US1748306A - Automatic safety device for gas stoves - Google Patents

Description

Feb. 25, 1930.

C. M. PATTY 5R AUTOMATIC SAFETY DEVICE FOR GAS STOVES Filed Dec. 29. 1928 2 Sheets-Sheet l AUTOMATIC SAFETY DEVICE FOR GAS STOVES I Filed Dec. 29. 1928 2 Sheets-Sheet 2 fnvenmr Aitarnqy Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE CHARLES III. PATTY, SE, OF MARSHALL, ARKANSAS, ASSIGNOR OF ONE-HALF TO B. D.

, WEAVER, 0F MARSHALL, ARKANSAS AUTOMATIC SAFETY DEVICE FOR GAS STOVES Application filed December 29, 1928. Serial No. 829,118.

The present invention relates to improvements in safety devices for gas stoves and the like, and has for its principal object to provide a device for automatically cutting off the flow of gas to the burner should the burner accidentally blow out.

Another important object is to provide a safety device of the above mentioned character that includes a thermostatic unit for effecting the actuation of the cut-off means in a positive and eflicient manner should the light of the burner go out, the device embeing disposed for cooperation, with the thermostatic means to .maintainthe valve holding means in an operative position under normal conditions.

Another important'object is to provide asafety device of the above mentioned character that is simple in construction, inexpensive, strong and durable and further well adapted to the signed.

Other objects and advantages of the invention will become apparent from the following description when taken in connection with the accompanying drawings.

In the accompanying drawings wherein like reference characters indicate corresponding parts throughout the same:

Figure 1 is a side elevation ofthe safety device embodying my inventionshowing the same associated with a main fuel supply pipe of a gas stove. z

Figure 2 is a vertical sectional view taken approximately on the line 22 of Figure 1.

Figure 3 is a top plan view of the invenpurpose for which it isdetion therewith, and

Figure 4 is a sectional view taken approximately on the line 44 of Figure 3.

In the drawings wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates the main gas supply pipe from which extends the jet pipe 2 for supplying gas to the burner3 which burner may be of the conventional construction such as is found on gas stoves now generally inus e.

Arranged in the jet pipe 2 for regulating the supply of the gas to the burner 3 is the rotary valve 4 that includes a rotary plug having an actuating handle 5 associated therewith. This rotary valve is also of the conventional construction, and a detailed description thereof is therefore believed unnecessary in so'far as the present invention is concerned. j

A valve body 6 is arranged inthe main fuel supply pipe 1, and arotary plug 7 is mounted in the valve body 6 for controllin the flow of the gas through the pipe 1.

horizontally extending arm 8 is formed on' the upper end of the rotary plug 7 for actuating the same and the outer end of this arm is provided with an n wardly disposed foot 9, the purpose" of which will be presently described.

An axial coil s ring 10 encircles the lower projecting end 0 the plug 7, one end of this spring bemg connected to the bottom of the valve body 6, while the other end has connection with a cross pin 11 carried by the lower end of the plug 7. This spring normally maintains the rotary plug 7 1n a closed position cutting offv the supply of the gas through the pipe 1. I

Forming a s'alient part of the present invention is the frame 12 that' is secured on the fuel supply pipe 1 by the clamping bands 13 for disposition adjacent the valve body 6 and this frame extends upwardly from the main gas supply pipe 1.

Arrangedwithin the upper portion of the frame 12 ,is the thermostatic unit denoted generally by the numeral 14, and this thermostatic unit comprises the vertically arranged upper and lower Waters 15 and 16,

respectively;

An adjusting screw 17 extends through the intermediate portion of the cross bar 18 of the frame 12 for engagement with the central portion of the bottom of the lowermost wafer 16 while extending from the top of the uppegmost wafer is the pin 19, the top of the frame 12 being formed with an opening to permit the free vertical movement of this pin therethrough.

The lower portion of the pin is formed with an annular groove 20 to accommodate the forked end of a lever 21 that is pivoted at its outer end at one side of the frame 12 for vertical swin ing movement.

The pivoted end of the lever 21 is formed with a depending angularly disposed trigger 22, the lower end of whichis adapted to cooperatively engage with the upstanding foot 9 formed on the outer free end of the arm 8 to hold the spring actuated valve plug 7 in an open position under certain conditions. Suitable guide means shown generally at 23 is associated with the frame and the vertically swinging trigger 22, as indicated in Figures 1 and 3( A substantially U-shaped burner 24 is supported on the frame 12 in such a manner that the jets of this U-shaped burner are disposed beneath the bottom of the lowermost wafer 16. A gas supply nipple 25 is associated with this U-shaped burner 24, and gas is delivered to this nipple by means of a supply tube 26 that extends from the jet pipe 2. A manually operable valve 27 is arranged in the nipple 25 to regulate the supply of gas to the U-shaped burner 24. i

When the parts are arranged as shown in Figure 1, the burner 3 is lit as is also the burner 24 and the heat will cause the wafers 15 and 16 of the thermostatic unit 14 to expand whereby to maintain the trigger 22 in engagement with the foot 9 so that the valve 7 is held in an open position permitting the gas to be supplied to the main burner 3 while the Valve 4 is in an open position. Should the flame of the burner 24 accidentally go out, the wafers 15 and 16 of the thermostatic unit 14 will automatically contract causing a downward movement of'the pin 19 with the result that the lever 21 will swing'downwardl y and at the same time the trigger 22 will swing upwardly out of the path of movement of the foot 9 and. the spring'lO will auto matical- 1y actuate the plug 7 to move the same to a closed position, thereby cutting oil supply of the gas to the mainburner 3.

By actuating the valve 4 to cut off the supply of the gas to the burner 3 manually, the gas will also be turned off to the U-shaped burner 24. r Y

The valve 7 may be again turned to an open the foot 9 so that said valve plug 7 will be maintained in an open position to permit the flow of the through the pipe 1 to the main burner 3, providing of course that the valve 4 is in an open position.

The provision of a safety device of the above mentioned character will absolutely prevent the escape of gas in the room, and causing loss of life. Furthermore, the simplicity of my device enables the same 'to be readily and easily installed on a gas stove without necessitating any material alterations. Also, my device will at all times be positive and efficient in carrying out the purposes for which it is designed.

While I have shown the preferred embodiment of my invention, it is to be understood that minor changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention and the scope of the appended claim.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent is In a safety device of the class described, a gas supply pipe, a rotary valve mounted in the pipe, spring means associated with the rotary valve for normally maintaining the same in a closed position, an arm extending laterally from the upper end of the rotary valve, an upstanding substantially rectangular frame disposed longitudinally on the pipe adjacent the valve, clamping rings integrally connected to the opposite ends of theframe and encircling the pipe for securing said frame thereon, a cross bar extending longitudinally of the frame between the upper and lower ends thereof, a thermal element disposd between the cross bar and the upper end of the frame, means for adjustably mounting the thermal element in the frame, a burner mounted on the frame beneath the thermal element, and a lever operatively connected with the thermal element for actuation thereby to hold said valve in open position. V

In testimony whereof I afl'ia my signature.

CHARLES M. PATTY, s

position by swinging the arm 8 into position for engagement with the trigger22 and by igniting the burner the expansion of the hermostatic unit 14 will effect the actuation

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