US1616494A - Safety cut-off mechanism for gas burners - Google Patents

Description

316,494 Feb. 8, 1927. L HILL,

SAFETY CUT-OFF MECHANISM FOR GAS BURNERS Filed Nov. l, 1933 1,5 ATTORNEY Patented Feb. 8, 1927.

LOUIS Him, or AKRON, OHIO.

SAFETY CUI OFF MECHANISM FOR GAS BURNERS.

Application filed November 1, 1923. Serial No.. 672,043.

My invention relates to safety cut off mechanismfor gas burners, my more particular purpose being to provide a device of this type made up of a small number of parts easily manufactured and assembled and readily standardized, the operation of the parts being such that whenever the burner flame is, extinguished by a gust of wind or other analogous accidental cause, so as to have gas flowmg through the burner, the supply of gas to the burner is automatically cut off.

A special object of my invention is to so constructand arrange the various parts that my device as a whole may be treated as an attachment, and as such may be readily placed upon or' 'removed from existlng gas burners of many difl'ferent kinds, now in com-- mon use,:butwithout the necessityfor any 7 substantial mechanical change in the burner and without the use of any tools, except, if necessary, those of the simplest kind.

A further purpose of my invention is the provision of alarm mechanism of simple form, for the purpose of indicating to the operator certain changes taking place in the condition of the apparatus while the latter is in use, or is bein set for use.

Reference is ma e to the accompanying drawing forming a part of this specification, and in which like reference characters indicate like parts throughout the severalfigures.

Figure 1 is a fragmentary plan view of a burner suitable for an ordinary gas stove, and provided with a burner equipped with my improve safety cut' oif mecl'ianism.

Figure 2 is a side elevation of the mechanism appearing in Figure 1. Figure 3 is a fragmentary section through the casingused for holding the spring op-.

erated plunger and parts immediately associated therewith, used for controlling the gas valve.

Figure4 is a section on the line 4-4 of ried by this valve plug is a handle 11, whereby 1t maybe actuated, in the usual manner. When the. handle 11 occupiesthe position mdicated for it by full lines in Figure 1, the gas 1s cut off. lVhen, however, the handle is turned so as to occupy the posit-ion indi cated for it by dotted lines in Figure 1, gas 18 free to flow through the jetpipe 7 into the mixing tube 6, and thence into the burner. Thus the operator, in order to turn the gas on or oil, merely grasps the handle 11 and turns 1t from one to the other of its two normal positions by full and dotted lines in Figure 1.

Encircling the handle 11 is a collar 12, and connected with this collar, by means of two links 13 and 14, is a sliding rod 15. This sliding rod extends into and is slidable 'rela-.

tively to a casing 16 of substantially cylindrical form. Slidabl mounted within the casing 16, and secured rigidly to the sliding rod 15, is a piston 17. This piston is engaged by the adjacent end of a spiral spring 18, which is housed within the casing. The spring is always under tension, and tends to force the piston 17 and consequently the slidintegral with it, and extending toward the casing 16. v

The casing 16 is provided with a slot 26, located in proximity to' the lug 25, and so positioned that when the rocking lever 23 is moved from the position indicated for it by full lines in Figure 4 to the position indlcated for it by dotted lines in said figure, the lug 25 extends through the slot 26.

The rocking lever is at itslower end provided with a beveled portion 27, and adjacent this portion is a spring arm 28, secured in position by a fastenin 29 and carrying a metallic weight 30, serving as bell clapper. The spring arm is further rovided with two loops 31 and 32 bent slightly. upward as indicated in Figure 4;

into which t e lug 25 extends, as indicated in Figure 4. A small bell 34 is mountedupon the casing 16, in close proximity to the spring arm '28, and in such position as to I enable it to be struck by. the clapper 30, in

the event of the spring arm 28 making a stroke in theright direction for this purose. P Whenever the piston '17 is moved to the left according to Figure 3, due tothe movement of the handle 11 from its position ,indicated by full lines in Figure 1 to its position indicated by dotted lines in said figure, the piston 17 travels past the loo 32, and in so doing pushes this loop slig tly outward andthen allows it to sprin back abruptly, the net result being that tlie clapper is first moved slowly away from the bell 34 and then caused to strike the bell forcibly,

so as to produce an audible sound. This sound isproduced at the instant when the piston 17, during its travel to the left according to Figure 3 .clears the loop 32, 'so that this 100 inwardly. T e sound of the bell apprises the operator that the piston is at the limit of its travel tothe left according to F igure 3, and consequently that the as is flowing freely. through the valve, an in condition to be lighted.

Whenever the handle 11 is thus turned into the position indicated for it by dotted lines and the flow of gas is thus turned on as just described, the tension of the spring 18 tends to shift the piston to the right according to Figure 3, and thus to cause the valve to close, unless the gas be lighted at the burner. Therefore the operator holds the handle 11 in the position indicated'for iti-by dotted lines in Figure 1, and meantime lights the gas. The burner is thus heated, the temperature of the thermostatic through the slot 26 a s bar being raised, so that-the upper portion of the bar according to F1gure3 is moved from the position indicated for it by full 'lines into the position indicated for it b dotted lines in this figure. The result is that the rocking lever 23 is roclred 1n a counter-clockwisedirection, as indicated by full and dotted lines in Figure 4. Thisv movement causes, the in 25 to extend serve, for the timebeing, as a stop for the piston 17 Thereupon 'the operator releases the handle 11, which now remains in theposition indicated for it by full lines in Figure 1, because the sliding rod 15 can not move to the right according to Figure 3, so long as the piston 17 rests against the lug25.

The gas continues to flow and to burn as long as the various movable parts occu y the respective positions contemplated or them with the apparatus in the condition just described;

-dle 11 in the position indicated for.

can move a slight distance.

an l do not limit myse cient distance to tinguished bya gust of wind or in some analogous manner, so 'as to leave the gas flowing through the burner and escaping unburned. The thermostatic bar 20 now begins to cool rapidly, so that this bar and the rocking lever 23 controllable thereby move from the positions indicated for them by dotted lines in Figures '3 and 4 into the positions indicated for them by 'full lines in these figures. This movement. of the looking lever-.23 carries the lug 25 to the left according to Figure 4, and it thereupon rclcases the piston 17. This causes the sliding rod 15 to move suddenly to the right'according-to Figures 1 to .3, inclusive, thus abruptly closing the valve by turning the handle 11 in a counter-clockwise direction according to F igure 1, and leaving the hall:-

it y full lines in this figure. Y

A'shackle 35, shown more particularly in Figures 1 and'2, is rovided'with a screw bolt-36 and is forme and arranged for use therewith as a coupling. 13 means of this coupling the' casing 16 ,an parts-carried thereby, considered collectively as a unit, may be detachably mounted uponor readily removed from the mixingtube 6. For this purpose my device may be considered as an attachment to be placed .upon or removed from gas stoves or analogous apparatus, already in use. j

, he operation of my device may be readily understood from the foregoing description. Y Inorder to light the gas, the operator grasps the handle 11. and turns it in aclockwise direction until the bell rings. Holding the handle in the position it now occupies, the operator lights the gas'and waits until the bell rings again, whereupon he releases the handle 11. The gas now continues to burn until shut off by a movement of the handle. p

The handle 11 may be operated by hand. at time, to eitheropen or close the valve.

f to the precise mechanism here illustrated and described, as variations may be 'made therein without departmg from my invention, the scope of which- L, 1. device of the character described, comprising a gas burner, a mixing tube connected therewith, a jet pi extending into said mi ringtube for supp ying gas through said mixing tube said burner, a valve vmounted u on said et pipe, mechanism connected wit said valve for closing the same, I

a spring connected with said last mentioned mechanism, a casing m which said spring is vhoused, said casing being provided with an opening, a lever carried by said casing and journaled to rock, said lever being provided wlth a lug, located adjacent said opening in said casing, so that said lever can prevent said spring from causing the closure ofsaid mostatic bar being located adjacent said burner in order to be actuated by heat therefrom.

1 2. A device of the character described comprising a gas burner, a jet pipe for supplying gas to said gas burner, a valve mounted upon said jet pipe for controlling the flow of gas thcrethrough, mechanismv connected with said valve for closing the same, a spring connected with said last mentioned mechanism, a casing in which said spring is housed, said casing being provided with an opening, a lever mounted upon said casing and journaled to rock, said lever being provided with a lug located adjacent said opening in said casing, said lever being so located as to enable saidlug to prevent said spring from causin the closure of said valve, and heat control ed mechanism carried by said casing and connected with said lever for the purpose of actuating said lever.

3. A device of the character described comprisin a burner, a' jet pipe connected with said urner for supplying gas thereto, a valve for opening and closing said jet pipe, a casing mounted adjacent said valve and having asubstantially tubular form, a

sliding rod sliding into said casing and movable relatively thereto, connections from said sliding rod to said valve for enabling said valve to be actuated by said sliding rod, a spring having a general cylindrical form and fitted into vsaid casing, said spring being connected with said sliding rod in order to move *said sliding rod and this close said valve, a lever for holding said sliding rod in a predetermined position against the tension of said spring, and thermostatic mechanism connected with said lever for the purpose of releasing said spring, said thermostatic mechanism being located adjacent said burner and controllable by'heat therefrom.

v Signed at Akron, in the county of Summit and State of Ohio, this 30th day of October, 1923.

LOUIS HILL.

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