US2271813A - Thermostatic break and make control - Google Patents

Description

Feb. 3, 1942. J c 'np JR 2,271,813-

THERMOSTATIC BREAK AND MAKE CONTROL Filed Dec. 13, 1939 INVENTOR series.

Patented Feb. 3, 1942 THERMOSTATIG BREAK AND MAKE CONTROL John Edward Clayton, Jr., Milltown, N. .J. Application December 13, 1939, Serial No. 308,922

1 Claim.

My invention relates to improvements in thermostatic break and make control to be used in conjunctionwith automatic heating'and with an electriccircuit. It relates more particularly to such control as to shut off the heating system when it has reached a certain point, i. e. it works like an ordinary thermostat at usual heating temperature of" about 80, and only operates to shut oil the current, and hence the heating system when an excessive heat or temperature is reached. Then the control shuts off the heating system and it takes manual efiortto restore or put in motion the heating system, i. e. to again make the circuit, its mainpurpose being to save the time which elapses between when a fire commences and the firemen-arrive to shut ofi the heating system and thus prevent the spreading of the fire. If the furnace was allowed to continue burning between the time the fire breaks out and the firemen arrive, and if, for example, the furnace is an oil furnace, it may cause the spread of oil about the. furnace andthus add considerably to the extent of the fire. If the furnace is immediately shut off then that fire hazard is eliminated and the amount of loss is thus greatly reduced. Furthermore, it can be set so that it breaks the heating system and may be set to avoid an overheated condition, which if continued would give rise to a fire and it thus avoids the possibility of a fire. It may be set to operate as low as 80 Fahrenheit, which is an exceedingly low rate. There is a play of about 100 to 150% depending upon the thickness of insulated strip which breaks the contact, i. e., while the bi-metal strip maybe set to pull away from the contact point at 80 the contact may again be reunited unless there is a varianceof from 100 to 150, depending upon the thickness of cuit can only be restored by manual operation so that it may not be restored automaticallyand thus again permit the condition it was invented to correct. To date there is nothing like it on the market and it is not only novel but of a distinct benefit to mankind.

One form of my invention is illustrated in the accompanying drawing in which Figure 1 shows a front elevation of thermostatic control in "on position. Figure 2 is a section on line 2-2 of Figure 1. Figure 3 is a mostatic control in on position. wiring diagram of thermostatic control. Reading on Figuresl to 4 of my drawingthey consist of Bakelite base plate I 0, mounting post for thermostat I I, shoulder portion of mounting post the insulated strip which up to that point merely idles along the contact screw until the temperature approaches the danger point and raises 100 to 150 degrees at which time the bi-metal strip is pulled far enough ,from allow the insulated strip to go between the contact point and the bi-metallic strip and thus deflnitely break the contact which then requires manual effort to restore the contact. Thus there is an allowance for reasonable flexing of the temperature.

It has no parts to get out of order and no complicated mechanism. It can be made to sell for a nominal cost. It is used at all times in circuit and is hooked up with a buzzer system in When the danger point is reached the circuit is broken and the buzzer rings. The cirthe contact point to e through stillanother terminal post 24 I2, fastening nut for mounting post l3, spiral portion of thermostat l4, bimetallic contact strip I5, contact point for blower motor I6, hub portion' I], insulated lock arm l8, pivot screw l9, weight portion 20, buzzer contact strip 2|, contact point for buzzer 22, terminal post 23, terminal post 24, shoulder. portion 25, fastening nut for terminals 26, adjustable contact screws 21,

contact portion of screws 28, main line 29, motor return line 30, blower motor 3 I, blower 32,

connection of contact portion of motor 33, conto main line 34, con-' nection of thermostat I4 nection for contact portion to buzzer 35, buzzer 36, connection from buzzer to main line 31.

In operation the thermostat is hooked up to the main line (current) through one of its mounting posts and to the motor through one of its terminal posts 28, and in series to a buzzer as shown in Figure 4 of drawing. When the mbtor is in operation the circuit remains continuous but as soon as the heat of the furnace, or other heating element, over which the thermostat is hung,

reaches a temperature over Fahrenheit, or to whatever temperature the thermostat is set, the spiral portion of the thermostat immediately expands along its line of curvature and toward the buzzer contact strip, but only at a variance of to degrees, as previously stated, which strip is then attracted to its terminal and the bimetal contact strip is drawn away from its contact point connecting the motor to the mainline and the insulated arm then swings between the contact point which connects the main line with the'motor and thus breaks the current and the buzzer connection is then formed and gives the warning. The insulated lock arm remains in its position until manually removed, and the motor and the heating-system in the interim remains front elevation oI'ther Figure 4 is abroken. Thus the danger point of the continued heating is eliminated and there being no automatic turning of the insulated arm it is assured that the contact remains broken and will stay in that position until changed. The mechanism is simple and not the type that will get out of order and will not need fixing and continued tempering or adjusting.

The insulated arm may be made out of any insulated material. I prefer Bakelite. The other parts of my device can be made out of and in accordance with standard regulation material as may be seen from the drawing and specification, and operates preferably on low voltage.

While I have illustrated my invention in one form only and as made of specific materials, I do not intend to limit myself to that particular design, method or materials, as it is apparent that other designs, methods and materials may be employed for obtaining the same results with- 20 from.

in the scope of my claim without departing from the scope and spirit of my invention.

I claim:

In a device as described comprising, in combination with a thermostat which makes and breaks the current, an insulated unit which unit is attached to one side of said thermostat at a point near where the said thermostat makes a contact to complete a circuit, said unit being of suflicient length to project past said contact point, said unit working on a pivot on the end which is attached to said thermostat, the other end of said unit being tree to rotate and having a weight to swing said unit into action when the current is broken by the thermostat, said unit going between the contact point and the place of contact with the thermostat, and preventing the thermostat from making'further contact until said insulated unit is manually removed there- JOHN E. CLAYTON, JR.

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