US1478024A - Combined telephone and telegraph system - Google Patents

Description

Dec. 118 11923. 11,4785QD241 H.P.CLAUSEN COMBINED TELEPHONE AND TELEGRAPH SYSTEM Filed Sept. 19, 1919 a 5i? 5% I I??? v/g 2 w E? tanner tartar (OFFHGEQ HENRY l9. OLAUSE'N,O1F MOUNT VERNON, NEW YORK, ASSIGNOR T WESTERN EIJEO-. TRIO COMPANY, INCORPORATED, OF NEW YORK, N. 1., A CORPORATION 01E NEW YORK.

' OOMBINED' TELEPHONE AND 'I'EiaEGRAPH SYSTEM.

Application filed September 19, 1919. Serial No. 324,785.

To all whom it may concern:

Be it known that l, HENRY P. CLAUsEN,

a citizen of the United States, residin at Mount Vernon, in the county of'Westc es- 5 ter, State of New York, have invented certain new and useful Improvements in Combined Telephone and Telegraph Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to improvements in signaling systems and has particular reference to a composite system which permits of simultaneous telephonic and telegraphic communication.

1 Tn systems of this character, one of the princi al obstacles to be overcome, in order that t e same will operate etficiently, is the interference between telephone and telegraph messages when sent simultaneously,

which interference results in electrical disturbances known as clicks in a telephone receiver.

An ob'ect of this invention is to provide means w ereby tele aphic impulses trans- 15 mitted from a suita le sender connected to a telephone circuit will be prevented, during certain intervals, from being impressed upon said circuit. V

In accordance with this object, an alter- 3 nating current generator of low frequency is preferably operated in synchronism with an interru ter associated with an electromagnetic evice in such manner that the telegraphic impulses produced in the telephone circuit by the generator will only be interrupted when the no-current point of the cycle of said generator is reached, at which time the interruption will be inaudible in a telephone receiver.

40 The inventive idea involved is capable of receivin a variety of expressions some of l which, or the urpose of illustrating the invention, are s own in the accompanying drawing; but it is to be expressl understood that said drawing is employed merely for the purpose of facilitating the description of the invention as a whole and not to define the limits thereof, reference being had to the appended claims for this purpose.

In the drawing, Fig. 1 1s a diagrammatic view of a composite system arranged in accordance with the invention; Figs. 2, 3 and 4: are similar views showing ditlerent forms of the invention.

65 Referring to the drawing and more narticularly to Fi 1, 1 and '2 indicate the sides of a metalllc telephone circuit of well-known formation and including the repeating coils I 3. It is to be understood that the invention is in no manner restricted to use in a metallic circuit as it is within the spirit of the invention to employ the same in other forms of telephone circuits as well. An alternating current generator, conventionally shown at 4: and preferably having a low frequency whereby the current is inaudible in telephone receivers, has one of its terminals extended by means of conductor 5- throu h the left armature and front contact of t e relay 6, when the latter is energized, to an induction coil 7. The other terminal of the enerator l is extended by conductor 8 to in uction coil 9 so that when the relay 6 is energized the circuit for the alternating current generator will be closed and current induced from the coils 7 and 9 into the adjacent repeating coils of the telephone circuit and from thence over the sides 1 and 2 of said circuit. The deenergization of relay 6 will, at its left armature, open the transmitter circuit by breaking the circuit for generator 4.. when the same is at the no-current point of its cycle.

Associated with relay 6, the energization of which is under the control of a telegraph key 10 of ordinary construction, is an interrupter, conventionally shown at 11, operated in any well-known manner, in synchronism with the alternating current generator 4: so that the brush of the interrupter will engage the insulated segments thereof when the no-current point of the cycle of said generator is reached. A sounder 12 is provided at each receiving station and is operated in the well-known manner, by the impulses transmitted by the sender key 10, the

winding of the sounder relay being connected to conductor 8 on one side of generator 4: and to the front contact of the left armature of relay 6 on theother side of said generator. t is now believed that the operation of the form of the invention shown In Fig. 1 will be full understood from the f0.- lowing detailed escription.

When the key 10 is depressed to transmit a telegraphic lmpulse, a circuit is closed from the positive tact of key 10 an winding of relay 6 to negative pole of battery. Relay .6 energizes and locks up through its winding, right gole of battery 13, con- Tilt) armature and front contact and the conducting segments of the interrupter 11. By attracting its, left armature, relay 6 closes a circuit through the alternating current generator so that the current therefrom is impressed upon. the telephone circuit. Each time the brush of the interrupter engages an insulated segment thereof, it will be apparent that the is broken but if key 10 is depressed when said insulated segments are engaged, the energizin circuit of said relay, remaining closed, w' I prevent the same from releasing. Should key 10 be released while the brush of the interrupter is engaging the conduct- 7 ing segments thereof, relay 6 will remain graph circuit at freceiver i f the-telephone for conversationallocked up until an interrupter is engaged by the brush thereof, at which time the locking circuit for relay 6 is opened and the same releases its armatures. When the left armature is detracted the circuit through generator will be broken tointerrupt the transmission of alternating current from the induction coils 7 and 9 into the adjacent windings, of the repeating coil and from thence over both sides of the telephone circuit to a sounder 12 at a receiving station. As previously pointed out, generator 4 and interrupter 11 are constantly operated in synchronism and the brush of the interrupter will only engage the insulated segments thereof when the no-current point of the cycle of the generator isreached. Consequently relay 6 will only deenergize to break the circuit of the generator at the nocurrent point of its cycle with the resultthat the Interruption o the alternating current impulses will cause no electrical disturbance, such as clicks, in a telephone circuit is being employed simultaneous] lie impulses transmitted over purposes. T

' the sides of the telephone circuit will be induced from the windings of repeating coil 14 into the windings 15 and 16 of the telea receiving station and from thence through the winding of the sounder. relay.

In Fig. 2, the operation is substantiall the same as described in connection wit Fig. 1 with the exception that the winding of relay 6 is in series with the interrupter 11. is causes the opening of the locking c rcuit of relay 6 and conse uent deenergization thereof each time the brush of the interrupter engages an insulated segment. To prevent an interruption of the alternatmg current impulses when relay 6 releases, should the sender key 10 at this time be depressed, said key is rovided with an addit onal contact 17 w ich will maintain the circuit of the generator 4 closed until the brush of the interrupter again engages a conducting segment, whereupon relay 6 will left locking circuit for relay 6' insulated segment of the the alternating current again be energized. It is therefore ap parent that while the key 10 is depressed, the impulses will not be interrupted to operate the sounders 12 by the release of the armature of relay 6. However, if the key 10 is released while the brush is on a conducting segment of the interrupter, the relay will remain locked up until an insulated segment is engaged by the brush, at which time the generator circuit will be opened and the impulse circuit interrupted.

The relay 6 of Fig. 3 has a double winding; is energized through either of them; and is locked up through the right one. The circuit through the left winding and additional cont-act 23 will prevent the relay from releasing if the key 10 is depressed when the brush of the interrupter en ages an insulated segment. The relay 0 each sounder 12 is normally grounded through the alternate contact of relay 6 and resistance 24 and through the secondary winding 25 of an in- ,duction coil, left ,armature and alternate contact of relay 6 when said relay is energized, said sounder being connected to the windings 19 and 20 of the repeating coil through resistances 21 and 22. The operation of the circuit in Fig. 3 will be obvious when considered in connection with that of the previously described figures.

In Fig. 4, the relay of each sounder 12 ounded, on one side, through the secon ary winding 18 of an induction coil in the circuit of generator 4 and is connected on the other side, to the windings 19 and 20 of the telephone circuit repeating coil through resistances 21 and 22, respectively. The arrangement of the sending apparatus and operation thereof is the same as in Vhat is claimed is:

1. In combination, a line, an alternating, current generator associated with said line but normally ino rative to impress current on said line, a te egraph sender, a relay associated with said sender and operating in response to the actuation of said sender to cause said generator to be operative to impress alternating current signals on said line, an interrupter, a common control means for operating said generator and said interrupter, said interrupter being in circuit with the winding of said relay to maintain said relay in condition to keep said enerator operative after the actuation of said sender has ceased, and for controlling said relay to render said generator inoperative only at the instant that the alternating current of the generator is at the zero point of its cycle.

In combination, a line, current generator associated but normally inoperative to impress alternating current thereon, a tele aph key, means controlled by the actuation of said key for causing said generator to with said line,

an alternating be opera- 180.

aavepaa tive to impress alternating current impulses on said line,and means for maintaining said generator operative after the actuation of sald key has ceased, and for rendering said nerator inoperative to impress alternatlng current on said line only at the instant the alternating current wave of the generator is at the zero point of its cycle, and a common control means for operating said generator and said last mentioned means.

3. In a combined telephone and telegraph system, comprising a line adapted to receive telephone signaling currents, an alternatin current generator associated with said i ine but normally inoperative to impress alternating current upon said line, a relay, a telegraph key for controlling the energization of said relay, a locking circuit for said relay comprising a continuously driven interrupter, a common control means for operating said interrupter and said generator, and contacts controlled by said relay for rendering said generator operative to impress alternating current upon said line, said interrupter being synchronized with said generator to maintain closed said locking circuit for said relay after the actuation of said telegraph key has ceased, and to open said energizing circuit only at the instant the alternating current from said generator is at the zero point of its cycle.

In witness whereof I hereunto subscribe my name this th day of September, A. D., 1919.

HENRY P. CLAUSEN.

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