US1201469A

US1201469A - Thermostatic controller.

Info

Publication number: US1201469A
Application number: US5284615A
Authority: US
Inventors: George A James
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-09-27
Filing date: 1915-09-27
Publication date: 1916-10-17
Anticipated expiration: 1933-10-17

Description

G. A. JAMES.

THERMOSTATIC CONTROLLER. APPLICATIQN FILED SEPT-27, m5.

1,201 A69. Patented Oct. 17,1916.

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GEORGE A JAMES, OF SAN FRANCISCO, CALIFORNIA.

THERMOSTATIC CONTROLLER.

menace.

Specification of Letters Patent.-

Patented Qct. 1*2, 1916.

2 Application filed September 27, 1915. Serial No. 52,846.

To all whom it may concern:

Be it known that I, GEORGE A. JAMES, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Thermostatic.

Controllers, of which the following is a specification.

The present invention relatesto thermostatic controllers for gaseous fuel.

One object of the invention is to provide such a controller by which some gas, even if a small amount, will always be admitted to the burner; in which the pressure of the gas will be balanced about the valve-actuating mechanism; in which the amount of heat which is transmitted to the controller from the object heated can be varied to vary the sensitiveness of the control';in which the operation of the valve will not be interfered with by the formation of liquid" deposits from the gaseous fuel; to provide'in such a controller means for accurately adjusting the expansion member; and one in which the pressure of thegaseous fuel itself 1 will be used to lift" the valve from off its seat. 4 p I v v A further object of the invention is to provide such a controller in which the temperature at which the controlling mechanism operates will be varied according to whether the fuel is or is not being used to heat a cooking vessel, as to boil water.

In the accompanying drawing, Figure 1 is a vertical sectional view of my improved thermostatic controller applied to 'a radiator; Fig. 2 is an end elevation of Fig. 1; Fig. 3 is a side View, partly in section, of the controller applied to a gas cooking stove; Fig. i is a similar view of the same as applied to an oven.

Referring to'the drawing, 1 indicates a steam radiatorintowliich extends a cylindrical plunger 2 leading through a stuffing box 3 having a suitable bearing 4 in which it can slide and connected at .its outer end with the casing 6 of a controller 7.. To the outer edge of said casing is secured a cover plate 8 having formed therein

conduits

9, 10, which are connected to gaspipes 1'1, 12 leading to and from the controller respectively. The conduit 9 communicates with the interior of the controller by a circular series of small holes 13 the passage of the fuel through which can be controlled by a valve 14 having a stem 16 slidable in a hole situated centrally with respect to the'series of passages. The conduit 10 communicates with the interior of the casing by a hole 17. When the valve is opened, gas can flow through the passages into the controller and out therefrom by the hole 17 into the conduit 10. The valve is made with a mica plate 18 which comes in contact with said seat. It isfound that, owing to the low heat conductivity of mica, practically no condensation of the gas takes place on its surface, and owing to the smoothness of said surface no condensed liquid will remain thereon. Consequently the fit of' the valve to its seat never becomes impaired by the deposition of. condensed gas upon the surface of the valve. Said valve is attached to the free end of, an expansion member 19, the other end of which is rigidly secured by rivets 21 and a block 22 to the'cover plate. The expansion member is additionally, but adjustably, secured to the cover plate near the block 22 by means of a micrometer screw 23 having two threaded

portions

24 and 26 of different pitches screwed respectively through the cover plate and the expansion member. The screw 23 is surrounded by a rubber washer 25 which acts as packing to prevent the escape of gas from the interior of the casing.

Owing to the balanced gas pressure around the valve the Valve is never held tightly to its seat,and'a small amount of,

gas always escapes past said valve. It is desired that such should be the case, and if necessary to produce this result, the mica face, or the seat, of the valve isscratched in order to let the gas escape between the valve and its seat.

The temperature at which the'controller operates can be varied by moving the pluncontrolled by the controller, and the plunger rod 32 enters a -movable cylinder 33, which is extended upwardly to form a stem 34. extended horizontally'at the top to form a disk 35,, which can support a kettle or the like, a coiled spring 36 being interposed between theupper end of the cylinder and the plunger rod, lit a kettle be deposited upon the disk, the disk is immediately lowered by the weight of the kettle acting against the pressure of the spring 36, and since, in that position, a greater extentv of surface, of the cylinder is in contact with the plunger rod, a greater proportion of heat is transmitted to the plunger rod and controller. The controller can be so arranged that, when the water in the kettle is at boiling temperature, the gas fuel is automatically shut off or reduced to a minimum,

Fig, 4 shows .a modification of the inven tion as applied to an oven. In this form of the invention the plunger rod carries a pointer 37, which moves over an indicating scale 3.8, which indicates the temperature at which the interior of the oven should be maintained. By moving the plunger rod in or out, any desired temperature of the oven can be maintained by controlling the supply of gas so as to producesaid temperature in the oven.

ll claim a a v 1. A thermostatic controller for fuel gas comprising a casing connected by heat con ducting material with an object heated by the combustion of said. gas, a thermostatic member in said casing, and'a valve controlling the passage of said gas to the object' to be heated, and adapted to be raised from its seat by the pressure of the gas, and to be seated by the expansion of said thermostaticv member. I

'2. A thermostatic controller for fuel gas comprising a casing connected by heat conpart. I

In testimony whereof I have hereunto set neonate I ducting material with an object heated by the combustion of said gas, a thermostatic member in said casing, and a valve-controh ling the passageof said gas to the object to be heated havlng a'mica face to contact with its seat, and adapted to be raised from its seat by the pressure of the gas, and to he seated by the expansion of said'thermostatic 1 member. v

3. A thermostatic controller for fuel gas comprising a casing connected by heat conducting material with an object heated by the combustion of said gas, a thermostatic member in said casing, and a valve in said casing controlling the entrance of gas into the casing and the passage of said gas tothe object to be heated, and adapted to be raised from its seat by the pressure of the gas, and to be seated by the expansion of said thermostatic member.

4:. In combination, a ring gas burner, a

metallic part extending upwardly there through and adaptedto contact with a vessel placed upon said burner to be heated thereby, a thermostatic controller fixedly secured relatively to the burner, a second metallic part supported thereby and engaging said first-named part, and aspring between parts, supporting the first-named the two my hand in the presence of two subscribing witnesses.

GEORGE A. JAMES, Witnesses:

, ll. M. .WRIei-rr D. B. RICHARDS.