US937050A - Telephone system. - Google Patents

Description

` H. P. vCLAUSEIL TELEPHONE SYSTEM.

APPLICATION FILED JUNE 4, 1908.

937,050. A Patented ot.19,19o9.

f .ATTORNEY of which the following is -6 has an armature 15,

UNITED sTATEs PATENT oEEioE.

HENRY. P. CLAUSEN, OF CHICAGO,

ILLINOIS,` ASSIGNOR T0 AMERICAN ELECTRIC TELE- PHONE COMPANY, OF CHICAGO, ILLINOIS` A CORPORATION 0F NEW JERSEY.

TELEPHONE SYSTEM.

` Specification of Letters Patent.

`Patented Oct. 19, 1909.

Application filed June I151968. Serial No. 436,546.

To all whom t may concern:

Be it known that I, HENRY P. CLAUSEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephone Systems,

a full, clear, concise, and exact descriptiomreference being had to t-he accompanying drawings, forming a part of this specification.

. My inventionv relates to ytelephone systems,`

and has for lit/s object the provision of a new and novel *centralr energy switchboard circuit, features of the invention being more particularly in the nature of: test circuitsfor such central energy systems, in connection with instrumentalities necessary for the adaptation of such test circuits to theg-eneral' central energy switchboard circuits.

I will describe my invention more in deL tail by reference to the accompanying drawing, illustrating diagrammatically the' circuit arrangements.

A subscribers station,y comprising a lreceiver, l, transmitter, 2, in connection With the signaling ringer, 3, are shown as connected by means of lineA Wires, 4 and 5, to a central -st-ation. rlhe subscribers circuits are'shown in duplicate more clearly to reveal the interconnections. Each subscriberls substation circuit is united to the same line instrumentalities at the central station. Thisis true for the normal subscribers lines. This Vcentral station vequipment associated Witheach normal subscribers line, consists of a line relay 6, one of its terminals being connected to a battery 7 which battery has its positive terminal grounded.v An 'additional instrumentality for each subscribers line circuit is the cut-olf relay 8, which is provided with an armature 9, and having a back-contact, 10. The armature 9 is like- Wise provided with a front contact 11. -A further armature 12 is under the influence or control of relay 8, having a back-contact 13', and a front contact, 14. The line relay tact .16. A lamp 17 is controlled by the armature 15., and front contact 16.. An an- ,swering jack, having a tip-spring 18,-and a- 'sleeve spring 19, and a thimble 20, is shown in connection with each' subscribers line circuit, and the same answering'jack springs and thimble are multiplied through to various multiple jacks, as shown. When the disconnects the 'lin-e relay which has a front .Con'

subscriber removes his receiver from the switch-hook, a closed circuit 1s ellected at the sub-station of the line Wires Ll and A current now passes from the negative ter.

minal of the battery 7 to the line relay 6, back-contact 10, armature 9 line conductors 4 and 5, through the substation set, through the armature 12, through back-contact 13, to ground, which is connected to said positive batteryterminal 7, thus pulling up relay 6, which energizes the lamp 17, and gives the line signal. The answering plug, co1npris ing a tlp contact 21, and a sleeve contact 22, is then inserted int-o the jack, and this immediately causes .anenergizing of the cut-ott relay 8, byl reason of the fact that current. from the negative terminal of the battery 7 flows through the supervisory relay 23.v

through the sleeve contact ofthe answering plug, through the thiinble 20, thence through the cut-of relay 8, back to the positive terminal of the battery, as here shown, through the ground connection. This immediately 6, and causes the lamp 17 to be extinguished.

It will thus be seen that negative battery7 is connected to thimble 20 of a talking sub scribers line. The reason for this will be *A more -apparent hereafter when it is explained that 1n order to get a-busy'test, it is necessary for the calling plug to come in contact with negative battery at the thimble. A

calling plug having a tip contact 24, and a sleeve contact 25, is associated in the same cord circuit With the answering plug having contacts 21 and 22 respectively. A ringing key connected to,..a generator 26, as Well understood, is shown. The cord circuit between the answering and calling plug is broken by condensers 27, 27, so far as direct currents are concerned, hoWever,'these condensers offer practically no opposition to the talking current. p

A listening key, having springs 28, 2S), connected to the'answering plug, is shown, and this key, by means of springs 30, 30 effects' connection with the -operators talking set, comprising the head receiver, .31', transmitter, 32, primary of the induction coil, 33, secondary' of-induction coil, 34, and condenser, 35. Theprimary 33 of the induction coil,y and the transmitter' 32', must be connected to some suitablelsource of current, not here shown. The ringing spring 29 is furthervsecured yan insulating bushing to a spring'36, having a back contact 37, toA be used for busy test purposes, as will be more clearly set, forth hereinafter.

' Battery current from the negative pole of the battery 7 is furnished to theA line con# ductorl 4', through the sleeve spring 19, the

sleeve of theplug 22, and the supervisoryl relay 23. Positive battery current is furnished from the positive pole of the battery, through the supervisory relay 38,.-to the tip .current conductor, from there through the positive battery current to line conductors when the calling plug is inserted in the jack.

I have previously stated that when any subscriber is busy, the thimbles 20 are con nected to negative battery. It will thus be4 seen that should the calling plug ti 24 come in contact, for instance, witht imble 20, which is connecteduwith negative battery, a circuit Will be established from said thimble 20, through tip 24, through the ringing key springs, through the relay 42, the armature 43, through the wire 44, the back contact spring 37, the spring 36, tertiary coil 45 and impedance coil 46 to ground. or storage battery. A flow of current will therefore take place between the positive and negative terminals Vof the battery 7, through my new and novel coil 45.

The coil 45' is in inductive relation with the coils 34 and 33, so that the Vflow of cul'- rent in said coil 45 will cause a click 'in the operators receiver 31, apprising the operator that the called-for line is busy. The great advantages of arranging the busy test circuit in this way are due to the dampening eiiect of the click as secured by the interposition of the impedance coil 46, and the Winding of the relay 42, which winding thus serves a double purpose. Itis, of course, understood that in making the busy test, the listening key, comprising the springs 28 and 29, is to bel actuated outwardly to effect the connections necessary.

Having thus described my improved circuit, what I claim as new, and desire to secure by Letters Patent is:

1. A telephone system, comprising line circuits and a cord circuit, a supervisory relay in said cord circuit, an operators talking circuit in said lcord circuit, and means for establishing a busy test circuit through said operators talking circuit, and said supervisory relay.

2. A telephone system, comprising line circuits and a cord circuit, a supervisory relay insaid cord circuit, an operators talking circuit, having an induction coil provided With a tertiary winding, and means for establishing a busy test circuit through said relay and said tertiary winding. In witness whereof, I hereunto subscribe `my name this second day of June A. D., 1908.

HENRY P. CLAUSEN.-

Witnesses:

E. B. CAMPBELL, O. M. NENNIcL.

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