43 engages the control member“ in order to
urge the impulse springs I13 and 23 into engage
posite ends of the impulse cam 43 alternately en
ment, and the control arm 44 carried by the ?x
ture 43 engages the control member 41 in order
gage and disengage the outer end of the impulse
to urge the shunt springs 2 I, 22 and 23 into disen
. spring I3, thereby alternately to move the im
gagement. At this point it is noted that the 65 pulse spring I3 into disengagement and to per
mit it to be returned into engagement with the
shunt spring 23 'is normally biased toward the
impulse spring 23, whereby the calling device I3
shunt spring 22 due to its own resiliency. Also,
the projections 45 carried by the cam M are dis
transmits a number of impulses by way of the
posed forwardly in a clockwise direction with re
spect to the outer end of the pawl 33; and the
pawl 38 is biased in a connterclockwise direction
about the pivot pin 31 by the leaf spring 33.
In order to operate the calling device I3, the
. impulse springs I3 and 23 corresponding to the
digit registered.
.
-
- Also, when the ?nger wheel I3 is released the
cam 4I carried von the outer end of the arbor I2
' is rotated in a clockwise direction‘, as viewed in
Fig. 1,‘.whereby the projections.“ carried on the
user inserts his ?nger into one of the holes pro;
vided in the ?nger wheel I3 corresponding to the 75 periphery of the cam 4i alternately engage and
o
2,410,520
'5
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. disengage the outer end of the pawl 38. More
particularly, when one of the projections 48 car
ried on the periphery of the cam“ engages the
2i, 22 and 23 are operated into engagement at
all times when the ‘?nger wheel I3 is away from
.its normal position; while the ?nger wheel 13 must
be moved a predetermined distance from its‘
rear surface ofthe outer end of the pawl "the '
pawl 38 is urged in a counterclockwise direction ‘5 normal position in ‘order to cause the ?rst digit 1
to be eilectively registered in the mechanism
about the pivot pin 31, as viewed in .Fig. 1; how
housed ‘in the casing ll. Also, the cooperation
ever, movement of the pawl 88 in the~counter
between the elements mentioned above ‘permits
clockwise direction about the pivot pin 31 is
control of the cam springs 26 and 25 to send one
blocked due to the arrangement of the pivotal
mounting of the pawl 38 upon the cam spring 10 impulse in excess of the'number of impulses in
the digit registered in the mechanism housed in
24. Accordingly, at this time, the pawl 38- is
the casing it when the digits 1 and 2 are 'regis- , '
forced outwardly and downwardly away from the
tered therein. By way of illustration, it is'pointed
engaged‘projection 135 carried on the periphery of
out that, in the present embodiment of the call
the cam iii in- order ‘to force the cam spring 23
into engagement with the cam spring 25. Sub is ing device it, when the digit 2 is registered 'in'
the mechanism housed in the casing ii, in order
sequently, when the projection 35 carried on the '
periphery of the cam 4| rides over the outer ends
to cause the impulse springs i9 and 20‘ to be ‘
of the pawl 38, the pawl 38 and the cam spring - controlled to transmit two impulses. the cam
springs 2d and 25 are controlled to transmit three
j 24 are returned to their normal positions due to
the inherent resiliency, of the’ cam spring 2d, 2-0 impulses, three projections at being provided on
the periphery of the cam dl. Further, it will be
whereby the cam spring 2% is moved into disen
understoodthat the number of projections pro- i
gagement with the cam spring 25. j Accordingly,
as the arbor i2 is rotated in the'clockwise direc ~ vided on the cam t5 may be varied in order to ob
tain selective control-of the associated switch
tion back into its normal position theprojectlons
65 on the periphery of the cam 4! cause the cam
ing apparatus; however,‘ in the present embodi
springs 26 and 25. tooperate into engagement
ber of impulses byway of the ‘cam springs 26 and
ment it is contemplated that the ‘cam M will have
no projections as thereon or 1,‘ 2 or 3 projec
tions thereon," thereby rendering the calling de— '
vice l0 capable of four modi?cations, in‘an ob
25 corresponding to the number of projections as
vvious'manner', as will be explained more fully in '
and disengagement a like number of times, '
whereby the calling-device iii transmits a num
conjunction with the telephone system in which
the calling device it is incorporated.
Finally it is noted that .the cooperation be
tween the elements mentioned above is such that
- its normal position, the control arm is carried
by the ?xture it engages the control member it 35 the impulses transmitted by way of the cam
springs 21% and 25 and the impulses'transmitted
carried by the ‘impulse spring 20 and forces the
by the impulse springs l9 and 2d are transmitted
impulse spring 20 away from the impulse cam
alternatively. In the present example, when any
59, whereby the outer end of the impulse spring
digit between ,Z'and 0 is dialed the camjsprings
‘i9 is forced out of cooperating relationship with
respect to ‘the impulse cam'tQ in order to prevent at 2d and 25 operate to transmit their ?rst impulse; '
then the impulse springs 19 and 2t operate to
any further operation of the impulse cam ts
transmit their ?rst impulse; then the cam springs
from operating the impulse spring it. Ultimate
ly. when the arbor ‘I2 is rotated-in the clockwise \ 2t and 25 operate to transmit their'second im
pulse; then the impulse springs iii and 2t oper
direction into its ?nal normal position, the con
provided on the periphery of the cam ti.
Just prior to the time the arbor i2 is rotated
in the clockwise direction completely back into
' trol arm M carried ‘by the ?xture 68 engages the 45 ate to transmit their second impulse; and then
control member 431 carried by the shunt .spring
23; whereby the shunt ‘spring 23 is forced out
of engagement with the shunt spring 22 and the
' shunt spring 22 is forced out of engagement with
the cam springs Eli and 25 operate to transmit
their third impulse. Thereafter, the impulse
springs is and 2d are operated to transmit their
third, etc., impulses in the event the digit dialed
the shunt‘ spring 2!, due to ‘its inherent resil so is 3, etc.; however, the cam springs 2d and 25 are
not operated to transmit further impulses.
'
iency. Also, when the arbor i2 has'been rotated
in the clockwise direction to its ?nal normal po
sition, the last projection d5 carried on the
periphery of the cam 61 has operated the as
Also it is pointed out, that the selective con
trol of the cam springs 24 and 25 may be eilected
merely by suitably adjusting the normal position
' "sociated pawl 38, in the manner explained above. 55 of the cam ti upon the outer end of the arbor
.At this point, it is noted that the arrange
ment of the control arm d3 carried by the ?x
82 with reference to the pawl 8t, instead of sub
stituting di?erent cams iii having different num
bers of projections ti on the peripheries thereof,
ture lit and the control member it carried by
as explained above.'
_
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7
the impulse spring 20 is so coordinated with‘re
spect to the mechanism housed in the casing ii 00 Referring now more particularly to Figs. 3 and
4 of the drawings, ‘the telephone system there
that all of the digits registered in the mechanism
illustrated comprises an exchange having a plu
' have been transmitted by way .of the impulse
rality of individual subscriber lines, not shown,
springs i9 and 2d a slight time interval prior to
terminating thereat, and a plurality of party sub
the ‘?nal return of the ?nger wheel is and the
connected arbor it into their normal positions. 65 scriber lines,including the party subscriber lines .
tilt and 8%, terminating thereat, and provided
Also, it is noted that the shunt springs 28, 22 and
with switching apparatus. Each of the party sub
23 are moved into disengagement only upon the
scriber lines has four ‘party subscriber substa
?nal return of the ?nger wheel‘ it and the con‘
tions individually associated therewith; the party
nected arbor l2 into their normal positions; while
the last projection d5 provided on the periphery 70 subscriber substations till, 302, the and 3% be
ing. individually associated with the party sub
of the cam dl operates the associated pawl 38
scriber line lit, and the party subscriber sub
just prior to the ?nal return of the ?nger wheel
l3 and the connected arbor i2 into their normal
stations Whtw, tit and 314 being individually
associated with the party subscriber line are.
positions. The cooperation between the elements
mentioned positively insures that the cam springs 75 Each party subscriber substation comprises sub
a, 2,410,020
station apparatus, including a harmonic ringer,
stations. More particularly, the meters M305,
the four harmonic ringers at the four party sub
M308, M301 and M308 are respectively indi-,
scriber substations on each party subscriber line
vidually associated with the party subscriber sub
being respectively tuned to 16, 33, 50 and 66 cycle.
stations 30I, 302, 303 and 304; and the meters -
ringing currents. In the present exampie,_the
‘M3I5, M3I6, M3I‘I and M3I8 are respectively
party subscriber substations 3M, 302, 303 and 304
individually associated with the party subscriber
connected to the party subscriber line I30 and
substations 3II, 3I2, 3l3- and 3I4. Finally, the
the party subscriber substations 3i I, 3I2,'3I3 and
exchange comprises a group vof repeaters, includ
3“ connected; to, the party subscriber line I20
ing the repeater 400.
are respectively 16, 33, 50 and 66 cycle substa 10 The apparatus in the exchange is so connected
tions.
and arranged that each of the individual line
Preferably, the substation apparatus provided
at each party subscriber substation is substan
tially identical to that provided at the fourth
party subscriber substation 304 connected to the 16
party subscriber line I30, with the exception of
certain modi?cations in the calling devices:
thereat, as noted more particularly below. The
substation apparatus provided at the fourth party '
switches has access vto the group of regular se
lectors; while each of the party line switches
320, 360, etc., has access to each of the repeaters
400, etc., by way oi incoming trunks, 4‘I0,,etc.,
individual to the repeaters 400, etc.
Each re
peater 400, etc., in the group is directly con
nected by way of an outgoing trunk 480, etc., in
dividual thereto to a corresponding one of the
subscriber substation 304 comprises a harmonic 20 repeater selectors 405, etc., in the associated‘
ringer IN, a transmitter I02, 2. receiver I03, a
group. Each meter switch is ‘individually asso
hook switch SIM, an inductioncoil I0? and a _. ciated with one of the party line switches and
calling device I0, the calling device I0 being
has access to the four meters respectively indi
identical to that disclosed in Figs. 1 and 2 of the
vidually associated with the four party sub
drawings and including a cam 4Iprovided with 25 scriber substations connected to the party sub
three projections 45 on its periphery. The sub
scriber line with which the party line switch is
station apparatus provided at the ?rst, second
and third party subscriber substations 30I, 302
and 303, respectively, is substantially identical
to that provided at the fourth party subscriber
substation 304, except that in‘the calling devices
respectively provided at these party subscriber
substations, the cam 4i comprises no projections
individually associated. By way of example, it is
noted that the‘ meter switch 350 is individually
associated with the party lineswitch 320 and has
30 access to the four meters M305, M306, M301 and
M303 respectively individually associated with
the four party subscriber substations SM, 302,
303 and 304 connected to the party subscriber line
I30 with which the party line ‘switch 320 is indi
_ 45, one projection 45 and two projections 45. In
. view of the fact that the calling devices provided 35
. at the ?rst party subscriber substations 30I, 3| I,
etc., each comprise a cam 4i provided with no
vidually associated.
,
Each of the regular selectors in the group and
each of the repeater selectors in the group have
access to the group of special service selectors, to
vided at each ?rst ‘party subscriber substation
the four groups of party connectors, to the four
may be, of conventional construction and ar 40 groups ofindividual connectors, and to a group
rangement' and of the character of that disclosed
of trunks extending to the manual operator posi
in the previously mentioned Obergfell patent,
tion 0. Each of the individual connectors in each
wherein the cam 4I andthe set of cam springs
of the groups has access to each of the individual
projections 43 thereon, the calling device pro
24 and 25 are eliminated.
‘
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lines; each of the party connectors in
The switching apparatus provided in the ex 45 subscriber
eachoi.’ the groups has access to each of the
change comprises a plurality of individual line
party subscriber lines; and each of the special
switches of conventional ' connection and an
rangement, not shown, individually associated
with the individual subscriber lines, not shown,
and a plurality of party line switches, including 50
service selectors in the group has access to a
group of trunks extending to the toll operator
‘position IIO.
'
'‘
Preferably, each of the individual line switches
the ‘party line switches 320 and 330. individually
is of conventional connection and arrangement;
associated with the party subscriber lines, the
while each of the party line switches is identical
line switches 320 and 330 being respectively in
to the party line switch 320. The party line
dividually associated with the party subscriber
switch 320 comprises a switching mechanism, in—
lines I30 and I20. Also. this switching apparatus 55 cluding a rotary wiper set provided with ?ve
comprises a plurality of meter switches 350,- 310,
wipers'32i, 322, 323, 324 and 325, an associated
etc., individually associated with the party line" contactbank, and a rotary magnet M320 for
switches 320, 330, etc., which are, in turn, indi
driving the wiper set noted. Also, the party
vidually associated with the party subscriber lines
line switch 320 comprises a relay network in
I30, I20, etc. Further, this switching apparatus
cluding a cutoff relay R330 and a line relay R340.
comprises a group of regular selectors, not shown,
Preferably, each of the meter switches is iden
a group of repeater selectors, including the re
tical to the meter switch 350 ‘which comprises
peater selector 400; a group of special service
a switching mechanism including a rotary wiper
selectors, including the special service selector
set provided with a single double-ended wiper
408, four groups of individual connectors, not
‘35I, an associated contact bank, and a rotary
shown, and four groups of party connectors. The
magnet M352 for driving the wiper set noted.
?rst, second, third and fourth groups of party
Also, a set of switch springs S354 is associated ,
connectors respectively include the party con
with the wiper set of the meter switch 380 and
nectors 40I, 402, 403 and 404, which party con
nectors respectively ring a line seized thereby 70 operated, in a manner more fully explained here
inafter.
I
with 16, 33, 50 and 66~cycle ringing currents.
Further, the exchange comprises a manual
Preferably, each of the repeaters is identical
operator position 0; a toll ‘operator position‘ H0,
to the repeater 400 which comprises a relay net
and a plurality nI' ini‘aSili‘ed service meters indi
work, including a digit cutoff relay R4I0, a meter
vidually associated with the party subscriber sub 75 relay R420, a dial relay R430, an answer relay
2,410,030
new, a line relay Run, a hold relay am and _, . gages an associated contact set at each step of
an impedance element l I 5.
,
‘
the party line switch 320. Accordingly, at this
>
Preferably, each of the regulator selectors an
time, the idle or busy condition of the incoming
trunk. terminated by the engaged contact set
each of the repeater selectors 405, etc., are of the
conventional‘ Strowger type; each of- the indi
and extending to one of the repeaters is tested.
vidual connectors and each of the party connec - ,In the event the last-mentioned trunk extends
to a busy repeater, ground potential appears upon
tors SM, etc., are of the conventional Strowger
type; each of the special service selectors 486, etc., the control conductor thereof andis applied to
is of the conventional drop-back Strowger type;
the control wiper 323 of the wiper set, thereby
and the manual operator position a and ‘the toll 10 to ‘complete a path, including the contacts 385,
operator position H0 comprise conventional op
3H,v and 3&2, for, short-circuiting the winding of
erator position equipment. "
- _
the cutoff relay R330, and to complete a low re
In accordance with the trunking plan incor-.
sistance circuit, including the contacts 335, 8M
porated in the telephone system, both the regu
and 321, for energizing the'ro'tary magnet M326.
lator selectors and the ‘repeater selectors have 15 When the rotary magnet M326 is thus‘energized
it operates, thereby-to condition the wiper set to
access to the group of special service selectors .
in, the ?rst level of the associated contact banks,
be driven one step in the rotary direction and
.to interrupt, at the contacts 321, the previously
to the first, second, third and fourth groups of
party connectors in the respective second, third, , ‘traced circuit for energizing the rotary magnet
fourth and ?fth levels or‘ the associated contact
M328. The rotary magnet M325 then restores,
banks, to the four groups of individual connec
thereby to drive the ‘wiper set one step in the
' tors in the sixth, seventh, eighth and ninth levels
rotary direction and torecomplete, at the con
of the associated contact banks, and to the group ' tacts 32?, the previously mentioned circuit, in
of trunks extending to the manual operator po
eluding‘ the test wiper 323 of the wiper set, for
sition d in the tenth level of the associated con-_ 25 testing the idle or busy condition of the trunk
tact banks.
terminated by the contact set engaged by the
wiper set at this time. On the other hand, in
'
The connection and arrangement of the system will best be understood from a consideration of
the event the wiper set engages a contact set
the following description,. with reference to Figs.
terminating an idle trunk, no ground potential
- 3 and 4 of the drawings, of the operation of the 30 appears upon the control conductor thereof,
apparatus incorporated therein to set up the dif;
whereby the previously traced test circuit, in
cluding the test wiper 328 and the rotary mag
not meet, is not completed. Accordingly, the
ferent connections between the various indie ,
vidual and party subscriber substations.
Considering now the extension of a call from
previously traced low resistance circuit for en
the fourth party subscriber‘ substation tilt, con; 35 ergizing the rotary magnet M326 is not com
nected to the party subscriber line lit, to the
pleted and the previously traced path for short
first party subscriber substation 3“, connected
to the party subscriber line lid, the call is ?rst
. initiated at the fourth party subscriber substa
circuiting the winding of the cutod relay Reed
is not completed. Hence, when operation of the
party line switch 320 is initiated the wiper set
40 is driven a step in the rotary direction onlysin
tion 33% by removing the receiver Hid from its as
sociated switchhook, thereby to operate the hoolr
the event that it engages a contact set tern/‘inst:
ing a busy trunk, in which event the wiper set
switckh Side. When the hook switch sacs is thus
operated there is completed, at the contacts the
is driven step by step in the rotary direction
and the thereof, obvious operative connections
until it engages a contact set terminating an idle
between the transmitter let, the receiver m3 and 45, trunk.
Assuming that the wiper set of the party line
the party subscriber line tilt; whereby a circuit
iscompleted for energizing the winding of the
switch 32% ‘engages the contact set terminating‘
the trunk did extending to the repeater the ‘and
‘line relay Rtlid in the party line switch did in
dividually associated with the party subscriber
that the latter repeater is idle at this time, no
line ltd. The-circuit for energizing the winding 50 ground potential appears upon the control con
of the line relay Rite extends from ground by
way of thescontacts 333, the line conductor (EH32
. of the party subscriber line Still, the primary
_ cluctor (3518 of the trunk did. Accordingly, the
‘ previously traced low resistance circuit, includ»
' ing the control wiper 3%,‘for energizing the row
"winding of the induction coil id‘i, the transmit
ter N2, the contacts ltd of the hook switch Site,
the impulse springs it'and it of the calling
device iii, the line conductor Cid!‘ of the party '
subscriber line Add, the contacts 33! and the
winding of Rdéid to battery.
When thus energized the line relay Ride op 60
erates to complete, at the contacts 382, an obvi
one‘ path for applying ground potential to the’
control conductor Cite of the party subscriber
line iilii in order to'marlr the party subscriber
tary- magnet Middle not completed; and the pre»
viously traced path, including the control wiper
323, for short-circuiting- the winding of the cutoff
relay Rite is not completed. Hence, .at this time,
an obvious circuit, including the contacts 3%
and 327, is completed for energizing in series
the winding of the cutoff relay Rddd and the ~
rotary magnet Mdid. When this series circuit
is completed the cutoff relay Rite operates;
however, the rotary magnet M3228 does not oper=
ate due to the high series resistance of the winding
‘ line ltd as busy to the party connector switches 65 of the cutoff relay R388.‘ 1
Upon operating, the cutoff relay Redd inter»
rupts, at the contacts 3.36 ‘and $33, the previously
traced circuit for energizing the winding of the
"line relay Rttiii, thereby to cause the latter relay
wiper set and the rotary magnet Mitt; and 70 to restore shortly thereafter, the line relay Rdtd
being of the s'lcw-to-release type. ' Also, the cut=
completes, at‘the contacts 352’, an obvious ground
o?' relay Rees completes, at the contacts 332 and
connection to one‘terminal of‘the winding of
the cutoii' relay R339. At this point it is noted _ 3343, a circuit, for energizing in series the upper
winding of the line relay Redd andthe upper and
that the party line switch 328 is of the non
homing type, whereby the‘ wiper set thereof en 75. lower windings of the meter relay Rim)‘ in the
tilt, etc., having access thereto. Also, the line
relay Redd completes, at the contacts 3530, an ob
vious test connection, including the contacts 3%
and 3277, between the control wiper 923 of the
2,410,620
11
-
repeater 400, this circuit extending from ground _
by way or the contacts 442-, the lower winding of
R420, the line conductor C412 of the trunk 410,
the line wiper 322, the contacts 334, the line con-V
ductor CI32~ of the party subscriber line I30,
the primary winding of the induction coil I01, the
transmitter I02, the contacts I05 oi the hook
switch SI04, the impulse springs I9 and 20 of
the calling device I0, theline conductor CI3I of
the party subscriber line I30, the contacts 332,
,-
12
>
interrupt, at the contacts 342, the original oper
ating circuit for energizing in series the winding
of the. cutoff relay R330 and the rotary magnet
M325. Also, it is noted that at this time ground
potential appearing upon the control conductor
C413 of the trunk 410 is returned by way of the
control wiper 323 and the contacts 330 to the
control conductor CI33 of the party subscriber
line I30, thereby to retain the party subscriber
10 line I30 marked as busy to the party connectors '
the line wiper 32I, the line conductor C4'lI of the
trunk 4‘l0, theupper winding of R420 and the
upper winding of R450 to battery. When this
series circuit is completed the line relay R450
operates; however, the meter relay R420 does 15
40_I, etc., having access thereto.
)
Also, it is noted that when the previously traced
loop circuit between the‘ repeater, 400. and the re
peater selector 405 is completed, the left-hand
winding of the answer relay R440 is energized;
however, the latter relay does not operate at this
time as the right-hand winding thereof is also
energized by way of an obvious circuit, includ
, between the control wiper 32,3 and the rotary
ing the contacts 402, which was completed in
I magnet M326; and completes,’ at the contacts 336, 20 cident tothe operation of the hold relay R460.
an obvious path, including the contacts 342 and
When both. the left-hand and ‘the right-hand
the control wiper 323,-for applying ground poten
windings of the answer relay R440 are thus en
tial to the control conductor C413 of the‘ trunk
ergized this relay does not operate, as it is of the
410,_thereby to mark the trunk 410 as busy to
polarized type. Accordingly, at this time an op-\
the other party line switches having access there 25 erative connection is completed between; the
not operate as it is of the differential type.
Further, the cutoff relay R330 interrupts, at
the contacts 335, the previously traced test circuit
to; Further, the cutoff‘ relay R330_interrupts,
' fourth party subscriber substation 304, connected
at the. contacts ‘331, a point in a homing circuit
to the party subscriber line I30, and the repeater
traced hereinafter for energizing the rotary mag- '
400 by way oi’_ the party subscriber line I30, the
net M352 of the meter switch 350; prepares, at ' ' party line switch 320 and the trunk 410; also, the
the contacts 338, a point inan operating circuit 30 repeater‘400 is operatively ,connected to the re
traced hereinafter for energizing the rotary mag
net M352; and prepares, at the contacts 339, a
circuit traced hereinafter for operating the meter
M300 individually associated with the fourth
party subscriber substation 304 connected to the 35
party subscriber line I30.
-
.
Upon operating, the line relay R450 in the re
peater 400 completes, at the contacts 452, an
obvious circuit for energizing the winding of the
hold relay R460, thereby to cause the latter relay
to operate. Upon operating, the hold relay R430
completes, at the contacts 46I, a loop‘circuit ex- '
tending between the repeater 400 and the re
peater selector 405 individually associated with
the repeater 400. This loop circuit extends from
the line conductor C48I of the trunk 400 by way
of the contacts 40I, the impedance 4I5, the
left-hand winding of the answer relay R440 and,
the contacts 45I to the line conductor C482 01’
the trunk 080, the line conductors C43I and -
C402 of the trunk 430 being connected by way
of the apparatus in the repeater selector 405 re
spectively to battery and ground potentials,
' whereby the repeater selector 405 is conditioned
peater selector 406 by way of the trunk 480. Fur
ther, dial tone current is returned from the re
peater selector 40.5 by way of the above-traced
connection to the receiver I03 at the fourth party
subscriber substation 304 in order to indicate to
the subscriber thereat that he may proceed to dial
the ?rst digit of the directory number.
The subscriber at the calling fourth party sub
scriber'substation 304 then proceeds to dial the
?rst digit of the directory number of the called
?rst party subscriber ‘substation M I, the directory
_ number of. the called ?rst party subscriber sub
station 3II being 2m, such, for example, as 234.
When the subscriber at the calling fourth party
subscriber substation 304 pulls the ?nger wheel
of the calling device I0 in accordance with the
digit 2, the shunt springs 2!, 22 and 23 are oper
ated into engagement; the mechanism housed in
the casing of the calling device I0 registers the
digit 2; and the cam 4I‘is rotated in a counter
clockwise direction, 'as viewed in Fig. 3, in order _
to move the three projections 45 carried on the
periphery thereof behind the associated pawl 38,
in the'manner previously explained. When the
to be responsive to a digit transmitted thereto. " shunt springs 2|, 22 and 23 are operated into en
When the repeater selector 405 is thus condi
gagement, an obvious path is completed for short
tioned to be responsive to a digit transmitted
circuiting both the transmitter I02 and the re
thereto, ground potential therein is applied to the
ceiver I03, in accordance with conventional prac
control conductor C483 of the trunk 480; and is
tice; and a direct dialing bridge, including the
returned therefrom by way of the control conduc 60 primary winding of the induction coil M1, the
tor C413 of the trunk 410 to the control wiper 323.
shunt springs 23' and 22 and the impulse springs
This application of ground potential tothe control
I9 and 20. is completed between the line con
wiper 323 completes an obvious holding circuit
ductors CI32 and CI3I of the party subscriber
for energizing in series the winding of the cutoff "
relay R330 and the rotary magnet M320 in the
party line switch 320. At ‘this point, it is noted
that .the above-mentioned holding circuit is‘ com
pleted prior to the restoration of the line relay R340 in order to prevent the release of the party
line switch 320. Shortly after the above-men
tioned holding circuit is completed the line relay
line I30.
'
The subscriber at the calling fourth party sub
scriber substation 304 then ‘releases the ?nger
wheel of the calling device i0, whereby the call
ing device I0 operates, in the manner previously
explained, in coniunctionwith Figs. 1 and 2 of the
drawings. More particularly, the cam springs
mentioned test circuit, including the control»
24 and '20 operate to transmit a ?rst ground im
pulse over the line conductors CI3I and CI32_ of
the party subscriber line I30‘ prior to the opera
tion of the impulse springs. I0 and 20 to interrupt
wiper 323 andlthe rotary magnet M028; and t0
the previously traced loop circuit extending be- .
R340 restores in order tointerrupt, at ‘the con
tacts 3“, a further point in ‘the previously
2,410,680
,
l3
.
I
tween the calling fourth party subscriber sub
station 305 and the repeater ‘W, in the manner
previously explained. The path for applying
ground potential to the line conductor C13! ex
tends from ground by way of the cam springs 25
and 2d, the shunt spring 22 and the impulse
springs it and 20 to the line conductor Cl3i;'
while the path for applying ground potential to '
' the line conductor (‘.182 extends from ground by
"14
‘ circuit for energizing thelower and upper wind
ings of the meter relay R420 and the upper wind
ing of‘the line relay R458 is recompleted, there
by to cause the meter relay R428 to retain its re
stored position and to cause the line relay R450
to reoperate. Upon restoring, the line relay R650
interrupts, at the- contacts 452, the‘ previously
mentioned circuit for
energizing the winding of
_
-the hold relay R460; however, the latter relay
way of the cam springs 25 and 25, the shunt 10 does not restore at this time as it is of the slow-' '
to-release type. Also, the line relay R450 com
springs 22 and 23 and the primary winding of
pletes, at the contacts 453, anobvious circuit, in
theinduction coil I01 to the line conductor C132.
cluding the contacts $63; for energizing the wind
The application of ground potential to the line
ing of the dial relay R430, thereby to cause the
conductor Cltl oi the party subscriberline I30
completes an alternative “circuit substantially 15 latter relay to operate. Upon operating, the dial
relay R430 completes, at the contacts til, an ob
identical to that previously traced for energiz
vious path for short-circuiting the‘ impedance ele
ing in series the upper winding of the meter relay
R428 and the upper winding of the line relay
ment at [5 and the left-hand winding of the answer
relay Rttt, thereby to provide a low resistance
R65!) in the repeater eon; while the application
of ground potential to the line conductor (SE32 of .20 bridge across the line conductors Ct?i and>C4i82
of the trunk $80 and positively to prevent opera
the party subscriber line I30 completes a path,
tion of they answer relayRttO incident to switch
including the contacts 336, the line wiper 322,
the line conductor CW2 of the trunk M0 and the '
contacts ear for short-circuiting the lower wind
ing of the meter relay R420. Accordingly, the
line relay Re?t remains in its operated position
ing surges impressed upon the trunk 480 incident ,
to 'operationof the repeater vselector 505. - Also,
the dial relay R630 completes, at the contacts E33,
an obvious circuit for energizing the upper wind
ing of the digit cutoff relay Rtlt. When the up
per winding of the digit cutoff relay Rtit is thus
energized this relay takes a ?rst step in order to
‘Upon operating, the meter relay Rt?d completes, 30 complete, at the contacts M2, an obvious path for
at the contacts can, a circuit, including the‘ con-‘ ' short-circuiting the lower winding: thereof.
tacts it i, the conductor Celt oiithev trunk tit, . When the lower winding of the digit cutoff relay
Rd‘!!! is thus short-circuited' it will not take a
the wiper 82d and the contacts sec, for energiz
second‘ stép to interrupt, at-the contacts M I, a .
ing the magnet Midi of the meter switch 350.
When thus energized the magnet M352 operates 35 prepared point in the previously traced circuit
for energizing the rotary magnet M352 of the me
in order to condition the wiper set ‘to be driven
ter switch 350. Also, upon restoring, the line
one step in the clockwise direction away from its
relay Rttt interrupts, at the contacts 65!, the
home position.
_
previously traced loop circuit extending between ‘
Upon complete operation of the cam springs
2d and 25 to transmit the ?rst ground impulses, 40 the repeater tilt and the repeater selector its.
Upon reoperating, the line relay R1350 recom
ground potential is removed from the line con
pletes, at the contacts can, the previously men
ductors Cit! and C532 of the party subscriber
tioned loop circuit extending between the re- .
line itii, whereby the previously traced path for
short-circuiting the lower winding of the meter
peater see and the repeater selector-dds, recom
while the meter relay R6213 operates, the latter relay being of the differential type and the lower ‘
winding thereof being short-circuited at this time. '
relay Riiiii is interrupted and the previously
pletes, at the contacts ear, the previously men- _‘
traced circuit for energizing in series the lower
the upper-winding of the line relay Witt is recom
tioned circuit for energizing the winding of the
hold relay R068, and interrupts, at the contacts
1353, the previously traced circuitior energizing
pletedv When both the upper and'lower wind
- the winding’of the dial relay with; however, the
and upper windings of the meter relay Re?t and
ings of the meter relay Réi'iti are thus energized til) dial relay Britt does not immediately restore as
it is'of the slow to release type. At thispoint,
this relayrestores as it is of the di?erential type,
it is noted that neither the hold relay Redd nor
as previously noted; also, at this time, the line
the dial relay Rtiiu restores during impulsing;
relay nose retains its operated position. _ Upon
both of these relays being of the slow-to-release
restoring, the meter relay Rees interrupts, at
the contacts éi‘ii, the previously traced circuitv at type, as previously noted. The first restoration
and reoperation of the line relay Rttt is effective
for energizing the rotary magnet M3521, thereby
to cause the rotary magnet M352 to ‘restore; '
to transmit an impulse over the trunk tee to the
whereupon the wiper tel-of the meter switch 35%
is driven one step in the clockwise direction away
repeater selector 6%, thereby to cause the‘ re
peater selector tilt to take one step in the vertical
from its home‘ position.
direction,- in an obvious manner.
‘
Y
The impulse springs i9 and 2d of the calling de
- vice iii are then operated to transmit the first im
pulse, whereby the previously mentioned loop cir
cuit extending between the calling fourth party
subscriber substation tilt and‘ the repeater are
is interrupted and thenrecompleted, in an obvie _
ous manner.
When the previously mentioned
loop circuit is interrupted the series circuit ‘(for
energizing the lower and upper. windings of the
meter relay Edit and the upper winding of the
line relay Met is interrupted, thereby to cause
the meter relay RtZd to retain its restored posi
tion and to cause the line relay Rttt to restore.
Subsequently, when the above-mentioned loop
circuit is-recom'pleted the previously traced series
During the subsequent operation ofthe calling
device it the cam springs‘ 26. and 2E operate to
transmit their second ground impulse; vthenv the
. ‘impulse springs i9 and 2t operate to transmit
their second impulse; ‘and, ?nally, the cam
springs to and iii operate to transmit their third
ground impulse; at which time the ?nger wheel
of the calling device it is returned to its normal
position and the ?rst digit 2 has been transmitted
therefrom. The second and third ground impulses transmitted by the cam springs 2t and 2b
_ oi’ the calling device It cause the meterrelay
am to operate and then restore two additional
times; whereby the meter relay Rita is operated
and then-restored three times incident to the op
2,410,580
‘l5
eration of'the calling device I0 to transmit the
digit 2, in the-manner explained above. This
.
>16
tioned relay was fully operated at the conclusion,
_
of the ?rst digit 2 incident to the restoration
operation of the meter relay R420 causes the
of the dial relay R430, in the manner previously
wiper 35I of the meter switch 350 to be advanced
explained._ Finally, the subscriber at the calling
three steps away from its normal position in the 6 vparty subscriber substation 304 proceeds to dial
clockwise direction, in the manner explained
the third ‘digit 4, thereby to cause the line re
above. The second impulse transmitted by the
lay R450 to restore and reoperate four times in
impulse springs I9 and 20 of the calling device I0
order to transmit the four impulses of ‘the third
digit over the trunk 480and the repeater selec
ate one-additional time; whereby the line relay 10 tor 405 to the party connector 40L Also, in
causes the line relay R450 to restore and reoper
R450 is restored and then reoperated twice inci
dent to the operation of the calling device I0 to
transmit the digit 2, in the manner explained '
above.
This operation of the line relay R450
causes the digit 2 to be transmitted over the trunk '
480 to the repeater selector 405, in the manner
explained above.
cident to the dialing of the‘ third digit 4, the -
meter relay R420 operates and restores three
times; however, this operation of the meter re
lay R420 is without effect due to the fully oper-,
ated position of the digit cuto? relay R_4I0. In ,
v view of the foregoing explanation of the oper
ation of the meter relay R420,‘ incident to the dial
ing of the second and third digits, it will be un
digit 2 transmitted thereto to advance its wiper
derstood that this relay is effective to control
set two steps in the vertical direction; whereupon 20 the setting of the meter switch 350 only incident
The repeater selector 405 responds to the ?rst »
the wiper set thereof is operated automatically»
to the dialing of the ?rst digit of the directory
number, due to the full operation of the digit cut
nector in the group, including the party connector \
off relay R4I0 at the conclusion of the ?rst digit
40I, in an obvious manner. Assuming that the
of the directory number.
party connector MI is seized by the repeater se 25
The party connector 401 responds to the sec
lector 405, the party connector MI is then con
ond digit 3 and the third digit 4 in accordance
ditionedto be responsive to the second and third
with conventional practice inorder to seize the
digits 3 and 4, respectively, in accordance with
partly subscriber line I20. Upon seizing the party
conventional practice.
subscriber line I20, the party connector 40I tests
At the conclusion of the ?rst digit 2, the line 30 the-idle or busy condition thereof; whereupon
relay R450 reoperates, thereby to interrupt, at
busy tone current is returned over the repeater
the contacts 453, the previously traced circuit
selector 405, the trunk 480, the repeater 400,
for energizing the winding of the dial relay R430, '
the trunk 410, the party line switch 320 and the
in the rotary direction to ‘select an idle party con
'
whereupon the latter relay restores'shortly there
party subscriber line I30 to the calling fourth
after as no further restoration of the line relay 35 party subscriber substation 304 in the event the
R450 occurs until the subscriber at the calling
called party subscriber line I20 is busy at this
fourth partly subscriber substation 304 dials the
time. On the other hand, in the event the called
second digit 3. Upon restoring, the dial relay
R430 interrupts, at the contacts 433_,~the previ
~ ously traced path for short-circuiting the lower
winding of the digit cuto? relay R4I0, whereby
an obvious circuit, including the contacts 404 and
M2, is completed for energizing in series the
upper and lower windings of the digit cuto?
relay R4I0. When the above-traced circuit for
energizing in series the upper and lower wind
ings of the digit cutoff relay R4I0 is completed,
this relay takes a second step or operates fully,
thereby to interrupt, at the contacts v4i I, a fur
ther point in the previously traced‘ circuit- for '
energizing the rotary magnet M352.
At this time, the wiper 35! of the meter switch
350 has been operated three steps in the clock
wise 'direction'away from ,its normal position,
thereby to prepare a circuit traced hereinafter
for operating the meter M308 individually asso
ciated with the fourth party subscriber substa
tion 304 connected to the party subscriber line
party subscriber line I20 is idle at this time, the
party connector 40I operates in order to return
ring-back tone current over the previously traced
\ connection to the calling fourth party subscriber
substation 304 connected to the party subscriber
line I30; and to project 16 cycle ringing cur
rent over the called party subscriber ‘line I20.
The 16 cycle ringing current projected over the
called party subscriber line I20 causes opera
tion of only the harmonic ringer at the called
?rst party subscriber substation 3H connected
to the party subscriber line I20 due to the fact
that the harmonic ringers disposed at the sec
ond, third and fourth subscriber substations 8I2,
3I3 and 3I4, respectively, connected to the party
subscriber line I20, are respectively tuned to ring
ing currents having the respective frequencies
of 33, 50 and 66 cycles.
The subscriber at the called ?rst party sub
scriber substation 3I_I, connected to the party
subscriber line I20, answers the call by removing
I30.
‘
the receiver of the telephone instrument thereat
The subscriber at the calling party subscriber 60 from its associated switchhook, thereby to com
‘substation 304 then proceeds to dial the second
plete an obvious operative connection, including
digit 3,‘ ‘thereby to cause the line relay R450 to
the party subscriber line I20, between the ?rst
restore- and reoperate three times in order to
party subscriber substation 3H and the party
transmit the three impulses of the second digit
connector 40l. When this connection is com
over the trunk 480 and the repeater selector 405 65 pleted the party connector 40] operates in order
_ to the party connector 40 I. Incident to the dial
to reverse battery over the repeater selector 405
ing of the second digit 3, the calling device I0
and the loop circuit extending between the re
operates, in the manner explained above, in con
peater selector 405 and the repeater 400. When
nection with the dialing o! the first digit 2, where
battery is thus reversed over the above-mentioned
by the meter relay R420 operates and restores 70 loop circuit the left-hand winding of the answer
three times. -However, this operation of the
relay R440 is energized in the opposite direction,
meter relay R420, incident to the dialing of the
in an obvious manner, whereupon the answer re
second digit 3, is without effect due to the fact.
lay R440 operates. Upon- operating, the answer
that the digit cutoff relay R4I0 occupies its fully
relay R440 interrupts, at the contacts 442, the
operated position at this time, as the last-men 75 previously tramd circuit for energizing in series
' ‘
vl7
,
18
_
.
repeater 400 restores and the'repeater selector
the lower and upper windings of the meter relay
R420 and the upper winding of the line‘ relay ‘
R450; and completes, at the contacts 44!, an ob
vious alternative loop circuit for energizing in
series the upper and lower windings of the meter
relay R420 and the upper and lower windings of
the line relay R450, whereby the loop circuit ex
tending between the fourth party subscriber sub
station 304, connected to the party subscriber '
line I30, and the repeater 400 is balanced in order 10
to improve the transmission qualities thereof.
405 is released in order to effect the release of
the party connector 40I. When the repeater se
lector 405 is thus 'released the application of
ground potential is removed from the control
conductor C483 of the trunk 430, thereby to in
terrupt the previously traced holding circuit for
energizing in series the winding of the cutoff relay R330 and the rotary magnet M326 in the
party line switch 320, in order to cause the latter
relay to restore.
— Upon restoring, the hold relay R460 interrupts,‘
Fina1ly,the answer relay R440, upon operating,
at the contacts 464, the previously traced circuit
> completes, at the contacts 443, a circuit includ
~. for energizing in series the upper and lower wind
-ing the conductor C415 of the trunk 410, the
wiper 325 of the party line switch 320, the con 15 ings of the digit cutoff relay R4I0, thereby to
‘ tacts339 and the wiper 35I and engaged fourth
contact in the associated contact bank of the
meter switch 350 for operating the meter M308
cause the latter relay to restore. Also, upon re
storing, the answer relay R440 interrupts, at
subscriber line I30 in order to register the com-_
‘ _ pletion of a call from" the last-_mentioned party
tion 304, connected to the party subscriber line
I30. At this time the repeater 400 is completelyv
subscriber substation.
At this time, the previously traced loop circuit
extending between the calling fourth party sub
switcheshaving access thereto by the'absence of
25 potential upon the control conductor C413 of the
the contacts 443, the previously traced 'circuit
for energizing the meter M308 individuallyasso
individually associated with the fourth party sub
scriber substation 304,,connected to the party 20 ciated with the fourth party subscriber substa
released and is marked as idle to the party line \
scriber substation 304, connected to the party
subscriber line I30, and the repeater 400 is com
pleted; the previously traced loop circuit extend
lag between the repeater 400 'and‘the party con
_ trunk 410.
'
'
Upon restoring, the cutoff relay R330 in the
party line switch 320 interrupts, at the contacts
330, a further point in the previously traced cir
nector 40I is completed; and the previously men -30' cuit for energizing in seriesI the winding of the
cutoff relay R330 and the rotary magnet M326,
tioned connection extending between the called
and completes, at the contacts 331, an obvious
?rst party subscriber substation 3“, connected
circuit including the set of switch springs S354
to the party subscriber line I20, and the party
connector MI is completed. Finally, it is noted ' and the contacts 353 for energizing the rotary
magnet M352. At this point it is noted that the
that an operative connection between the trunk
set of switch springs S354 is actuated into engage
410 incoming to the repeater 400, and the trunk
ment when the wiper 35I of the meter switch 350
480 outgoing from the repeater 400, is completed
'is rotated in the clockwise direction away from.
by way of the condensers 4I3 and 4I4. Hence,
its home position. When thus energized the ro
an established connection is completed between
the calling fourth party subscriber substation 40 tary magnet M352 operates to interrupt, at the
304, connected to the party subscriber line I30,
and the called ?rst party subscriber substation
3I I, connected to the party subscriber line 420,
for two-way communication purposes.
' contacts 353, the previously traced circuit for en
ergizing the rotary magnet. M352, and ‘to con
dition the wiper 35I to be driven an additional
step in the clockwise direction. When the previously traced circuit for energizing the rotary
magnet M352 is interrupted the latter magnet.
restores, thereby to. recomplete, at the contacts
353, the circuit for energizing the rotary magnet
The release of_ the established connection be
tween the calling fourth party subscriber 'sub
station 304, connected to the party subscriber line
I30, and the called ?rst party subscriber substa
M352 and to drive the wiper 35I one step in the '
tion 3| I, connected to the party subscriber line
I20, is primarily under the control of the sub-' 50 clockwise direction away from its home position.
In view of the foregoing explanation of the mode "
scriber at the calling fourth party subscriber sub
of operation of the rotaryvmagnet M352, it will
station 304, and is accomplished when the sub
be understoodthat it is intermittently energized,
scriber thereat replaces the-receiver I03 upon
its associated switchhook, thereby to operate the '
hook switch SI04. When the hook switch ‘SI04 is
thus operated the transmitter I02 and the re
ceiver I03 are effectively disconnected from the
party subscriber line I30 and the previously tracedv
loop circuit extending to the repeater 400 is in
terrupted, at the contacts I05. of the hook switch
SI04, thereby to cause the line relay R450 in
the repeater 400 to restore. Upon restoring, the
line relay R450 interrupts, at the. contacts 452,
the previously mentioned circuit for energizing
the winding of the hold relay R460, thereby to
i - cause the latter relay to restore shortly there
after. Also, the line relay R450 interrupts, at
the ‘contacts 45I, the previously traced loop cir
thereby to drive the wiper 35I of the meter switch _
350 step by step in. the clockwise direction back
into its home position.
When the wiper 35I of '
the meter switch 350 is driven back into its home
. position the set of switch springs S354 is actu
ated into disengagement, thereby to interrupt a
further point in the previously traced circuit for
energizing the rotary magnet M352 in order posi'
tively to arrest further operation thereof. At this
time the meter switch 350 is completely released
and restored to its normal position and the party
line switch 320 ‘is completely released. It is again
noted that the wiper set of the party line switch
320 remains in engagement with the contact set
terminating the trunk 410 extending to the re
peater 400, as the party line switch 320 is of the,
cuit extending between the repeater 400 and the
repeater selector 405, andthe previously men 70 nonhoming type.
Also, when ground potential 'is removed from
tioned circuit for energizing the left-hand wind
the controlconductor C413 vof the trunk 410, the
ing of the answer relay R440. When the previ
application of ground potential to the control
ously mentioned loop circuit'extending between
conductor CI33 of the party subscriber line I30
the repeater 400 and the repeater selectorl405 is
thus interrupted, the answer relay-R440 in the 75 is interrupted,- thereby to mark the last-‘men
‘
19 i
'
2,410,520
.
.
'
~
20
nection is‘ extended by way of one of the indi
vidual connectors. Also, it will be understood
that the extension of a connection from an indi
vidual subscriber substation, connected to an
individual subscriber line, to one of the party
subscriber substations, connected to a party sub
scriber line, is substantially the same as that de
scribed above, whereby no metering is effected;
the above-mentioned connection is'extended by
way of the appropriate one of the 'party con
nectors 40I, etc. Finally, it is noted that the ex
tension of a call from an individual subscriber
substation, connected to an individual subscriber
line‘, to an individual subscriber substation, con
tioned party subscriber line as idle to the party
connectors 40I, etc., having access thereto. Also;
at this time, the party subscriber line I20 is
marked as idle to the party connectors 40I, etc.,
having access‘ thereto, assuming that the sub
scriber at the called party subscriber substation
3I I has replaced, the receiver of the telephone in
strument thereat upon its‘ associated switchhook.
Hence, the established connection between the
calling fourth party subscriber substation 304,
connected to the party subscriber line I30, and
the called ?rst party subscriber substation 3| I,
‘ connected to the party subscriber line I20, is com
pletely released at this time.
In view of the foregoing explanation of the
mode of operation of the apparatus incorporated
nected to an individual subscriber line, is in ac
in the telephone system to extend a connection
from the calling fourth- party subscriber substa
tion 304, connected to the party subscriber line
nection is extended by way. of one of the indi
cordance with conventional practice, whereby‘ no
metering is effected; the above-mentioned con
vidual connectors.
_
'
Considering the extension of a call from a
I30, to the called ?rst party subscriber substation 20
party subscriber substation, connected to a party
3I I, connected to the party subscriber line I20,
it will be understood that a call may be extended .
subscriber line, such, for example, as the fourth
therefrom to the called second, third or fourth
party subscriber substation 304, connected to the
party subscriber line I30, to the manual operator
party subscriber~ substations 3I2, 3I3 or (“4, re
spectively, connected to the party subscriber line 25 position 0, it is pointed out that the initiation
I20, in a substantially identical manner by dial
and extension of the call from the calling fourth
ing the appropriate directory number.. As will be
party subscriber substation 304 by, way of the
‘ apparent from the trunking plan, the directory
party line switch 320, the trunk 410, the repeater
numbers of the second, third and fourth party
400 and the trunk 480 to the repeater selector 405, ,
- subscriber substations 3I2, 3I3 and 3I4, respec
30 are the same as that previously explained.
tively, connected to the party subscriber line I20
At
this time the subscriber at the calling'fourth
party subscriber substation 304 dials the single
digit .0, whereby the repeater selector 405 op
are 3XX, 4XX and 5XX, or' 334, 434 and 534, re
spectively, in accordance with the foregoing ex--.
ample. The party connectors 40I, 402, 403 and
erates in order to seize an idle one of the trunks
404 respectively respond to the digits 1, 2, 3 and 35 in the group extending to the manual ‘operator
4, in accordance with the foregoing example, to
position 0. ‘The operator at the manual operator
seize the party subscriber line I20 and respec
tively ring the seized party subscriber zine I20
with ringing currents of the following frequen
cies: 16 cycle, 33 cycle, 50 cycle and 66 cycle. The 40
ringing currents of the respective frequencies
mentioned projected over the called party sub
position 0 answers the call in accordance with
conventional practice, whereby an established
connection is completed between the calling
fourth party subscriber substation 304, connected
to the party subscriber line I30, and the called'
manual operator position 0. In connection with
the extension of the above-mentioned call, it is
scriber line I20 operate the harmonic ringers at
the respective ?rst, second, third and fourth party
noted that the operation of the meter relay R420 '
subscriber substations 3I I, 3I2, 3I3 and3I4, con 45 in the repeater,400 and the meter switch 350, in
_ nected to the party subscriber line I20.
cident to the operation of the calling device I0
Also, it will be understood that a call may be
at the fourth party subscriber substation 304 to v
extended from, the ?rst, second or third party - transmit the digit 0, is the same as that previ
subscriber substations 30 I ,-302 or 303, respectively,
ously explained; However, it is pointed‘out that
. connected to the party subscriber line I30, to any
one of the party subscriber substations 3i I, etc.,
connected to the party subscriber line I20, in a
manner substantially identical to that explained
above. However, in the above-mentioned cases,
when the calling devices at the respective ?rst,
second and third party subscriber substations 30 I,
302 and 303, ‘respectively, connected to the party
subscriber'line I30 are operated, no ground im
pulses, one ground impulse and two ground im
pulses are respectively transmitted therefrom in
order to cause the corresponding ‘operations of
the meter switch'350, whereby the meters M305,
the above-traced connection does not include 9.
Accordingly, when the operator at
the manual operator position 0>answers the call,
battery potential is not reversed over the trunk
480 to the repeater 400. Hence, the answer relay
R440 in the repeater 400 does not operate in order
to effect operation of the meter M308 individually
. connector.
associated with the calling fourth party sub
_ scriber substation 304, connected to the party
subscriber line I30, in view of the fact that the _
above-mentioned call is a free call which is not
.metered. Thus it will be understood that, al
though the meter switch 350 is set to select the
M306 and M301 respectively corresponding to the
meter M300 incident to the dialing of the digit 0
?rst, second and third party subscriber substa
upon the calling ‘device I0 at the calling fourth
tions 30I,_302 and 303, respectively, are operated 65 party subscriber substation 304 ‘to extend the
in order to register the initiation of a call from
above-mentioned call to the manual operator
the corresponding party subscriber substation.
position 0, in the manner previously explained,
Further, it will be understood that the exten- , ' the meter M308 is not operated to meter the call
sion of a call from one of the party subscriber
when the operator at the manual operator'posi
substations, connected to a party subscriber line, 70 tion 0 answers the call,
'
to an individual subscriber substation, connected
Considering vnow the extension of a' call from
-to an individualtsubscriber line, ‘is. substantially
a‘ party subscriber-substation, connected to a
the same as that described above, whereby the.
‘party subscriber line, such, for example, as the
appropriate meter is controlled in the manner
fourth party subscriber substation 304, connected
previously explained; the above-mentioned con 75 to the party subscriber line I30, to the toll opera
21
3,410,520
22
-
.
all such modifications as fall within the true spirit
tor position I I0, it is pointed out that the initia?
and scope of the invention.
~ tion and extension of the call from the calling
_ What is claimed is:
I
fourth party subscriber substation 304‘by way
1. In an automatic telephone system, a party
of the party line switch 320,'the trunk .410, the
repeater 400 and the trunk 480 to the repeater (-1 line, a plurality of. stations on said party line;
a calling device at each of said stations, the call
ing
device at any calling one of said stations
plained. At this time the subscriber at the call
being selectively operable to transmit over said
ing fourth party subscriber substation 304 dials
party line during a single operation thereof ‘both,
the directorynumber H0, whereby the repeater a
variable digit and an individual station signal,
10
selector 405 responds to the ?rst digit 1 to select
whereby the calling devices at said stations trans
an idle special service selector, such, for example.
mit over said party line different station signals
as the special service selector- 405. The special
incident to operation thereof, switching appa
service selector 40B responds to-the second digit 1
ratus, means responsive to the transmission over
and drops back in a manner well understood, and
said party line of one or more variable digits for
then responds to the third digit 0 to select an idle
correspondingly setting said switching apparatus
selector'405, are the same as that previously ex
trunk to the toll operator, position H0. The op- ,
.to extend the. call from the calling one of said
erator at the toll operator. position H0 answers
stations, a plurality of registers individually cor
responding to said stations, a register switch hav
the call in accordance'with conventional practice,
‘ whereby an established connection is completed
between the calling fourth party subscriber sub 29 ing access to said registers;-.and additional means
controlled only in response to the ?rst transmis
station 304, connected to the party subscriber line
sion over said party line of the station signal in
I30, and the called toll operator position H0. In
dividual to the calling device at said one station ,
connection with the ‘extension of the above
‘for operating said register switch to select the
mentioned call, it is noted that the operation oi_
one' of said registers corresponding to said one
the meter- relay R420 in the repeater 400 and the 25
meter switch 350, incident to the operation of
2. In altelephone system; a line, a calling de
the calling device 10 at the fourth party sub
vice associated with said line, said calling de
- scriber substation 304 to'transmit the' ?rst digit 1,
vice being selectively operable to transmit over
is the same as that previously explained. How
said line during a single operation thereof both
ever, it is pointed out that the above-traced con 30 a variable number of a?rst type of impulses and
nection does not include a’ connector. Accord
a ?xed number of a second type of impulses, a
' ingly, when the operator at the toll operator
trunk circuit associated with said line and in
position H0 answers the call, battery potential is
cluding. a ?rst line relay controlled by the ?rst
not reversed over the trunk 400 to the repeater
type of impulses transmitted over said line and .
35
400. Hence, the answer relay R440 in the re
a second line relay controlled by the second type
peater 4100 does not operate in order to effect
of impulses transmitted over said line, a ?rst
operation of the meter M301 individually asso
control circuit governed by said ?rst line relay,
ciated with the calling third party subscriber
a second control circuit governed by said sec
substation 303, connected to the party subscriber 40 ond line relay, and means governed by said ?rst
line I30, in view of_ the fact that the above
line relay for interrupting said second control
mentioned call is a iree call which is not metered.
circuit.
Thus it will ‘be understood that, although the
3. In a telephone system, a line, a calling de
meter switch 350 is set to select the meter M301
vice associated with said line, said calling device
incident to the dialing of the ?rst digit 1 upon the
being selectively operable to transmit over said I
calling device I0 at the calling fourth party sub 45 line during a single operation thereof both a var
scriber substation 304 to extend the above-men
iable number of a ?rst type of impulses and a
tioned call to the toll operator position H0,v in
?xed number of a second type of impulses, a
' the manner previously explained, the meter M301
trunk circuit associated with said line, said trunk,
is not operated to‘ meter the call when the op 50 circuit including a ?rst line relay provided with a
erator at the toll operator position H0 answers
winding connected to said line and controlled by
the call.
the ?rst type of impulses transmitted over said
In connection with the extension of the above
line and-a second line relay provided with two
mentioned call,_,it is noted that incident to the
differential windings bridged across said line and
operation of the calling device l0 at the calling
controlled by the secondtype of impulses trans
fourth party subscriber substation 304, connected
mitted over said line, a ?rst control circuit gov
to the party subscriber line I30, to transmit the
erned by said ?rstline relay, a second control
?rst digit 1 to the line relay R450 in the repeater
circuit governed by said second'line relay, and
400, this calling device l0 also sends two ground
means governed by said ?rst line relay for in
impulses to the meter relay R420 in the repeater
a: O terrupting said second control circuit,
400, thereby to cause the meter switch 350 to
4. In a'telephone system, a line, a calling de
station.
select the meter M301 individually associated with
the third party subscriber substation 303 instead
.
vice associated with said line, said calling device
being selectively operable to transmit over said
line during a single operation thereof both a var
of the meter M308 individually associated with the
calling fourth party subscriber substation 304 as
previously noted. However, the selection of the
improper meter M301 by the meter switch 350
iable digit and a ?xed number of signal impulses,
a trunk circuit associated with said line and in
cluding a ?rst line relay controlled by the im
in connection with the extension of the above
mentioned call is immaterial as the meter M301
is not operated, as explained above.
'
’
While there has been L scribed what is at
pulses of the digits transmitted over said line
and a second line relay controlled by the signal
impulses transmitted over said line, a ?rst con
trol circuit governed by said ?rst line relay, a
second control circuit governed by said second
line relay,-and means governed by said ?rst line
various modi?cations may be made therein, and
it is contemplated to cover in the appended claims 75 relay at the conclusion of the first digit transmit
present considered to be the preferred embodi
,,_ment of the invention, it will be understood that
/
2,41 0. 520
23
24
ted over said line for interrupting saidisecond
line during a single operation thereof both 8. variable digit and an individual ?xed number of
_ control circuit.
5. In a telephone system, a line, a calling de
vice associated with said line, said calling device
being selectively operable to transmit over said
line during a single operation thereof'both a var
iable digit and a ?xed number of signal impulses,
station impulses. whereby the calling devices at
said stations transmit over saidwparty line dit
terent numbers of station impulsesjncident to
operation thereof, a repeater, meansiij ponsive
to the initiation of a call at anyone oigvsaid sta
tions for connecting said party line to said re
peater, said repeater including a ?rst line relay
said trunk circuit including a ?rst line relay con 10 controlled by the impulses of the digitv transmitted
trolled by the impulses of the digits transmitted
over said party lineand a second line relay con
‘,over said line and a second line relay controlled
trolledby the station impulses transmitted over
by the signal impulses transmitted over said line,
said party line, a switch associated with said re
means governed by said first line‘ relay i'or set
peater, means governed by said ?rst line relay
ting said switch, means governed by said second 15 for repeating to said switch the'impulses of the
' line relay for setting said counter, and means
digit received over said party-line, thereby to set
governed by said ?rst line relay at the conclu
said switch in order to extend the call from said
sion of the ?rst digit transmitted over said line
party line, a counter associated with said re
for arresting further setting of said-counter.
peater, and means governed by said second line
6. In an automatic telephone system, a party
relay for setting said counter in accordance with
line, a plurality of stationson said party line, a
the number of station impulses received over said
calling device at each of said stations, the calling
party line, thereby to identify the particular call
device at any calling one of said stations being
ing one of said stations on said party line.
selectively operable to transmit over said party
JOHN ELLIS OSTLINE.
a trunk circuit associated with said line, a switch
and a counter associated with said trunk circuit,
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