US1881150A - Thermostatic circuit controller - Google Patents

Description

Oct. 4, 1932. M. TRAPP THERMOSTATIC CIRCUIT CONTROLLER Filed March 9, 1928 A TTORNEY.

Patented Oct. 4, 1932 UNITED STATES MARTIN TRAPP, F IBELZONI, MISSISSIPPI THERMOSTATIC CIRCUIT CONTROLLER Application filed March 9,

The invention relates to thermostats and more especially to a thermostatic circuit controller of a type adapted to be used in connection with an electric motor to energize said motor at a. predeterminate degree of temperature, whereby the motor is rotated in one direction, and to energize the motor also at a second predeterminate degree of temperature in order to rotate said motor in the opposite direction.

The object of the invention therefore is to provide a thermostat having three electrical terminals, two whereof are arranged on adjustable hands or the like, the third terminal being electrical connected with a thermometer hand, which is adapted to change its position relative to the other hands under the influence of a bi-metal spring supporting said thermometer hand and in electrical connection with the third terminal.

Other objects of the invention not specifr cally mentioned will be easily ascertained and understood from the following description in connection with the accompanying drawing forming a part thereof. It is however to be noted, that the invention is not to be limited or restricted to the exact construction or formation shown in the drawing and described in the specification, but that the invention is only to be limited by the scope of the claim appended hereto.

In the drawing illustrating a preferred embodiment of the invention.

Fig. 1 is a front view of the invention, and

Fig. 2 is a sectional side view thereof.

The thermostat has a face plate 5. On this plate a scale 6 of the degrees of temperature is arranged in any suitable and desired manner. The plate may be provided with ears 7 for fastening the thermostat to a wall or the like. A triangular carrier plate 8 is fastened underneath the face plate5 by means of studs 9 or the like and is held spaced from said face plate. A bimetal spring is fastened to the carrier plate with its inner end and carries at its outer end a thermometer hand 11. This hand may be fastened to said spring by a pin 12 or in any other suitable manner. 60 An electric terminal 13 is provided on the 1928. Serial No. 260,522.

face plate 5 and a wir; it leads from said terminal to a source of electricity.

A pin 15 or the like is fastened in the face plate in such a manner, that the axis of said pin and the axis of the bi-metal spring coincidc.

A hand 16 is pivotally mounted on the pin 15 and is insulated therefrom as indicated at 17. Another hand 18 is also pivotally mounted on the same pin and is also insulated thercfrom as indicated at 19. The outer ends 20 and 21 respectively of the hands 16 and 18 are made of separate pieces of metal and insulation members 22 and 23 respectively connect the parts of each hand with each other. A contact plate 24 and 25 respectively extends at right angles from each 01' the outer ends 24 and 25 respectively, and terminals 26 and 27 respectively are provided on said ends. Electric conductors 28 and 29 respectively 7 lead from said terminals to an electric motor (not shown).

The thermometer hand 11 has its outer end curved toward the face plate and carries a contact link 30.

Supposing the thermostat is to be used to protect a pipe line from freezing. For this purpose a main valve-would be provided in the main of said pipe .ine and a motor would be connected mechanically with said valve to open and close the same in accordance with the temperature. The motor is of the reversible type and connected with the source of electricity and with the terminals 26 and 27 of the thermostat hands. The terminal 13 is also electrically connected with the source of electricity.

The hands 16 and 1.8 are set to the degrees of temperature, at which the main valve is to be closed and opened respectively. When it gets colder the thermometer hand 11 will mo,ve toward the left in Fig. 1 under the influence of the bi-metal spring 10. The link 30 will contact first with'the plate 25 of the thermostat hand 18. The valve being open and the motor being in reverse the closing of the contact between the link and said plate will cause no rotation of the motor or any other change. lVhen it gets still colder the link will contact with the plate 24 of the hand 16. Thereby the circuit from the source of I electricity to terminal 13, face plate 5, pins 9, triangular plate 8, bimetal spring 10, thermometer hand 11, link 30, plate 24, outer end 20, terminal 26 conductor 28 to the motor and back to the source of electricity will be closed.

The motor will be energized, will rotate and close the main Valve and at the same time the olarization of the motor will be reversed.

n consequence the motor will now stand still until it gets Warmer and the ther hand will travel toward the right inFig. 1, whereby the link 30 will come in contact with the plate 25 closing the circuit and energizing the motor, which will then open the main valve and again reverse its own polarization.

It is understood that the above described.

thermostat may be used for all kinds of other purposes, for instance to connect a fire alarm gong with a source of electricity, when a certain degree of heat should occur in a dwelling or the like.

What I claim as new is In a device of the class described a metal face plate, an electric terminal thereon, a

bimetal metal sprin supported by said plate, a thermometer han fastened to said spring, a plurality of metal hands adjustably supported by said plate and insulated therefrom and in relation to each other, an electric terminal on each of-said hands, a contact plate on each of said hands the thermometer hand being provided with an eye, and a metal spring hanging in said eye, and adapted to contact with the contact plates while sliding over the same.

In witness whereof I alfix my signature. MARTIN TRAPP.

Images