US1062137A - Electric fire-alarm. - Google Patents

Description

' H. BARDITZKY.

' ELECTRIC FIRE ALARM.

APPLIQATION FILED MAY 11, 1912.

' Patented May 20, 1913.

INVENTOR Altomey cOLLmQlA PLANOGRAPH c0., WASHINGTON, 5.1:

HERMAN BARDITZKY, F MEMPHIS, TENNESSEE.

ELECTRIC FIRE-ALARM.

,T0 (ZZZ whom it may concern Be it known that I, HERMAN BARDITZKY, a citizen of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, have invented certain new and useful Improvements in Electric Fire Alarms, of which the following is a specification. 7

This invention relates to fire alarms and particularly to electric fire alarms, the ol ject being to provide an alarm of this de scription which will be economical to manufacture, simple in structure, not liable to breakage or disarrangemcnt, and adjustable readily and easily whereby it will operate at any desired degree of heat.

Vith these objects in view, the invention consists in'tlie improved construction, arrangement and combination of parts hereinafter fully described and afterward specifically claimed.

In order. that the construction and opera tion ofmy invention may be readily understood, I will now proceed to fully describe a preferred embodiment illustrated in the accompanying drawings, in which- Figure 1 represents a view ofmy inven-' tion 1n elevation, the circult, battery and' bell being shown diagrammatically. Fig. 2 represents a view of the same with the contact mechanism in longitudinal vertical sec-- tion. in elevation, and Fig. 41 represents a similar view of the opposite end.

Like reference characters mark the same parts wherever they occur in the several figures of the drawings.

Referring specifically to the drawings, 10

indicates a base made .of' metal which is of very slight expansibilit-y under the influence of heat, upon which is erected near one end a block, wall or standard 11 of a nonelectric conducting ,material, having a central threaded opening, as at 12, and at the other end a similar wall, standard or block 13 having a smooth central opening 14 in line with the threaded opening '12 Intermediate the standards 11 and 13, is a guide block 15, also of non-conducting material having a smooth central opening 16 in line with the openings 12 and 1 1. Slidably fitted in the guide block 15 is a rod 17 of a metal highly expansive under the influence of heat,

the end of said rod being threaded as at 18 to engage in the threaded opening 12 in the standard 11. On the threaded portion of Specification of Letters Patent. i

Application filed May 11,. 1912.

Fig. 3 represents a view of one end,

Patented May 20,1913.

Serial No. 696,664.

the rod 17 is secured a dial 19'graduated andv numbered to indicate degrees, and having notches 20 in its periphery to receive a pawl 21 secured to the standard 11. On the outside of the standard 13 isv a plate 22 of a conductive metal secured over the opening 1% by-any suitable means, such, for instance, as screws 23. A rod 22 of conductive material is fitted in a central opening in the upright 13, in line with the rod 17 and one end being twisted around the threaded end of the rod 17 and the other around the rod 22 of the plate 22, said circuit including a source of electric current, as a battery 25 and an alarm, as a bell 26. The ends of the wire are secured by the nuts 17 and 22", the first nut clamping one end of the wire against the dial 19 and the second nut clamping the other end against. the plate 22.

By turning the rod 17, its threaded end is moved longitudinally in the threaded 'opening 12 andits opposite end projecting beyond the guide block 15 brought nearer to orfarther fromthe rod 22*, and the dial 19 being also turned, the degree of heat at i which the alarm will be sounded, will be indicated onthe dial by the pawl 21 which, engaging in .the notches 20, will also hold the dial against turning,and thus preserve the adjusted position of the rod 17. Normally the end of the rod 17 will be outof contact with the rod 22 and the circuit will be broken, but as soon as the temperature rises to a suflicient degree, the rod 17 will be expanded, and its end will contact with the rod 22 and close the circuit through the plate 22, the wire 24, alarm 26, the battery 25 and the rod 17, thus sounding the alarm. The rod 22 being yieldingly held by the spring, no injury can result from over-expansion of the rod 17 due to excessive heat.

From the foregoing, the construction and operation of the invention will be readily understood, and it will be observed that the standards composed of materials which are non conductors of electricity, a rod secured in one standard and terminating near the second standard which standard is provided with an opening in line with the rod, a nonconducting guide block in which said rod is slidable, a contact plate secured on the outside of the second standard having an open ing in line with the opening of said standard, a second rod of conducting material slidably mounted in the opening of the second standard, having a headed inner end, and a threaded outer end projecting through the opening in the contact plate, an expanding spring in the opening of the second standard around the second rod therein, between its headed inner end and the contact plate, and an electric circuit containing a battery and alarm and having its terminals in the ends of the two rods.

2. A fire alarm comprising a base of material but slightly expansible under the influence of heat, a standard of material which is a non-conductor of electricity erected at one end of the base and having a central threaded opening, a second standard 01": non-conducting material erected at the opposite end of the base and provided with a smooth central opening, a rod of conducting material more expansive than the base under influence of heat having one end threaded and engaged in the threaded opening of the first standard and the other end smooth and terminating near the second standard, a contact plate on the outside of the second standard having an opening in line with the highly expansive rod, a contact rod slidably fitted in the opening of the second standard and the contact plate and having a threaded end, a nut on said threaded end outside of the contact plate, a graduated dial secured on the threaded end of the highly expansive rod and having notches in its periphery, a pawl secured to the first standard and engaging said notches, and an electric circuit containing a battery and alarm and having its terminals in the threaded ends of the two rods.

In testimony whereof I atlix my signature in presence of two witnesses.

HERMAN *KARDITZKY. Witnesses J. A. Bownns, A. Tosrr, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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