US1115607A - Thermostatic circuit-controller. - Google Patents

Description

G.E.SPBAR. THBRMOSTATIG CIRGUXT CONTROLLER. APPLICATION FILED APR.11, 1913.

1,115,607. Patented 1ma;11g/1:21'.4 17259.11;

representing like parts.-

' 2o constant temperature.

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GEORGE E. srEAn, or 'Aivinsnunin MASSACHUSETTS, AssreNonTo sTaNnAryn 'reen MoMETEn COMPANY, or BOSTON, MASSACHUSETTS, A ConronATioN or MAINE.

TTHERMOSTATIC CIRCUIT-CGNTROLLER.

Patented Nov. 3, 1914,

T'o all whom it maylconcemt Be it known that I, GEORGE E. SPEAn, 'a l citizen of the United States, residing in Amesbury, county of Essex, and State of 5 Massachusetts, have invented an Improvement in Thermostatic Circuit-Controllers, of which 'the following description, in connection with theaccompanyingdrawings, is`

a specificatiomlike `letters on the drawings This inventionelates to a thermostatic j circuit controller, especially adapted for and closing of the controlling the opcnin p hot water. heaters,

dampers of 4steam an 15 furnaces andthe like', and has for its object to provides simple, conipact, .eiiicient and inexpensiveapparatus with which the temperature of-a ouse or other building may be regulated and maintained at a substantially The particular features of the invention vFigure 1l is a front elevation of an instrul this y invention. like viewlwit t ecovcr andglass removed. Fig;` 3, an enlirged. vepticalsectionon the 'line 3 3, Fig. (1. Fig. 4, erection-ion `the line fil-4, Fi 3, Alooking in the direction of ig 51, a' rear elevation .of the instrument, andl Fig. 6, a diagram of circuits to illustrate the Workingof the instrument.

The' instrument hereinshown as embodyin -this invention 'is provided with a circu ar casing a having a covei'fbf4 rovided with a slotc behind which i iocate a glass disk d. The casing e conta As e, mtal disk e suitably secured in fixed osition within it and'provided with a curve slot f and above the latter with a' scale or series of graduations g indicative of degrees ofitemperatlire..

In the present instance, the dish:A e is' positioned within the casing by Vstuds It secured to the rear wall of the casing and a ring i,

which bears against the 'front face of the disk.V The ring j is retainedwithin the casingby the glass disk (Z and cover. b. The metal disk c di'ides the casing into two chambers m, n, and has secured to its real" side a plate 12 and ayoke 13, which support a shaft 14, which is designed to be turnedin opposite directions by a coiled thermostatic strip 16 whose eonvolutions are concentric, and which has one end attached to the shaft 14;v and its other end to a stud 17 Fig. 2, a.

onthefplate 12, The shaft 14 is extended through a1 holein the disk e into the chamber fm, and has attached to its front end a contact erin or member 20, whose upperk end'. 1sV extended between two circuit terminals Shown asset screws 21, 22, which are adjustably carriedzby studs 23,24 on the cross bar its lower end a disk 30 provided with a plurality of gear teeth 31, which mesh with a p inion 32 on a shaft 33, supported by the disk ev and by a cross bar 34 secured thereto as by screws 35. The disk 30 is mounted to turn on a hub 37 attached to the plate 12 and projected through a hole in the disk e, and lis retained on t e hub by a washer 38. The shaft 33 is turned by a handle 40, which is preferably detachable from the said shaft,`

and to this end is provided with a hollow. stern or shank 41, which is adaptedto be inserted through a hole in the cover band fitted over the end of the shaft 33, which latter is provided with a longitudinally eirtended slot d2, into which passes a cross pin 43 within the hollow Shank or stem 41, and by means of which the handle is engaged with the shaftso as to rotate the saine when the handle vis turned. The studs 23, 2e which carry the terminal screws 2l, 22 are insulated :from the cross bar 25 by strips 43 sulatedy flexible `conductors 44:, 45 to fixed terminals 46, 47 extended through the back wall of the casing and having connected vof of micaor other-Suitable insulating material.4

The studs 23, 24 are connected by in- 90 therewith eontinuations of thewires 44, 45,

which form part of two circuits containing tact with the terminai screws 21, 22.

Tlievcontaot arm 20 is common rto both..v

circuits, which are diagrammatically shown' is connected b the Wire 54, and with the other .of wliie are connected by the wires 4i, 45.

eleotromagnets .50, 5l are provided with the electromagnets 50, 51...vv The wire 54is electrically connected with the ,Contact arm 20, through the metal frame .or

ica

I two electromagnets 50, 51, which are enerlgired when the contact arm 20 makes conin Fig.- 6, und comprises line wires 52, 53, with one of which as .52 the contact arm 20,

suitable armatures 57, 58, which are operatively connected in a manner well understood, with ,the mechanism (not shown) -which operates the damper Vor other devices to be controlled. l

` The glass disk d Ais broken away as at 60, Fig. 3, so as not to interfere with the handle 40 In operation with thelinstrument herein shown, the handle 40 is turned so as to move the pointer 27 to the graduation g on the dial,- which-is indicative ofthe temperature at which it ,is desired the house or other' building or a 'room therein should be heated.

The screws 2l, 22 are adjusted 'at the factory with relation to the contact arm 20,`

so that the temperature may vary' one or more de rees on either side of the degree with which the pointer registers. When the temperature inv the vicinity of the instrunient rises above that at which the pointer rests, a sufiicient amount, say one or two de grecs, the contact arm 20 is brought into contact with the screw 21 and the circuit of .the magnet-44; is closed, therebyk eneru gizing vthe said magnet and operating the mechanism (not shown) to close the damper.

When the temperature of the room-falls below the desired temperature, say one or two vaoy degrees, the contact arm 2O is brought into Icontact with the. screw 22 and the circuit of the magnet 45 lis closed, which energizes the same and eil'ects the opening of the damper. It will be observed that the pointer 27,

l Tshaped bar 26 and toothed disk or gear 30 may be and preferably are made in one piece of metal, and may be stamped out o f av piece of sheet metal, which vserves to s1mi plify and reduce the cost of the instrument.

So also it will be observed` that the convolutions of the-thermostatic strip are concentric, which enables the thermostat to be brought into close proximity to the disk e vand thereby enables the instrument to be contained in a vshallow* casing, which serves to make theinstrument compact and also to reduce the cost.

By making the handle detachablefrom shaft' 33', li ability of the pointer being turned byfunauthorized per'sonsisA reduced to a zI nininfiu'rn.

'Claim'sz i y l. In an instrument of the class described, in combination, a casing, provided with a .removable cover having an opening in it,

to said plate, a shaft supported by said cross bar `and plate and Vextended through said disk, ,a 'thermostatic strip having 'a plu' rality of concentric convolutions located between said plate and cross bar and having one end secured to said shaft, 'a contact arm mounted' on said shaft in front of said disk, circuit terminals between which said contact arm is extended, a T-shaped carrier for said terminals having the latter secured to ,the cross bar of said carrier, a pointer integral with the said carrier and coperating'with said graduations, and a toothed disk integral with said carrier, a pinion in mesh with saidl toothed disk, a shaft on which said pinion is mounted, anda handle on said shaft to turn it, substantially as described. l 4, 2. In an instrument of the class described, in combination, circuit terminals spaced apart, a T-shaped carrier for said terminals having the latter secured to the cross bar of ,said carrier, a pointer extended from said cross bar and integral therewith, a toothed disk integral with the vertical member of se f said carrier, means to rotate' said toothed disk, a, hub on which said disk is mounted, a shaft extendedthrough said hub, a contact arm attached to one end of said shaft and having its free end extended' between said circuit terminals, and a thermostat conf nected with said shaft to yrotate the same and move said-contact arm, substantiallyas described.

" In testimony whereof, I havesigned my name to this specification in the presence of two subscribing witnesses. ,l

GEORGE E. SPEAR. Vitnessesz E. M. Renn, 'FRED D. HAG'AR.'

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