US349911A

US349911A - Fire and burglar alarm

Info

Publication number: US349911A
Authority: US
Publication date: 1886-09-28
Anticipated expiration: 1903-09-28

Description

(No Model.)

L. E. THOMAS & I. WOOD.

. FIRE AND BURGLAR ALARM.

No. 349,911. Patented Sept. 28, 1886.

WITNESS 0 INVENTO ATTORNEYS.

N. PETERS. Phomulho m hur. Walhingtnn. u. C.

UNITE TATEs PATENT FFicE.

LEANDER E. THOMAS AND IRA WOOD, OF SHELL LAKE, \VISOONSIN.

FIRE AND BURGLAR ALARM.

SPECIFICATION forming part of Letters Patent No. 349,911, dated September 28, 1886.

Application filed January 20, 1886,

To all whom it may concern.-

Be it known that we, LEANDER E. THOMAS and IRA \VooD, of Shell Lake, in the county of Vashburn and State of \Visconsin, have invented anew and Improved Fire and Burglar Alarm, of which the following is a full, clear, and exact description.

Our invention relates to an automatic fire and burglar alarm, the object of the invention being to provide amechanical structure which may be set up in any part of a building or apartment for the purpose of sounding an alarm in case of fire, or in case burglars or other unauthorized persons should enter the said house or apartment.

To the ends named, the invention consists of certain improvements in that class of burglar alarms which have an ordinary clockwork-alarm mechanism, in which the escapement-lever is held in engagement with the escapemeut-wheel by means of an arm fixed to said escapement-lever and upheld by a cord that is fixed to awindow or door that is likely to be opened, or carried to aposition where it is likely to be subjected to the action of the flames should a fire occur in the building or apartment, as will be hereinafter fully described, and specifically claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure l is a face view of our improved burglar alarm, the inclosing-case being represented in section, and certain portions of the clock-work mechanism being cut away to disclose the construction of the parts and Fig. 2 is a side view of the same, in which the inclosing-case is also shown in section.

In the accompanying sheet of drawings, A represents a panel arranged to be fixed in position against the wall of the apartment, and B an inclosing case or box that is secured to the outer face of the panel. The clock-workalarm mechanism is secured to the panel A, said alarm mechanism consisting, essentially, of a mainspring, a, a ratchet-wheel, b, a main driving-wheel, c, a pawl and spring, 6 and], respectively, a pinion, an escapement-wheel, h, and an escapementdever, 7c, carrying a bellhammer, Z, arranged to strike upon a bell, O, that is fixed to the panel A below the clockwork mechanism. A lever-arm, m, is rigidly Serial No. 189,748. (No model.)

fixed to the shaft of the escapement-lever k, and in the end of this lever at there is formed an eye, n, within which there is secured a cord, 0. This cord 0 is passed upward and through an eye, 1), then downward to form a loop, q,a weight, D, being fixed to the cord at the lower end of the loop. From the loop q the cord 0 passes onward and upward through a second screw-eye, 7*, out through the top of the case B, so that it maybe led to the door, window, or other point to which it is to be secured. From this construction it will be seen that when the cord 0 is under tension the lower catch-tooth, s, of the escapement-lever It will be held in engagement with the teeth of the wheel h, thus preventing any movement of the hammer Z; but when the tension on the cord 0 is released, the spring a will be free to act to cause the hammer Z to vibrate and strike upon the bell O, thus sounding an alarm, and it will be readily understood that the opening of a door or window to which the cord 0 has been secured would release the tension of the cord and permit of the sounding of an alarm, and it will also be understood that if the cord 0 was parted by the action of the flame of a fire arising in the building or compartment that the alarm would be sounded. The idea of the loop (1 is to prevent the cord 0 from becoming entangled with the clock-work mechanism, which mechanism as a whole we will designate by the letter N, and the idea of providing a weight, D, is to draw in the cord 0 and cause a complete remission of the tension on the lever m. It will of course he understood that in certain places and under certain circumstances wire might be substituted for the cord 0.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

The combination, with a clock-work-alarm mechanism, of a lever, m, rigidly fixed to an escapement-lever, and a cord, 0, formed with a loop, q, which is passed through an eye, 12, and carries a weight, D, substantially as described.

LEANDER E. THOMAS. IRA \VOOD. \Vitnesses:

A. L. BUGBEE, M. D. GOEHLING.