US655317A - Electric temperature-indicator. - Google Patents

Description

(No Model.)

Patented Aug. 7 I900. L. S. WILDER.

ELECTRIC TEMPERATURE INDICATOR.

(Application filed. Nov. 18, 1899.)

wilmaoaaa LESLIE S. \VILDER, OF SPRINGFIELD, MASSACHUSETTS.

ELECTRIC TEMPERATURE-INDICATOR.

SJPECIFICATION forming part of Letters Patent No. 655,317, dated August 7, 1900; Application filed November 18,1899. SerialNo. 737,435. (No model.)

To aZZ whom it may concern.-

Be it known that I, LEsLIE S. WILDER, a citizen of the United States of America, and a resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Electric Temperattire-Indicators, of which the following is a full, clear, and exact description.

This invention relates to improvements in electric temperature-indicators of the class in which a thermostat is comprised.

The object of the invention is to produce a very simple and inexpensive construction of thermostatic and electric devices for indicating and giving notice of certain degrees of temperature changes which is especially applicable for employment in incubators or hatcheries, in green-houses, and other places.

The invention consists in constructions and combinations of parts and devices, all substantially as hereinafter described, and set forth in the claims. I

The improved device is illustrated in the accompanying drawings, in which- Figure 1 is substantially a central vertical longitudinal section through the thermostatic device and diagrammatic representation of the circuit connections in which are the battery or generator and a signaling-bell. Fig. 2 is a plan view of the mechanical devices controlled by the thermostat. Fig. 3 is an end view as seen at the left of Figs. 1 and 2. Fig. 4 is a representation of parts in detail on a somewhat-enlarged scale, partly in section, as taken on the line L 4, Fig. 2.

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings, A represents asupport for the thermostat B and for the circuit-closing devices controlled and operated thereby. The said support is constructed in the form of a rectangular casing made of sheet metal and having the cross strap or bar a of thin metal, the extremities thereof being bent at right angles to the spanning portion and riveted to the opposite side walls of the casing, as indicated at 10. On this. supporting bar or strap, which has its position above the open bottom of the casing, is placed the thermostatic disk or wafer 13, which embodies no novelty in itself, the same comprising two diaphragms' or circular sheets of very thin metal, (indicated by 12 and 13,) with the space 14 between them, in which an expansive gas or fluid is contained, the joining circular edges of the two parts being soldered or otherwise hermetically closed.

Upstanding above the top of the support A is the post having theseparated ear-pieces b 1), within which by the pivot d is hung the horizontally-extending lever O, the extremity of which projects within the aperture f, formed in ,the contact-plate g, and having contacts 15 and 16, constituted by the upper and lower margins of the aperture.

There is in metallic connection with the contact the binding-post secured to and extending above the end of the support A.

The enlarged shank portion 17 of the lever C has the vertical screw-threaded hole 18 through it, threading part way through which is the thumb-screw h, and the lower end of this thumb screw constitutes an adjustable abutment or bearing for the vertically-applied thrust-rod i, the upper end of which is extended upwardly within the hole or socket 18, while the lower end thereof rests against the top of the thermostat B.

j represents a spring exerting a downward force upon the lever.

m represents a second binding-post supported on the casing, the one binding-post being insulated from the other, andin the drawings, 77. may be understood as a block or plate of insulating material.

0 represents the circuit conductor or wire,

connected in which is the battery t and the electrically-operated alarm-bell u of a most common and well-known kind, understood as being operative to produce a continued ringing of the bell so long as there is an electric current running therethrough.

The device is to be adjusted so that the extremity of the lever will be, under normal temperatures, removed from contact on both of the contact portions 15 and 16 of the plate g.

Manifestly when the temperature rises in the incubator or other place where the thermostatic device is located the expansion of the thermostat will through the rod 2' elevate the lever and carry the end thereof into contact with the plate at 15, thereby closing the circuit and ringing the hell, it being understood that the bell may be located in the house or in any place where it may be readily heard. On the other hand,- alowering of the temperature down to any degree which is lower than that which is desired to be maintained in the incubator, 850., will cause such a contraction of the thermostat as to permit the lever to fall and establish the alarm-circuit, because of the contact of the lever at the point 16 on the contact-plate 9.

By turning the adj usting-screw 7L either upwardly or downwardly the normal position of the lever relatively to the contact- points 15 or 16 may be such that wider ranges of change in temperature or less wide ranges thereof will result in effecting the closing of the circuit. Thus if it is desired that the alarm shall be given when the temperature where the thermostat is located rises a comparatively-few degrees above the normal the screw it will be turned downwardly, whereby the lever G has its extension in a line which is comparatively near the contact 15. On the other hand, by turning the screw in the other direction a much greater range of rising temperature is provided for before the alarm will be soundcd;bnt in this case acom paratively-slight lowering temperature will cause the sounding of the alarm for the reason that the lever will come to bearing upon the contact 16 under a very slight contraction of the thermostatic disk .13.

As a convenient and desirable construction I provide on the supporting bar or crossstrap a a flanged holder-ring (t having the upturned flaring marginal portion into which the thermostatic disk or water may be readily inserted and retained against accidental dis placement.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In an electric temperature-indicator, the combination with the hollow base provided with the cross-support, the thermostat-disk thereon, the plate secured on the top of the base comprising a binding-post and upstanding earpieces, an upright plate supported on the base suitably distant from the said binding-post plate, and having a recess, a leverrod pivoted in said earpieces and projected through said recess, a thrust-rod between and in bearing on the thermostat-diskand the lever, the eircuit-conductors, a generator and an alarm device, substantially as described.

2. In an electric toinperature-indicator, the combination with the thermostat, the contactplate having the recess, the pivoted lever extending through the recess the rod controlled by the thermostat and engaging the lever, and means for adjusting the normal position of the lever and the margins of said recess, relatively the one to the other, whereby said lever may have greater or less proximity thereto as required, the conductors in electrical connection with the lever and said rccessed plate and a battery and an alarm or signaling device in the circuit, substantially as described.

Signed by me at Springfield, Massachusetts, in presence of two subscribing witnesses.

LESLIE S. YVILDER.

\Vitnesses:

II. S. WILDER, WM. S. BnLLows.

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