US179326A - Improvement in burglar-alarms - Google Patents

Description

J. S. MACE. Enema-MAM;

PaQtented June 27. 1876.

m'ms'sis:

N PEI'ERS. PHOTO UTHOGR WASHINGTON, c, c.

JOHN S. MACE, OF OHILLIGOTHE, OHIO.

e V IMPROVEMENT IN BURGLAR-ALARMS.

Specification formingpart of LettersPatent N 0. 179,326, dated June 27, 1876; application filed May 17, 1876.

To all whom it may concern Be it known that I, JOHN S. MACE, of Ohillicothe, in the county of Ross and State of Ohio, have invented a new and Improved Burglar-Alarm; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which the figure is a side elevation.

My invention belongs to that class of burglar-alarms in which an alarm is sounded upon a bell by a hammer set in motion by a clockspring and spur-gear by the opening of the door or window to which it may be applied.

The invention consists in the particular construction and arrangement of a stop-rod pivoted to the frame-work of thedoor, so as to engage with and stop the motion of one of the wheels of the alarm mechanism, and attached below to a slide on the door-frame, which is pushed against a projection on the door by a spring, so that when the door is opened, and the projection removed from the end of the slide against which it abuts, the spring forces the slide out, and, by removing the upper end of the stop-rod from the wheels of the alarm mechanism, allows the latter to operate.

The invention also consists in the particular construction of a locking-key, combined with the above mechanism, so as to prevent the projection of the slide when turned in one position, and permit the projection of the slide and giving of the alarm when turnedin another position.

In the drawing, A represents the side of a house, and B a door hinged thereto, to which, for the sake of illustration, my devices are shown applied. D is a bell, and C an alarm mechanism, consisting of a hammer mounted upon an oscillating pallet, a spur-gear, and a spring with ratchet and pawl, all contained in a frame, and of substantially the same construction as the ordinary clock-alarm mechanism.

The alarm mechanism is connected, through a rod, E, with a slide, F,Which moves in guides a a, and is forced inwardly against a projection, b, upon the door by means of a spring, G. The rod E is attached to a plate, 0, which is pivoted to the side of the house so as to form a lever, and its upper end is bent so as engage with the teeth of one ofthe gear-wheels, and hold the wheels against the action of the spring, to prevent the giving of the alarm until the proper moment. The spring G is attached at its upper end to the slide, and consists simply of a twisted flat spring, which, when the door is opened and the projection I) removed from the end of the slide, forces said slide inwardly, and, by deflecting the pivoted rod 'E, removes its upper end from the notches -of the wheel, and permits the coil-spring to exert its force upon the hammer and sound an alarm upon the bell.

When it is not desired to have the alarm sound upon the opening of the door, as in the day-time, a locking device must be provided to hold back the slide F, and for this purpose I have provided a simple form of key, H, swiveling upon its shank in the casing of the door, and so arranged that when it is parallel with the spring G the latter-will act to force the slide .in and give the alarm, and when turned at right angles it bears against the spring, and operates as a stop to the movement of the spring, to prevent the projection of the slide, consequently locking the alarm.

The alarm, asthus described, is to be applied to doors and windows of all kinds, to safes, private secretaries, 850., and, being certain in its operation, will afford a reliable protection against the attempts of burglars and thieves by arousing the inmates.

I am aware of the fact that burglar-alarms have been constructed with a slide which, when the door is opened, is driven inwardly by a spring to release and set in operation the alarm mechanism; but in this case the slide is held to the door-frame by a hook which passes around a pin on said frame, and the arrangement is such that when it is pushed oft of the pin it cannot be made to automatically re-engage the same by the closing of the door, so as to stop the alarm, while with my devices the end of the slide is beveled or curved, so as to be automatically forced back 'by the projection on the door when the latter is closed, and thus locks the alarm, the advantages of which arrangement are that the slide does not, as in the case referred to, have to be locked before the device is wound up,

and the occupant of the house, moreover, is always apprised of the condition of the door, the alarm sounding whenever it is open, and stopping as soon as it is closed, by reason of the automatic arrangement of the stop mechject said slide, and the door having projection b, adapted to abut against the spring-pressed slide, as and for the purpose described.

2. The combination, with the alarm mechanism, the spring G, slide F, and rod E, of the key H, swiveling in't'he door-frame upon .its shank, and adapted to lock the slide or not-according to the position which it is made to assume, substantially as described.

JOHN S. MACE.

Witnesses:

W. E. BUsER, AUGUST F. BUSER, Jr., R. D. MCDOUGAL.

Images