US2116830A - Automatic oven lighter - Google Patents

Description

y 0, 1938. P. 1. HOLLMAN ET AL 2,116,830

AUTOMATIC OVEN LIGHTER Original Filed Nov. 1, 1929 iii' Patented May 10, 1938 AUTOMATIC OVEN mama Peter I. Hollman and Stanley H. Hobson, Blockford, Ill., assignors, by mesne assignments, to

The Cleveland Trust Company, (fleveland, Ohio, a corporation of Ohio Application'November 1, 1929, 801'!!! No. 404,18

' Renewed mm 2, 1937 8 Claims. (Cl. 153-115) This invention relates to an automatic oven lighter and is an improvement upon that type claimed in the application of Frank A. Gauger, Serial No. 332,896,'filed January 16, 1929.

Automaticlighters have been applied to gas stoves for several years operating on the flashback' principle that is described, for example, in Methudy Patent No. 1,675,899, issued July 3, 1928, according to which principle, when the gas for a burner is turned on, some gas is conducted through a tube to a pilot light where it is ignited to be pretty long, and when the oven burner was turned on it took too much time for the gas to flow through this tube to the lighter and flash back, the oven being almost fllled with gas in the meantime so that there was a perceptible puff upon ignition of the ovenburner. In the case of stoves equipped with oven regulators, the amount of gassupplied to the tube from the oven burner obviously depended on the setting of the regulator, and at low temperature settings there was apt to be insufficient gas supplied to the tube extending. to the lighter for a flash-back to occur, and, consequently, ignition was very uncertain, and here again, the fact that the lighter tube had to be so long was, of course, a factor that contributed to unsatisfactory ignition. It

is, therefore, the principal object of our invention to provide an automatic oven lighter which is notonly quicker in its action, so as to eliminate the objectionable pumng, but is, moreover, absolutely positive in its operation under all conditions and not affected in its operation by the amount of gas supplied to the oven burner itself, so as to be operable just as definitely when the oven burner is turned on part way as when it is turned on all way.

According to our invention, an intermediate burner is provided between the ovenburner and the lighter, having a tube extending therefrom to the lighter, said burner being arranged to have gas supplied thereto when thev oven cock is open, and being arranged to'be lit just as easily and quickly as a cooking top burner, and arranged, in turn, to light the oven burner. The intermediate burner is made very small and con- "lit that there will be no question as to the lightsumes very little gas, and serves as a pilot light for the oven burner, arranged to ignite said burner in the event the oven regulator cuts down the flow of gas to the burner to a point where the same is apt to be extinguished. It is also preferred to have the intermediate burner project part way from the side wall of the oven where the flame thereof will be visible from in front of the stove,

so that one can be certain when this burner is ing of the oven burner.

The invention is illustrated in the accompanying drawing, in which- Figure 1 is a phantom view of a gas stove showing the oven burner thereof provided with an automatic lighter in accordance with our invention;

Fig. 'zis an enlarged longitudinal vertical section on the line 2-4 of Fig. 1;

Fig. 3 is a transverse vertical sectional detail on the line 3-3 of Fig. 2;

Fig. 4 isan enlarged sectional detail through the valve controlling the flow of gas to the automatic oven lighter, and

Fig. 5 is a view similar to Fig. 3 showing a modifled or alternative construction.

The'same reference numerals are applied to corresponding parts throughout the views.

Referring to Fig. 1, the stove illustrated has the usual cooking top 5 next to the oven section 6. None of the cooking top burners is shown, but the oven burner appears at I. The manifold 8 has the oven cock Q connected to the underside thereof and communicating with the burner I through an oven regulator it in any suitable or preferred manner. We show an elbow H connected to the cock 9 and communicating with the pipe I! leading up to the regulator "Land another pipe I! extending downwardly from the regulator to the usual mixer It provided on the inlet end of the oven burner. I5 is the thermostat of the regulator Ill, and I6 is the control lever, the setting of which determines the temperature maintained in the oven in the usual way, that is, the thermostat causes the closing of the valve of the regulator more or less when the temperature reaches a predetermined high point, and opens the valve of the regulator more or less when the 'back to the burner to ignite the latter.

' the cooking top burners is turned on, gas issuing from a; port on the burner flows through. the tube l8 to the pilot light and ignites, causing a flash- There was no difliculty in the automatic ignition of the cooking top burners, owing to the proximity of these burners with the igniter. The tubes -l8 could, therefore, be fairly short and it took little time for the gas to reach the igniter from the burner for the flash-back to occur. However,

the attempt to light the oven'burner with a simple tube has least not generally not proved practical or at satisfactory. In the case of the ordinary stove, it took too long for the gas to flow through thelong tube from the oven. burner "all the way to the igniter, and by the.

time the fiash-back-occurred, the oven was usually partly or nearly filled with gas and the resultwas that a loud puif would be heard when the burner was ignited. In case the broiler door happened to be open, flame would be thrown from the stove at the moment of ignition, which, of course, was more or less objectionable. Stoves equipped with oven regulators presented a still further difliculty in that the flow of the gas to the burner was apt to be cut down by the regulator to such an extent that insufficient gas would be delivered to the tube for a flash-back to occur, and consequently, the ignition was rendered very uncertain. The automatic oven lighter 23 madein accordance with our invention is designed to avoid the objections noted and make the automatic ignition of the oven burner just as quick and certainas the ignition of the cooking top burners.

The automatic oven'lighter 23 consists of an elongated cast iron burner 24 extending into the oven 6 to a point immediately alongside the oven burner I, through a hole 25 in a cast iron ring 26 arranged to .be suitably secured on the oven wall as by means of screws 21. The hole 25 is oblong as shown in Fig. 3, and the burner 24 flts in the upper portion thereof and is fastened in such position by means of a lug 28 cast integral therewith which has a screw 29 passed through a hole therein and threaded in a lug 30 cast inte- 32 has connection with the elbow through a control valve 34. Adjustment of the screw 35 on said valve determines the'amount of gas delivered to the automatic lighter 23. A tube 36 extends from the outer end'of the burner 24 to the automatic igniter H. The tube is preferably fastened rigidly to the endof the burner 24 in a collar por ion 31 cast integral with-the end of the burner. The tube has this end spaced slightly from the end of the burner so that when gas is injected therein from a port 38 provided in the end wall of the burner, air is entrained with it to form a combustible mixture. The other end of the tube has a sliding flt in a burner.

H 2,116,830 referred to above, and is suitably disposed in the neck .39 preferably cast integral with the body IS.

The burner 24, instead of being disposed in the upper portion of thehole 25 and having the slot 3| on the underside thereof, may be disposed in the lower part of the opening 25 withthe longitudinal slot 3| on the upper side thereof, as shownin Fig. 5. This arrangement, as a matter offact; presents'certain slightfadvantages over the other arrangement. For example, it is thought it facilitates the lighting of the burner by the flash-back, owing to the fact that the gas flowing through the slot 3| rises in one heavy stream instead of being possibly divided into two streams. Furthermore, the flame from the burner is more easily visible with the burner disposed in this position.

vIn operation, when the oven cock 9 is opened,

gasv isdeliv'ere'd to the burner 24, and a certain amount of this gas issues from the port 38 and is conducted along with air entrained therewith through the tube36 to the pilot light 2|! for ignition, A flash back occurs, resulting in the ignition of the burner 24 the full length of the" slot 3|, and the oven burner I isignited froin the burner 24, theinner. end of the-latt 'r" being close to the side of the oven burner; besure to ignite the gas issuing from'th 'ports provided in the underside of said burne jThe fact that there is such ashort line of communication between the burner 24 and the 'ovenjcock 9 as compared with the line of communication between the oven burner] and the oven cock, makes it reasonably certain that, even allowing for the slight delay. for the automatic ignition of the burner 24, the burner 24 will be ignited before any gas has issued from the oven burner and the latter will, therefore. be ignited asjsoon as enough gas issues therefrom. It is well-known that the regulator I0 is set for any desired 'oven temperature, and that the oven .cock 9 is always opened fully as a matter of course; Hence, it is easy to understand that theburner'24 .will always have a definite amount of gasssuppli'ed thereto irrespective of the amount of gas supplied to the oven burner. The automatic ignition is, in other by the amount of gas l supplied to the oven burnen. The oven burner is usuwords', unaifected ally ignited practically as quickly asany cooking top burner because there is no perceptible delay in the ignition of the oven burner from the burner 24, and the latter, it is evident, is ignited just as quickly as afcooking topburner. The burner 24 will obviously always maintain the same sized flame, regardless of the control of the oven burner by the regulator I, so that it is arranged to'serve as a pilot lightfor the oven When the regulator ||l cuts f down the flow of gas to the oven burner, the flame is frequently brought so low that-it is extinguished, and a pilot light for igniting the same again when the flow of gas to the burner is resumed,'is, therefore, a necessity. Ordinarily a special pilot light had to be provided for the oven burner, but

that is made unnecessary where our invention is used, so that a certain saving is effected. The fact that the burner 24 extends from the oven a certain amount is an advantage from the standpoint that one can always see the'flame of this burner from in front of the stove and in that,

charge of gas regardlessof the setting 0!. the oven regulator and. inany event, should the intermediate burner be extinguished. it will be reignited by gas discharging through the port 88.

covering all of the features described in terms 7 broadly enough to afford protection on all legiti-- mate modifications and adaptations, such as will no doubt occur to those skilled in the art as a result of this disclosure.

We claim:

1. In a gas stove, an automatic oven burner lighter comprising, a constantly burning pilot remote from the oven, a pilot burner in proximity to the oven burner for directly igniting the same, means for supplying gas to the oven burner controlled by a valve, means for charging the oven pilot burner with gasby opening movement of said valve and continuing said charge so long as said valve remains open, means for supplying primary air to the gas being delivered to said oven pilot burner, and a flash-back conduit between said remote pilot burner, and said oven pilot burner adapted to be charged with a mixture of gas and air delivered Irom'said oven pilot burner, whereby said oven pilot burner will be ignited by flash-back from the remote'pilot and will in turn ignite the oven burner, and whereby said oven pilot burner continues to burn so long as the oven burner is being supplied with gas and will automatically re-ignite the oven burner in the event said oven burner is extinguished by gas pressure drop or by accident. V

2. In a gas stove, anautomatic oven burner lighter comprising, a' constantly burning pilot remote from the oven, a pilot burner in proximity to the oven burner for directly igniting the same, means for supplying gas to the oven burner controlled by a valve, means for charging the oven pilot burner with gas by opening movement of said valve and continuing said charge so long as said valve remains open, means for supplying primary air to the gas being delivered to said oven pilot burner, and a flash -back conduit between said remote pilot burner and said oven pilot burner adapted to be charged at its end remote from the constantly burning pilot with a mixture of gas and air delivered from said oven pilot burner, whereby said oven pilot burner will be ignited by flash-back from the remote pilot and will in turn ignite the oven burner, and whereby said oven pilot burner continues to burn so long as the oven burner is being supplied with gas and will automatically re-ignite itself as well as the oven burner in the event either or both said burners is extinguished by gas pressure drop or by accident. v

3. In a gas stove, an automatic oven burner lighter comprising, a constantly burning pilot light remote from the oven, an oven pilot burner in such proximity to the oven burner that gas issuing from the oven burner will be directly ignited by the flame of the oven pilot burner, and a flash-back conduit for lighting the oven pilot burner by propagation of flame in said conduit ignited by said constantly burning remote pilot light, the oven pilot burner being continuously supplied with gas at all times while gas is supplied to the oven burner, whereby said oven pilot burner remains constantly burning for reigniting the oven burner should the latter be extinguished. l 4. ,In a gas stove, an automatic oven burner lighter comprising, a constantly burning pilot light remote irom the oven, an oven pilot burner in such proximity to the oven burner that gas issuing from the oven burner will be directly ignited by the flame of the oven pilot burner, and a flash-back conduit for lighting the oven pilot burner by propagation of flame in said conduit ignited by said constantly burning remote pilot light, the oven pilot burner being a Bunsen burner having an orifice supplied with a combustible mixture of gas and air, said ovenpilot burner orifice being arranged to deliver said inix-' ture into the end oi. said flash-back conduit remote from the constantly burning pilot.

5. In a gas stove, an automatic oven burner lighter comprising, a constantly burning pilot remote from the oven, a pilot burner in proximity to the oven burner for directly igniting the same, means for supplying gas to the oven burner controlled by a valve, an oven regulator interposed in said gas supply means between said valve and the oven burner for regulating the temperature of the oven, means for charging the oven pilot burner with gas by opening movement of said valve and continuing said charge so long as said valve remains open, means for supplying primary air to the gas being delivered to said oven pilot burner, and a flash-back conduit between said remote pilot burner and said oven pilot burner adapted to, be charged with a mixture of gas and air delivered from said oven pilot .burner, whereby said oven pilot burner will be ignited by flash-back from the remote pilot and will in turn ignite the oven burner, and whereby said oven pilot burner continues to burn so long as the oven burner is being supplied with gas and will automatically re-ignite the oven burner in the event said oven burner is extinguished by gas pressure drop or by-accident.

6. An oven lighter comprising an elongated burn'er arranged to be mounted in the side wall of an oven of a gas stove so as to project into proximity with the oven burner, means whereby said burner is supported in the side wall of the oven, the outer end of said burner having a port provided therein, a flash-back tube extending from this end of the burner and so disposed relative thereto to have gas delivered thereto from said port along with air entrained therewith, said tube being arranged to have communication at its other end with a pilot light for automatic ignition purposes, and means for supplying gas to said burner. f

7. In a gas stove, in combination, an oven compartment having an oven burner, a pilot light remote from the oven compartment, a burner in the oven compartment in proximity to the oven burner for lighting the same, a Bunsen mixer for supplying a mixture of gas and air to said lighting burner, a flash tube extending from said remote pilot light to a point in proximity to said lighting burner, said lighting burner having a port for discharging gas into the adjacent end i flash-back tube extendilig from said remote pilot I of said burner compartment and serving-to e11 light toapoint in proximitytosaidiightingburner train air into the-flash tube from an; area u fo 'iiighti ng the lighter, means for supplying gas affected by the heat and cii culation effects oi the -toj theflrstgnientioned-burner and to the lighting burner compartment.

5 burner, and means whereby gas from the lighting s burner is chargedfl'nto' the adjacent end of the PETER. I. HOLLM AN. flash-backtube, said means being located outside v STANLEY H. -HOBSON.

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