US641570A - Telephone. - Google Patents

Description

No. 64|,570. v Patented lan. I6, |900.

- D. H. WILSON.

TELEPHUNE.

(Application fixed Jan. 2o, 1399.)

(No Model.)

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Elzas C0. woaumo., wummoroN D c (Application led Jan. 20, 1899-) I 2 Sheets-Sheet 2.

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NTTED STATES DAVID H. wILsoN,

PATENT FFICE..

TELEPHONE.

SPECIFICATION forming partof Letters Patent No. 641,570, dated January 16, 1900.

Application filed January 20,1899. Serial No. 702.777.y (No model.) g

T0 @ZZ whom t may concern:

Beit known that I, DAVID H. WILSON, a

citizen of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephones, of which the following is a speciiication.

My invention relates to telephones, and has for its object to provide a new and improved telephone, of which the following is a description, reference being had to the accolnpanying drawings, whereinv Figure l is a diagrammatic view showing a device embodying my invention. Fig. 2 is a diagrammatic view showing a modified construction. Fig. 3 is a section on line 3 3, Fig. 2. Fig. 4 is a plan view of the core and primary and secondary coils shown in Fig. 3.

Like letters refer to like parts throughout the several figures.

Referring now to Fig. l, I have shown diagrammatically a construction embodying my invention, the drawing showing only two i'nstruments A and B for purposes of illustration. In this construction each instrument is provided with a suitable transformer of any description, comprising a primary coil O and a secondary coil D'. One terminal of the primary coil is connected with the transmitter C', the transmitter being connected by conductor O2 with a source of electric supply Cs at station A. The other terminal of the primary coil is connected by conductor O4 with a suitable circuit-varying device, by means of which it is connected with the main line E. As herein illustrated, I have shown the circuit-varying device as consisting of an ordinary hook O5, upon which the receiver is suspended. The conductor O4 is connected with the contact O5, opposed to the contact O7., associated with the hook O5. The secondary coil D is connected by conductor Dl with a suitable circuit-varying device, which in this case consists of the contact D2, opposed to the contact DS on the receiver-hook O5. The contact D5 is connected by conductor D4 with the" receiver D5, said receiver being connected by conductor D6 with the other terminal of the secondary coil. When an ordinary transformer is used, a suitable signaling device must be provided. Any suitableconstruction for this purpose may be used. As

line E. When it is desired to signal instrun ment B, for example, the source of electric supply is rendered operative, and a current is passed through the system, which is traced as follows: from the source of electric supply through conductor F5, contacts F4 and F5 and conductor F tothe main line E, and thence through the signaling device of the instrument B, so as to actuate it. The current then passes to the ground, so as to complete the circuit. After the signal has been sent the re'- ceiver is removed from the hook O5. The hook O5 then moves so as to separate the contacts F4 and F5 and complete the circuit between the contacts C5 and C7 D2 and D5. The talking-circuit will then be completed and will be as follows: from the source of electric supply C2 through conductor O2 to transmit ter C', thence through the primary coil C, thence through conductor C4 and contacts C6 and C7 to the main line E, thence through the primary coil of the instrument B, thence to the ground and back to the source of electric supply O3. The current in the primary coil sets up an induced current in the secondary coil D of the instrument B, which passes through the receiver, the circuit being traced as follows: from the secondary c oil D through conductor D5, receiver D5, conductor D4, contacts D3' and D2, and conductor D back to the secondary coil D. It will be seen that the primary circuit in this case constitutes the main line ofthe system and that the source of electric supply and the transmitter are directly in this mainline. seen that the receiver is not in the main line,

but is in a local secondary circuit at the re-v ceiving instrument.

Referring now to Fig. 2, I have, shown diagrammaticallya construction similar to that shown in Fig. 1, wherein the induction-coil It will also beis of a peculiar construction. Said inductioncoil consists of a core G, upon which are wound the primary and secondary coils C and D, said core being mounted between the opposed pole-pieces of a permanent magnet. By rotatably mounting the core G and the primary and secondary coils and providing suitable commutatore G G2 and a crank or handle G3 for the shaft I may do away with the extra signaling devices and use the transformer for this purpose. I find that when this particular transformer is used with the arrangement herein shown better results are produced than when the ordinary transformer is used. YVhen the parts are arranged as shown in Fig. 2 and it is desired to call up instrument B, the core G is rotated by means vof the handle G3 and a series of impulses sent out upon the line. The circuit will be traced as follows: from the secondary coil D by conductor DG to contact F4, thence through the receiver-hook C5 to the main line E, thence through the secondary coil of instrument B andthe signaling device F to the ground, and thence through the signaling device of instrument A back to the secondary coil. If the receivers are now taken from the hooks, the talking-circuit is completed and will be as follows: from the source of electric supply C3 through the transmitter C', contacts C and C7, and primary coil C to the main line E, thence through the primary coil of the instrument B, and thence through C7 CG and the transmitter to the ground, the circuit being provided with a ground return. A current is then generated in the local secondary circuit containing the receiver of instrument B, said circuit being traced as follows: from the secondary coil of the transformer through conductor D6 to the receiver, thence by conductor D4, contacts D3 and D2, and conductor D' back to the secondary coil.

IVhen the construction herein shown is used, I find that highly satisfactor f results may be obtained with very little current. I have found that by the arrangement herein shown I am able to produce results which I have been unable to produce with any of the telephones now on the market. Since the primary circuit is the main line, it is only necessary to have a source of electric supply or battery at one end of the line, and hence I am able to do away with a large number of sources of electric supply now used in the commercial operation of telephones.

I have described a simple construction embodying my invention for the purpose of making it clear; but it is of course evident that my invention is applicable to various constructions and arrangements, and I therefore do not limit myself in any manner by the drawings shown.

The induction-coil, wherein the primary and secondary coils are wound upon a core of magnetic material mounted between the opposed pole-pieces of a permanent magnet, may be of any desired construction, and I have shown a simple form for purposes of illustration. In this form the core G and the primaryand secondary coils are mounted between the pole-pieces I-I of a permanent magnet. Attached to the ends of the core G are the caps or plates G4, provided with the projecting parts G5, upon which the core is mounted when the coils are adapted to be rotated to operate the signaling device. It is of course evident that this rot-ation is not necessary and is not used when the talkingcircuit is completed. These projections G5, which constitute the shaft, are mounted in suitable bearings, which in this instance are obtained by means of the caps G, attached to the magnet.

I claim-- l. A telephone system, lcomprising at least two instruments located at diiferent points, each comprising a receiver andatransmitter, means for connecting the two instruments together by an electric circuit, an inductioncoil associated with each instrument, said induction-coil comprising a permanent magnet having opposed pole-pieces, with two separate coils wound upon a core of magnetic material mounted between said opposed polepieces, so as to form part of the magnetic circuit of the permanent magnet, one of said coils being the primary coil and theother the secondary coil, the primary coil of cach in ductioncoil being connected in the main circuit between the two instruments when the talking-circuit is completed.

2. A telephone system, comprising at least `two instruments located at dierent points, l each comprisinga receiver anda transmitter,

means for connecting the two instrumentstogether by an electric circuit, an induction coil associated with each instrument, said inpieces, so as to form part of the magnetic circuit of the permanent magnet, one of said coilsbeing the primary coil and the other the secondary coil, the primary coil of each induction-coil being connected in the main circuit between the two instruments when the talking-circuit is completed, the secondary coil of each induction-coil connected in a local secondary circuit with its associated receiver.

3. A telephone system, comprising at least two instruments located at different points, each comprising a receiver, a transmitter, an induction-coil and a signaling device, a main line connecting said instruments normally arranged so that the signaling devices and the secondary coils of said induction-coils are in circuit, a switching device associated with each instrument and adapted to vary the circuits so as to connect the secondary coil of each instrument in a local circuit with its associated receiver and to connect the two primary coils and transmitters in the main line so as to form the talking-circuit.

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4. A telephone system, comprising atleast two instruments located at different points, each instrument comprising av receiver, a transmitter, a signaling device and `an induction-coil, a main-line circuit between the two instruments normally connected in circuit through the signaling devices, a source of electric supply in the transmitter-circuit, a local secondary circuit connected with the secondary coil of each instru ment normally open, a switching device associated with each instrument and adapted when operated to vdisconnect the signaling device from the main circuit and connect the transmitters and the primary coil of the transformers in said main circuit and close the local secondary circuit.

5. A telephone system, comprising at least two instruments located at different points, each instrument comprising a receiver, a transmitter, a signaling device and an induction-coil, a main-line circuit between the two instruments normally connected in circuit through the signaling devices, a source of electric supply in the transmitter-circuit, a local secondary circuit connected with the secondary coil of each instrument normally open, a movable arm upon which each receiver is supported, aseries of contacts associated with each arm, said arms adapted to move when the receivers are taken therefrom, so as to disconnect the signaling devices from the main circuit, close the local'secondary circuit and connect the transmittersand the primary coils of the induction-coils in said main circuit, substantially as described.

DAVID H. WILSON.

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