US741498A - Automatic gas cut-off. - Google Patents

Description

'PATBNTED 00T. 13, 1903. T. R. JENKINS", JR. E u. BBERT.

AUTOMATIC GAS GUT-OPF.

PPLIUATION FILED PEB. 4, 1903.

j@ is N0 MODEL.

To a/ZZ whom it may concern/.-

l UNITED 'STATES IPatented October 13, 1903;;

PATENT GEFIOE.

THOMAS ROBERT JENKINS, JR., AND JAOOB EBERT, OE BALTIMORE,

' MARYLAND.

AUTOMATICv GAS c uT-OFF.

sPEcIEIcATroN forming part of Lettersrtent No.f741,498, dated october 13, 1903.

' Appncaeon mea February 4l 1903. serai No. 141.845. ci@ man.;

Be it known that we, THOMAS ROBERT J EN- KINS, Jr., and JACOB EBERT, citizens of the United States, residing at Baltimoretate of Maryland, have invented 'certain new and useful Improvements in Automatic Gras Cut- Offs, of which the following is aspecification.

This invention relates to a device for automatically cutting oif the liow of gas from burners in case the flame is accidentally eX- tinguished or blown out. A

This invention consists in the construction and combination of the partsfas willbe hereinafter described and claimed.

In the drawings, Figure 1 illustratesaside elevation of the device, the parts being inl Referring to the'drawin gs by letters, a des ignates a portion of a gas-bracket of any suitable style or construction,to which is suitably vsecured a valve-casing b. vThekey b of 'this valve is operated by a lever b?, which latter is provided with a weight b3. The lever b2 is also provided with a laterally-projecting lug b, which has position on the side of said lever between the weight andfkey. When the lever is elevated, as shown in Figs. 1 and 2, the valve-key in the valve-casing is turned so as to permit the gas to pass through to the burner, and when the lever is in the vertical position (indicated by broken lines in Fig. 2) the flow of gas is cut off. Th'e valve-casing is provided with a neck, which projects vertically above the'casing.

Abracket c has a bottom ange c', provided with an opening (not shown) which takes over` the neck of the valve-casing and supports the bracket thereon. V.This bracket is 'substantially U shaped and is provided with two verticallyfprojecting arms c2 and c3.

The arm c2 is straight, while the arm c3 is bent atdand makes a quarter-turn, and the upper en d of this arm c3 is turned Overandbent backward and forms a bifurcated or forked bearing d. Each ofthe arms czand c8 is pro- ;vidediwith aseries of perforations d2 fora purpose to be hereinafter described.

On the top of the ange o is a washer e of some suitable material which isa poor conductor of heat, and an ordinary gas-burner le', having a tip e?, screws down onto the neck "of the valve-casing and is seated on the nonconducting washer e..

The object in interposing the'washer between the flange c and the burner e is to check the flow of heat from the burner to the bracket and prevent eX- -pansion ofthe latter by heating the met-al.

The perforations d2 are provided in the. larms c2 and c3 for the purpose of ventilation and preventing the heat from expanding the Pivoted to the upperpend of the arm c2 is a llever g, and the upper end of said lever is provided with a slot gf., This lever g hangs pendent from its pivot g2, and about midway of its length is provided with an outward bend or offset g3, the purpose of which is to separate the lever` from thearm c2 and prevent the same from being heated by contact with the arm and bracket c belo'wthe perfop rations d2.

The lower end of ,thelever g. is provided `with an inturned hook h, having'a curved edge h', (shown bybroken lines in Fig. 1,) and `this hook h is adapted,V under certain conditions to be presently pointed out, to engage the laterally-projecting lug b4 on the weighted lever b2 and hold said lever elevated and the valve open for the gas to escape for the purpose of light. Y

A metallic bar 1l has a hook t" at one end and a threaded portion 2 at its opposite end, and said bar is also provided between said two ends with alongitudinal groove 3.

bar between said ends and through said groove is substantially U -shaped in cross-sec- I tion and is provided with a plurality of perforations or holes j. The hook on the end of this horizontal bar extends through the slot g' of the lever g, while the threaded end i2 of This.r

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said bar passes loosely through holes in the bifurcated portion or bearing d' of the arm c3, and a thumb-nut k, having position in said bearing, serves for adjusting the bar longitudinally. It will thus be seen that the bar i is supported in proximity to the tip e2 of the gas-burner and will be heated without obstructing the light.

The operation of the device is as follows: The thumb-nut la is turned to move the bar ilongitudinally, and thereby adjust the inclination of the pendent lever g, so that the hook 71. on its lower end will be close tov but not touch the lug b4 on the valve-lever h2 when the latter is raised. With this adjustment made the device is ready for use, and the usual key (not shown) to the gasbracket may then be turned to permit the gas to flow to the valve-casing b. The valve-lever b2 :is now raised and the gas permitted to flow to the tip e2, where it is immediately lighted. The llame from the tip will now heat the bar t' and will pass into the groove i3, and thereby a large percentage of the surface of the bar will be acted upon and cause the bar to expand longitudinally and throw the hook h of the lever g beneath the lug b4 on the valvelever b and hold the latter in the elevated position and permit the gas to continue flowing. All this is accomplished in a few seconds. When the gas is burning, the heat will aifect the arms c2 and c3 and also the lever g. It is therefore advantageous to conduct the heat Off and prevent the lower cross-bar of said bracket and the flange c' from becoming heated and expanding, and thereby move the arms c2 and c3 in a line parallel with the line of expansion of the bar z'. The hook h in its adjustment should have a delicate or slight contact with the lugvbt, so that in case the flame should be extinguished accidentally the bar t will contract enough to disengage the hook h from said lug and permit the Valvelever b2 to drop and cut 0E the iow of gas. As the heat is conducted down the burner e the same will be checked by the insulatingwasher e, and the perforations d2 will serve to carry the heat off as it is conducted down the arms c2 and c3. The groove 3 and perforationsj in the bart' serve to ventilate said bar after the flame has been extinguished and rapidly cool and cause the same to contract and thereby quickly release the bar b2.

The bell-crank lever f, by virtue of its weight f', serves to take up any lost motion that might exist between the slot g' of the lever g and the hook c" of the expansion-bart' and also serves to release the hook h from the Valve-lever lug h2, for the reason that the arm f2 of said weighted lever always presses against the lower end of the bar g and tends to disengage its hook h from the valve-lever lug b2.

By our construction and arrangement it will be seen that the entire flame from the tip e2 will project above all of the mechanism, and thereby avoid casting shadows.

Having thus fully described ourinvention, whatwe claim as new, and desire to secure by Letters Patent, isj l. The combination of a gas-supply pipe; a valve having an operating -lever provided with a laterally-projecting lug; a burner; a bracket having a bottom fiange by which it is secured below said burner; a lever pivoted at its upper end to said bracket and hanging pendent therefrom and at its lower end provided with a hook which is adapted to engage the lug on the valve-lever to hold the latter elevated, and a bar extending at right angles to said burner and in a direction parallel with the fiange on said bracket, said bar being supported at one end by saidv bracket and at its other end engaging the upper end of said pendent lever.

2. The combination of agas-supply pipe; a valve having a lever; a burner above the valve; means for keeping the valve normally closed; a bracket having a bottom liange by which it is secured below said burner, said bracket also having two arms which project in a direction parallel with said burner and one of said arms having a bifurcated end; a lever pivoted to one of said arms and hanging pendent therefrom and at its lower end having a hook which engages the valve-lever to hold the latter in an elevated position, and a bar having an adjusting-nut which takes in the bifnrcated end of said arm, said bar extending from one arm to the lever and attached to the latter and being in close proximity to said burner for the purpose set forth.

3. The combination of a gas-supply pipe; a valve having an operating -lever provided with a laterally-projecting lug; a U-shaped bracket having two vertically projecting arms, one of which is provided with a bifurcated end; a lever pivoted to one of said arms and at its lower end provided with a hook which takes beneath the lug on the valve-lever and a bar secured at one end to said pivoted lever and the other end of said bar passing through the bifurcated end of said arm.

4.. The combination of a gas-supply pipe; a valve having an operating-lever; a U-shaped bracket having two vertically projecting arms; a lever pivoted to one of said arms and at its lower end having a device which engages the operating-lever of said valve to hold the latter open; a bell-crank lever pivoted to said bracket and contacting with said pivoted lever between the ends of the latter and a bar secured atone end to the upper end of said pivoted lever and at its other end said bar being supported by an arm of said bracket.

5. The combination of a gas-supply pipe; a valve having an operating-lever which latter is provided with a laterally-projecting lug; aburnerabove thevalve; a U-shapedbracket having a bottom flange by which it is secured below said burner, said bracket having two vertically-projecting arms each of which is provided with a plurality of perforations; a

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non-heat-conducting washer interposed between the burner and the flange of said bracket; a lever pivoted to one of said arms and having a hook at its lower end to engage the lug on the valve-lever and a bar secured to the upper end of said pivoted lever and extending in a horizontal direction and in close proximity to said burner and secured at its other end to said bracket-arm.

6. The combination of a gas-supply pipe; a valve having a lever; a burner above the valve; means for keeping the valve normally closed and the gas out 0R; a bracket; ale-

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