US1850646A - Automatic gas cut-off - Google Patents

Description

March 22, 1932. ROSS-WATT 1,850,646

AUTOMATIC GAS CUT-OFF Filed March 12, 1950 2 Sheets-Sheet 1 A Inventor G 902319 Ross Wafi A iiorney v March 22, 1932.- 55w 1,850,646

AUTOMATIC GAS CUT-OFF Filed March 12, 1930 2 Sheets-Sheet 2 Inventor George Ross-Wait A itorney Patented Mar. 22, 1932 UNITED s'rArss PATENT oFFrcs GEORGE BOSS-WATT, OF BRONX, NEW YORK AUTOMATIC G48 GUT-OFF Applhation filed March 12,19ao. Serial m. 435,270.

gas cooking ranges but it is to be understood that an automatic cut oil constructed in accordance with this invention may be used in association with any type of gas burners for which the same is found adapted and desirable.

The primary object of this invention is to provide, in a manner as hereinafter set forth, an automatic gas cut of? which is thermally actuated and which functions automatically to shut off the supply of gas to the burner should the flame be extinguished as by an interruption in the supply pipe and which further embodies means whereby the valve will remain closed until manually opened to permit the passage of gas to the burner.

Another important object of the invention is to provide an automatic gas cut off of the character set forth which embodies a valve adapted to remain open for the passage of gas to the burner only when said burner is lighted and which further embodies an arrangement which requires that the valve be manually retained in open position until the burner is lighted.

A still further important object of the invention is to provide an automatic gas cut off embodying manually operable setting or opening means in the form of a spherical knob or handle adapted to prevent the valve being retained in open position by means other than the hands of the operator.

Other objects of the-invention are to provide an automatic gas cut off of the character set forth which may be expeditiously mounted in operative position for use on a gas range, which will be simple in construction, strong, durable, efiicient in its use and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of theinvention may become apparent from a study of the following specification, taken in connection with theaccompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein Figure 1 is a fragmentary view in perspective of one corner portion of a gas range showmg an automatic cut off device constructed in accordance with this invention mounted in operative, position thereon.

Figure 2 is a view in vertical longitudinal section showing the cut off valve in closed position.

Figure 3 is a vertical longitudinal sectional view showing the cut off valve in open position'to permit the flow of gas to the burner.

Figure 4 is a horizontal sectional view taken substantially on the line 4-4 of Figure 3 looking downwardly in the direction indicated by the arrows.

' Referring'to the drawings in detail, the reference character 1 designates the top of a conventional gas range having the burner 2 to which gas is supplied from the pipe 3 through" the medium of the mixing tube 4.

The plpe 3 is in communication with the outlet port 5 located on one side of a gas chamber 6 formed on themetallio casing or. housing 7 which is suspended beneath the top 1 of the gas range. The chamber 6 is further provided with an inlet port 8 with WhlCll communicates the gas supply pipe 9 which is detachably secured thereto by the coupling collar 10. The inner end of the Inlet port 8 is formed to provide a valve seat 11 upon which is engageable a reciprocating valve 12 rigidly mounted on a rod 13 which extends slidably through a closure plug 14:

into the casing 7. The plug 14 is provided with suitable packing means 15 to prevent leakage of gas around the rod 13 from the chamber 6 into the casing 7 The end of'the rod within the casing 7 is o eratively connected through the medium 0? the pin and slot connection 19 to the lower end portion of a valve retaining lever 20 which is mounted for swingin movement in the casing 7 through the me ium of the shaft 21 which is mounted rotatably in the sleeve 22 which projects inwardly from one of the side walls of the casing 7 The shaft 21 is Iprovided with a polygonal end portion 23 w ich extends through an intermediate portion of the retaining lever which is fixed thereon through the medium of the set screw 24. The upper end portion of the retaining lever 20 is notched or recessed as at 25 for 0. pur ose which will be presentl set forth.

A t ermal element designate generally byothe reference character 26 is sup orted .a ve the burner 2 to be played u on y the flame from said burner through t e medium of a supporting arm or bracket 27 which is clampe on the mixing tube 4. The thermal actuatin device 26 comprises a body portion 28 aving a longitudinal passage 29 therein which communicates with a cylinder 30 formed in one end thereof. Threaded on the end of the member 28 in which the cylinder 30 is provided is a tube 31 which is filled with mercury and which has mounted :5 therein a perforated plug 32 through which the mercury may pass from the tube 31 into the cylinder 30.

An actuating wire or rod 33 extends through the passage 29 into the cylinder 30 and hasfixed thereon the piston 34-mounted for reciprocatory movement in the cylinder 30. The cable or rod 33 is flexible and extends slidably through a flexible housing 35 which has one end secured to the member 28 through the medium of the clamp nut 36 and its opposite end. secured to the casing 7 through the medium of the clamping nut 37. The rod 33 projects into a cylindrical opening 38 in the casing 7 with which the housing 35 communicates. The head 39 is mounted for sliding movement in the cylindrical opening 38 and is fixed on the end of the rod 33 for actuation thereby. The head 39 is disposed in abutting engagement with the head 40 which is mounted on the adjacent end of a rod 41 slidably mounted in the supporting brackets 42 and 43 mounted on one of the side walls of the casing 7. A collar 44 is fixed on the rod 41 in spaced relation to the supporting bracket 43 and a coil s ring'45 encircles said rod and has one end impinged against said bracket 43 and the opposite end impinged against the collar 44 in a manner to yieldingly urge the rod 41 and the head .40 into engagement with the head '39 on the flexible actuating rod 33. The rod 41 is operatively connected through the medium of the, pin and slot connection 46 to the upper end of a pivotally mounted keeper 47 which is mounted for swinging movement, as at 48, in the casing 7. The lower end of the keeper 47 is adapted for engagement in the recess 25 of the valve retaining lever 20 in the manner clearly illustrated in Figure 3 of the drawings for the pur ose of maintaining the valve 12 disengage from. the seat 11. One end of the casing 7 is provided with an opening 49 whereb access ma be had to the interior of sai casing an said opening is closed by a removable closure plate 50. As clearly illustrated in Figure 4 of the drawings, the opening 49 extends on one end and one side of the casing and the closure plate 50 is of angular form and secured in place through the medium of the screws 51.

In use, when it is desired to light the burner '2 the operator actuates the retaining lever 20 through the medium of the s herical knob or handle 52 fixed on one end 0 the shaft 21 in a manner to swing said retaining lever 20 to the position indicated in dotted lines in Figure 2 of the drawings and in full lines in Figure 3. This moves the valve 12 to open position with respect to the seat 11 through the medium of the rod 13, as will be obvious, against the tension of the coil spring 18. Gas then flows from the pipe 9 through the chamber 6 and the pipe 3 to the mixing chamber 4 and the burner 2 and is ignited by the operator. When the flames pla on the tube 31, the mercury therein is heate and expands and passes through the port in the plug 32 into the cylinder 30 of the member 28 in a manner to actuate the piston 34 and the flexible rod 33. As illustrated to advantage in Figure 3 of the drawings, the rod 33 will then move the head 39 inwardly and slide the rod 41 inwardl against the tension of the'coil spring 45 an swing the keeper 47 in a manner to engage the same with the upper end of the lever 20 and in this manner retain the valve 12 in open position. Should the flames from the burner 2 be extinguished, the mercury in the tube 31 will cool and contract and thus the coil spring 45 will be permited to shift the rod 41'in a manner to disengage the keeper 47 from the retaining lever 20 and the coil sprin 18 will then move the valve 12 to close position on the seat 11 and the supply of gas to the burner is thus cut off.

It will thus be seen that I have provided an automatic gas cut ofl whereby the passa e of the gas to the burner is permitted on y when the burner is functioning properl or when the valve is manually maintaine in open position. The substantially spherical knob or handle 52 will effectively prevent the valve from being maintained in open posi-' tion by extraneous means by persons who may wish to commit suicide. It is further understood that one of the thermal elements 26 is to be operatively associated with each of the burners on the gas range and the head 40 on the rod 41 is engageable with the head 39 of the actuating rod 33 of all of said thermal devices for actuation thereby.

It is believed that the many advantages of an automatic gas cut oil constructed 1n ac- 5 cordance with this invention will be readily understood, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the details, of construction may be had' which will fall within the scope of the invention as claimed. I k

What is claimed is An automatic gas out 01f for burners com- .prising a casing, a gas chamber mounted on the casing having an outlet port and an inlet port provided with a valve seat, a valve disposed in the chamber and engageable on the seat to close the inlet port, a rod extending slidably into the chamber from the casing and upon which the valve is mounted, a spring engaged with the rod to yieldingly maintain the valve in closed position, manually operable means for retaining the valve in open position comprising a retaining lever mount- 5 ed for swinging movement in the casing and operatively connected to the rod, an actuating handle located exteriorly of the casing and connected to the lever for manually swinging the same, a keeper mounted for swinging movement in the casing and engageable with the retaining lever to maintain the same in operative position, thermally actuated means for shifting the keeper to permit the spring to release the same, said means comprising a body member, said body member having a cylinder formed therein, a passage extending longitudinally therethrough and communicating with'the inner end of t 9 cylinder, a mercury filled tube closed at one 40 end mounted on the body member and communicating with the c linderto permit the passage of the mercury rom the container into said cylinder, means for mounting the body member and the container above 5 the burner in the path of the flames therevfrom, a piston mounted for reciprocatory movement in the cylinder, a housing communicating with thel-passage in the body member and the interior of the, casing, a rod mounted for sliding movement through the housing and havin one end extending into the cylinder and xed to the piston therein, a head fixed on the opposite end of the rod and mounted for sliding movement in the casing, a spring controlled rod mounted for sliding movement in the casin and having a head thereon engageable wit the said head for actuation thereby, said spring controlled rod being operatively connected to the keeper.

In testimony whereof I afix m signature.

GEORGE ROS -WATT.

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