US977142A - Telephone system. - Google Patents

Description

F. x. STAUB. TELEPHONE SYSTEM.

APPLIOATIOH FILED APBJS, 1910.

Patented Nov. 29, 1910.

uvvsmon 2?;47275 ,K. 527a;

WITNESSES: 2%wm 3 ATTORNEY UNITED PATENT @ldlFlQE FRANK X. STAUB, OF FORT WAYNE, INDIANA, ASSIGNOR YES C-IJEJVIN LELEPHGNE MANUFACTURING COMPANY, OE CEJCILGO, ILLINQIS, A CORPORATION 05 ILLINOIS.

TELEPI-EGNE SYSTEM.

amiss.

Application filed April 8, 1910.

Specification of Letters Patent.

Serial No.

had to the accompanying drawings, forming a part of this specification.

My inven ion relates to telephone systems and has for its object the provision of an improved circuit arrangement and apparatus whereby telephone receivers equipped with soft iron readily magnetizable and demagnetizable cores may be energized by means of direct current passed over the lines leading to the telephone stations including receivers. in accordance with the preferred embodiment of my invention, when a line is idle, the soft iron-core receiver is not included in circuit with the source of direct current but when this line employed for conversational purposes, the source of direct current is included in circuitwith the receiver. The telephone transmitter at each station equipped with a soft iron core receiver is desirably directly included in the telephone line, but I do not wish to beliniited to this characteristic. Multiply related paths, each'serially included in the line, are provided at the telephone station equipped with the soft iron core receiver, one of these paths desirably containing all of the receiver voice current winding while the other path is substantially non-inductive. The two multiply related paths are so proportioned as to enable the source of direct: current, such as a battery, properly to magnetize the core of the receiver so as to make it perform the function of a permanent magnet and at the same time be properly responsive to voice currents coming in over the line, the substantially non-inductive shunt permitting voice currents impressed. upon the line by the operation of the transmitter at the same station with the receiver to be shunted away from the receiver winding to a sutlicient extent to enable them properly to be impressed upon the line, The substantially n0n-inductive shunt provided about the receiver winding may be metallically continuous, in which case a noninductive coil of a resistance which is desirably high with respect to the receiver winding is provided.

' pref-erred, the non-inductive shunt may udc a condenser in place of the non-inductive coil.

will explain my invention more fully by reference to the accompanying drawing showing the preferred embodiment thereof, in which- Figure 1 illustrates a telephone line extending from a substation to an exchange and Fig. :2 illustra in y be found, for example, in interior sys tems.

Like parts are indicated by similar charactors of reference throughout the different iigures.

Referring first to the equipment illustrated in Fig. 1, have shown telephone inc whose limbs a L) extend from a telephone .tation A to an exchange B, the limbs 61 b terminating respectively in short and long line jack s irings 0 (Z that are illustrated respectively in engagement with the tip and sleeve of a cord circuit plug 0. The cord circuit strands include condensers f and g shunted respectively by the pair of impedance coils 7"" and the pair of impedance coils 5 a battery 71 of from twenty to sixty volts or other suitable voltage having one pole connected between the impedance coils f and the other pole connected between the impedance coils g. l have not illustrated any more of the cord circuit apparatus nor any more of the line equipment, as such apparatus is well known by those skilled in the art. When a jack receives a plug thus connected with a source it of direct current, the current may flow over the line, assuming that the telephone of such line is removed from its switch hook, a switch hook 2' being illustrated at the substation A. When the switch hook is relieved of the weight of the receiver, it oins the two sides a Z) of the telephone line through a transmitter is and the winding Z of a telephone receiver serially related with the transmitter, this winding surrounding a soft iron readily magnetizable and demagnetizablo core which is magnetized by the current of the battery it to enable it to have the function of a permanent magnet and which is at the same time subject to incoming voice currents traversing the winding Z to enable the receiver telephonically to respond. A substantially non-inductive shunt circuit msurrounds the receiver winding but is serially related with tes a telephone line such as min the transmitter so as to reduce the iinpedance oti ered by the winding}; Z to the voice currents impressed upon the line at the transmitter 70, said shunt circuit being so proportioned to cause the voice currents coining in to the receiver over the telephone line properly to pass through the receiver winding Z to occasion the eiiicient operation ot he receiver.

i the form of the invention illustrated in l, the substantially non-inductive shunt circuit inetallically continuous and include a non-incuctive winding; a that may be, for example. of five l'iundrecl ohins re sistance in event of the receiver winding;- Z being of one hundred ohms resistance. By the relative proportions of "esistance specitied the receiver may readily be magnetized by direct current from the battery it and will, readily respond to incoming voice currents while the impedance ottered to outgoing voice currents is sutliciently reduced to enable the proper propagation of outgoing voice currents.

The arrangement shown in Fig. 2 is in all essential respects similar to the arrangement shown in Fig, 1. the battery being connected directly with the line thr ugh the inipedanco coils f 9 without the aid of plug and jack, wh le a; the telephone station eouippeo with a sort iron core telephone receiver, the substantially non-inductive shunt about the receiver winding Z includes a con denser 0 that may be of one halt inicrojtarad capacity in place of the substantially noninductive winding a belonging to the sys tem illustrated. in 1.

/Vhile it have herein. shown and particularly described the preferred embodiment of my invention, it do not wish to be limited era-r42 to the exact details of construction shown as changes may readily be made without departing; from the spirit of he invention, but

Having thus described my invention, I claim as iron: and desire to secure by Letters Patentthc fOllOWiTlgZ-- 1. A telephone system including a tele phone line having); a telephone station which includes a receiver having a soft iron readily mo 1 cable and denuignctizable core provided will a winding; serially included with the line and with means at the same station with the receiver for impressing voice currents upon the line; a substantially non-indu'tive shunt aoout turns oi:- the receiver winding and also serially related with said means; and a source of direct current included in circuit with the receiver winding by the telephone line.

2. A telephone system. inclu iling a telephone line having a telephone station which includes a receiver h aving a soft iron. readily inagnetir zable and deniagnetizable core provided with a winding serially included with the line and with a transmitter at the 53211116 station with the receiver for impressing voice currents upon the line; a substantially non-inductive shunt about turns of the re cciver winding and also serially related with said transmitter; and a source of direct current included in circuit with the receiver winding and the transmitter at the same station therewith by the telephone line.

In witness whereof, l hereunto subscribe my name this 2nd day of April it. 1)., 1910.

X. STAUB.

li itnesses Enirnn It. ConwIN. M. :3. Laniiiirnn.

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