US129698A - Improvement in portable burglar-alarms - Google Patents

Description

J. N. WEBSTER & D. FEY. Improvement in Portable Burglar-Alarms.

l\lu.129,698, l Y PatentedJulyza-,iwz

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JOHN N. WEBSTER AND DAVID FEY, QF PEORIA, ILLINQIS.

IMPROVEMENT IN PORTABLE BURGLAR-ALARMS.

Specication forming part of Letters Patent No. 129,698, dated July 23, 1872.

To 4all whom it may concern Be it known that we, J onN N. WEBSTER- and DAVID FEY, both of the city of Peoria,

in the county of Peoria, in the State of Illinois, have invented a Portable Burglar-Alarm 5 and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the annexed drawing making a part of this specificatiomin which like letters of reference refer to like parts, and

in which- Figure 1 represents a perspective View; Fig. 2, a plan-the bell-removed; Fig. 3, an ideal longitudinal sectional elevation, the spring being partially removed to show the wheels.

This invention consists of a small apparatus, (which travelers may carry about their persons,) which is placed at or near an inclination of forty-live degrees against the door of a-room, resting its other end upon the door,

l so that pressure of the door of the chamber inward against a sliding frame, which forms one end of the apparatus, releases the detent 'of the attached alarm, and rings or sounds the same, and which ceases when the pressure from the door isv stopped, but resumes the alarm 'on the repetition of the inward pressure of said door.

A A represent two parallel plates of metal or other hard material, each about five inches lon g-one broad, and, if of metal, one-sixteenth of an inch thick--fastened together parallel, at a short distance asunder, by transverse braces aa a. A spring, i, is attached to one of the stays, the other end being coiled upon an axle, b, which terminates in a square end, which lits a key, by which the spring is wound. Upon this axle b is set a cog-wheel, h, which is held in place by a ratchet, p, and pawl k and a spring. This wheel engages-with a lantern-wheel, g, or a similar'wheel `on the axle-c of the cog-wheel f, in the teethof l which the detent e is engaged. This detent is set vertically against the wheel in a common mode on an axle, d, which carries an* arm, o, which rests at its extremity against the detent fr on the lside of the sliding frame B. The latter consists of two parallel bars or plates, B B, united at Itheir outer ends by a transverse brace, q, and sliding, respectively, against the inner sides of the plates A A upon the ends of the braces a a, which secure Slots are cut in each plate B B- Ato allow the latter to be pressedfar enough said plates.

inward to carry the detent r beyond the alarmdetent o. A spring, s, having its convex side against one of the braces a near the axle d, and its extremities against the outer end of the inner slots of the plates B B, (see Fig. 2,) keeps the frame B B constantly extended beyond the end of the plates A A. A detent, r, on the inside of one of the plates B B holds the end of the alarm-rod o,`and a hammer, m, is attached to the same axle which carries the latter rod o. The bell C or other alarm` sounder is supported above the apparatus over the hammer m by a standard, fn, fixed to one of the plates A A.

The operation of this portable alarm for bed-room doors is as follows: The apparatus is placed in the angle formed by the junction of the closed door andthe floor of the room, near the free end of the former, (see Fig. 1,) resting at one end on the floor, and inclining against the door at or about an angle of fortyfive degrees, where it will maintain its position by means of its sharp corners D D`.` (See Fig. 3.) Now, on forcing of the door E inward toward the room the pressure drives the sliding frame B B into the apparatus until the detent r releases the arm o of the axle d, which latter and its attached detent e ceases to retain the wheel f, which is turned by the wheel h acting on the drum g, said wheel h being fixed on the same axle b which carries the spring i, so that thedetent e, being now free to vibrate in the teeth of the wheel f, carries with it the axle d and its hammer-wire l and hammer m, and rings a peal of blows upon the bell C, which ceases when the pressure upon the door is stopped, but commences when the same pressure is applied as before. The mechanism of the alarm proper is similar to that of the alarm-clocks, and is the simplest form that can be advantageously used in this device.

What I claim as my invention is--f 1. The burglar-alarm, sounded by pressure of a door or lloor of a room against a retractile frame, B, connected with an alarm-detent, o, and an attached alarm mechanism, substantially as described, and forthe purposes set forth.

2. The combination of the retratile frame burglaralarn1 We have hereunto set our hands B B, its detent r, and spring s, or equivalent, this 6th day of June, A. D. 1872. with an alarm-sounding apparatus, consisting JOHN N. WEBSTER.

of plates A A, arm o, axle d, detent e, Wheel DAVE) FEY. f, drum g, Wheel h, ratchet p k, axle b, hammer m, and bell C or other equivalent, sub- Witnesses: stantally as and for the purposes set forth. JOHN PETERMAN,

WM. J ACK.

In testimony that we claim the foregoing

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