US1653790A

US1653790A - Automatic telephone system

Info

Publication number: US1653790A
Application number: US78184A
Authority: US
Inventors: David L Temple
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1925-12-29
Filing date: 1925-12-29
Publication date: 1927-12-27
Anticipated expiration: 1944-12-27

Description

Dec. 27, 1927. 1,653,790l

Y D. L. TEMPLE AUTOMATIC TELEPHONE SYSTEM Filed Deo. 29, 1925 s sheets-'sheet 1 Q m Q" gf L v \a I| di l;

- Bee; 27, 1927. 1,653,790.

D. L. TEMPLE AUTOMATIC TELEPHONE SYSTE Filed DGO. 29, 1925 3 Sheets-SheffL 2 Patented Dec. 27, 1927. y 1,653,790

lUNITEDSTATES vPivriaziirr OFFICE. i

:DAVID L. TEMPLE, OF FLORAL PARK, NEW' YORK, ASSIGNR T0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEWv YORK, N. Y., A CORPORATION OF NEW YORK.`

AUTOMATIC TELEPHONE SYSTEM.

p Application led December 29, 1925. Serial No. 78,184.

This invention relates to a simplified trunk or line circuits disclosed in Figs. 4, method of supervision in telephone systems or 6 by means of the cord circuit disclosed in but more particularly to cord circuits. Fig. 3. Figs. 1 and 2 are arranged to give 50 Heretoifore, supervision has been provided supervision on the answering end ot the 5 by means of lamps controlled by relays locord circuit in Fig. 3 and the trunk and line cated in the cord circuit under control of circuits of Figs. 4, 5 and 6 are arranged to other relays in the trunl or line circuits with give supervision on the calling end of the which the cord is used. A feature of this in- `cord circuit. Jacks 315 and 316 are pro- 55 vention is that the relays in the cord circuit vided for connectingan operators telephone 30 are eliminated and the supervisory lamps are headset to cord C. A

controlled by means of a double Wound A clearer conception ofthe operation and sleeve relay in either the trunk or line cirthe features of the invention maybe ob cuit, one Winding of which is shunted in and tained from the following detailed desciip- 60 out of circuit by the line relay, the shuntedl tion. vWhen a selector, such as isdisclosed in Winding being of such a resistance that the "the patent to R. L. Stolely No. 1,474,008

lamp will be extinguished when the shunt is issued November 13, 1923, selects the trunk removed. circuit ST a circuit is closed from ground It is the object of this invention to provide through the right Winding of relay 101, up- 65 improved vand simplified supervisory circuits per back contact of relay 104, conductor 110, 2l for telephone exchange systems. through they selector, back over conductor A feature of this invention is the use of a 111, lower bacl; contact of relay 1041 to bats toneunder the control of a cord circuit key Vtery through the left `Winding of rela-y 101. to notify the operatorthat the called sub- Relay 101 operates and closes an obvious cir 70 scriber has answered and that the key has cuit for relay 102. Relay 102 operated lights not been released. lamp 121 over a circuit from battery through A clear conception ott-he invention may be the outer right front. contact of relay 102. had Vtrom the drawings and description in inner left back contact of relay 105,` to which: Y ground through lamp 121. Relay 102 also Fig. 1 discloses a trunk circuit incoming connects tone current from source `123 from selector bank arranged for coin collect through lamp 106, right back contact of reand refund. lay 105, inner right frontI contact of relay 102 Fig. 2 discloses a trunk circuit incoming to conductor 111 and thence over the ring "from a connector bank. side of the line to the calling subscribers Fig. 3 shows an operators cord circuit line. Relay 102 at its lett contact alsok embodying the teaturesot this invention. `grounds the sleeve conductor 112 of the Fig. 4 shows a trunk circuit for repeating trunlrto mark the trunk busy and holds the the pulses from the dial in the operators precedingselector switches operated. The cord circuit to a selector circuit. operator, noting lamp 121 lighted, inserts the 85 Fig. 5 is a rural subscribers line circuit plug 320 oi cord Cin the jack 120, thereby with common battery supervision. v operating relay 105 over a circuit from Fig. 6 discloses a rural subscribeus line ground through the windingsk of relay 105, circuit with magneto supervision. sleeves of jack 120 and plug 320 to battery Y Thetrunk circuit disclosed in Fig. 1 is through lamp 321. The resistance ot the 90 used with a step-bystep selector circuit and 'windings of relay 105 in series is such that 15 is arranged for collection or refund oit coins lamp 321 will not light. `The operation of at the calling subscribers station. This relay opens the circuit for lamp 121211:

trunk may he connected to any one et? the inner left contact and also riiioyes iik relay 309 in a manner Well known in the art.`

The `operation of relay 309 closes an obvious circuit through coil 312 and the lettjvinding of tone coil 310 thereby giving the operator a busy click in her headset which is plugged up in the jacks 315 and 316.` Y

lNe will assume, however, that the trunk `DT is idle. The operator then inserts the plug 330` into joel; 410 therebyioperating relay 403, trein battery through lamp 331,

sleeves of plug1330 and jack 410l through the right Winding of relay 403 to ground on the back contact ol relay 405. The operation of relay 403 closes a circuit for operating relay 404 i'roin ground on the lett contact or' relay 403, outer right norinal Contact ot relay 402, to battery through the winding of relay 404.

The trunk circuit DT is non7 `in lcondition tor Y dialing. The operator throws dialing key 303 and connects conductors 317 and 313 to the tip andring leads, respectively, of the cord circuit. Relay 401 is also operated `ove a circuit 'troni ground on Contact `322 fof dial 306, conductor 317, inner upper alterv nate contact of key 303, tips of plug 330 and jack 410, contact 417 of relay 412, contact Ll l) 419 of relay 401, to battery through the Winding of? relay 401.V Relay 401 operated

closes conductors

413 and 414

throughto conductors

420 and 421` whichV are connected to a :"atepby-"step selector (not`shown)'. Re lay 401 locks under control` "of` relay 403 which is under control of the cord circuit C. Relay 402 also operates at this time from ground through resistance 327, outer lett contact ot relay 303, Yconductor 313, lowerinost alternate contact of key 303, rings of y'plug 330 and jaclf410, contact 413 of relay 412, to battery through the lett Windingot relay 402. The operation of relay 402 closes a new.operating circuit -for relay 404 from ground on contact- 322 oi dial 306, conductor 317, tips of cord 330'and jack 410, contact 417 ot relay 412, right outer front contact `021i relay 402, to battery through the Windingoi' relay 404,and short circuits at its lett contact Vthe relay 405 thereby reducingl the impedance of the bridge across the trunk conductors. Y

lVhen the operator operates the dial 306, relay 404 .follows the impulses and opens and closes a bridge across

trunk conductors

420 and 421 extending through contacts of

relays

402 and 404. This in turn controls the 0p- `scribcr has answered;

eration of the selector switch in a manner Well known in the art. lWhen `dial 306 was moved oli normal the alternate contact ol' spring 307 was closed thereby operating rclay 303 over a circuit trono battery through the lett winding ot relay 402, contact 413 of relay 412, rings of jack 410 and plug 330, lower alternate contact ot' dialing lrcy 303, conductor 313, alternate contact of spring' 30T of dial 300 to ground through the righi` winding oi relay 303. Relay 303 operated, loclts in an obvious circuit to ground on the uppermost alternate contact of key 303."` The operation of relay 303 disconnects resistance 327 `trono conductor 313 and prepares an operating circuit for relay 313. Relay 313 does not operate at this time as its ciri cuit is not complete. Upon the completion of dialing relay 402 deenergizes.

lllhen the desired line has been selected and the called subscriber has answered, re versed battery currentis transmitted `over

trunk circuit

420, 421 in a manner Well known in the art and polarizedrelay`405 operates, in turn operating relay412 over an obrious circuit. Relay-412 operated con neets conductors `413 und 414 through to the tip and ringr olf jack 410. Be- `tore battery was reversed in the selector cir cuit, V`ground was connected to conductor `420 and battery to conductor 421. `When the battery was reversed, the ground which is now connected to conductor 421 Willoperate relay 313, if the operator has not re stored the dialing key 303. Relay 313opcrates over a circuit 'troni ground on conductor 421, lower contact` ot' relay 401, conductor 414, contact 410 of relay 412, rings o1 jack 410 and plug 330, lower alternate contact of key 303, conductor 313, normal contact of spring 30T olf dial 30G, right iront contact of relay 303 to battery through the Winding ot relay 313. The operation ot `rclay 313 connects a tone through coil .311, to the operators headset notifying her that the dialin key 303 should be restored. Relay 313 releases `when the` dialing` hey is restored thereby cuttingoli the tone. The operation of relay 405 also removes thc shunt from around the lett Winding oi? relay 403 thereby 1 inta-easing the resistance ot' the circuit tln'ough la1npl33l, and extinguishing the lamp aa anindication 'that the called? faul Sliouhl` the call be from a coin box line. the oiierator operates coin collect ltey" 113. The operation oll key 113 operatesrelay" 104 over an obvious circuit and connects coin collect current to conductors 1l0 and 111., from coin collect source 116 through the winding oi relay 11T, lamp resistance 110, alternate contact (dltey '113. through both aiernate contacta of relay 104 to conductors 110 and 111.

It the call for a party 'for which a charge is not to be made, there is no battery directly lll reversal over

trunk circuit

420, 421. There `tore, lamp 331 `will remain lighted. When be refunded and refund key 109 is Operated,

operating relay 1L over an ohviousclrcuit. Relay 101 connects coin refund source 1111 through the Winding ot relay 113, lamp 108, alternate contact ot' key 109, contacts oi relay 104. to conductors 110 and 111.

When the called subscriber replaces the receiver on the switchhool, relay l105 is released thereby connecting. a shunt around the" lett Winding of relay 40S, allowing lamp 331 to light as a disconnect signal. This. is only true on a call through a station for which a charge is made. It the call is from a no-charge line, the operator listens in for the subscriber to hang up at which time she withdraws plug 330 from j acl;r L110. The release ot relay L105 also opens the circuit ot relay 411.2 vopening the talking conductors. lill/Then the operator withdraws plug 3320 from jack 410, relay 403 also releases in turn releasing relay 4101 and restoring the circuit to normal. When the calling subscriber replaces the receiver on the sivitchhoolnrelay 101 releases. thereby connecting a shunt around the right Winding ot relay 105 `trom ground `on the back Contact ot relay 101. This shunt removes resistance from the sleevecircuit and allows lamp 321 in the cord circuit to light as a disconnect signal. The release of relay 101 also opens the circuit 'tor relay 102 which releases and removes the busy ground from the sleeve 112. The trunk circuit ST new restores to normal, releasing the selector which extended the calling line into connection with the, trunk. y y

call incoming over `a trunk such as `CT troni a connector' circuit and outgoing'to a coinnion battery line circuit ivill nent be considered. `fl/'hen a connector such as disclosed inthe patent to R. L. Stokely above referred to seizes terminals connected to

conductors p

210, 211 and 212, ringing current will be connected to relay 201 causing it to operate and in turn operate relay 202 from ground on the inner contact of relay 201, lett contact of relay 201 to battery through the Winding` oit relay 202, Relay 202 is heldoperated to ground on the sleeve conductor 212 over its right front contact. lhe operation ot relay 202 lights lamp 221 over fan obvious circuit. Lamp 221 is an indication to the operator ol an incoming call. The operator then inserts plug 320 into jack 220 which is associated with lamp 221 thereby operating relay 204; over a circuit from battery through lamp 321, sleeves of jack 220 and plug 320, lett Winding ol" relay 20e to ground on the baci; contact ot relay 203 and the outer front contact of relay 201. The right Winding of `ductors 520 and 521.

relay 204 is shunted by ground on theback Contact ot' `relay 203; Theoperation of relay 204 connects relay 203 across

conductors

210 and 211 thereby operating the ringing trip relay in the connector. rEhe removal of ringing current releases relay 201 andoperates relay 203 trom battery in the connector. 'lhe operation ot relay 203` and the release ot relay 201 removes the shunt from around the right Winding ot relay 2041 thereby extinguishing lamp 321. Relay 204 also connects holding ground to conductor 212 over the hack contact ot relay 202and the inner front contact o1"- relay 20a, for the purpose ot holding the connector. y 1

The operation ol cord circuit G is the saine as described above until plug 830 is inserted in jack 510. llt this time, relay 503 Will operate from battery through lamp 831, sleeves oic plug 330 and jack 510, lett Winding of relay 503 to ground at the right contact of relay 502. Relay 508 operates and f lamp 331 lights Ringing current and ground are connected to the tip and ring of cord C by the operation ot' ley 30d, and relay 504 operates in turn operating relay 505 which cuts the line relay 501 oli1 of the line. The ringing current also rings the bell at the called station.

'lr/'heu the operator releases the ringing hey 'B0-1 relay 504 releases restoringl relay 505 which connects line relay 501 across conl/Vhen the called suhscriher at station 5112 answers, relay 501 operates from battery through its lett Winding, right bach Contact ot relay 505, conductor 521, subscribers station 512, conductor 520. lett back contact ot relay to ground through the right windingot relay 501. litelay 501Joperated, operates relay 502 over an obvious circuit. The operation ci relay 502 removes 'the shunt troni around the right Windingl oi relay 503 extinguishing lamp 331 as an indication that the subscriber has answered. Should the subscriber flash the switchhoolr. relay 501 will follow the switch hook in turn operating and releasingrelay 502 `which will open and close the shunt around the right Winding ot relay 503, causing lamp 331 to flash as a signal to the operator.

When the called party replaces the -receiver on the sivitchhook, relay 501 will release in turn releasing relay 502 Which Will replace the shunt around the right Winding of relay 503 causing lamp 331 to light as a disconnect signal. When the operator with* draf's plug 330 from jack 510. relay 503'ivill release and restore the circuit to normal.

`When the calling subscriber replaces the receiver on the sivitchhook, the intervening switches will release except the connector which remains operated until the operator withdraws'plug 320 from jack 220 opening the circuit of relay 204. The releasevot relay 204 opens the circuit for relay 203 and releases the connector.

Ironia call from a toll board the toll opi Tof trunks ST or GT through the cord C to the magneto linek circuit ML. The operation of the two trunks and the cord circuit is the same as described above until plug 330is inserted in`jack 610. At this time relay 602 operates from battery through lamp 331.

sleeve of plug 320, sleeve oi j ack 610, wind;

ings of relay 602 to ground. Lamp 331 does not light but relay 602 operates. The operator now operates ringing key 304: which closes a circuit from ground on its upper alternate contact, upper normal contact of dial key 303, tips of plug 330 and jack 610, winding of relay 601, rings of jack 610 and plug` 330, lower normal contact of dial key 303, the lower normal Contact of key 3041 to ringing source 302. Relay 601 operates and places a shunt across the right winding of relay 602 allowing lanip 331 to light.. The operator after ringing the called subscriber releases the ringing key and throws the talk ing key 305. to listen for the response of the called subscriber. When the ringing key is released, relay601 is releasedin turn removing the shunt from around the right winding of relay 602 extinguishing lamp 331. `ihen the called subscriber rings oit", relay 601 again operates shunting the left wind ing of relay 602, causing lamp 331 to light asv an indication to the operator that the called party has disconnected. When the plug 330 is removed from jack 610, the operated relays release yrestoring the circuit to normal.

`When the subscriber at substationv 512 initiates a call, relay 501 operates over the back contacts oi cut-ott relay 505 and the line loop and. closes an obvious circuit for relay 502. Relay 502 in turn closes a circuit over its lett contactand the back contact of relay 503 for lamp 511. noting the illumination of lamp 511 inserts plug 320 in jack 510 thereby causing the operation ot' relay 503 in series with lamp 321. Relay 503 operating opens the circuit ot lamp 511 extinguishing it. Since relay 502 is` at the time energized the shuntaround the right winding of relay 503 is open and the full resistance of relay 503 is inserted in the circuit of lamp 321 whereby lamp 321 is not lighted.

It' the subscriber at station 622 initiates a call by operating his magneto, relay 601 operates closing a circuit for relay 603 from The operator `neaefrco battery contact of relay 602, winding of re-` lay 603to ground at the left contact of re lay 601. Relay 603 upon operating locks to ground over its right Contact and at its left contact closes a circuit for lighting lamp 611, extending from battery at the contact ot `relay 602, left contact ot relay 603 to ground through lamp 011.` The `operator noting the illumination oi lamp 611 inserts plug 320 in jack 610 thereby causing `the operation otrelay 602 in series with lamp 321. Relay 602 operating opens the circuits oi relay 603 and lamp 611. Lamp 321 does not light, as following the release of rela 601 when the subscriber ceases ringing, bot windings of 'relay 602 are inthe circuit of lamp 321.

W'hat is claimed is:

1. In a telephone system, a cord circuit, a

aline, a signal lamp ij'or said line, a ring down relay for said line, a double wound cut-utf relay, a third relay controlled by said ring down relay, a circuit for said lamp extending through contacts of and controlled by said cut-oil' relay and said third relay, a supervisory lamp in said cord circuit, a circuit for said latter lamp extending through both windings ot' said cut-oil relay, the resistance ot' said winding being such that said supervisory lainp does not light, and a shunt for one winding of said cut-oii relay controlled by said ring down relay whereby said supervisory` lamp becomes lighted.

2. In a telephone system, a cord circuit, a line, a ring down relay for said line, a double wound cut-oli' relay, a supervisory lamp in said cord circuit, a circuit for said lamp yextending through both windings of said cut-oit relay, the resistance of said windings beingsuch that said lamp does not light, and a shunt adapted to be closed through a contact of said ring down relay for shunting one winding of said cut-oil' relay Whereby said lamp becomes lighted.

3. In a` telephone system, a cord circuit, an operators telephone circuit, a called line, a key, a tone source for indicating to the operator the failure to release the key after the called station has answered, a relay under control of said key for connecting said tone source to said operators circuit, and means under control ot the called station for causing the operation of said relay until said key has beenreleased. y

4. In a telephone system, a cord circuit, an operators telephone circuit, a called line, a key in said cord circuit, a tone source for indicating that the key has not been released after the called station has answered, a relay under control of said key, and a second relay under control of the called station and of said iirst relay unless said key has been released for connecting said tone to said op erators circuit.

the joint control of said key and of said apparatus for connecting said tone source to 10 said operators circuit.

n Witness whereof, I hereunto subscribe my name this 26th clay of December, A. D. 1925.

DAVID L. TEMPLE.