US291310A - -benjamin f - Google Patents

Description

(NoMbdeL) E F. DILLON.

COMBINED BURGLARALAEM AND TELEPHONE SYSTEM. No.291,s10. I PatentedJaE. 1,1884.

E EH3 V WITNESSES: T IILVENIQR:

/D D W& T T V I ATTORNEYS,

N. PETERS, Hlolo-Lflhowapher. Washingtan. o. c.

UNITED STATES PATENT FFiCEt BENJAMIN F. DILLON, or SAVANNAH, GEORGIA.

COMBINED BURGLAR-ALARM AND TELEPHONE S'YSTEM.

.SPECIFIOATIION forming part of Letters Patent No. 291,310, dated January 1, 1854.

Application filed May 23, 1883.

(No model.)

To (Z5 whmn, it mtg concern:

Be it known that I, BENJAMIN F. DILLON,

. of Savannah, in the county of Ohatham and State of Georgia, have invented a new and useful Improvement in Combined Burglar-Alarm and Telephone System; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being hadto the accompanying drawing, forming part of this specification, in which the figure is a diagram View of the central office connected with a single subscribers office.

The invention relates to an improvement in 1 burglar-alarm apparatus, and its adaptation to r 5 telephone-exchanges which employ a eparate wire to each subscriber for communications between its members, and another wire common to a number of subscribers for ordinary I battery M. B, the circuit passes through relay R to point 1, which is normally in contact with key T, thence through line L to singlestroke bell B in subscribers premises, and 011 through the usual circuit-closing springs located in the various doors, windows, &c., to the earth. Local battery L B is in connection with magnet M and vibrating bell V B, its line terminating at the back of the movable lever H on the a one side, and at the fulcrum of armature-lever A L on the other. Upper lever, U L, is electrically connected with J, and V, V, and K are in electrical connection with each other.

As shown in the diagram,the main-line circuit 1s supposed to be broken in one of the circuit breaking springs inside the protected building of the subscriber, and lever H is resting on J, so as to break the local circuit L B.

Upon the completion of main-line circuit, re-

lay R will attract armature-lever A L against the lip of upper lever, U L, (which is held against insulated limiting-screw G by the tension of spring S",) thus completing local circuit, causing vibrating bell to ring and the drop D to fall, exposing the number of the subscriber, indicating in the central office that said subscriber has closed his premises. Lever H is then shifted to K, so as to break local circuit. The operator then pushes key T against contact 2, throwing main line direct to a suitable signal-battery, S B, which has the effect of causing subscribers single-stroke bell B to respond, thereby notifying him that his closing has been observed at the central office, and that the circuit is intact. Now, the key T having returned to its normal position of rest on stop 1, should an attempt be made to ground or short-circuit the line, bell B, which performs the double office of a signaling ap paratus and a resistance-coil, would be cut out of the circuit, and the decreased resistance of line would cause relay R to exert a stronger magnetic efi'ect upon armature-lever AL, sufficient to overcome the tension of springs S and S, which are adjustable, and pulling upper lever, U L, against contact-stop NV would again complete local circuit and absolutely indicate that the wire was grounded. Upper lever, U L, being pressed against \V by armature-lever A L, and W being in connection with K, it will readily be seen that the local circuit would be closed whether lever H was on J or K-acondition which could exist under no other circumstances.

The application to telephone-exchanges is made in the following manner: A two-point switch, F, is placed in the telephone exchange and one, G, in the subscribers office. To the levers of both the main or subscriber's private wire is connected, and to points 3 the wires leading to the burglarconnections, and to 4 i the telephone-switch in the central office or exchange is connected, while in the snbscrib ers office the telephoneinstrument is connected to this point. During the day these levers at both places are upon 4-. hen the subscriber desires to leave his office at night, he notifies the exchange through the call wire of his intention to leave and desires the burglarconnection made, at the same time shifting his switch to point 3. The exchange immediately makes the same change, and after exchanging signals, as before explained, is satisfied that the system is all right.

5 glar-connections will effect a wonderful saving of wire and great obstructions to streets of cities using these systems.

Having thus described my invention, what I claim as new is- 1. A combined telephone system and burglar-alarm, consisting of a telephone-line. burglarconnections at the subscribers office, a subscriber stelephone,'a two-point switch con necting alternately with the subscribers tele- 15 phone-instrument or his burglar-connections,

. and a central oflice having a telephone switchboard and local battery with burglar-alarm circuit worked by relay, as described, and a two-point switch connecting. the line alter- 20 nately with the telephone switch-board and the relay of the burglar-alarm circuit, substantially' as set forth.

2. The combination, with the relay Roperated by the main battery and adapted to be influenced by the surreptitious grounding or breaking of the main circuit in one of the subscribers oflices, of the vibrating bell and localbattery circuit, the electrically-connected contact-points V \V K, the armature lever A L, forming one of the terminals of the local-battery circuit, the switch-lever H, forming the other terminal, and the lever U L, electrically connected to point J, and provided with spring S, and arranged, as described, to be struck and deflected by the armature-lever A L, as and for the purpose described.

' BENJAMIN F. DILLON.

Vitnessos:

JAMES R.- Sn EPPARD, VVILLIAM F. KENNEDY.

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