US2470268A - Safety thermostatic control for - Google Patents

Description

May 17, 1949. M. ROWAN SAFETY THERMOSTATIC CONTROL FOR GASEOUS BURNERS Filed March '7, 1945 INVENTOR.

J'TTO AWYZ Patented May 17, 1949 SAFETY THERMGSTATIC CONTROL FOR. GASEOUS BURNERS Maurice Rowan, Richmond Hill, N. Y.

Application March. '7, 1945, Serial No. 581,375

1 Claim. 1

This invention relates to the combination with one or more gaseous fuel burners of a thermostat arranged to be acted on by the pilot flame of the burner or burners, and having means for shutting off the flow of gas or fuel oil, which will operate when the pilot flame ceases.

One of the objects of the invention is the provision of a combined shut off valve for the fuel line and a thermostat, which will remain inoperative so long as the pilot flame is active, but which will react to close the valve when the flame is blown out, or when the flame ceases through the loss of pressure.

Another object of the invention is the provision of a thermostatically controlled shut ofi fuel valve, with a manually controlled by-pass, so arranged that when the valve is closed by the action of the thermostat the fuel flow may be opened to the pilot burner, until the thermostat is cooled sufiiciently to resume a normal condition for operation.

With the above and other objects in view the invention comprises certain new and useful constructions, combinations and arrangements of parts, clearly described in the following specification, and fully illustrated in the accompanying drawings, in which:

Fig. l is a plan view, showing the invention applied to a gas burner set which includes four individual burners and a single pilot flame burner, located centrally thereof.

Fig. 2 is a sectional View, taken on line 2-2 of Fig. 1, looking in the direction of the arrows.

Referring to the accompanying drawings, which illustrate the practical embodiment of the invention, 5 designates a gas range or stove, having a plurality of individual gas burners 6, supplied through the fuel supply pipe I, and the Bunsen-mixers 8, in the usual manner.

Gaseous fuel is supplied to the pipe 1 by the service pipe 9, in which the shut-off valve In is installed. This shut-off valve is provided with a valve stem I l, on which the crank arm or lever I2 is mounted, and this crank arm or lever is pivotally connected to the outer end of the thermostat rod l3, which is enclosed by the aligned tubes l4 and i5, the inner ends of which are spaced from each other by the distributor l6 of the pilot flame burner H.

The distributor l6 of the pilot burner I1 is equipped with four distributor or flame tubes it, which extend radially to the individual burners 6. The thermostat rod l3 engages a stop I9 in the outer end of the tube l5, which prevents endwise movement of this rod, and this stop acts as a thrust bearing for the thermostat rod, and the thermostat rod can contract or extend only in the direction of the valve.

The pilot flame of the burner ll acts directly on the thermostat rod, and normally maintains this rod expanded, and when so expanded the valve is kept open. But when the pilot flame is blown out, or the pressure drops so that the flame ceases, then the thermostat rod will contract by cooling, and this cooling or contraction will close the valve, thereby shutting off the flow of gas to the pilot burner and the individual burners of the range.

The pilot flame can be projected through each of the distributor tubes, so that each of the burners 6 will have its own local pilot flame.

When the thermostat rod contracts and closes the valve l0, flow to the pilot flame burner 11 may be temporarily renewed by opening the small screw by-pass needle valve l9a, so as to allow gas to flow through the by-pass pipe 20 to the pipe 2| which supplies gas to the burner ll, from the valve Ill.

The flow of gas to th pilot flame burner is increased by the operation of the manual valve 22, which controls the flow of gas through the auxiliary supply pipe 2| from the supply pipe l. When this pilot burner valve is opened the flame of the pilot burner is increased to such a degree that flames ar propagated through the distributor tubes l8 to the individual burners. The distributor I6 is provided with air intake openings [6a, so that an ample air supply will enter the distributor to support the consumption required when the valve 22 is opened.

It is understood that the invention may be applied for the control of oil burners, which employ a pilot flame burner, or which can be adapted to employ such a burner.

It is also understood that various changes in the details of construction, their combination and arrangement may be made, and that all materials available for the construction required may be used, within the limits of the invention, as defined by the claim hereof.

M 2,470,268 3 4 Having described my invention, I claim as new: tion therewith, said rod being contractible from The combination with a stove having a plurality its engagement with the one tube to its connecof gaseous burners, a pilot flame igniter having tion with the turn valve.

a burner and distributor chamber means support- MAURICE ROWAN. ing the burner and surrounding the same, a hori- 5 zontal flame ignition tube extending to each REFERENCES CITED burner from said chamber means a gas Supply The following references are of record in the pipe for the pilot burner, a turn valve therefor, file of this patent; a pair of tubes connected with the distributor chamber means and extending from opposite 10 UNITED STATES PATENTS sides thereof in axial alignment with each other, Number Name Date the outer end of one of said tubes being closed, 1,356,103 Witt Oct. 19, 1920 and a thermostatic rod having an end portion 1,687,358 Bach Oct. 9, 1928 engaged with the closed end of said last-named 1,708,446 Klega Apr. 9, 1929 tube and extending through the opposing tube 15 1,856,641 Kalo May 3, 1932 and pivotally connected with the valve, said 1,936,001 Valmore Nov. 21, 1933 thermostatic rod extending through the chamber 1,971,704 Castonguay Aug. 28, 1934 means and directly over the pilot burner to be 2,011,111 Mantz Aug. 13, 1935 heated by the flame thereof and adapted to con- 2,048,065 Gauger July 21, 1936 tract when said flame is extinguished to close the 20 2,077,890 Methudy Apr. 20, 1937 valve by such contraction, said tubes being 2,091,550 Kindl et a] Aug. 31, 1937 greater in internal diameter than the diameter of 2,093,152 Mantz Sept. 14, 1937 the rod whereby to permit the free deflection of 2,248,737 Beam July 8, 1941 the rod throughout its entire length and the 2,256,998 Brumbaugh et al. Sept. 23, 1941 turning of the valve through its pivotal connecg5

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