US515851A - woodard - Google Patents

Description

(No Model.)

I A. N. W-OODARD.

BURGLAR ALARM.

No. 515,851. 4 Patented Mar.6,1894.

UNITED STATES PATENT Prion.

ALVIN N. WOODARD, OFMANSFIELD, OHIO, ASSIGNOR OF ONE-FOURTH TO LEWIS REED, OF SAME PLACE.

BU RG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 515,85}, dated March 6, 1894.

Application filed May 5, 1893- Serial No. 73,132. (llo model.)

To all whom it may concern..-

Be it known that I, ALVIN N. Woonnen, a citizen of the United States, residing at Mansfield, in the county of Richland and State of Ohio, have invented a certain new and useful Improvement in Burglar-Alarms, of which the following is a full, clear, and exact description.

The object of this invention is to provide a to cheap but reliable burglar alarm, more especially for use in country places, but which, oi course, is not limited in its application to any locality.

In the preferred 'formof my invention, I 1 5 employ a double-barreled spool provided with a cord wound bout one of its barrels, so that by pulling upon said cord the spool will be rotated in one direction, and having a weight suspended 2c the other barrel in the reverse direction so that the unwinding of one cord will wind the other. This double-barreled spool is combined with a pawl and-ratchet let-off mechanism adapted to be actuated or released by I 2 5 the opening of a door or window, and is also combined with a bell or equivalent alarm mechanism, all asI will proceed now more particularly to set forth and finally claim.

, In the accompanying drawings illustrating go my invention, in the several figures of which like partsare similarly designated, Figure l is an elevation of a complete apparatus, saving that the cover of the casing is removed. Fig. 2 is a side elevation, with part of the eas- 5 ing broken away; and Fig. 3 is a side elevation looking at the side opposite to that in Fig. 2, also with part of the casing broken away.

The casing consists of a back-plate a, by

. 4.0 which the apparatus maybe mounted in suitable position, as by means of screws 19 passed through holes in cars c of said back-plate; side-pieces d projecting from said back-plate at substantially right angles, and a face-plate 4.5 or cover c, the latter being removed in Figs. 1 and 2, and being shown in section in Fig. 3. Secured to the back plate a is a rectangular bracket f, the sides f of which form bearings for the shaft 9 of the double-barreled spool 72,. go This spool may be'made of wood or other material. The cord '5 is wound in one direction by a cord which is wound about upon one of the barrels of this spool, and a cord 7' is wound in the other direction upon the other of said barrels, and said cord 3 is provided with aweight 70. One end of the spool is provided with a ratchet Z,-and this ratchet is engaged by a pawl 1n, pivoted to one of the side-pieces d of the casing. At its other end the spool is provided with an eccentric or crank n, link 0 with the bell-hammer lever 19 of the bell q, so that the rotation of the spool in either direction will serve to actuate the bellhammer lever to sound the bell. The pawl m may be operated in a variety of ways, and Ihave shown two suchways. In Fig. 1, the cord 0 leads over pulleys s to a door t, to which it is fastened, as, for example, bya screw-eye u. If the cord r be stretched between the pawl m and the door, at its full length, then obviously the opening of the door will pull upon the cord and hence raise the awl out of its engagement with the ratchet Z, and thus the weight It will be free to act to rotate the spool, and so sound the alarm. Now, in order to keep the cord 0" taut, and, at the same time, take up any slack, there may be interposed in it at any suitable place or places one or more pieces 1/ of elastic or elastic cord, or coiled spring, or other resilient medium. The pawl may be a gravity pawl and returned by gravity into engagement with the ratchet. i

The form of the apparatus so far described relates to the employment of the alarm apparatus itself at one point, while the connection with the door or other opening is at a distant point, as, for example, the alarm mechanism may be in a bed chamber while the door may be a front or rear door of a dwell- 9o ing some distance from the bed chamber. It is obvious that as many alarms may be arranged in a given place as there are openings to be protected.

I prefer to employ in connection with my 5 alarm the guides or ways or troughs, w, w, for the cords and weight, and in case a number of alarms are arranged in a given place, these troughs may also receive cards to indicate the opening with which that particular 10o alarm mechanism is connected. If the alarm be arranged at the point to be protected, say,

which is connected by a 60

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