US2529259A - For gaseous fuel burners - Google Patents

Description

Nov. 7, 1950 w. E. M CORQUODALE 2,529,259

THERMQSTATIC SAFETY CONTROL APPARATUS FOR GASEOUS FUEL BURNERS Filed Sept. 9, 1947 I m L o N INVENTOR WILMER E. MO CORQUODALE Patented Nov. 7, 1950 UNITED sTAT s PATENT OFFICE I THERMOSTATIC SAFETY CONTROL APPA- RATUS FOR GASEQUS FUEL BURNERS Wilmer ELMcQorquodale, Orange, Tex.

Application September 9, 1947, Serial No. 772,989

2 Claims. (o1.15s 117.1)

whenever gas is admitted thereto; and these de-- vices generally include means for automatically shutting ofi the flow of gas to the main burner whenever the pilot light becomes extinguished, in order to prevent or minimize release ofgas to the atmosphere with resultant, hazard of explosion. Many of these devices, however, areso designed as to permit continued leakage of gas through the pilot burner even though the flow of gas to the main' burneris shut off. While variousarrangements have. been proposed for.

stopping the gas flow to both the mainburner andpilot burner, these generally have the disadvantage of being relatively complicated" and expensive.

It is an object of this invention to provide a simple and inexpensive gas burning apparatus adapted to shut off the flow of gas to the main burner and pilot burner simultaneously whenever the pilot light becomes extinguished.

One specific embodiment of the invention is illustrated in the accompanying drawings in which:

Figure 1 is a plan view of the gas burning apparatus;

Figure 2 is a sectional elevation taken generally on the line 22 of Figure 1; and

Figure 3 is a more detailed view of the pilot shut-off valve taken on the line 33 of Figure 2 with a section of the valve broken away to show internal details.

Referring now to the drawings, the numeral ll] represents a main gas burner having a plurality of gas jets l l Gas is supplied to the main burner through inlet line l2 which is screwed into the bottom of the burner. The inlet to the burner It! includes a constricting portion I3 which provides a valve seat I4 adapted to cooperate with a valve plug I5 to shut off the gas from the main burner l whenever the valve plug is in contact with the valve seat as shown in Figure 2. Valve plug is attached to valve stem I6 which extends upwardly above the burner through a bushing I! which is screwed into the top of the burner at its, center. adapted to permit the valve stem IE to slide up or down as the valve opens or shuts.

Burner I0 is provided with an upwardly projecting shouldernl8 which may be an integral part of thebody of the main'burner, as shown, in the drawings. A bimetallic thermostatic element I9 is securely mounted on the shoulder l8 as by means of screw 20, and extends radially inward toward the center-of the burner and is connected to the upper end of the valve stem I6 in an suitable manner.

of the, valve stem I6 and may be mechanically. connected thereto by means of an extension arm 2| which is'attached to thermostatic element IS; in any suitable manner. Extension arm 2! may be movably connected to the top of valve stem [6 by providing a grooved portion at the end of the arm to intermesh with a grooved portion of the valve stem as shown at 22.

A'pilot burner 23 'is mounted on. main burner l8 directly beneath the bimetallic thermostatic element l9. If desired, a U-shaped shield 2 imayv be provided between the pilot, burner andthe thermostatic elementto keep the pilot-flame from coming into direct contact with the latter. Gas is supplied to the pilot burner 23 by means of a small gas supply line 25 having a valve 26 therein for shutting off the flow of gas. The gas line leading to pilot burner 23 also desirably includes a constricting portion, shown at 32, which restricts the rate of flow of gas therethrough to a small amount at all times.

Various known types of valves will function satisfactorily as the pilot gas valve 26 and any suitable type may be selected. The valve Shown in Figure 3 is illustrative. This valve is designed to be in closed position when the valve plug and stem are in their lowermost position, as shown in Figure 3. A compression spring 33 tends to force the valve plug and stem downward and thus normally to keep the valve closed. Valve 26 is mechanically connected to a movable portion of the thermostatic element !9 by'means of a rod 2'! having an arm portion 2%} for connection with the valve by insertion through its handle portion 30. Rod 27 is threaded at its upper end for receiving adjusting nuts 29.

As illustrated in the drawings, both the main burner valve and the pilot gas valve are in closed position. In order to light the pilot burner, the handle portion 30 of the pilot gas valve may be manually pushed upwardly, thereby opening the Bushing H is.

As shown in Figure 2, thethermostatic element proper may terminate short valve and admitting gas to pilot burner 23 which a element 19 will remain in its upward position until such time as the pilot light becomes extinguished. Whenever this happens,- thermo-- downwardly to the lower position, thereby si 4 to close the valve and thereby shut off the flow of gas to the main burner upon extinguishment of the pilot light, means for supplying gas to said pilot burner, a valve operatively associated therewith for shutting off the gas flow and including resilient means constantly urging the valve toward closed position, said valve being disposed beneath a movable portion of said thermostatic element, and a; vertically positioned rod extending from said last-named valve and connecting slidably with a movable portion of said thermostatic element, said rod being engageable V 'with'the thermostatic element when the latter static element 59 will cool and thereupon flex multaneously closing the main burner valveand" I scribed gas burning apparatus without departing.

from the scope of the invention. The invention is therefore not necessarily limited to. specific details disclosed herein. Having described my invention, what I claim and desire to protect by Letters 1?ate'nt'is:

1. A gas burning apparatus comprising a main gas burner including a hollow body member having a gas inlet located centrally thereof and adjacent its base, a valve seat at said inlet,'a valve plug cooperative with said valve seat for shutting off the flow of gas to the burner when the valve is closed, a securing nut positioned on the upper portion of the body member directly above said valve seat, a valve stem extending from said valve plug through said securing nut and slidably mounted therein, a pilot burner positioned to light the main burner, a bimetallic thermostatic element above the pilot burner extending from adjacent the outer periphery of said body free to move vertically upon flexing of the thermostatic element, an extension arm directl y gon meeting the movable end of said thermostatic element with the upper end of said valve stem 'is actuated upwardly, wherebl said last-named valve is maintained in open position in opposition to said resilient urging means when the thermostatic element is flexed upwardly but closes simultaneously with the main burner valve whenever the pilot light becomes extinguished.

2. A gas burning apparatus according to claim 1 including means for varying the length of the connecting rod between the thermostatic 'ele-i ment and the said'last-named valve to permit adjustment for securing simultaneous closure of the valves.

WILMER E. McCORQUODALE REFERENCES CITED The following references are of record in the,

file of this patent:

UNITED STATES PATENT Germany Sept. '22,

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