US1007575A - Telephone system. - Google Patents

Description

H. F. JOEGKEL.

TELEPHONE SYSTEM.

APPLIOATION FILED 413.18, 1911.

:DLUMBIA PLANDURAPH CO.. WASHlNu'roN. n. c.

Patented Oct 31; 1911.

HENRY F. JOEGKEL, 0F CAMP POINT, ILLINOIS.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Application filed March 16, 1911.

Patented Oct. 31, 1911 Serial No. 614,964.

To all whom it may concern:

Be it known that I, HENRY F. J OECKEL, a citizen of the United States, residing at Camp Point, in the county of Adams and State of Illinois, having invented new and useful Improvements in Telephone Systems, of which the following is a specification, and which are illustrated in the accompanying drawing, forming a part thereof.

The invention relates to Patents No. 955,335 and No. 982,209. The same telephone instruments are used but also wired to be used upon this telephone system in which annunciators are connected to the ground from each side of the metallic line circuit.

The object is to provide a telephone system with a more balanced metallic talking line circuit than that of Patent No. 955,335 and not so expensive as that of Patent No. 982,209. These objects are obtained in the mechanism and system of wiring, as hereinafter described and shown in the accompanying drawing.

The drawing represents central stations at 20 and 21 and at 22 and 23 substations of a party line, the line wires are shown at L and L While but two telephones are shown, it is to be understood that there "may be more, and that there may be more. than two central stations, or less, also that all stations of a line may be central stations, and the line used as a trunk or toll line.

The central station line jack 13 of station 20 is connected at the tip spring a to L and at the sleeve spring 7) to L, the annunciator 14 is connected to ground fromL at line jack spring a. The line jack 13 of central station 21 is connected at the tip spring a to L and wit-h the sleeve spring I) to L the annunciator 14 is connected to ground from L at line jack spring 6.

The telephone instruments of substation 22 consisting of a magneto 1, an annunciator 2, switch E, transmitter 3, receiver 4, induction coil 5 and switch hook 7 are the same shown in Patent No. 955,335, a switcharm F and contacts 70 and Z have been added in the circuit of the magneto, a condenser D in the secondary talking circuit and a clip 6' in the twire h of the bell or annunciator circuit. In

cuit of these instruments have otherwise not been changed, and therefore may, by connecting clip 6 to wire it at j be used as described in Patent No. 955,335. The telephone of this station is connected to L by binding post A, to L by binding post G, and to the ground by binding post B. The secondary talking circuit is from L to L by binding post A, wire f, switch hook 7, wire 7, induction coil 5, wire 7, condenser D, receiver wire 7", and binding post C, the circuit is however normally interrupted at the switch hook. The annunciator circuit is from L to ground by binding post A, wire 7, clip 6, wire f, and binding postB. The magneto circuit is from L to ground by binding post A,-wire f cont-act 7c, switcharm F, magneto 1, wire it, switch E, wire f, and binding post B; from L to ground by binding post O, wire f contact Z, switcharm F, magneto 1, wire it, normal position of switch E, wire 1, and binding post B; and from L to L by binding post A, wire f, contactk, switcharm F, magneto 1, wire 72,, switch E, wire 7, and binding post C. The magneto is however normally cut out at the usual cut out. The wire 72. of the annunciator 2 may be permanently connected to wire f instead of to switch E and the normal position of the switch E and F may then be changed without departing from the system.

The telephone instruments of substation 23 consisting of a magneto 1, annunciator 2, switch 12, transmitter 3, receiver 4, induction coil 5, and switch hook 7 are the same shown in Patent No. 982,209, a switcharm F and contacts is and Z have been added in the circuit of the magneto and a condenser D in the secondary talking circuit, the switch 48 recommended in the system of Patent No. 982,209 is not used in this system, the circuits of these instruments have otherwise not been changed and the telephone may still be used in said patented system. The telephone is connected to L by binding post 8, to L by binding posts 9 and 11, and to the ground by binding post 10. The secondary talking circuit is from L to L by binding post 9, wire f, switch hook 7, wire f induction coil 5, wire f condenser D, receiver 4, wire f, and binding post 8. The annunciator circuit is from L to ground by binding post 11, wire f switcharm 8, wire it, annunciator 2, wire it, switcharm s, wire f, and binding post 10. The magneto circuit from L to ground is by binding post 11,

wire f switcharm 8, wire f contact 70, switcharm F, magneto 1, wire it, switcharm 8, wire f, and binding post 10; from L to ground by binding post 8, wire contact Z, switcharni F, magneto 1, wire it, switcharm 8, wire f, and binding post 10; and from L to L by binding post 8, wire 7, switcharm 3, wire 7L, magneto 1, switcharm F, contact 7.2, wire f switcharm a, wire 9, and binding post 9.

The telephone instruments of stations 22 and 23 and their wiring, except the dividing of the talking and signaling circuits are those of telephones of the usual bridging telephone system, in which the bells have a resistance of from 1,000 to 2,500 ohms. Various ways are used by different manufacturers to normally cut the magneto of their telephones out of circuit, some alternately cut their bell or magneto out of circuit, any of those telephones may have their circuits divided in accordance with this system without changing in that respect.

The balancing of the metallic talking line circuit is in giving each side an equal amount of ground, for that purpose one bell and one drop are shown connected to ground from L, and the other bell. and drop connected to ground from L this divides the ringing load of the line and gives each side of the metallic circuit nearly an equal amount of ground. Each telephone is provided with switching means to place the magneto in circuit to signal any station upon the line by a signaling code and also to signal over a complete metallic circuit to operate a switch board clearing out drop. The condenser D avoids ringing over both sides of the metallic circuit when receivers are down. The connecting of annunciators to ground from both sides of a metallic talking circuit as shown forms a shunt for the talking current, therefore high resistance annunciator coils are preferable in this system.

The different parts used in the combination of this telephone system are well known and need no detailed description.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in a telephone system, a central station, a metallic circuit leading therefrom and being normally open at said station, a plurality of substation talking sets bridged into the circuit said bridges being normally interrupted at the switch hook, each substation having an annunciator normally connected to ground from one or the other side of the metallic circuit, a magneto in a normally open branch at each substation, and switching means adapted to connect the magneto to ground from either side of the metallic circuit or to bridge into the metallic circuit, and an annunciator connected to ground at the central station from one or the other side of the metallic circuit, said annunciators being however connected to ground so as to give each side of the metallic circuit nearly an equal amount of ground.

2. The combination, in a telephone system, a central station, a metallic circuit leading therefrom, a plurality of substation talking sets bridged into the circuit said bridges being normally interrupted at the switch hook, each substation having an annunciator normally connected to the ground from one or the other side of the metallic circuit, a magneto and switching means at each substation to connect the magneto to ground from either side of the metallic circuit or to bridge into the metallic circuit or to leave out of either circuit, an annunciator at the central station connected to ground from one or the other side of the metallic circuit, said annunciators being however connected to ground so as to give each side of the metallic circuit nearly an equal amount of ground.

3. The combination, in a telephone system, a central station, a plurality of substations, a metallic talking circuit connecting all of said stations, an annunciator normally contained in a ground branch at the central station, and a ground branch at each substation, containing a non-polarized annunciator, said ground branches of said substations being divided equally upon both sides of the metallic talking circuit, a magneto at each substation, and switching means at each substation to connect the magneto in circuit with the annunciators upon either side of the metallic circuit, to bridge the magneto into the metallic circuit, or to leave the magneto normally out of circuit.

l. The combination, in a telephone system, a central station, a metallic circuit leading therefrom, a plurality of substation talking sets bridged into the circuit, said bridges being however normally interrupted at the switch hook, a normal ground branch containing an annunciator at each station, said ground branches being divided upon both sides of the metallic circuit so as to balance the metallic circuit, a magneto and means at each substation to connect the magneto to ground from either side of the metallic circuit and to signal any station upon their respective sides by a signaling code, or to bridge the magneto into the metallic circuit, or to normally cut the magneto out of circuit.

5. The combination, in a telephone system, a plurality of central stations, a metallic cii cuit connecting said stations, normally open at each station, a plurality of substation talking sets bridged into the circuit, said bridges being however normally interrupted at the switch hook, a normally closed ground branch containing a non-polarized annunciator at each station, said ground branches being divided upon the two sides of the metallic circuit to give each side nearly an equal amount of ground, a magneto and switching means at each substation adapted to place the magneto in circuit with the ground branches of either side of the metallic circuit to signal any station upon their respective sides by a signaling code, the magneto being however normally not in circuit.

6. The combination, in a telephone, system, a plurality of central stations, a metallic circuit connecting said stations, normally open at each station, a ground branch containing an annunciator at each station, said ground branches being divided upon the two sides of the metallic circuit to give each side nearly an equal amount of ground, said annunciators of either side being adapted to be operated upon their respective sides collectively by a signaling code.

7. The combination, in a magneto, local battery, telephone set, a secondary talking circuit terminating at two binding posts A and C, an annunciator circuit terminating at binding posts A and B, a magneto and means to terminate the magneto circuit at binding posts A and B, C and B, or at A and O, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY F. J OECKEL.

Witnesses:

N. R. BECKETT, HARVEY BLODT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G.

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