US1200829A - Telephone signaling system. - Google Patents

Description

C(L. GOODRUM.

TELEPHONE SIGNALING SYSTEM. APPLICATION FILED NOV. 7, 1914 1,200,829. Patented 'Oct. 10,1916.

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'M (/mr/es L. 6004/11/71.

I v by W UNITED STATES PATENT OFFICE.

' CHARLES L. GOOIJRUM, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO

WESTERN ELECTRIC COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

; TELEPHONE SIGNALING SYSTEM.

Patented Oct. 10, 1916.

Application filed November 7, 1914. Serial No. 870,806.

To all whom it v m'zg concern:

Be it known that I, CHARLES L. Got oRUM,

' acitizen of the United States,'residing at tion of ringing current to the called.sub scribers line by means of a switch or key which can be readily controlled by thecall ing subscriber in the transmission of code ringing impulses. I

' A'further object resides in means to prevent the application of ringing current to v the called subscribers line when the calling. subscriber hangs up his receiver. I With the above object in View, the appllcation of ringing current to the called partys line is under the control of a slowacting ringing relay, the circuit of which is controlled by a second slow-acting relay which in turn is controlled by a slow-acting release relay, whose circuit-in turn is under control of a line relay. The circuit of the line relay is controlled by an interrupteractuated by the calling party. The calling party may, therefore, by operating his interrupter, cause the line relay to vibrate and thereby apply-ringing current-to the called partys line. g

The several features of the invention may be more readily understood by reference to the accompanying drawing which is a dia gram of so much of a two-wire automatic telephone system as is deemed necessary to an understandin of the invention.

The calling su scribers station A and the called subscribers station B may be connected to each other in the usualwell-known manner, such connectionbeing under the control of the dial 1 at the station of the calling subscriber. By lifting his receiver and actuating thedial, the called subscriber controls the operation of the'finder 2 and the connector 3, thereby connecting the two limbs 4 and 5 of the calling subscriber s line with the limbs 6 and 7- of the called subscribers line. The applicationof ringing current tothe called'line is dependent upon the vibration of a line relay 8-,,the circuit of which may be traced as follows: from the grounded battery 9, through one winding 10 of the line relay 8, the limb 5 of th e telephone line, telephone book 11, the interrupter dial 1, the other limb 4 of the telephone line, winding 12 of the relay 8, to ground. After the calling party has operatedthe dial to select the line wanted, he may give it another turn, thus sending a ser es of impulses which causes the relay 8'to vibrate and thereby to cause ringing current to be applied to the line of the called party in the manner to be hereinafter described.

The impulse transmitter inay be satisfactorily used for ringing purposes when the oflice contains no party lines on which code ringmg is essential. However, when code ringing is desirable, the use of the impulse transmitter is unsatisfactory, whereas a key of the push button type can be used to the very best advantage. A key of this type makes it possible for the subscriber to properly cons trol the longand short rings ordinarily usedin code ringing. 1

.The relay 8 has a front contact 13 an'd a back contact 14. hen said relay is energized, thereby closing its front contact 13, a circuit is closed for a slow-acting relay 15 as follows: from ground, through contact 13, relay 15, to one pole of the grounded battery 9. This causes the relay 15 to close its contact 16. Relay 15 being ofthe slow release type, maintains its contact 16 closed during the time that the line relay 8 is vibrating. The contact 16 is in the circuit of a second slow-acting relay 17, the circuit of which ,may be traced as follows: from grounded battery 9, through relay 17,-contact 16, contact 14, closed in the released position of the relay 8, to ground. Relay 17 being likewise of the slow release type, maintains its contact 18 closed during the time the 1 line relay 8 is vibrating. The contact 18 is in the circuit of a slow-acting ringing relay 19, the circuit of which may be traced as follows: from the grounded battery 9, through relay 19, contact 18, contact 13, closed in the actuated position of the relay .8, to ground. The relay 19 controls the application of ringing current to the called line, the circuit therefor being traced as follows: from the generator 20, through contact 21 of the ringing relay 19, one limb 6 of the called partys line, the bell 22, the other limb 7 of the called partys telephone .line,

-. .Since the relay 17 is of theslow releaserype,

' during thevvibration of the, line relay 8.

contact 23 of the ringingrelay 19 to ground.

its contact 18 remains closedduring the v1-v bration of the line relay 8, and since. the ringing relay 19 is of the slow release type. its contacts 21 and 23 likewise remain closed Therefore, when the subscriber, by meansof an interrupter, sends a series of impulsesover the hue 4'--5, he thereby causes ringing current to be impressed upon the line 67.

[As hereinbefore stated, the subscribers dial' 1 maybe used as an interrupter for causing the vibration of. the line relay 8. However, in certain cases' it is preferable to employ another'an d independent interrupter .for thispurpose. In the preferred form of thisinvention, therefore, an electromagneti' cally actuated interrupter is provided, such interrupter comprising the slow-acting elec- .ti-Omagnet 24 and its contact 25 which are in serie's with one-limbof the calling subiscriberistelephone line. -This electromag- 1 neticallyactuatedv interrupter is normally 25 adapted to be manually operated by the calling subscriber, as, for example, by the actuation of-a push-button'27. It thus appears that the calling subscriberby pressing upon the button 27removes the short-circuit from the electromagnetically actuated interrupter, and the circuit is, during such oper:

short-circuited by a switch 26 which is p ation of the switch 26, opened and closed at .contact 25, thereby applying intermittent 3 current to'the relay 8,'an d causing the applicationof ringing current to the line of 1 the called party in the manner hereinbefore" described. -Itwi1l be-noted that so long asl the button 27 is actuated, ringing current is applied to the called line. The electromagnetically actuated interrupter, ,therefore,,

provides a convenient means for code ring ing. e v v g This invention provides a simple arrangement of circuits and apparatus for placing the ringing of thef'called subscriber under the direct'control of the callingsubscriber.

' Itwill be noted that the circuit arrangements are such that-when the calling subscriber is connected to the line it requires a it make and break 'of the calling line circuit before ringing current is applied to the called subscribers line. Thus when the calling subscriber is connected for service and line relay 8 is energized, the slow-acting relay-15-is also energized. An interruption of the line circuit causes the deenergization of the line relay 8 whereas the slow-acting I relay 15 will remain energized and the circuit completed by the armature of the deenergized line relay and the armature of the energized slow-acting relay 15 will ener gize and operate the slow-acting relay 17. A subsequent closure of the line circuit will then reenergize the line relay 8end the relays a circuit closed in the actuated said second slow-acting relay.

15 and 17 being slow-acting, will likewise be energized and a circuit will now be completed through the slow-acting ringing relay 19 by way of the armaturev of the slowacting relay 17 and the front contact and armature of the line relay 8.

current can be applied to, it called subscribers line. This is of-considerable advantage in preventing the application of'ringing current to the calling subscribers line when The foregoing description Will makedt evident thata make and breakof the can w cuit' is absolutely essential before ringing the subscriber has the receiver'ofi the-hook.

Thus, in case it were possibleto energize the ringing relay by simply breaking the line circuit ofthe; calling subscriber, then if f the calling subscriber were tohang up his receiver before the called subscriber, the j I latter would receive the rin'ging current in hlS receiver, due to the energizatlon of the advantage, and the second slow-acting relay 17 wasincluded this circuit to overcome this operating systems. p p What is claimed is:

' 1.- In a signaling system, the combination of a calling subscriber s line, a line relay controllable over said line, an impulse sending device operated by. the calling subscriber detect existingin previous ringing relay. This would be a serious 'dis for controlling said relay, a slow-acting re 1 lay under the control of said line relay, a' second slow-acting relay under the control of said first mentioned slow-acting relay anda ringing relay alwaysunderthe joint control of said scond slow-acting relayand a calling subscribers substation apparatus.

, 2. In a signaling system, the combination-of a line relay, an interrupter for ca using said line relay to vibrate, a slow-acting relay having a circuit closedin the actuated position of said line relay, a second slowacting relay'having a circuit closed in the actuated position of said first-mentioned slow-acting relay, and a ringlng relay having posltlon of 3. In a signaling system, the combinatlon of a calllng subscrlbers line, a line relay controllable over said line, an impulse send ing device, operated by the calling subscriber for controlling said relay, a slow-acting relay having a circuit including the front conrelay.

having a circuit including the front contact of. said line relay, a' second slow-acting relay having a circuit including the front contact of said first-mentioned slow-acting relay and the back ,ontact of said-line relay, and a ringing elay having a circuit including the front I ntacts of said line relay and said secon slow-acting relay.

5. n a telephone signaling system, the combination with a telephone line, of a line relay, an electromagnetically actuated inter: rupter'in one limb of thetelephone line, a manually operated switch in shunt of said interrupter, a slow-acting relay under the control of said line relay, a second slowracting relay under the control of said first-mentioned slow-acting relay, and a ringing relay under the control of said second slow-acting.

6. In a telephone signaling system, the

' combination with a telephone line, of a line .relay, an electromagnetically actuated interrupter in one limb of tl1e telephone line, a manually operated swltch in shunt of said interrupter, a slow-acting relay having a circuit closed in the actuated position of said line relay, a second slow-acting relay having a circuit closed in the actuated position of said first-mentioned slow-acting" relay, and a ringing relay having a circuit closed in the actuated position of said second slow-acting relay.

relay, an electromagnetically actuated interrupter in one limb of the telephone line, a

manually operated switch in shunt of said interrupter, a slow-acting relay having a c1rcuit including the front contact of said line CHARLES L. GOODRUM.

Witnesses: V

E. EDLER, K. L. STAHL.

7. In a telephone signaling system, the combination with a telephone line, of a line

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