USRE13795E - Signaling system - Google Patents

Description

I E. R. GILL.

SIGNALING SYSTEM. APPLICATION FILED AUG.16, 1913.

Reissued Sept. 1, 1914.

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UNITED STATES PATENT orrion.

I n. GILL, or YONKERS, NEW YORK, assrenon, BY mnsna ASSIGNMENTS, T

HALL SWITCH & SIGNAL COM FANY,

A oonrons'rronor MAINE. I I

SIGNALING SYSTEM.

Original No. 1,018,781, dated March 12,

To all whom it may concern:

Be it known that I, EDWIN R. GILL, a citizen of the United States, and a resident of Yonkers, in the county of VVestchester and State of New York, whose post-oflice address is Yonkers, New York, have invented certain new and useful Improvements in Signaling Systems, of which the following is a specification.

This invention relates to signaling systems, and more particularly to such systems 3 as are adapted for railroad train despatchfor impressing current thereon,

ing. One of the objects thereof is to provide means whereby undesirable interference with an instrument such as a telephone, due to the impressing on the line of a current from a source thereof, may be reduced to a minimum.

Another object is to provide for impression upon the line of signaling impulses, without interference with the normal operation of the telephonic instruments, or vice versa.

A further object is to modify the rise and fall of battery current impressed upon the line to actuate a signaling device, of an induced current impressed upon the line by the operation of the signaling device, where by interference with speaking currents on the line is prevented.

Further ob ects will be in partobvious,

and in part specifically adverted to in the course of the following specification.

In the accompanying drawing, which 1s to be taken as a part of this specification, and

-in which I have shown schematically a merely preferred form of embodiment of the invention, the figure represents a telephone line, tively operated signaling devices, together ,with types of the adjuncts'essential to the successful achievement of the objects preunised.

'lector is shown at having included therein selec- Specification of Reissned. Letters Patent. Reisued Sept, 1 1914 1912, Serial No. 488.314. application for reissue filed August 16, 1913. Serial No. 785,172.

applied to or withdrawn from the line in such-manner that no audible effectis pie duced upon the telephone 7, connected in bridge of the line, I employ devices for slowing down the rate which the battery currents rise and fall, such devices com; prising-inductive resistance or retard coils. One of these impedancesis inserted between the armature 8 of the relayv and the line, and a second impedance 10 is located between the battery and the line. This second coil, because of the location, protects the battery in case of accident, from short circuit. A condenser 11 is placed between the armature 8 of the relay and one side of the line and a condenser 12 is located in the bridge of the telephone 7.

The signaling instrument employed in the present system comprises an electric bell 14,

included in a local circuit 15, having a bata circuit closer 17.

In the present embodiment of my invention, the operation of circuit closer 17 is selectively'determined by means connected in bridge'of the line, through the instrumen tality of sender key 5 and relay 6. The se- 18, and although various types of instruments adopted for thispurpose may be used, I preferably employ an instrument of the kind disclosed in Letters Patent No. 906,523, grantedto me December 15, 1908. This selector includes a magnet 19 and a coil 20 on said magnet, the latter being connected at 21 with a battery terminal and with the circuit closer 17, which cotiperateswith a bell contact 22 to terv 16, said circuit adapted to be closed by close the ringing circuit 24. The operative circuit 25 of the main line includes a coil 26 on magnet 19, and in the present instance coils 20 and 26 are distinguished from each other by the use of heavy and light lines to designate them respectively. Retard coils 27 and 28 are arranged in series between the terminal of the selector and the'line.

, Having thus described my improved signaling system, the operation thereof may nowbe understood. 'When the relay 6 is operated, the battery 2 begins to charge the condensers, the potential between the armature of the relay and the line rising slowly,

while the impedance in the line circuit tends a still further reduce the rate of current increase. Accordin ly since the current rises and falls very-sl wly' the ortion thereof which passes through the to ephone apparatus, does not interfere with the normal operation of the latter. The battery circuit, therefore, may be worked simultaneousl upon theline so as to operate a device, sucli as the selector shown herein, without the telephone or said selector interferin others operation. When the ringing t*ircuit 24' isclosed by the operation of the selector, the interrupted current-set up in said circuit by the vibration of the bell armature, passing through the coil 20, which acts as a primary, cooperates with .the magnet to set up an induced current in the main line, which current, acting upon the telephone apparatus connected in bridge of the line, might interfere with the voice currents transmitted to or from such apparatus but such interference is minimized by the insertion of the impedance in the bridge of the selector circuit.v The impedance also insures that the operation of the selector mechanism shall not be anywiseaflected by the voice currents. i

It will be apparent that by the use of the system described audible annoyances and undesirable interference ordinarily caused by battery or current changes are overcome, permitting the simultaneous operation of telephonic apparatus and the signal devices over a single line, in an entirely efficient manner. It will also be apparent that the provision of the impedance serves to protect the various instruments from lightning.

As many changes could be made in the above system, and many apparently Widely different embodiments of this invention could be made without departing from the scope thereof, it'is intended that all matter contained in the above description or shown in the accompanying drawings shall" be taken as illustrative, and not in a limiting sense.

Having thus described my invention, what I-claim as new and desire to secure by Letters Patent, is

1. A system adapted for the simultaneous operation of message receiving instruments and selective signaling devices, comprising parallel lines, impedance in series with saidlines, a protective short circuit across said lines comprising suitably proportioned capacity and inductance in series, message receiving instruments in bridge of said lines, a condenser iii said bridge, selective signaling devices in bridge of said lines, and im- ,pedance in said last bridge.

2. A system adapted for the simultaneous operation of message receiving instruments and selective signaling devices, comprising parallel lines, impedance in series withsaid with . said selector and said lines, impedance in said llamas lines-,condensance in bridge -of said lines-,

message receiving instruments in brid'g'e of' said lines', condensan'ce insaid bridge, selective signaling devices in bridge of said lines, and impedance in said last bridge disposedbetween said selective device and; eac'libf said lines."

'3. A system adapted for the simultaneousoperation of message receiving instruments and selective signaling devices, comprising parallel lines, impedance in series with said lines, condensance in bridge thereof, a message receiving instrument in bridge of said lines, a condenser in said bridge, an induc tive selector in bridge of said lines,- and alocal circuit including a signal adapted to be controlled by said selector.

4-. Aisystem adapted for the simultaneous operation of message receiving instruments and selective signaling devices, comprising parallel lines, impedance in series'with said lines, condensance in bridge thereof, a' message receiving instrument in bridge of said lines, condensance ance in said bridge and arranged between each of said lines, and a local circuit including an alarm device con.- trolled by said selector. p 5. In a system adapted for the simultaneous operation of telephones and selective signaling device, in combination, a circuit} comprising parallel lines, means for in; pressing currenton said lines, a key operatcd relayfor controlling the impression of current upon said lines, a telephone in bridge of said lines,-conde nsance in said bridge, an inductive selector in bridge of bridge, local signal comprising an alarm circuit for the local signal controlled by said selector. I g

6. In a signaling system of the class described, in combination, a line comprising metallic sides, a selector in bridge, of said lines impedance in' said bridge, a local-cit cuit comprising a local signal adapted to be closed by selector, telephone apparatus in bridge of said line; a condenser in said bridge, a battery, a relay for applying said battery to the line, and impedance located between the battery and the line.

7. In a system adapted for the simultaneous operation of telephones and selective signaling device, in combination, a circuit comprising parallel-lines, means for im pressing current on sai lines, a key operated relay for controlling the impression of current upon said lines, devices in series with said lines, a1' condenser in bridge thereof, a telephonein bridge with said lines; a condenser in said bridge, an in-' ductiveselector in bridge of'sa'id lines, impedance in said bridge, a localsi'gnal comin said bridge an. induc-j tive selector in bridge of said lines, impeddevice, and a a plurality of impedance pulses on said line,

- While a cali prising in said. last bridge one of said'devices-being located between each of terminals of the selective'device and one of said lines, a local circuit, and an alarm in said local circuit,

the operation of yvhich is determined by thecpening and closing of said local circuit by said selector.

D. In a selective signaling system the com bination of a line uniting a calling station and plurality of called stations, a-signal at each called station including means to an answer-back signal to the calling station over said line by varying the oten tial on said line, telephones on saidline, a selector controlling said signals in response to calling impulse impressed on said line,-

means for impressing abrupt calling impulses on said line and means for modifying the nature of the calling impulses and the answer-back variations phonic communication over said line may be had while a call, including an answer-back, is being sentover the same circuit without substantial interference.

10. In a selective signaling system, the combination of a line uniting a calling station and a-plurality of called stations, an electromagnetic signal at each called. station including means to give'an answer-back signal to the calling station over said line by rapidly and abruptly varying the electrical condition of said line, telephones across said line, a selector at each called station controlling thesignal thereat in response to calling impulses impressed upon said line, means for impressing abrupt calling immeans modifying the nature oi the calling impulses and the efiect of the answer-back signal on by telephone communication may be had including an answer-back sig-- nal, is being sent over the same circuit Without substantial interference.

' combination of a line .li. In a selective signaling system, the

uniting a calling staof called stations, an

at each called station and a plurality electromagnetic signal tion including means to give an answer-back signal to the calling station over salddine by rapidly and abruptly yarying the potenline and impe lines, a condenser in saidwhereby tele-' abrupt impulses on said line,

the line, Where-- tial of said line, telephones connected across said line, a selector at each called station controlling the signal thereat in response to calling impulses impressed on said line;

meansfor impressing said impulses on said dance and capacity on said line, whereby 4 he abrupt calling impulses and the abrupt potential changes on the line caused by the signal durin the answenbaclr are so modified that telep onic communication may be had While a call, including the answer-back signal, is being'sent over me same circuit without substantial interference. l

12. In a selective'signaling system the combination'of a line uniting a calling station and a plurality of called'stations, a

signal at each called station including means to give an answer-back signal to the calling station over said line by initiating rapid abrupt impulses on' said line, telephones across said line, a selector connected to said line at each called station controlling the signal thereat in response to specific impulses impressed on said line, means at the calling station for initiating abrupt calling impulses on said line, and means at the calling' and called stations for modifying said calling and answer-back impulses so that telephonic communication may be had while a call, including'an answer-back, is being sent over the same circuit without uncomfortable interference.

13. In a selective signaling system the combination of a line uniting a calling station and a plurality of called stations, a signal at each called station including means to give an answer-back signal to the calling station over said line by initiating rapid telephones across said line, a selector connected to said line at each called station controlling the in response to specific imsignal thereatpulses impressed on said line, means at the calling station for initiating abrupt calling impulses on said line and impedance at the calling station and and condensance common to both impedances whereby conversation may be had.

While a call including an answer-back is being sent over the same circuit With-out uncomfortable interferencer 14. In a selective signaling system, the combination or a line uniting a calling station and a plurality of called stations, means at the calling station for initiating abrupt calling impulses on said line, a signal at the called station responsive to said impulses and including means rupt answer-back impulses on said line hile responding to said calling impulses, telephones across said line, impedance in the line at the calling station and impedance in bridge of the line at the called station,

at the called stations,

to initiate rapid -aband cohd ensancain bridge of said 'li'ne,- T c In testimony'whereof, I have signed my whelrebyithc character-0f the calling and an namc'ro this specification, in the presence swcr-bmk impulsesis so modified that conof twc subscribing witnesses. versation may be-had-"whilcacali, includ- 1 1 ing an answepback, is being gang over the Witnesses?- samc circuit withdut lmcomffcrtablqe inter- NEWTON A. BURGESS,

. EDWIN SEGER.

I EDWIN acing-Q ference.

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