US992542A - Thermostat. - Google Patents

Description

M. BRIGGS.

THERMOSTAT.

v APPLIOATIOH FILED 001222 1908. 992,542. Patented May 16, 1911.

WITNESSES lNVENTOR .To all whom may concern:

Unrran STATES PATENT OFFICE.

MELANCTHOIN J. BRIGGS, or PHILADELPHIA, PENNSYLVANIA.

THERMOSTAT;

Be it known that I, MELANGTHON J.

BRIGGS, a citizen of the United States, re-' siding in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Thermostat, of which the following is a specification.

.mnostat, particularly described in the *ficationtherefor, filed June 8th, 1908, Serial My invention is concerned with a new form of electrical thermostat, such as is employedin a fire alarm circuit to indicate a rise in temp ratureto or beyond certain predetermined egrees.

My invention is designed as an improvement upon my former invention of a therspeci- No. 437,463, and is to be used only in connection witlnand inclosed in, a hermeticallysealed tube or case, which tube or case, will constitute the expansible member of the thermostat, as described in the said specifi cation. g

The object of my invention is to so improve my said former invention, as to have the means of bbth closing and opening the electrical circuits, actuated directly by the expansible member,-.wit-hout the aidof a spring oraother device.

My invention is illustrated in the accom-' panying drawings in Which- Figure 1, represents the front elevatlon of g the interior-mechanism of a thermostat embodying my invention, the casing being shown in section and Fig. 2, represents a so inclosed may'liidt'be' corroded, impaired o section'on line 00-40 of Fig. 1;.

The same figures designate the same parts throughout the drawings.

For the purposeof illustrating my inven- -t ion,.'I have shown in said drawings, one form thereof, which is-at present preferred by 'me, since the same has been found in practice to give satisfactory and reliable re-- Specification of Letters Patent. Patented luay 16, 191 Application filed October 22, 1908.

, side (if should fit so loosely therein as to be readily- Serial No. 458,990.

or affected by gases, moisture or dust in the atmosphere surrounding the thermostat, while the expansiblememberis itself so exposed as to be immediately aifected by any changes in the temperature of such atmosphere; said expansible member 1, maybe of any metal or substance which readily ,expands with-heat and contracts with cold, but preferably of aincor brass, constructed inany suitable forms, but preferably in the form of a cylindrical tube, or an elongated rectangular afthin but rigid piece of w0od-,or orcelain,

or some other non-conducting material, but' slightly affected by chiinges of temperature,

extends nearly the entire length of the insaid expansible member 1, .and

moved longitudinally by thecadjusting screw.

' 1-. Said base 2, has a metal block- 6, rigidly atfixed to one end thereof, which block 6 is perforated by a threaded hole 5, fitting the adjusting screw 4, which passes through said hole 5, and holds that end of said base 2 firmly. in position. Adjacent to the otherend of said base 2, andrigidly afiixed there to, is a metal plate 10.

' The lever conductor 3, is pivotally attached to said metal plate 19, by its fulcrum pin 12, and the short arm of said lever conductor is pivotally attached to the metal block 9, by the pivot pin 11, the said block 9,

and it may be se, with the ends hermetically closed with the same material. An adjustable base 2, preferably made of beingv rigidly attached to the end piece 8,-

of the expansible member 2, and eatendin through the said end piece 8, to the binding post 21. The long arm of said lever ('10 ductor 3, extends down so as to engage the flexible spring contact 19, and to press the same against the contact 2 The adjusting screw 4, passes through a closely fitting round hole in the-center ofthe end piece .7, of the expansible member 1, and has a collar 18, so brazed or soldered on to said adjusting screw 4,as to preclude any longitudin al" movement thereof the threaded end. of said adjusting screw 1. passes through the threaded hole 5, in the block 6, aflixed to the said base 2,. holding the end of said adjusting screw 4,106 the right or le thebase 2, is moved longitudinally, whic forces the long arni -of' said lever conductor 3, toward or away fgrom as said contact 19.

said base 2, firmly in position, By turnirfi The flexible spring contact 19, is afiixedgto the base 2, by the metallic pin 13, which ex- Y tends through said base 2, and is attached tothe insulated wire said contact consists of a flexible spring which will yield to pressure of the long arm of the lever conductor "said base 2, by the metallic pin 14, which extends through said base 2, and is attached to the insulated wire 16, The contact 20, is so ,placed in reference to the'contact 19, that uit.

when the temperature increases a predetermined number of degrees. above that at which the said lever conductor 3, engages said contact 19, said contact 19, is forced by the continued pressure of said lever conductor 3, againstisaid contact 20, thus closingthe second circuit. The wire 17 is attached to thebinding post 21, extending thence to the positive pole of an electric battery.

The' ins'ulated wire 1 5, is attached to the metallic pin 13, and extends through the hermetically sealed hole 22, in'the end 8, of"

the expansible member 1, j and thence, through the armatures of desired s gnals, to the negative pole of said electric battery.

The insulated wire 16, is attached to the mei tallic pin 14, and extends through the saidhermetically sealed hole 22,. and thence, through the armatures of the distinctive signals of the second circuit, to the negative pole of said electric battery. Upon the. ex.- terior of the end 7, of said expansible memher 1, is placed a dial plate upon which is laid off a scale, so spaced'that the movement of the indicating arm attached to the head of the adjusting screw 4, one space on said scale, makes a change of 5 degrees in the temperature required 'to closethe first circuit.

The-operation of my device will, it is be- 2, being fixed, and the long arm of the lever conductor 3. is thrown to the right and against the l(3(!i1'1(2 ill contact 19, thus closing the first circuit.- Should the temperature continue to increase, the pressure of the long arm of said lever conductor 3, will force the flexible spring'19, toward the contact 20, and, when it reaches the degree at which contact 20 is set, said contact 19, will engage the'contact 20, thus closing the second cirthe short arm of the lever conductor 3,

A falling temperature will cause a 5 mnesia downward, and the long arm thereof to the left,'-and away from the contact 19'; both of secure by Letters Patent is-' 1. In a device of thechara'cter described, the combination with an expansible member, consisting of an hermetically closed tube or case, an adjustable base inclosed therein, a lever conductor pivotally attached to the said base, one arm of said lever conductor pivotally attached to said expansible memher, an electrical contact within said expansible member'rigidly affixed to said base in the path of the other arm of said-lever conductor, and external means for adjusting the thermostat by moving said base longitudi nally.

2. Inadevicc of the character described, the combination with an cxpansible member, consisting of an hermetically closed tube, an adjustable base inclosed therein, a

lever conductor having its fulcrum rigidly attached to said base, one arm of said lever conductor pivotally attached to the said ex-..

pansible member, a' flexible spring electrical contact within said expansible member attached to said base in the path of the other arm of said lcvcr conductor, a second electrical contact within said expansiblcunemher with which the said flexible spring contact will engage at apredeterniincd increase of temperature, whereby a second distinct signal may be given, and external means for adjusting the thermostat by moving said base longitudinally.

3. In a device of the character described, the combination with an expansible men:- bcr, consisting of an hermetically closed tube or case, an adjustable base inclosed therein, a. lever conductor pivoted upon a fulcrum rigidly attached tosaid base, a block rigidly -attached to said expansible member, one arm of said lever conduct-or 4. In a device of the character described,

the con'ibination with an expansible member, conslstmg of an hermetically closed tube or icase, an adjustable base inclosedtherein, a

lever conductor pivoted upon a fulcrum rigidly attached to said base, a block rigidly attached to said expansible member, one arm of said lever conductor pivotally attached to said block, an electrical contactwithin 1 said expansible member independent of said this specification in the presence of two witlever conductor and attached to said base nesses. in the path of the other arm of said lever conductor, and'an adjusting screw anchored I MELANCTHON' BRIGGS 5 in the end piece' of said expansible member, Witnesses:

by which said base is moved longitudinally. JNo. LEARY,

In testimony whereof, I hereby subscribe LEON A. CANTER.

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