US225271A - Chaeles h - Google Patents

Description

G. H. CARTER.

Electric Burglar-Alarm.

No. 225,271. Patented Mar. 9, I880.

N-PETERS. FHOTOLIUWGRYAPHER. WASNINGTON, D. C.

UNITED STATES PATENT OFFICE.

CHARLES E. CARTER, 0F RRooKLYN, NEW YORK.

ELECTRIC BURGLAR-ALARM.

SPECIFICATION formingpart of Letters Patent No. 225,271, dated March 9, 1880.. Application filed December 16, 1879.

To all whom it may concern Be it known that I, OHARLEs H. CARTER, of Brooklyn, in the county of Kings and State of New York, have invented an Improved Electric Alarm for Fires, Burglars, &c., of which the following is a specification.

I make use of an open circuit to the window, door, thermostat, or other place where an alarm is to be operated, and when the circuit is closed the current from the battery acts in the electro-magnet and moves a circuit-changing device, so that the instrument is converted into an automatic electric alarm that continues to sound until set, the same being made independent of the opening or closing of the port-ion of the circuit that extends to the window, door, or thermostat.

By this means the alarm will be given and continue, and the closing of the door or window will not cause it to stop, and only one battery and one electro-magnet are made use of.

In the drawings, Figure l is a side view of the instrument with the bell in section, and Fig. 2 is a diagram of the circuit connect-ions.

The electro-magnet a is provided with an armature, Z), swinging on pivots c, and carrying the spring-arm and hammer cl for the bell f.

The contact-screw e and spring 0 on the armature are of the character usual in automatic electric alarms.

The lever g is provided with a rod, h, passing through the bed B of the instrument. It is raised by the spring 2, so that the end of the lever g is made to bear upon a projection, 4, upon the hammer when the hammer is not acted upon by the magnet; but when the hammer is moved the projection 4, passing from beneath the end of the lever g, allows the spring 2 to lift the rod h, and by a pin, 5, that projects from said rod h, bring the insulated circuit-closing spring Z into contact with the spring 0.

Upon reference to the diagram, Fig. 2, the operation of this instrument will be understood.

The battery A is connected to the posts 7 and 8. The post 7 is insulated, but the post 8 is in contact with the metal base. The dotted line 9 represents this circuit-connection through the base to the pivots c of the armature 12,-] thence the current passes by the bellarm d, lever g, and insulated wire 10 to the post 11, and to the various windows, doors, or thermostats, the same being indicated by a circuit-closer at r, and the return-circuit is to the binding-post 12 and wire 13, to the electro-magnet a and wire 14, to the post 7 and battery. If, now, either of the alarm-circuit closers is operated by opening a door or window, or otherwise, the circuit is completed at r, the magnet on attracts the armature b, strikin g the bell. This moves the projection 4 from beneath the lever g, the spring 2 acts, raising the rod h, and by the pin 5 bringing the spring l into contact with 0 and closing a local-circuit through 9, armature b, contactpoint 6, wire 16, springs 0 and l, to 12 13, electro-magnet a, and Wire 14 to 7 and battery.

The motion of the armature opens and closes the circuit by making and breaking contact with the spring 0 and points and ringing the bell automatically and continuously until the circuit between l and 0 is broken and between lever g and hammer-projection 4. It is restored bymoving the rod h downwardly, so that the latch end on the lever g presses back the hammer-projection and the latter springs back beneath the lever. By this arrangement of circuits the continuous alarm is insured and the instrument rendered very simple.

The circuit-closin g springs 0 [may be placed near thebell instead of below the base.

I claim as my iuvention l. The combination, with the electro-magnet and alarm, of the circuit-closing springs 0 l, lever' g, hammer, circuit-wires, armature b, and contact-point e for the armature, substantially as. and for the purposes set forth.

2. The combination, in an electric alarm, of one battery, one electro-magnet, alarm mechanism, a main open circuit, a local circuit, and circuit closing devices, substantially as set forth, whereby the closing of the main circuit causes the electro-niagnet to operate the mechanism that disconnects the main circuit from the electro-magnet and establishes a local circuit from the same battery through the same electro-magnet to give the alarm, substantially as specified.

Too

Signed by me this 15th day of December,"

CHARLES H. CARTER.

Witnesses WILLIAM G. MOTT, GEo. T. PINOKNEY.

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