US787358A - Burglar-alarm. - Google Patents

Description

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PATENTED APR. 18. 1905.

1 M WW 1 A DMm AAH .LN A RT mm L Patented April 18, 1905.

UNTTED STATES PATENT EEicE.

ALFRED A. DAY, OF BROUKTON, MASSAUIIUSET"S.

BURGLAR-ALARIVI.

SPECIFICATION forming part of Letters Patent No. 787,358, dated April 18, 1905.

Application filed February 25,1904. Serial No. 195,211.

be it known that I, ALFRED A. DAY, a citizen of the United States, residing at Broekton, in the county of Plymouth and State of Massachusetts, have invented new and useful linprovements in Burglar-Alarms, of which the following is a specification.

My invention relates to improvements in burglar-alarms of the detonating type, and has for its object to provide a novel, simple, and inexpensive bu rglar-alarm which will ex pose an attempt to gain entrance to a window or door to which it is applied.

\Yith this object in view myinvention consists in a burglar-alarm constructed as hereinafter described and claimed, reference being had to the accompanying drawings, in which Figure l is a perspective view thereof as applied to a window. Fig. 2 is a perspective view ofthe hammer element. Fig. 3 is a perspective view of the trigger element, and Fig. i is a plan view looking down on the burglaralarm as applied to a window.

lremising that the alarm may be connected with a door or other entrance into a house by properly positioning the parts for such change of relation, the reference-mnneral1 designates generally the hammer element of the alarm, which is secured to awindow-frame in any suitable way, as by screws. This element consists of a single pieceof material fashioned at one end to form a detonating-cap support Adjacent this support the material is shaped to provide eyes w to receive screws or similar fastening means. It is then bent to form lateral arms T, connected by a hammer guide-bar T. which incloses the space in which the hammer moves and guides the latter in its movement. form an eye w to receive a fastening device, after which it is again bent upon itself laterally toward the guide-bar T to provide a liammer-support :2, dished to form a hammerseat I and a hammer-keeper It is then tached for use.

The material is then shaped to l is provided to receive a fastening device, l and the material is then coiled to form a spring s, from which coil it extends in a free arm constituting a spring-hammer 8, adapted to initially rest in the seat 3 of the support 2 and be tripped and moved oti'of said support and partake of a guided swinging movement to the cap-support and explode the cap to sound an alarm. The end 9 of said hammer projects into the path of the trigger, next referred to. i The trigger element 10 is suitably secured to the part to which it is connected by means of screws, as shown. This trigger element is inclined downwardly and at an acute angle, and thus it has a compound incline, as shown l in the (lra\\"ings. It is inclined away from the part to which it is attached. whereby the hammer, which when released moves in the arc of a circle, may swing without coming in contact with the part to which the trigger element is connected, avoiding the necessity of providing a recess for the passage of said hammer in its swinging movements. in other words, this incline ol the trigger element reaches out toward the hammer. It is also provided with an incline at substantially right angles to that just described, so that it will engage the hammer to lift it from its seat 3 and off over the keeper, whereupon, by reason of the fact that the hammer is a springhammer, it will pass forcefully to and against and explode the detonating-cap, being guided or directed in this movement by means of the guide 7.

The burglar-alarm of my invention in the form illustrated in the drawings is constructed of wire, the keeper and hammer element being made of one integral piece of wire, as shown, and the trigger element of another single piece of wire. This results in great simplicity and economy of construction. \Vhen constructed of a singlepiece of wire, the triggel-element is seen red atone end conveniently by a screw, is then inclined downwardly at an acute angle, as shown at 10, Fig. 3, then is bent at a right angle to form the arm 11. It is then bent toward the point to which it is secured, as shown at 12, whereby the two points of attachment are in alinement, imparting rigidity and allowing the hammer to ride off freely.

While I have shown the trigger as applied to the moving part of an entrance to a house and the keeper and hammer element to the stationary part, it is obvious that the positions of these elements may be reversed or inter: changed.

Having thus described my invention, What I claim is A burglar-alarm comprising a hammer element consisting of a single piece of material formed With eyes to receive attaching devices, fashioned at one end to provide a cap-support, having laterally-bent arms connected by a hammer guide-bar, bent laterally to form a dished hammer-support, coiled to provide a spring, and terminating in afree arm constituting a spring-hammer the end of which projects into the path of the trigger; and a trigger element provided with an incline to engage and release the hammer from its support, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

ALFRED A. DAY.

Witnesses:

E. E. GOODWIN, ARTHUR L. RICH.

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