US498153A

US498153A - Thermal circuit-closer and indicator

Info

Publication number: US498153A
Authority: US
Publication date: 1893-05-23
Anticipated expiration: 1910-05-23

Description

(No Model.)

J. L. BRADLEY.

THERMAL CIRCUIT CLOSER AND INDICATOR.

No'. 498,153. Patented May 23, 1893.

UNITED STATES PATENT OFFICE.

JAY L. BRADLEY, OF ST. LOUIS, MISSOURI.

THERMAL CIRCUIT-CLOSER AND INDICATOR.

SPECIFICATION forming part of Letters Patent No. 498,153, dated May 23, 1893.

Application filed December 5, 1892. Serial No. 454.081. (No model.)

To aZZ whom it may concern.-

Be it known that I, JAYL.BRADLEY,of the city of St. Louis,in the State of Missouri,have invented a certain new and useful Improvement in Electric Indicators, of which the following is a description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to an improved indicator which will signal the exactfioor of a building where fire exists.

My invention consists in features of novelty hereinafter fully described and pointed out in the claims.

Figure I is an elevation illustrative of my invention, and showing the movable plug or object in its normal upper position. Fig. III is a similar view, showing the plug or movable object in its lower position. Fig. II is a vertical section taken on line IIII Fig. I. Fig. IV is a transverse section taken on line IV'IV Fig. II.

Referring to the drawings, A represents a guide or support of some non-conducting material, and having a base B by which it is secured in place. The part A is preferably made in the form of a cylinder with slots 0 and D in its sides.

3 represents a gravitating block or object movable by gravity when released, and located within the support A and guided therein by its sides fitting in the slots 0. This block or object 3 is provided at its lower end with a fusible plug 4 and at its upper end with a stop or cross piece 5. Between the plug and the stop, the block is provided with a number of contact points 2. The end of the plug,

stop, and contact points fit and move in the slots D of the support A.

1 represents contact points secured to or fitting in the support A and to which the electric wires are connected. Upon these points 1 the fusible plug 4 rests, as shown in Figs. I

and II, and by this means the block 3 is held in its upper position in the support A, the electric circuit being closed as long as the plug 4 rests on the points 1.

The operation is as follows: Should the temperature in a room rise above a certain point the plugs 41: will fuse, and the block 3 will drop until the stop 5 comes against the points 1, again closing the circuit. As the block 3 falls the points 2 engage the points 1 and slip past through them, the circuit being closed each time, and by providing the proper number of these points 2 to correspond with the number of the floor upon which the indicator is placed, the signal given will indicate upon what floor of the building the tire is located.

I claim as my invention- 1. In an electric indicator, the combination of contact points 1, a movable object 3 having contact points 2, and fusible plugs 4, substantially as and for the purpose set forth.

2. In an electric indicator, the combination of contact points 1, a movable object 3 having contact points 2, and a fusible plug 4:, and stop 5, substantially as and for the purpose set forth.

3. In an electric indicator, the combination of the support A having slots 0 and D, movable object3 fittingin said support and guided by said slots 0 and provided with a fusible plug 4., contact points 2, and a stop 5, all fitting and moving in said slots D, and contacts 1 fitting in said support, and upon which said fusible plug 4 and stop 5 are adapted to rest, and against which said contact points 2 are adapted to engage, substantially as and for 80 the purpose set forth.

JAY L. BRADLEY.

In presence of- ALBERT M. EBERSOLE,

ED. S. KNIGHT.