US1195163A - Convertible ringing control for telephone systems - Google Patents

Description

6. 0. WULF. CONVERTIBLE RINGING CONTROL FOR T ELEPHONE SYSTEMS. APPLICATION FILED SEPT. 20. 1913.

I, 1 ,1 95, 1 63. Patented Au 15, 1916.

2 SHEETS-SHEET I.

i 2/ 227525555: Jim/E2775 I G n; WOLF. CONVERTIBLE RINGING CONTROL FOR TELEPHONE SYSTEMS.

APPLICATION FILED SEPT. 20,1913- 1,195,163. Patented Aug. 15, 1916.

2 SHEETS-SHEET 2- Z 27 7 5555: jz'zuezvifin GEORGE n. oL IoEc Ic eo, rumors,assiolvon'rofkErLoed-swlronnoannfAND f SUPPLY COMPANY, or CHICAGQILLINQIS,,AQORPORA'IION orrnnmo slj CONVERTIBLE imvcme CONTROL FOR TELEPHONE sYsTEMs. e

To all whom it may concern Be .it known that I, GEORGE'D. Worm, a citizen of the United States of America, residing in Chicago,'county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in "Convertible Ringing Control for Telephone Systems, of which the following is a specification.

My invention relates to'telephone systems '10 and is directed more particularly to alternative methods for controlling the application of ringing current. That is-my invention looks more to a ringing system which may be readily converted from automatic to manual ringing, an object of my inventionbeing to provide a simplified circuit arrangement of this character which is alsopositive and xyetlicient in operation.

In telephone systems wherein automatic 2o ringing is provided and wherein constantly operating mechanism is provided, such as, an interrupter, although during the day service when a great many connections are being established such automatic ringing is an opk crating advantage, nevertheless during times when few connections are being established a ers lines, I have provided animproved cord,'

circuit arrangement in whiclrnieans areiprovidedso that the moment ringing" key" 40 plunger 18 depressed (whenthe cord circuit is'used for automatic r nging),-rmgmg curing end of the cord circuit, no matter in what position the interrupter mechanism may be in. The interrupter mechanism thereafter operates to "intermittently apply ringing current to the said line; By so arranging the cord circuit, that is, by prouidfing it with the above described so-called preliminary ring, I have saved a great deal of time in the average time that it takes! I iternate position. When a rmgmgplunger from the moment that the ringing key plunger is depressed until the called subscribers bell is first operated. a I For a better understanding of my inven- Specification of Letters Patent.

tion reference will be had to the accompanycontacts 3,4, 5, or. 6 are Patented Application filed September 20, 1913. Serial No. 790,814

ing drawings in which like reference char;

acte'rs indicate like parts and in which- Figure 1 illustrates a telephone, system'l having two-conductor line and cord circuitsv 6 0 embodying my invention; and Fig. 2 illus-I 'trates as telephone system of the so-called; three-conductor type, and which embodies,

my invention; v. H Referring now more particularlyltoth system illustrated in Fig.1, it comprises fa, call ng substation A and-called substation; connected to line circuits C and, D respecl tively. A cord circuit E ifor interconnect mg said lines is provided, said lineand acid? clrcuitsbemg of the two-conductortype, An" answering supervisory relay AS is provided: at the answering end of the cord circuitfandi s adapted, when the answeringe plug '1 is msertedinto a jack of the calling line, 7.5, .ll

automatically connect an operators phone 0 in circuit With the cord.

In connection with the callingendof circuit E, I have provided a calling plug 2 and a so-called switching relay SW, which; 89. A

may also be called a supervisoryv control re; lay, said relay S W being adapted to be ener if gized when the calling plug 2 is inserted into the jack of a called line whereb'y the op erators telephone 0 is operatively. di'scbn'f 8,5 nected from the cord. A calling supervisory relay CS, sometimes referred to as a tip re-J lay, is also providedbeing adapted to be en ergizedwhen a response is secured front the, called, substation, to controlthe supervisory: 9Q

signal and the automaticringing circuit.

' A ringing key 'RK is also providedbeing preferably of the type having ringing'and indicating positions andcomprising agpl urality of independently operablejringing 9 5. contacts 3, 4, 5, 6, together With'a set, if

rent is automatically connected to the'callcommon contacts 7, 8. When a plungeris taming the ringing contacts in theIr'al is-depressed, the slow acting disconnect re; lay DR its-energized and maintained 'ener: gized wherebya-ci'rcuit for interrupter relay IR is established from the interrupter I. This efi'ects an intermittent energization of the interrupter relay IR to periodically apply ringingcurrent according to the actuated plunger. When the called subscriber responds, relay CS operates to interrupt the locking circuitior relay DR whereby the ringing current is disconnected. When it is desired to use the automatic ringing control, the switch S, which may be common to a plurality of cords, is moved into its dotted position but when the manual control is desired switch S is moved into its open position. Thus, when manual ringing is de sired, switch S being in its open position, no circuit is established from the interrupter for the interrupter relay IR but each time ,a ringing plunger is fully depressed so as "to actuate common contacts, 7, 8, relay IR operates to apply ringing current. hen the subscriber answers, relay CS operates to restore the disconnect relay DR as before thereby establishing the continuity of the talking circuit, but of course in this instance it does not effect the interrupter relay IR. In connection with the ringing apparatus I preferably employ ringing generators of different frequencies using call bells at the substations corresponding to the ringing.

generators employed.

Referring now more in detail to the operatlon of the system of Fig. 1, upon the removal of the receiver at calling substation A, line relay LR is energized to light the calling signal 9 in the usual manner whereby the operator will insert an answering plug 1 into a jack 10 of the calling line. This connects the cutoff relay CO and impedance coil 11 in series to energize said relay CO. Therefore the calling line is connected in circuit with the answering end of the cord circuit E and a circuit for answering supervisory relay AS is established traced from battery through the winding of 11 over the calling line and returnin through the wind ing of AS to ground. Relay AS therefore interrupts its normal contact 12 to open the circuit of signal 13 and upon the closing of alternate contacts 14, 15, of AS, the operators telephone 0 is connected over conductors 16, 17, and through normal contacts 18. 1!), to the cord circuit conductors.

The operator now ascertains the wants of the calling subscriber and finding that connection is desired with the line of substation B, a jack 20 of the called line is tested in the usual manner to determine its idle or busy condition, and finding that said line is idle-the operator inserts the calling plug 2 into the jack. A circuit including switching relay SWV and cut'oif relay CO is therefore established causing the energization of these relays whereby opera tion of CO extends connection from the plug 2 to substation B and removes the normail control of its line relay LR". Responsive to energization of SW, its alternate. contact 21 is closed establishing a circuit for supervisory signal 22 over the normally closed contacts 23, while the interruption of normal contacts 18, 19, of SWV disconnects the-operato1"s telephone 0 from the cord. Furthermore the interruption of normal contact 24 of SW disconnects the test conductor 25 and by closing of alternate contact Qiestablishing the continuity of the tip strand.

Assuming now that the automatic ringing control is in service and the switch S is in its closed or dotted position, upon the operator depressing the proper ringing key 3, 4e, 5, or'6 to its fully actuated position, alter natecontacts 7, 8, thereof are closed. The closing of alternate contact 8 establishes an energizing circuit for relay DR traced from battery through the winding thereof, alternate contact 8, conductor 26, normal contact 23, and alternate contact 21 to ground. At the same time alternate contact 7 is closed connecting the said grounded conductor 26 in circuit with the interrupter relay IR and whereby its alternate contacts 27, 28, are closed connecting ringing current to the called line. This connection of ringing current to operate the call bell of the called subscriber as just described may be termed a oreliminar T rin and is a )lied innnediatel upon the depression of a key plunger to a fully depressed position due to the momen tary closure of the end spring 7. Should the operator hold the depressed plunger in its fully actuated position for a short time the call bell of the called subscriber would be continuously rung until the .key plunger is allowed to restore to its indicating position at which time the interrupter mechanism is connected in circuit to bring about the intermittent application of ringing current to the call bell of the called subscriber as will now be described. Upon energization of DR, its alternate contact 29 is closed establishing a locking circuit for DR through normally closed contact 23 of the supervisory relay CS and the grounded alternate contact 21. Therefore, although the initial energizing circuit'for DR is interrupted at alternate contact 7, when the operator removes the pressure upon the actuated key, relay DR remains energized and therefore an intermittent energization ofinterrupter relay IR is eliected by current from battery through the winding. of IR, normal contact 7, alternate contact 30, switch S'and interrupter I to ground. Relay IR therefore is alternately energized and de'c nergi'zed, alternately connecting ringing current and supervisory relay CS in bridge of the called line. During the application of ringing current, it will be noted that the talking conductors of the COIdCIICUItS are inter.

rupted at normal contact 31, 32 of DR so as to prevent ringing back overthe'calling line.

Dueto the current charge of the called line which is caused by the periodic application ofringing current, relay; CS receives the discharge from the line each time normal. contact 27 of IR is closed. This will cause relay CS to momentarily open the circuit .of DR,but DR being a slow acting relay, it requires a proloiiged interruption of its holding circuit to eflect the restoration thereof.

Upon a response being secured from the called substation, and upon the following deenergization of IR, a circuit for relay CS is established from ground through the winding of CS, normal contact 27, alternate I contact 24 over the called line returning '7, 8, close as through the winding of SW to battery. Relay CS therefore energizes, interrupting itsnormal contact 23 whereby supervisory signal 22 is efiaced and the holdin circuit for relay therefore restores establishing the continuity of the talking conductors and alsointerrupting the operating circuit forrelay IR,

After the subscribers have finished con versation they will replace their receivers upon their respective switch-hooks whereby the circuits for relays AS and CS are in terrupted causing the restoration of these relays and lighting supervisory signals 13,

plugs from the connected spring jacks 10, 20, and thereby brings about the restoration of the apparatus employed.

Assuming now 'that manual ringing 1s being employed and that the switch S is in its open position, when the operator fidepresses a ringing plunger alternate contacts before whereby relays DR and I IR" energize, relay DR remaining looked as e already pointed out.

plunger is restored, relay IR restores and ringing key,

;But when the ringing type of ringing to the other, it is only necesto actuate the switch 93.Referring now to the embodiment invention as illustrated in Fig.2, the difference in this systeig, over that shown in Fig. 1 is that three con uctors are employed at the jacks and plugs,wh1le in Fig. 1 but two conductors are employed,

sary

Fig of my principal kick up its armature and DR is interrupted. Re ay DR QAS is established over the calling line.

The operator therefore withdrawsthebe is brought about frorn the foregoing.

Therefore the cut-off relays of the threeconductor line circuits are connected to a third contact of the jack and a battery conthe third contact ofnection is provided for the answering plug 1 while at. the calling '7 plug '2 the third contact .is connected to the winding of switching relay SW so that relays SW and 00* are connected in series to bring about their energization.v Also I- have provided a two-winding answering s supervisory relay AS connected in bridge of the talking conductors of the cord, and a two winding calling supervisory relay CS in bridge of the talking conductors at the calling end of the cord. r

The corresponding parts of the systems of Figs. 1 and 2 are indicated byjlike reference 3 characters, except in Fig. 2 the sufiix prime. I

is, added.

Now as to,the operation of the system of Fig.2, whenjan answering plug 1 is inserted into a jack.10 .o f a calling line, the cutoif relay CO is energized over a circuit 111- eluding the third; contacts of jack 10 and lug 1 and a circuit for supervisory relay 9e Relay AS therefore connects the operators telephone 0 in circuit-with the cord in a] manneras before described while when the calling plug 2 is inserted into a jack 20 .95

of a called line, relays SWV of CO are'energized over a series clrcult to brin about the disconnection of the operators te ephone" O and-the lighting of supervisory signal 22 The actuation of themringingapparatusof cord circuit E is identical with the operation of theringing apparatus of cordcircuit E.

Upon a response being secured from called-substation B the calling supervisory -1Qiirelay CS is energized by current over the called line whereby its normal contact 23 is interrupted to bring about the supervisory and ringing control as described in connection with the cord circuit E.

When the subscribers at substations A and B have finished. conversation, they will replace their receivers upon theirrespective 1 switch-hooks whereby the circuits for supervisory relays AS and OS are interrupted 1.15

to effect the operation of the supervisory signals 13 22 -Upon the operator withdrawing plugs 1 and 2 from the connected spring jacks, the apparatus used in establishir the connection is restored to, nor- 1.2K;

mal in a manner as previously described;

In the several embodiments ofmy invention illustrated, well-known forms of line and substation circuits are shown together with well-known forms of supervisory api it is to be understood that I- paratus and I applying my 1nvent1on in other contemplate ways than that shown and I aim tocover all such modifications as come within'thes pirit and scope of the appended cla ms.

Having described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. A telephone system comprising a called telephone line, an operators link circuit connected thereto, a ringing key, ringing control relays, a source of rlnging current, circuit connections for said key and relays whereby when said key is operated an automatic and intermittent application of ringing current to the called line is efi'ected, and a single pole manually controlled switch for changing said circuit connections whereby the automatic and intermittent control is remored and an application of ringing current to the said called line from said source of current is positively effected by each operation of said ringing key.

A telephone system comprising telephone lines, opcratofis link circuits for connection thereto, a ringing key for each of said circuits, ringing control relays for each of said circuits. a source of ringing current, circuit connections for each of said keys and associated relays whereby when a key is operated an automatic intermittent application of ringing current to a connected called line is established, and a single pole manually cimtrollcd switch common to said link circuits for changing said circuit connections whereby the automatic intermittent control is removed and an application of ringing current to a connected called line is positively effected by eaclr operation of a key. i

it. A telephone system comprising telephone lines, an operatofs link circuit focconnection thereto, a rin in key rin in control P: n .J t: in

relays, a source of ringing current, circuit connections for said key and relays whereby when and key is operated an automatic in termittcnt application of ringing current to a connected called line is established, and a single pole manually (:ontrolled switch for varying said circuit connections to remove said automatic intermittent control and whereby an application of ringing current is positively effected by each operation of said key.

t. A. telephone ,systeui comprising telephone lines, operators link circuits for connection thereto, a ringing key and ringing y control relays for each of said link circuits, a source ol rmgnlg current, cn-ciut connections for each key and associated relays whereby when one of said keys is operated an automatic intermittent application of ringing current to a connected called line is established, a single polemanually controlled switch common to said link circuits for varying said circuit connections to remore said automatic intermittentcontrol and wherebynirapplication ot ringing current is positively elt'ected by each operation of one of said keys.

5. A telephone system comprising a called telephone line, an. operators link circuit connected thereto, a ringing key, interrupter and disconnect relays, an interrupter adapted to be placed in circuit relation with the interrupter relay by an energization of said disconnect relay, circuit connections whereby an operation of said ringing key will energize said relays to periodically apply ringing current to the called line, and a manually operable switch for disconnecting said interrupter to place saidv relays under manual control of said ringing key.

6. A telephone system comprising :1. called telephone line, an operators link circuit connected thereto,a ringing key, interrupter and disconnect relays, an interrupter adapted to be placed in circuit relation with the interrupter relay, a manually operable switching device adapted for disconnecting said interrupter, circuit connections where by an operation of said ringing key will energize said relays and place said interrupter in circuit relation with said interrupter'relay to apply ringin current to the called line, and means w ereby when said interrupter is disconnected from the interrupter relay by said manual switch said relays are manually operative by said ringing key.

7. A telephone system comprising it called telephone line, an operators link circuit connected thereto, a ringing key, ringing control relays, an interrupter adapted to be placed in circuit relation with one of said relays to ell'ect intermittentoperations thereof, a source of ringing current connected in circuit with the called line upon each such operation of'said relay, circuit connections whereby an operation of said ringing key will; cause operation of said relays to effect such periodic application of ringing current, and a single pole manually icontrollcd switch for opening the circuit of said interrupter whereby said circuit connections are effective to place said relays under man said interrupter circuit is rendered inctl'ective and whereby ringing current is applied only while said key is held operated.

1). A telephone system comprising a subscribers line, a link circuit for connection to said line a ringing control relay for said link circuit, means for intermittently operating said relay, starting means for start ing such intermittent operation, said starting means adapted to cause a preliminary operation of. said control relay. IOY' telephone system compri scribers line, a substation thereon, a link circuit adapted to be connected to said line, automatic ringing means for said link circuit, a switching device for starting the'op: eration of said ringing means whereby said substation is intermittently signaled, and means controlled by said switching device for transmitting a preliminary signal to said substation. Y 1' 11. A telephone system comprising a subscribers line, a substation thereon, a manual link circuit provided with automatic ringing means adapted to be connected to said line, a ringing key plunger for causing the operation of said automatic ringing means whereby said substation is intermittently signaled, and means controlled by said ring ing plunger for insuring that said substation will be signaled the instant that said.

ringin plunger is operated.

12. n a telephone system, the combination of a subscribers substation and a link circuit connected thereto, automatic ringing means for said link circuit, a switching device for starting the intermittent operation of said ringing means whereby said sing a subsubstation is intermittently signaled, and means for insuring that the said substation will be signaled the moment that said switching means is operated.

13s A telephone system comprising a subscribers lineprovided with a substation thereon, alink circuit for connection to said subscribers line, a ringing relay for said link circuit, an interrupter device for intermittently operating said relay whereby said substation may be intermittently signaled, and independent means for energizing said relay to cause a'preliminary signaling oper ation atsaid substation.

14;. 'A telephone system including a subscribers telephone line, a link circuit for connection to said line, means for applying ringing current to said line, an inter-. rupter device for intermittentlyoperating said means, and an electrical switch for first operating said means and for, ttliereafter connectmg said interrupter devlce 1n circuit with said means.

Signed by me at Chicago, county of Cook and Stateof Illinois, in the presence of two

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