US925575A - Automatic fire-alarm. - Google Patents

Description

E. FRLANI.

AUTOMATIG Fm: ALARM. APPLICATION FILED DEU. 30, 190B.

925,575.. Patented 11111922, 1909.

Umm-D TES. 'PfATENEA I @FFW HERMANN restaurer PiRANo,`.iUsjrRia-Hnuoaar.

. Au'roMA'rrc FlurLilli..amr..`

Specification of LettersPatent- Patented ne. `2li-s11909i Appiicatioamee necembeiso, '1908.y seriwn.469,est. f i

To all whom t may' concern:

Be it known that I, HERMANN FUR'nANna subject of the Emperor of Austria-Hungary, and residing at Pirano, in the Coast Provi ince of austria-Hungary, have invented cer- 'tain new and useful improvements in Auto-l matic Firedhlarms, of which the following is a specification.

This invention relates to an electric fire alarm, set in operation by the fusing of an.

insulated mass disposed between conductive members, .the particular object of the invention being to provide a device of this char-- acter comprising a structure adapted to be inverted and so arranged that when the structure is maintained, in -one position, the melting of af mass fusible at a comparatively lowv temperature will set the alarm in operation, and when maintained in a reverse p0- sitionhthemeltingof a mass at a considerably higher temperaturewill set the alarm in' operation, whereby .in one and the same structure. means are provided for protecting goods inflammable at varying temperatures.

Further objects and advantages 'of the in^ vention will be set fort-h in the detailed description which now follows. l

Referring to the drawing, Figure l is a front elevation of a. device coizzructed in accordance with the invention, Fig.v 2 is a vertical section thereof, Fig. 3 is a vertical sect-ion after one of the fusible masses has been melted, Fig. 4 is a. horizontal section,

and, Fig is a' vertical section of a modified formy o' the device. Like numerals designate corresponding parts in all of the ligures of the drawing.

Referring to the drawing, the numeral .i-

. designates an insulating back plate adapted to be inverted at will andr to be hung uponl the wall of a room in either position. This baalt plate is .piercedat i2l and 13 to facili tate hanging it in either position desired. A. metallic -tube '2 is connected to a binding plate 3, theiback plate also supporting a binding plate 4. The ends of the tube2 are l.plugged by insulating plugs 5 and 6 through which ends 1.0 and 1l of an electrical conductor 50 pass. This electrical conductoris connected to the binding plate 4 by branch conductor 50 (see Fig. 4,). vThe tube. is

divided into two pai-'ts by acentral wall, one compartment ofthe tube containing` an insulating mass S fusible at about 7 50 F. and

. l0 and the tube 2, it is apparent that Atric circuit will be completed between the other compartment ncontaining fan'i'linlsu-l lating mass 7, fusible approximately at,120 F. On each s-ide ofthe partition orwall is provided a drop of mercury 9, the insulating masses 7 and 8 maintaining these drops of mercury out.4 of contact with the points l@ f and 1'] of conductor 50.

In the form of the device shown in Fig. 5, the parts are all toe same and have been' given the same reference numerals except thatv the ends l0 and 11 of the conductors are brou'ghtto a point adjacent' the central partition plate of tube 2 and the insulating masses Zand 8 maintain the dro'ps of-mercury adjacent the plugs 5 and 6. It. will be apparent tl^ erefore, that when the lowermost drop of mercury shown in Fig. 2 is.permit ted to descend, by the melting of the mass 8, until it reaches the end of the conductor 1l,

an electric circuit will be completed,- for one l of the wires, not s hown of an electric circuit is to be attached to the binding plate, 3 and."

the other wire thereof is to'be attached to the binding plate 4. The'circuit will therefore be completed through binding plate 3, tube 2, Ilowermost mercury drop -9'and conductor -5() tobinding plate 4. Of course just exactly theV same thin@ happens at the other end of theI tube when the tube, is inverted, the only diiference being that' it requires a' diiferent degree of heat to bring about 'the completion of. the circuit.

In'Fig. 5, the two terminals of the electric? circuit are indicated at and 4 and ti wires 10 and 1l area part of the conductor 50 connected directly to the terminal 4. Terminal 3, upon the other hand is directly connected to. tube 2. Therefore, when the uppermost drop of mercury in this iigure desee establishes coninuinication between terminals 3 and 4.

From the foregoing description it Ywill be seen that simple and eiicient means are herein 'provided for acconiplishing the obn ects 'of the invention, but while theelements shown 'and described are well adapted to serve thepurposes for which they are intended, it is to be understood that the invention is not limited to the precise construction set forth, but includes within its Vpurview such changes as may be made within the scope of the appended claim.

Having described my invention, what claim 1s:

An automatic fire alarm cemprlslng a conductive tube, electric terminals projecting 5 into each end thereof and insulatecltherefrom, and movable conductive material normally maintained out of Contact With said electric terminals by separated fusible masses disposed at opposite ends of said tube and

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