US1039174A - Thermostat. - Google Patents

Description

E. MOSS.

THERMOSTAT,

APPLICATION FILED JUNE 24, 1909.

1 ,039, 1 74;, Patented Sept. 24, 1912.

SNVENTOR, ERNEST Moss,

57 JWOMDMA UNITED STATES PATENT OFFICE.-

ERNEST moss, or DALLINGTON; cnnrsronnncn, NEW znanm.

mmos'lwr:

To (123 whom. it may concern: I

'Be it known that I, ERNEST. Moss, a sub-- ject'of the King of Great Britain, residing at Dallington, Christchurch, in the Dominionof New Zealand, have invented a new and useful Thermostat; and I do hereby declare the=followingto be a full, clear, and! exact description: :of the 1 same.

This invention. relates toan improved construction of apparatus forrthe purpose of recording beat, her for giving an. alarm upon. an outbreak of fire in its vicinity,-

The invention relates particularly 'to that class ofrappliances in which a fluid, ex-- pansible under the action of heat, is placed within a receptacle having flexible :sides and connected with electric alarm circuit making-or breaking apparatus, in order to sound an alarm when thesidesof-the-reoeptacle expand under the action-of the=expending fluid."

The invention consists: inan improvedconstruction of such'apparatus," by means of-which provision is made for thesounding of a local alarm, as the temperature begins to rise, and for the sounding of-a second alarm, say situated at a fire station, when the temperature reaches a dangerous degree.

The invention also consists in other details ofconstruction and arrangement of parts whereby a compact reliable apparatus is provided.

Infully describing the invention, refer ones will be made to the accompanying sheet of drawings, in which,-

Figure 1 1s a front elevation of the appliance, electric circuits connected therewith being indicated by the diagrammatic Fig. 2 is a sectional side elevation lines. thereof, taken on the line 22 of Fig. 1. Fig. 3 is a back view of the cover of the appliance showing the operative parts attached thereto.

The appliance devised consists of a metailic case or box A that is adapted to be fastened to a Wall, ceiling, or other fixture,

and is provided with a metallic cover B 'springy-nature, and are insulated from the Patented Sept. 24, 1912.

' pension or-contraction of 'the fluid willf."

thereby cause theinner wall D to bulge in ward into the casing or-outward therefrom; Fixed to the center of the flexible wall D is a stud or pin Eformed with an overhanging inner end. I Y I Secured to the inside of thecover are themetal arms Fund G which are made of cover and box, by being vattached' .to-the insulating blocks F and G respectively." Thesearms are arranged to extend downwardxsothat their bottom: ends will lie within the range ofmovement of the stud E, and one -a'rm' F is placed so as to lie in front of such stud, and to be keptin'close contact therewith, while the other arm G is arranged to lie behind the stud away from contact therewith as clearly shown in Fig. 2. The relative positions of these-twoarms I inrelation to the stud are regulated "-by means of the screws Hand J respectively. These'screws pass in' through the box cover B (being suitably insulated therefrom) and o by manipulating them, the distance of the arms from--the stud may be arranged-at y. will, and the amount of expansion andcoritraction'movement of the wall D necessary to make and break contact betweenthe g5 arms and the stud consequently re lated.

The arm F is preferably arrange *to'opcrate the local alarm and it is arranged to complete a closed circuit K with the box A and adapted,'when broken, to'operate an alarm relay M. The arm-Gris arranged-to actuate the main'alarm, and it is placed in open circuit N with such alarm and the box, through earth, as shown :inwFig. 1,1 or through a metallic circuit. This arrangement of the arms F and G I prefer, because -I consider it best to hold the local circuit closed, since the first alarm is to be given here, and unless the contacts were maintained carefully an alarm would call attention to the fact that there was trouble. The least expansion of the plate D would cause the contact E to leave the arm F and give the alarm. If an open contact were relied upon to give the first alarm, rusty or imperfect contact might allow the fire to get under way, without giving an alarm. Moreover, if the battery were out of order, the open circuit would not work, whereas, with the closed circuit, a run downvbattery would be at once indicated. There is a further advantage in the fact that the movearm G thereby closing cuit N and causing such ment of the plate D in the same direction operates both alarms. If the fire is only a moderate one the second alarm need not be allowed to operate, but there will be no fail ure of the alarm, because some one forgets to turn it in. The increase in the heat takes care of the second alarm, ants are I giving their attention to extlnguishi-np the blaze.

It wi 1 be seen that when the appliance is subjected to a rising temperature, the fluid within the receptacle C will expand, and as it expands, will force the wall D and stud E inward into the box. The stud E- will then leave the arm F, breaking its circuit and closing the alarm relay M, and thereby causing such alarm to sound. As the heat increases and the inward movement of the stud E continues, such stud will engage with the the main alarm ciralarm to sound, and to continue sounding so long as the heat remains at the same or a higher temperature. Should the temperature then fall again, the different parts will resume their normal positlons again. I

It will be readily understood that by means of the screws H and J, the positions of the arms F and G may be arranged so that the different alarms may be caused to sound at anydesired temperature. These screws for this purpose may be provided with any approved form of indicating mechanism by which their positions are thus regulated, say for instance, pointer arms H, J attached to their outer ends, and passing over scales as, m upon dials fixed to the cover. It will also be apparent that the alarm circuits operated by the movements of the stud It may be both closed or open circuits without departing from the spirit of the invcntion, and merely requiring variations in the arrangement of the arms formation of the stud.

O and l? are the terminals by means oi F- and Gr and the while the attendwhich the respective circuits K and N are connected to the arms F and GT respectively. These terminals are suitably insulated from the box A.

R is the earth terminal by means of which the box is arranged as part of the respective circuits K and h.

Any number of these appliances may be connected to the same alarm circuits, suitable indicator boards I being arranged in the well known manner to differentiate between alarms actuated by the distinct appliances. Thus, the locality of a fire or of a rise in temperature may be indicated at the same time as an alarm is given.

What- I do claim as my invention, sure to secure by Letters Patent, is,

In a thermostat, the combination of a metallic casing; a front cover fitting thereon and having a recess in the lower part of its inner face; a flexible inner wall secured over said recess and forming therewith a receptacle; an expensive fluid in said receptacle; a stud secured to said flexible vwall and having an angular end portion spaced from said wall; separate insulating blocks secured at the upper corners respectively of the inner face of said cover; spaced approximately parallel pending arms secured to said blocks respectively and each having an inclined lower end disposed respectively to "the front and the rear of: said angular end of the'stud; regulating screws passing through said cover and engaging said arms respectively; pointer arms on said screws respectively; and a scale under each pointer and on the front of the cover.

In testimony whereof, l have signed this specification in the presence of two subscribing witnesses.

and denaunsr Moss.

Witnesses:

C. H.,S'ro1-i an,' Cues. G. Maseru.

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