US1805946A - Automatic fire alarm - Google Patents

Description

May 19, 1931. J. E. eooowm AUTOMATIC FIRE ALARM Filed Jan. 51, 1929 2 Sheets-Sheet l hams lLLia Patented May 19, 1931 UNITED. S ATES JAMES GOODWIN, OF CEDAR BLUFF, VIRGINIA auroua'nc FIRE ALARM Application filed January 31, 1929. Serial No. 336,616.

This invention aims to provide a novel temperature-controlled switch mechanism whereby upon a rise of temperature, one

. circuit may be opened and another circuit be closed, the structure being of peculiar utility in connection with fire alarm systems and the like. 7

It is within the province of the disclosure to improve generallyv and to enhance the "utility of devices of that type to which the invention ap rtains.

With the a ove and other objects in view, which will appear as the description proceeds, the invention resides in the comblna- 16 tion and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in side elevation, a device constructed in accordance with the invention;

"Figure 2 is a longitudinal section wherein some parts appear in elevation;

Figure 3 is a horizontal section on the line 3-3 of Figure 2;

Figure 4 is a bottom plan;

Figure 5 is an end elevation;

vFigure 6 is a cross section L on the line 6-6 of Figure 2;

, Figure 7 is a longitudinal section similar to Figure 2, but showing the parts .as they will appear after the fuse has been melted out. V

The device formingthe subject matter of this application comprises what may be designated under the general name of a frame, marked, as a whole, b the numeral 1.- The frame 1 is made 0 porcelain or other insulating material, and includes a plate-like base 2, and a hollow body 3 del pending from the base 2, the base 2 being supplied in its lower surface with a depression 4 wherein the body 3 is received;

The body 3 is rovided with a longitudinal chamber 5 wl iich, as shown in Figure 3 and inFigure 6, is somewhat restricted in width. The chamber 5 is provided atone end with an enlarged circular extension 6 (Figure 3) which opens downwardly through the lower surface of the body 3 (Figure 2). The chamber 5 is provided at its opposite end with an enlarged circular extension 8 (Figure 3) which is not quite so large in diameter as the extension 6. It will be seen from Figure 2 that the extension 8 is not prolonged through the lower surface of the body 3. The body is equipped with transverse recesses 10 located on opposite sides of the chamber 5. Referring to Figure 7, for instance, it can be plainly seen that the recesses 10 are not so ,v

eep as the chamber 5. By means of securing elements 11, mounted in holes 12, the body 3 is held on the base 2 detachably, and the securing elements ma be bolts.

n angle bracket 14 is provided and is supplied in its depending armwith an opening 15. .A securing element 16a connects the bracket'14 with the body 3, at one end of, the body. Comparing Figures 1 and 5, the reader will note that there is a binding member 16 on the exposed portion of the bracket 14, and this binding member holds the conductor 17, the conductor 17 being extended through a hole 18 in the frame 1.

At that end of the body 3 which is remote from the angle bracket 14, there is another angle bracket which is marked by the numeral 19. A securing; member 20, such as a screw, holds the angle bracket 19 on the body 3. The angle bracket 19 carries a con necting screw 21 that retains the conductor 22, the conductor being extended through a hole 23 in the support 1, Figure 4 being referred to at this point. An angular arm 24, having some resiliency, is connected by a securing element 25 to the bracket 19, as shown in Figure 2, and the arm may be considered to be a part of the bracket. The

'arni 24 terminatesin a reduced finger 26 (Figure 4). At 29 there is shown a link which is made of metal, like the arm 24 and the angle bracket 19. 'The link 29 is supplied at its inner end with a projection 32 whichgives a good anchorage (Figure 2) 2 V V I 1,805,946

for a mass of fusible material'27 joining the reduced end 28 of the link 29 to the finger 26 of the arm 24 on the bracket 19, the parts 28 and 26 being overlapped on each other.

The outer end of the link 29 is fashioned into a hook including a bend 30 and a support'31 projecting backwardly through the opening 15 in theangle bracket 14. The part 31 of the link 29 is called a support because it up-holds a weight 33 that is ver tically slidable in the extension 6 of the chamber 5 in the body 3, Figures 2 and 7 being compared. The weight 33 is equipped at its lower end with an outstanding rim 34 which, cooperating with the lower surface of the body 3, limits the upward movement of the weight 33if the weight 33 is shoyed upwardly too far whilst the body 3, is detached from the base 2. The weight 33 is of frusto-conical form and has a slot ,35 in its upper end. A pivot element 36 is mounted inthe upper'end .of the weight 33 and extends across the slot 35. The vpivotelernent 36 forms a connection between the weight 3.3 and a rigid lever 37 which is movable in the longitudinal chamber 5 of the body 3. In that end vofthe lever 37 which is remote from the pivot element 36, there is an opening 38 through which extends a fulcrum pin ,39.- The opening preferably is a good deal larger in diameter than the pin 39so that the lever can have a somewhat loose fulcrum on the pin, a free and easy movement of the lever thus being assured. I The ends of the fulcrum .pin .39 are received in the seats .9, as shown in Fig ure 3, the construction being such that the fulcrum pin and the lever can'be easily removed when the body 3 is detachedfrom the base 2. a y Y r J A pair of metal contact members 40 are located in the transverse recesses 10 and have downwardly extended, converging, resilient tongues 41 that project (Figure 16,) into the longitudinal chamber 5 and extend beneath the switch lever 37. On top of the contact members 40 are placed metal washer blocks 42. Securing devices 43 (Figure .6) pass through theblocks 12, the contact members 40, and through the body 3. At theirlower ends, the securing devices 43ers threaded into anchor plates 44- (Figure Sande.) seat ed in recesses on the lower surface .of the body 3. The anchor plates 44' carry binding screws 45 holding conductorsAG which are extended upwardly through holes .47 in the frame 1.

When the fusible material 27 is in place, as shown inFigure 2, there is provided a closed circuit including the conductor lZ, the angle bracket 14, the link 29, the fusible material 27, the arm 24;,the bracket 19, and,

the conductor 22. Although the weight 3.3 rests on the finger 31 .of the link32, as

sh wn n Figure th s cl sed circuitis not circuit, because, with the parts arranged as show-11in Figures 6 and 2, the lever 37 does not touch the tongues 41.

When the fusible material 27 melts, the link 29 swings down int t e posit on F u the Pa ts 28 and are separated and he suppo t hereiribefore de cr bed .a

closed circuit, is opened.

When the parts assume the positions of Figure 7, the support 31 no longer carries the weight 33 and the weight 33 inoves ow wa hyg avi y,. 3

. When th w g m v d wnward, as

aforesaid, thelever 3T swings on. the fu l crum pin 39 and engages thetong ies ill of Figure 6. The circuit heneinbefore -de-' scribedas an opencircuit, now is closed 7 n ord t e tor the pa t th position .ofFigure 7 to. the originalposition of Fig 2, it is neces a y m e y o wing Alp the l k '29 and fast nit o t P t 2 101 the arm 24 by meansof the fusible material s own a .27 T .sunpert 3 raises th Wei-ght.33 and ilts-the" lever 37 o its fall,- crum 39"until the lever is in the positionof Figure 6 and ou of n abt Wi hth to gfl 31.

'Wh is laim d i8 7 I r 1. In a thermal switch, the combinationof a frame, a leve ul l r n d n t rame :i r vertical downward swinging ncrement, 3i thread ng weight moun e o the lease a constituting meaiis for swinging the lever downwardly, a contact rnember on the frame and out of electrical engagement with the lever when the lever is raisedythe lever ,enengaging the contact member -when the lever swings downwardly, responsive $0 the we ght a in emb dying a u e rpent im the weight resting directly on a partef ,the link, to support the weight, hold the lever ra s and ke p th lever-pu o electri l e gage n th thee o a t e b r, and mea ferment g h n o he frame at spaced points nopr e s s of the weight,

both of said means being spaced from the lever and being independent thereof,

In a thermal sw t he combination of a frame, .a .contact .n emb er .on the frame, le s umed 1 the f ame; a eight carried by the lever, ,a bracketon the frame, a link having ,a hook engaged pimtally th qugh th hra k t, h enrl 0 the/bookcagaging the weight to raise the weight and hold the lever out of engagement with the contact member, and fusible means cooperating with the opposite end of the link to hold it in weight-engaging position.

3. In a thermal switch, a body provided in its upper surface with a chamber, there being oppositely disposed seats in the body, the seats being in communication with the chamber, and openin through the upper surface of the body, t e seats being at one end of the chamber and the body being provided with an o ning disposed at the opposite end of the c amber, the opening extending through the lower surface of the body,

a base secured to the top of the body, a fulcrum pin having its ends mounted in the seats and retained therein by the base, a weight slidable in the opening, a lever pivoted to the weight, the lever being fulcrumed on the pin and being mounted in the chamber, a contact member on the body and wherewith the lever engages when the weight descends, and mechanism for holding the weight elevated, said mechanism comprising a fusible member.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature.

JAMES E. GOODWIN.

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