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Патент USA US2410866

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Nov. l2, 1946.
2,410,866
K. L. BURGENER
TELEPHONE SYSTEM
Filed April 17, 1944
2 Sheets-Sheet 1
INVENTÜR.
KARL L. BURGENER
¿25X ¿W4
_ATToR NEY
Nov. 12, 1946.
K. L. BURGENER
' 2,410,866
-TELEPHONE SYSTEM
Filed April 17, 1944
2 VSheets-Sheet 2
n
w.
m
Ow
N9. .
INVENTOR.
KARL L. BURGENER
2,410,866
Patented Nov. 12, 1946
Tuur ori-‘ICE
UiiiilTED
2,410,866
rnLEr'noNE SYSTEM
Karl L. Burgener, Villa Park,A Ill., assignor to
Automatic Electric Laboratories, Inc., Chicago,
lill., a corporation of Delaware
Application April 17, 1944, Serial No. 531,389
`19 Claims. (Cl. 179-84)
1
The present invention relates to telephone sys
tems in general, and more particularly to im
iting factor being the presence of the called party
on the line.
The uniformity of quick ringing cut-off on
party lines is accomplished by adjusting the re
sistance Value of the local, or holding, circuit of
ing cut-olf in manual and automatic telephone Ul the combined ringing and ringing cut-off relay in
switchboards.
`
direct relationship to the frequency of ringing
An object of the inventon is to provide new
current used in each instance. Each frequency
and novel circuit arrangements for applying and
of ringing current is allocated a certain resist
disconnecting >automatically-interrupted ringing
ance value for `the holding circuit of the relay.
currents to vand from arplurality of connecting
For example, a greater1 resistance value is inserted
circuits in a telephone system.
,
in the holding circuit of therrelay when L'iO-cycle
Another object of the invention is to provide
ringingl current is selected than when the ring
new and novel circuit arrangements to enable a
ing current is iii-cycles, in order to accomplishH
called party, when answering a call, to out oil
an equivalent quick ringing cut-off. These ad
quickly the ringing current during either the ring
` justed resistance values enable the combinedl ‘
ing or silent periods, and to provide inY these _ar
ringing and ringing cut-off relay to perform uni- l
rangements a greater margin of operation over
formly and emciently over the entire range of
more severe subscriber line circuit conditions than
ringing current frequencies.
is possible with» the present practice,- cf ringing
A feature of the invention is that the resistance
cut-off relay operation. For example, in a tele 20 value of the holding circuit of the combined ring
phone system employing party lines, a greater
ing and `ringing cut-off relay is varied by means
number of substation ringers may be bridged
of compensating resistances connected in series
across a line of higher loop resistance and lower
with the holding winding of the relay, the proper
insulation resistance with the ringing cut-off
resistance value being selected automatically _at
method provided in the invention than with any 25 the time the required frequency of ringing cur
other system cf quick ringing cut-off known to
rent for signalling the desired called party is se
the art.
`
lected.
A further object of the invention is to provide
Another feature of the _invention is that theV
uniform quick ringing cut-off with all frequencies
greater Vmarginv of operation» for the combined
of ringing current, when party-line ringing is 30 ringing and ringing cut-olf relay obtained in the
employed, in order that the ringing cut-off be
manner described inthe preceding paragraph,
practically instantaneous regardless of the fre
provides for quicker ringing cut-off withv any fre
proved circuits for automatic individual-line ring
ing, automatic party-line ringing, and quick ring
quency of ringing current which may be used for
quency of ringing current on a short line of
signalling the called substation. Under the pre
relatively low resistance than with any other sys
vailing circumstances of the art, ringing cut-off 35 tem of quick ringing cut-off relay operation.
is relatively much slower with the higher fre
Damage to the transmitter of the answering tele
quencies of ringing current than with the lower
phone on a low resistance line, where the ringing
frequencies. `The invention includes new and
current flow is obviously relatively large, is, there
novel means for overcoming this inequality of
fore, minimized because the ringing cut-off is
ringing cut-off, thereby providing for uniform 40 -practically instantaneous when the handsetof
quick ringing cut-off over` the entire range of
the answering telephone is lifted during a ring
ringing current frequencies.
ì
.
ing period.
‘
In- order to accomplish the above described
Anotherv feature of the invention is that the
objects, the invention combines the control of the
adjusting of the resistance value of the holding
ringing application and the ringing cut-olf func 45 circuit of the combined ringing’ andr ringing cut
tions t'o- one relay. This combined ringing and
loff relay in direct relationship to the frequency of
ringing cut-off relay operates overA a local circuit
the ringing current used tosignal the called sub
to supply ringing current to the selected line, and
station, enables the power inthe holding winding
releases to, disconnect the ringing current from
of the combined ringing and ringing cut-off relay
50
the line when the called party answers. In addi
' to offset; or neutralize, the additive eiîect of the
tion, when the connection is kcompleted by an
alternating ringing , current during the periods
operator, means are provided so that the operato-r
when the alternating current in the line winding
starts or restarts the automatic ringing as inde
of the relay is i'n Athe direction to aid the super
pendent> operations entirely dissociated“ from any
imposed direct current in the line winding' of the
55
means for selecting the called line,v the only lim
3
2,410,866
relay. Hence, the power in the line winding of
the relay does not overcome the power in the
holding winding at any period and cause the relay
to remain operated and continue to send ringing
current out on the line after the called Darty
has answered. Quick ringing cut-olf is thus as
sured with any frequency of ringing current.
There are other objects and features of the
invention havingI to do for the most part with
the circuit details involved in carrying out the
foregoing.
The various objects and features of the in
vention will be understood best upon a further
perusal of the description in connection with the
accompanying drawings, comprising Figs. l and
2, showing by means of the usual circuit dia
grams so much of the apparatus in a telephone
system embodying the features of the invention
as are necessary to an understanding of the same.
Referring now to the drawings, Fig. 1 illus
strates a cord circuit of a manual telephone
switchboard utilizing the present invention. The
invention may, 0f course, be applied to any well
known type of cord circuit equipped to perform
any combination of well-known functions asso
ciated with a manual telephone switchboard.
4
pose of reducing possible shocks t0 the operator
in the handling of the plug.
When a call is received at the jack JI over a
local battery line instead of a common batteiy
line, sleeve relay Il of the cord circuit does not
operate when the plug PI is inserted into jack
J I because the resistance of relay I0 is sufficiently
high to prevent the operation of sleeve relay |'|.
The lower winding of relay |2, therefore, re
mains connected to the windings of the repeat
ing coil at contact I8, and relay I6 is not con
nected to the repeating coil. Consequently, no
transmission battery is supplied to the calling
line.
time.
Relay I2 performs no function at this
~
Having inserted the plug PI into jack J I, the
operator throws the talk key of the cord cir
cuit in order to converse with the calling party.
The operation of the talk key closes the circuit
20 of splitting relay 29, the operation of which di
vides the cord circuit into two sections in the
well-known manner, and extends both sections
to the operator common position circuit shown
in Fig. 2. The tip and ring of the answering plug
PI are connected to the common position cir
cuit inductively through the windings of the re
peating
coil and then via the upper and lower
tion equipment common to all of the cord cir
front contacts of relay 29 and conductors 00 and
cuits of the switchboard, including the various
keys, relays and operator telephone set. It is 30 6I. The operator telephone set shown at the
left on Fig, 2 is, therefore, connected to the an
understood that the common position equipment
swering plug P| via contact |01 of relay |04,
may be of any well known type, with common key
upper winding of operator induction coil, contact
functions such as are shown on Fig. 2 of Crocker
|05 of relay |04, contact I| 2 of cut-off answer
Patent 1,771,842 and described in the associated
key and conductor 60 for the tip side; and via
specification.
contact |0| of relay |04, lowerwinding of op
The invention having been described generally,
erator induction coil, contact |02 of relay'I04,
a detailed operation of the apparatus shown will
contact |08 of cut-off answer key and conductor
now be given. For this purpose, it will be as
8| for the ring side. The operator may now ob
sumed that the operator receives a call over a
the number of the desired station from the
line circuit represented by jack J | on Fig. 1. 40 tain
calling
party.
This line circuit may be of any well-known con
The operation of splitting relay 29 also switches
ventional type either common battery or local
the calling section of the cord circuit, including
battery, the difference with respect to the cord
the sleeve conductor of calling plug P2 and the
circuit being in the resistance value of relay I0
associated sleeve relay 40, to the common position
connected to the sleeve spring of jack J I , If
circuit shown in Fig. 2, but these switchings per
the subscriber line is of the common battery type,
form no functions at this time. The resistance
the resistance value of relay I0 will be relatively
coil wired in multiple with the winding of relay
low, and if the subscriber line circuit is of the
29 provides spark protection for the Contact of
local battery type, the resistance value of relay
the talk key.
|0 will be relatively high, The purpose of the 50
Having ascertained the number of the desired
differences in resistance values of relay I0 is to
line, the operator restores the talk key to normal
operate certain relays in the cord circuit when
and then inserts calling plug P2 into jack J2
the line circuit is of the common battery type,
which is assumed represents the desired line. As
and to prevent the operation of certain relays in
in the case of the line circuit connected to jack
the cord circuit when the line circuit is of the
J |, the line circuit connected to jack J2 may also
local battery type.
be of either the common battery or local battery
Assuming that the operator has received a call _
type, and the resistance value of relay 48 connect
over a common battery line, the operator inserts
ed to the sleeve spring of jack J2 will be corre
the answering plug PI of an idle cord circuit into
spondingly low or high.
jack J i. When the plug PI enters the jack J |,
The
restoration
of
the
talk
key
to normal posi
the relay |`| of the cord circuit is energized
tion releases the splitting relay 29, and the re
through the sleeve of the plug and the jack and
storing of relay 29 disconnects the common posi
relay I0. Relay |'| operates, disconnects relay
tion
circuit from the answering and calling sec
|2 from the repeating coil at contact I8, and
connects the windings of relay Iâ to the tip and 65 tions of the cord circuit, and re-establishes the
Fig. 2, when placed below Fig. 1, shows posi
ring conductors of the calling line through wind
ings of the repeating coil. Relay I'I also closes
the circuit of the answering, cord supervisory lamp
momentarily at its upper front contact. Relay
transmission circuit between the answering and
calling-sections of the cord circuit. Relay 29 also
re-connects the sleeve of the calling plug P2 to
the sleeve relay 40.
,
The cord circuit is equipped with a tip- busy
I6, however, operates through the calling party 70 test
and, consequently, in case the line circuit is
telephone loop to open the answering cord super
of the multiple jack type, the operator may make
visory lamp circuit at a back contact. Relay I6
also supplies transmission battery to the calling
party. The resistance coil which is wired in mul
tiple with the winding of relay I 1 is for the pur
the conventional tip busy test before inserting the
calling plug P2 into jack J2. The tip busy test
circuit may be traced
from the sleeve of jack J2,
n
75 tip of calling plug P2, contact 46 of ringing call
2,410,866l
key, contact 42 of relay 40, conductor 53 to the
common position circuit shown in Fig. 2, upper
right-hand winding of theA monitor and busy test
coil toposi-ti-ve battery, and inductively to the cor
responding upper left-hand winding of t‘n'e moni 5
tor and busy test coil to the operator’s receiver.
The lower right-hand winding oi the monitor and
busy test coil is extended along by means of con
ductor 53, said conductor 59 being twisted into a
pair with conductor 58 to obtain a balance so thatv 10.l
the busy test clicks will not be introduced indue
tively into other cord circuits. Conductor 59 is
not connected to the cord circuit.
Assuming that the selected line isv of the». com
mon battery type, sleeve relay 43' is, energized,
when the calling plug P2 is inserted'. into jack J2,
through the sleeves of the jack and the plug and
the center back contact of relay 29. The opera-q
tion of sleeve relay 4i] causes sleeve relay I9 to op
erate through contact 3B, as sleeve relay> i9 is of
such resistance that it will operate from the rela»
tively low resistance of relay 48 in multiple with
ductor of'calling plug P2. The desired «telephone ‘
on the plugged-up line is, therefore, rung.- auto'
matically-until either the called station answers
or the Ycalling partyv abandons the call.. Ring
back tcne is supplied to the calling party through
the small-capacity condenser bridged around
contact 3l of relay 33. The combined ringing
and ringing cut-oir relay 33: remains operated
duringr the automatic signalling oi thecalledv sta
tionV because the circuit- of the direct-current
component of the ringing current through' the
line winding of relay 33 is> not closed@ until the»
called party lifts the hand-setfrom the telephoneA
cradle.
The operation of the combinedi ringing andk
ringing cut-off relay 33 also opens the calling."
cord supervisory lamp- at Contact 31 thus giving
the operator ringing supervision, well-known as
“dark keyshelf,” to indicate that the operator’s
work on this connection has been completedlun
til disconnect supervision is received. Disconnect»
supervision will be received when the calling and
called parties have completed their conversation
the winding of sleeve relay 4D. Sleeve relay 40
and reutrneol. their handsets> to the respective
opens the tip busy test circuit at contact 42, and
cradles.
25
extends the tip conductor through contact 4l to
When the calledï party answers, the circuit‘o'f
the combined ringing and ringing cut-off relay 33.
the direct current through the lower, or line,
Sleeve relay la disconnects relay 23 at contact
winding of the combined ringing and ringing cut
23, connects the transmission battery feed relay
oiï relay 33 is closed through the telephone loop.
23 to the inside terminals of the calling half of
This
direct current in the line winding neutralizes-the repeating coil, extends ground potential from 30 the direct
current in the holding winding: of' re-`
the front contact of relay l5, contact 2l of relay
lay 33 and relay 33 restores to normal, removing
i3 to contact 24 of relay 23, and completes the
ringing current from the line and» extending the
circuit of the calling'cord supervisory lamp from
tip and `ring conductors ofîtlie calling plug P25 to
contact 22 through contact 31 of relay 33 and the
the repeating coil. Relay 231 operates onv the
35
upper back contact of relay 23.
„
called
party loop to supply transmission battery,
Assuming that the desired telephone connected
and'
also
opens the calling cordI supervisory lamp.
to jackJZ is-to be signalled with the, ringing fre
circuit at its upper back contact, thusl retaining
quency> 2, the operator depresses momentarily the
the “dark keyshelf.” The transmission circuit
ringing key 55 all the way down, and the ringing
between thev calling and called 4parties is corn
key 55 will return tok and remain in the ringing
pleted induotively through the windings of the
position, in the well-known manner, with its back
repeating
coil.
contacts openand the front contacts closed. The
If the called party should disconnect prema
iirst action of the downward stroke of key 55
turely and the calling party requests thevopera
automatically restores any of the keys 53, 54, or
tor to reestablish the connection, the operator
5E which maybe in the ringing position, and then 45 may
restart the ringing on the called line by de
contact 51 is operated at the bottom of the down
pressing ringing keyv 55 all- the way Adown mo
ward stroke. it is understood that the four keys
mentarily, and relay 33 will again operate and
53, 54, 55 and 5G and the common contact 51 are
lock up and reconnect ringing current to the tip
mounted on one escutchecn and interlocked by
and ring. conductors of calling plug P2.` AIt is
means of a ladder releasing mechanism in the 50 unnecessary for vthe operator to request there
well-known manner so that only one key~may be
quired. frequency Ifor the rering,.as the ringing
in the ringing position at one time.
key used` for the original ringing will remain in
The selection of frequency 2 by the operator de
the ringing position (partly depressed) until later
pressing ringing, button 55, causes the combined
released by the depression of ringingk key button
ringing and ringing cut-off relayA 33 to operate 55
53, 54, or |56 ona new call.
from ground potential, front contact of relayV l5,
When> a connection requires the use of fre.
contact 2l of relay I9, contact 24 of relay 23, con
quency 5, the operator’s ringing routine. is
tact 51 oi the ringing key, upper winding of relay
changed somewhat since there are only four ring
33 to negative battery, andl to lock up from ground
ing key buttons on the ringing key assembly- corn
potential, front contact of relay l5, contact 2l of 60 prising keysY 53, 54, 55 and 56. The lever type
relay I9, contact 24 of relay 23, upper back contact
ringing call key associated with the calling plug
of ringing key 53, upper front contact of ringing
P2 is used for ringing the called linewith fre
keyy 55, compensating resistances 5l and 52 in se
quency 5, and is mechanically associated with
ries, contact 33 of relay 33, upper winding of relay
the button> type ringing keys 53, Á54, 55 and 56 inA
65
33 to negative battery;
suchl a well-known manner that when theV lever
The operation of the combined ringing and
type ringing call key is operated, any of the ring
ringing cutnoii relay 33 connects the tip conductor
ing keys 153, 54, ‘55 or 53 that may be in the ring
of the calling plug P2 to ground potential through
ing position will be automatically released and
Contact 43 of ringing call key, contact 4l of relay
restored to normal. The automatic ringing start
43 and contact 35 of relay 33, and also connects 70 for frequency 5`is established through contact 45
negative-battery superimposed ringing current
of the lever ringing call key since contact 45 of
from the lower front contact of ringing key 55,
the lever ringing call key is in multiple with con-v
lower back contact of ringing key'5íâ, lower, or
tact 41 of the button ringing key assembly, thus
line»,A winding of relay 33, contact 32 of relay 33,
operating and locking up relay 33 in» a similar
contact 44A of theïringing‘call key tothe ’ring cone` 75
2,410,866
manner to that described for frequency 2. The
ringing circuit for frequency 5 may be traced
from the lower back contacts of ringing keys 53,
54, 55 and 56, through the lower winding of re
lay 33, contact 32 of relay 33, ring conductor of
calling plug P2, out on the line and returning
over the tip conductor through contact 35 of re
lay 33 to ground potential.
When the called line is of the local battery type,
the operator signals the desired telephone man
ually by means of the lever'ringing call key as
sociated with the calling plug P2. Uninterrupt
ed generator of frequency 5 is supplied to the
ring side of calling plug P2 through contact 43
of ringing call key and then out on the line and
returning over the tip conductor to ground at
Contact 4l of ringing call key.
' ,
ring side. Operating the cut-off answer key dis-V
connects the operator telephone set at contacts
|08 and || 2, and places a bridge | I0 across the
repeating coil via conductors 60 and 6|, thus
enabling the operator to converse with the called
party via conductors 64 and 65 without overhear
ing by the calling party. In a similar manner,
the operator may converse privately with the call
ing party by operating the cut-off call key. Fig. 2
may incorporate any of the Well-known common
position key operations such as dial keys, refund
and collect paystation keys shown in Crocker
Patent 1,771,842 and any other key functions
known to the telephone art.
Disconnect supervision is obtained on a com
pleted connection where both the calling and
called lines are common battery, when the calling
_and called parties restore their handsets to the
.After the operator has completed a connection
between the calling and called party, she may
operate the talk key of the cord circuit to split 20. respective cradles, and the transmission battery
feed relays I6 and 23 correspondingly restore to
the cord circuit into two sections and switch au
normal. Responsive to the releasing of relay I6,
tomatically both sections of the cord circuit to
the circuit of the answering cord supervisory lamp
the common position circuit shown in Fig. 2, for
is closed from ground potential at the upper make
the purpose of monitoring the established con
contact of relay |'|, back contact of relay I6, an
' nection, talking to either party without overhear 25. swering supervisory lamp to negative battery; and
ing by the other party, refunding and collecting
responsive to the releasing of relay 23, the circuit
paystation deposits, or performing any other
of the calling cord supervisory lamp is closed from
functions that may be associated with the com
ground potential at contact 22 of relay I9, con
mon position circuit. As previously explained,
3'! of relay 33, upper back contact of relay
the operation of splitting relay 29 switches the 301 tact
23, calling supervisory lamp to negative battery.
tip and ring conductors of the answering` plug
Disconnect supervision when the calling line is
PI to the common Iposition circuit via conductors
of
the local battery type is obtained by the calling
60 and 6|. The tip and ring conductors of the
party turning the hand generator of his tele
calling plug P2 are switched to the common po
sition circuit via contact 46 of the ringing call
key, contact 4| of relay 40, contact 36>of relay 33,
the upper make-before-break contact of relay 29
and conductor 64 for the tip side; and contact
44 of the ringing call key, contact 3| of relay
phone. As previously explained, sleeve relay |`|
does not operate when the answering plug Pl
is 4inserted into jack J | because of the high re
sistance value of relay |0. The lower Winding of
relay |2, therefore, remains connected to the
repeating coil at contact |8.
current
33, the lower make-before-break Contact of re 40 from the hand generator causesRinging
relay |2 to op
lay 29 and conductor 65 for the ring side.
erate and close Contact |5 and thereby complete
'I‘he operation of relay 29 by the talk key also
the
holding circuit of relay I2 from ground po
connects .the sleeve of the calling plug P2 to the
tential
at contact 30 of relay 29, contact |5 of
common position circuit via the center make-be
relay |2, upper winding of relay I?. to negative
fore-break contact of relay 29 and conductor 63; 45 battery. Responsive to the locking of relay |2,
and the sleeve relays I9 and 40 in multiple via
the circuit of the answering cord supervisory lamp
the center front contact of relay 29 and conduc
is closed from ground potential at contact I4
tor 62. The purpose of disconnecting the sleeve
relay |2, answering supervisory lamp to negative
of the calling plug P2 from the associated sleeve
battery.
The resistance coil || wired in multiple
relays I9 and 40 and extending both units to the 50
with the upper winding of relay | 2 provides spark
common position circuit is to enable the operator
protection for contact |5. The resistance coil |3
to insert automatically a dial in the sleeve con
connected in multiple with the lower winding of
ductor of the calling plug P2 when the call is to
relay |2 when relay |2 is locked up, provides a
be extended to an automatic switchboard. The
lay-pass for subsequent ringing current to pro
circuit details of the dial connections have been 55
tect
relay I2 from accidental ring down should
omitted from Fig. 2 as it is understood that such
suincient ringing current pass through its lower
details are not essential to an understanding of
winding to neutralize momentarily the holding
the invention.
current in the upper winding.
Fig. 2 is equipped with cut-oil keys for cutting
off either the answering or calling plugs and con 60, Disconnect supervision when the called line is
of the local battery type is obtained by the called
necting them to the operator’s telephone equip
party turning the hand generator of his telephone.
ment shown to the left on Fig. 2. A commonV
Sleeve relay I9 does not operate when the calling
monitoring key is also shown in Fig. 2 which,
plug P2 is inserted into jack J2 because ofthe
when operated, causes the associated switching
relay |04 to connect the operator's receiver to a 65 high resistance value of relay 48. The lower wind
ing of relay 26, therefore, remains connected to
monitoring coil for the purpose of monitoring an
the repeating coil at contact 20. Ringing cur
established connection without materially reduc»
rent from the hand generator causes relay 26 to
ing the transmission eiûciency orin any wayin
operate and close contact 28 and thereby com
terfering with the‘connection. The monitoring'
circuit may be traced from operator receiver, 70 plete the holding circuit of relay 26 from ground
potential at contact 30 of relay 29, contact 28 of
upper winding of monitor coil, contact |06 of
relay 26, upper winding of relay 26 to negativerelay |04, contact | |2 of cut-oiî answer key and
battery. Responsive to the locking of relay 26, the
conductor 60 for the tip side, and from operator
circuit of the calling cord supervisory lamp is
receiver, contact |03 of relay |04, contact |08
of cut-off answer key and conductor 6| for the 75 closed from ground potential at the upper front
contact of relay 26, upper back contact of relay
2,410,866>
9 ..
10
operator-controlled means «for establishing a con
23, calling supervisory lam-p to negative battery.
nection to said party line, a` plurality of signal
The resistance coil I2"! wired in multiple with the
ling current sources, means for vselect-nig the
upper winding of 'relay 26 provides spark protec
proper source to signal a party on said line, a
tion for contact 2li. The resistance coil 25 con
relay having two windings, operator-controlled
nected in multiple with the lower winding ci
relay 26 when -relay 26 is locked up, provides a
means for operating said relay through one wind
ing thereof to close a signalling circuit including
said selected source, the other winding of said
relay »and the called line, and. means controlled by
by-pass for subsequent ringing current to protect
relay 26 from accidental vring down should Suni
cientringing current pass through its lower wind
the called party’s response .for .releasing said Írelay
.ing to neutralize momentarily the holding current 10 to disconnect said sourcefrom the called line.
in the upper winding. The vcondenser in series
with the lower winding of relay 2li is provided for
.4. In a telephone system, subscribers’ lines, op
extending `a connec
tion to one of said lines, a signalling current
source including a direct current qsuperimposed
on an alternating current, a relay having two
` crater-controlled .means for
the purpose of preventing supervisory signal in
terference between a common battery line on
one cord circuit and a local battery line on an
other cord vcircuit should the operator use the
windings, operator-controlled means for energiz
talk keys of both cord circuits for “over-lap”
ing said relay through one winding thereo'f- .to
close a signalling circuit yincluding said Isourcaft'he
service.
A common group of iive push button ringing
other winding >of said relay 'and the ‘called line,
keys shown at the lower left on Fig. l is multipled 20 the alternating current component of said source
to the lever ringing keys associated with the an
supplying the power .ior'signalling the .called'line
swering plugs of the cord circuits to enable the
and means including the direct current com
operator. to rering parties on the answering plug
ponent of said source »and responsive lto the called
PI. The rering is done on a manual basis only,
subscriber answering for releasing said .relay "to
with the operator applying the ringing current
disconnect said source.
5. In a telephone system, subscribers" lines,
by means of the lever ringing key associated with
the answering plug Pl. No wiring is required on
means for extending a connection to one o'f said
lines, a source of signalling current, a relay in
cluding a winding, a key for causing said relay
the 4frequency 5 ringing key, as frequency 5 is
wired through the back contacts of the ringing
keys associated with frequencies I, 2, 3 and 4 to 30 to operate and complete a signalling circuit in
cluding said source, said winding and Ythe called
the ringing common contact on the R side of the
lever ringing key. Frequency 5 ringing button is
line, and means for releasing saidrelay respon
sive to the called subscriber answering, said sig
depressed when frequency 5 `ringing current is
required, in Order to release and restore any of
nalling circuit being instantly disconnected when
the ringing keys associated with frequencies l,
said relay releases.
2, 3 or 4 that may be in the ringing position.
The lever ringing keys associated with both the’
answering and calling -plugs, and also splitting
relay 33, are ñtted with an extra iront contact
for starting the .ringing machine whenever Ysuch
,
,
6. In a telephone system, a called line, means
for establishing a connection to said line, a sig
nalling current source, a double-wound relay, a
key vfor completing a circuit through one winding
40
of said relay for causing >said relay -to operate
and lock through >said Winding yto close a signal
well-known ringing varrangements are provided.
It should be understood that while `the forego
ling circuit for said line, said signalling Acircuit
including said source, the second winding oisaid
’ ing description and .associated drawings disclose
the invention as specifically used on connecting
relay and the called line, and means ycontrolled
circuits ofthe manual vswitchboard cord type, ‘the
lby the called party’s response vfor causing .the
invention is not limited to such connecting cir
cuits but may be applied to any type of connecting
circuit in which automatic ringing is employed.
Having described the invention and what is
considered new and desired to 'be protected by
Letters Patent is set forth in the following claims:
What is claimed ist
release of said relay `to disconnect said .source
l. In a telephone system, a calling and a called
line, operator-controlled means for establishing
a connection between said lines, a source vof sic
nalling current, a relay, operator-controlled
means for operating said relay to close `a signal
ling circuit including said source and the called
line, and means eiiective upon the response of
the called party for operating said relay in series
with said line to disconnect said signalling circuit
from said line.
y
2. In a telephone system, a calling and a called
line, operator-controlled means i or :est a'blisloingV
from said line.
~
'7. In a telephone system, `a 'called party 1ine,
means for establishing a connection to said party
line, a plurality of signalling current sources, a
plurality of keys for selecting the proper source
, to signal the called substation on said line, :a relay
having a pair of windings, a circuit controlled by
any one of said `plurality of keys for energizing
.and locking said relay through one winding there
of to close a signalling circuit including said se
lected source, the other winding of said relayçand
the called line, said relay releasing responsive -to `
60
the called substation answeringr »to disconnect ~
said source from said line.
,
8. In a telephone system, a called party `line,
mean-s for establishing a connection to said line,
a plurality of signalling current sources, ’a plu
rality of resistances, a relay, means for selecting>
the proper source to signal the called substa
tion, for selecting a portion of said plurality of
resistances dependent vupon the particular source
a connection between said lines, ‘a source of vsig
nalling current, ‘a relay having a pair of windings,
operator-controlled means Tor completing the cir
cuit of one winding ci’ said relay for causing said
selected, and 'for operating said relay in series
relay to operate and close a signalling circuit `in
with
said selected portion of said resistancesto
cluding said source, the other winding of said 70 close a signalling circuit including said selected
relay and the called line, and means effective upon
source and the called line, and means controlled
the response of the called party for releasing said
by the called substation’s response for operating
relay to disconnect said signalling circuit from
said line.
3. In a telephone system, a called. party line,
said relay to disconnect said signalling circuit.
V9. rIn a Y«telephone system, a called party line,
11
2,410,866
means for establishing a connection to said line,
a plurality> of signalling current sources, a plu
rality of resistances, a relay, means for selecting
one of said sources to signal a party on said line,
for selecting a portion of said plurality of re
sistances dependent upon the particular source
selected, and for closing a circuit for said relay
in series with said selected portion of said resist
ances, a signalling circuit closed by the opera
12.
with said selected portion of said resistances, and
a signalling circuit closed by the operation of
said relay and including said selected source, said
relay and the called line.
14. In a telephone system, a called party line,
operator-controlled means for establishing a con
nection to said line, a plurality of signalling cur
rent sources, a plurality of resistors, a plurality
of keys for selecting one of said sources to signal
tion of said relay, said signalling circuit including 10 a party on said line, and for selecting one or
said selected source, said relay and the called
line, and means eiîective upon the response of the
called substation for releasing said relay to dis
more of said resistors to form a resistance of
certain value a relay, a circuit controlled by any
one of said plurality of keys for operating said
relay in series with said selected resistor or re
10. In a telephone system, a party line, means 15 sistors, a signalling circuit closed by the opera
for extending a connection to said line, a plural
tion> of said relay and including said selected
ity of signalling current sources, .a plurality of
source and said line, and means controlled by
resistances, a differentially-wound relay, means
the called substation’s response for operating said
i'or selecting the proper source to signal the called
relay to disconnect said source.
substation, for selecting a portion of said plu
l5. In a telephone system, a party line, means
rality of resistances dependent upon the particu
for extending a connection to said line, a plu
lar source selected, and for energizing said relay
rality of signalling current sources, a plurality
through one winding ithereof in series with the
of resistors, a plurality of keys for selecting dif
said selected portion of said resistances, a sig
nalling circuit closed by the operation of said re 25 ferent sources to signal different stations on
said line, and for selecting one or more of said
lay, said signalling circuit including said selected
resistors dependent upon the particular source
source, the other Winding of said relay and the
selected, a relay, a circuit controlled by any one
called line, said relay releasing in response to the
of said keys, a signalling circuit closed when said
called station answering to disconnect said signal
relay is energized in series with said selected re
ling circuit.
30 sistor or resistors over said operating circuit re
11. In a telephone system, a party line, means
sponsive to the operation of one of said keys, said
for extending a connection to said line, a plu
signalling
circuit including said selected source,
rality of alternating `current signalling sources
said
relay
and
the called line, and means effective
including a direct current superimposed on each
upon the called station’s response for releasing
of said plurality of sources, a plurality of re
' said relay to open said signalling circuit.
sistors, a relay, means for selecting one of said
16. In a telephone system, a party line, means
sources to signal a party on said line, for select
for extending a connection to said line, a plu
ing one or more of said resistors to form a re
rality of signalling current sources, a plurality of
sistance of, certain value dependent upon the
particular sour-ce selected, and for connecting 40 resistors, a plurality of keys for selecting dilTer
ent sources to signal diiîerent stations on said
said relay in series with said selected resistor or
line, and for selecting portions of said resistors
resistors, a signalling circuit including said se
dependent upon the particular source selected,
lected source and the called line and closed by the
a
double-Wound relay, a circuit controlled by’
operation of said relay, the alternating current
any one of said keys for energizing and locking
component of said source supplying the power for
said relay through one winding thereof in series
signalling the called substation, and means in
with said selected portion of said resistors, a sig
cluding the direct current component of said
nalling circuit closed by the operation of said
source and controlled by the called station’s re
relay and including said selected source, the
sponse for operating said relay to open said sig
other Winding of said relay and the called line,
nalling source.
`
and
means controlled by the called station an
12. In a telephone system, a party line, opera
swering for releasing said relay to disconnect said
tor-controlled means for extending a connection
source from said line.
to said line, a plurality of signalling current
17. In a telephone system, a called party line,
sources, a plurality -of resistances, means for se
means
for establishing a connection to said line,
lecting the proper source to signal a party on
a plurality of alternating current signalling
said line, and for selecting a portion of said plu
sources including a direct current superimposed
rality of resistances dependent upon the particu
on each of said plurality of sources, a plurality
lar source selected, a relay, operator-controlled
of resistors, a plurality of keys for selectingr dif
means for closing a circuit for said' relay in se
ferent sources to signal diiîerent stations on said
ries with said selected portion of said resistances, 60 line,
and for selecting portions of said resistors
a signalling circuit closed by the operation of said
to
form
resistances of certain values dependent
relay, said signalling circuit including said se
upon the different sources selected, a relay, a cir
lected source and said line, and Vmeans effective
cuit controlled by any one of said plurality of
upon the response of the called party for releas
keys for causing said relay to be energized in
ing said relay to disconnect said source from said
series With a particular selected resistance value,
line. -»
and a signalling circuit closed by the operation
13. In a -telephone system, a called party line,
of
said relay and including said selected source
operator-controlled means for establishing a con
and
the called line, said signalling circuit being
nection to vsaid party line, a plurality of signal
disconnected when said relay releases responsive
ling current sources, a plurality of resistances, a 70 to the called station answering.
relay, operator-controlled means for selecting the
18. In a telephone system, a called party line,
proper source to signal the called substation, for
means for establishing a connection to said line.
selecting a portion of said plurality of resistances
a plurality of signalling current sources, a plu
dependent'upon the particular source selected,
rality
of resistances, a differentially-wound relay,
and for closing a circuit for said relay in series
connect said source.
75 a balancing circuit including one winding of said
2,410,866
13
relay, means for connecting diiîerent ones ofsaid sources to said line through the other wind
ing of said relay to signal diiîerent stations on
said line, and for connecting diiîerent values of
resistance in series with said balancing circuit to
compensate for different sources connected to the
other winding of said relay.
19. In a telephone system, a party line, means
for extending a connection to said party line, a 10
plurality of signalling current sources, a plural
ity of resistances, a differentially-Wound relay,
a balancing circuit including one winding of said
14
relay, means for connecting any of said sources
to said line through the other Winding of said
relay to signal a party on said line, and for con
necting the proper value of resistance in series
with said balancing circuit for providing the
proper power in the balancing circuit winding of
said relay to neutralize the power developed in
the other winding of said relay when the called
`party answers, said neutralization causing the
release of said relay to disconnect said source.
KARL L. BURGENER.
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