US1232036A - Gas lighting and extinguishing apparatus. - Google Patents

Description

G. C. INNIS.

GAS LIGHTING AND EXTINGUISHING APPARATUS. APPLICATION FILED JAN-4,1913

1Q39,36 Patented July 3, 1917.

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G. c. mms. GAS LIGHTING AND EXTINGU I SHING APPARATUS. APPLICATION FILED JAN-4.1913.

LQQNW. Patented July 3, 1917.

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\MT AEEE A ,I WE JTDP GEGRGE C. INNI$, 0F BOSTON, MASSACHUSETTS,

ASSIGNOR '10 PHIL C. STINGEL, OF

'VVEST MEDFORID, MASSACHUSETTS.

GAS LIGHTING AND EXTINGUISHING APPARATUS.

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Application filed January 4, 1913.

To all whom it may concern:

Be it known that I, GEORGE C. INNIS, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, have invented a new and useful Improvement in Gas Lighting and Extinguishing Apparatus, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in eX- plaining its nature.

My invention relates to a gas lighting and extinguishing apparatus having a gas cock or valvular control for turning the gas on and off operated'by a motor controlled by stop and timing mechanisms in such manner that upon the application of some moving or actuating force the motor may operate to turn the gas on and off at determinate times.

A nong the objects of my invention are to improve the stop and timing mechanisms controlling the operation of the motor and make the same as accurate and positive in their operations as possible; or, in other words, to provide whereby at all times the motor can only operate to give the valve controlling the gas supply its proper and precise movement; especially to provide whereby the motor will not continue to operate during the continuance of an application of force to the mechanism controlling the motor for releasing the same to operate and move the valve, owing to the fact that such application of force may var in the length or period of its application, but to provide whereby upon the application of such actuating force the mechanism controlling the motor will be released and permit the motor to operate and move the valve only at some precise instant of time and from which instant the motor will operate to move the valve for a proper and precise movement; to provide an improved type of valvular control whereby for one operation of the valve the gas from the main gas supply may first be admitted to a pilot burner and ignited, then to the main burner and ignited from the pilot burner whereupon the supply of gas to the pilot burner will become shut off, afterward upon the next successive movement of the valve the will become entirely shut off from both burners; and to provide also an improved and positive means by which the pilot burner may become lighted automatically Specification of Letters Yatent.

Patented Jniy 3, 1917. Serial No. 740,123.

from power developed by the motor after the gas has become admitted thereto as aforesaid.

My invention can best be seen and understood by reference to the drawings, in ca which- Figure 1 is a side elevation of an apparatus embodying my invention.

Fig. 2 shows the apparatus partly in rear elevation and partly in longitudinal vertical section.

Fig. 3 is a front end elevation of a portion of the apparatus.

Fig. i is an elevation of a section of the apparatus especially designed to show the no means employed for igniting the pilot burner.

Figs. 5 and 6 are sectional gas cock or valvular control.

Fig. 7 is a plan of the valve forming a portion of the gas cock and designed especially to show the general construction thereof. 7 i

Fig. 8 is a cross section of an element of construction to which special reference will later be made.

Fig. 9 is an end elevation of the same element.

In the drawings 1 represents the main burner which is preferably the usual form of mantle burner. 2 is the pilot burner. Leading to the main burner from a block or fixture 3 is a pipe 4. The pilot burner consists in itself of a pipe connecting with the same fixture or block. Connecting also with the fixture 3 is a main gas inlet pipe 5.

The fixture or block 3 forms with a valve 6, cooperating therewith, gas cock. From the main gas inlet pipe 5 gas is either shut 95 off entirely from the main and pilot burners or admitted to both of these burners or to one burner or the other depending upon the position of the valve. The construction of these parts controlling the supply of gas can best be understood by an understanding of the function or series of operations performed by them. In the first instance, as suming the gas to be entirely shut oil from both the main and pilot burners, the first operation of the valve is to admit gas to the pilot burner, which at once becomes automatically lighted by mechanism to which reference will later be made. After the admission of gas to the pilot burner and at details of the about the instant of the lighting thereof the further turning of the valve admits gas to the main burner which becomes lighted from the pilot burner. After the main burner has become lighted the further turning of the valve shuts pilot burner and the pilot light goes out, leaving the main burner lighted. This completes one movement of the valve 6 and is effected by moving the valve one quarter turn.

The next movement of the valve takes place after a predetermined interval of time and consists in continuing the movement of the valve one quarter turn which operates to shut off the gas from the main burner, the gas continuing to be shut off from the pilot burner.

The next movement or quarter turn of the valve is one which operates to admit gas to the burners in the manner first above described and the operation is continued the same as before.

These operations are effected in part by reason of the peculiar formation of the valve 6 and the manner in which it cooperates with the block or fixture 3, the face or side 7 of which forms a seat for the valve. Formed in the block and extending to its side or face 7 are a number of passages of which 8 is a relatively large passagewith which the main gas inlet pipe 5 connects. 9 is a passage extending from the face of the block and connecting with the pipe 4 leading to the main burner, and 10 is a passage extending from the face of the block and connecting with the pipe 2 forming the pilot burner (see Figs. t and 5).

The valve 6 consists of a disk presenting a bearing face 11 (see Fig. 7) which bears against the side or face 7 of the block forming a valve seat as aforesaid. The valve is secured to the block whereby it may turn thereon by means of a screw 12, a bow spring 13 being inserted between the outer side of the valve and the head of the screw by which the valve may be held tight upon its valve seat. The valve is further provided on its interior side with a central circular opening or cavity 1i into which extends a projection 15 from the side of the block, which assists in the support and centering of the valve thereon. The seating face of the valve is also journaled and re cessed to provide winged openings or cavities 17 arranged diametrically opposite one another and connected by channels 18 which extend around the centralopening 14 formed in the valve, and are separated therefrom by an annular ring or bead 19 which forms a part of the seating face 11v of the valve. The seating face 11 of the valve operates to cover or uncover the passages S, 9 and 10 in the valve seat depending upon the turned position of the off the gas from the the main gas inlet pipe sage 8, around openings 18 into the passage valve. In this connection it is to be observed by reference to Fig. f that the openings 8 with which the main gas inlet pipe 5 connects, are arranged upon one side of the valve seat and the openings 9 and 10 which connect with the respective burners, are arranged on the other side of the valve seat diametrically opposite the passage 8. The passage 9 connecting with the main burner is also arranged just in front or forward of the passage 10 connecting with the pilot burner.

With the parts thus constructed and ar ranged, the valve may be turned to a position where that portion of the face 11 thereof lying between the winged openings 17 will cover all of the passages 8, 9 and 10 in the block. Upon turning the valve slightly, however, the passage 10 connecting with the pilot burner will become uncovered by one of the winged openings and at the same time the passage 8 connecting with the main gas inlet pipe 5 will be uncovered by the opposite one of the winged openings 17. Thereupon gas will pass from 5 through the pasby way of the channeled 10 and to the pilot burner. Upon a slight further turning of the valve the passage 9 connecting with the main burner will become uncovered, when gas will be admitted to both passages 9 and 10 from the passage 8 and main gas inlet pipe. Upon a slight further turning of the valve the passage 10 will become covered by the bearing surface 11 of the valve and the gas shut off from the pilot burner, continuing, however, to pass to the main burner, which completes one of the operations as above described,

and is accomplished by a quarter turn of the valve.

Upon now turning the valve a further quarter turn in the same direction all the passages will be covered by the seating surface 11 of the valve which completes the next operation of the valve.

These movements of the valve are effected mechanically by a motor consisting of a coiled spring 20. In order that the force developed by the motor may operate the valve to have the defined movements before described, and in order also that these movements of the valve may take-place only at predetermined periods or intervals of time, an operating mechanism is provided all of which together with the spring is contained within the casing 21. The spring 20 is arranged upon a shaft 22 mounted to turn within. the casing'and is also contained within a drum 23 located within the casing. The shaft 22 extends through the center of this drum which is loosely arranged upon the shaft so that it may turn thereon. The inner end of the spring is pinion 30 so as fixed to the shaft 22, the outer end to the drum. The parts are thus arranged for the reason that the spring operates not only the valve and controlling mechanisms but also a clock mechanism to which reference will later be made and the purport thereof described. Inasmuch as the drum turns very slowly for operating the clock mechanism (Which restrains the spring), it is practically a fixture for retaining the outer end of the spring.

For winding the spring there is employed the usual winged nut 24; For taking up and holding the spring when wound and for transmitting the force developed by 1t to the valve 6 and its various controlling mechanisms, there is fixed to the shaft 22 a ratchet wheel 25 which is engaged by a pawl 26 pivoted to a large gear wheel 27 loosely mounted upon the shaft 22. The gear wheel 27 engages a pinion 30 fixed to a shaft 31 suitcbly mounted to turn within the casing.

Having operative engagement with the to be turned by it, is the valve 6 of the gas cock, the peripheral edge of the valve for this purpose being provided with teeth.

Fixed to the shaft 31 is a gear 32. This gear is in operative engagement with a pinion 33 fixed to a shaft 34: suitably mounted within the casing. Fixed to the shaft 84: is a gear wheel 35 in operative engagement with a pinion 36 fixed to a shaft 37 suitably mounted within the casing. Fixed to the shaft 37 is a gear wheel 38. Engaging the gear wheel 38 is a pinion 39 fixed to a shaft 40 suitably mounted within the casing and which carries a fan regulator 41, which, through the chain of connecting gears and pinions, operates to curb or control the action of the spring as it isallowed to become unwound.

Referring now to the stop and timing mechanisms for the motor in its relation to the valve 6, attention is first directed to the gear 38 in the chain of gears. Projecting from the side of this gear just adjacent theperipheral edge thereof is a pin forming a stop. Arranged to engage this pin for stopping the rotation of the gear 38 and likewise that of the entire connecting mechanism, is a bent arm 46. This arm projects from a hub 47 fixed to a rock shaft 48 suitably arranged to turn within the casing, the disposition of the parts being such that the arm 46 by the turning of the rock shaft may be moved into or out of the path of the pin 45.

The arm 46 is so controlled that it will engage the stop 45 or become released thererom only at a predetermined time and when released will permit only of a determinate movement of the operating mechanism, or that commensurate with a quarter turn of the valve 6, when the arm will again reengage the stop. This is provided for by means of a timing wheel 5 This wheel is fixed to the shaft 31. Formed in the peripheral edge of the wheel is a slot 51. Co operating with this wheel is an arm 52 the bent end of which is adapted either to bear against the peripheral edge of the wheel or be contained in the slot 51 formed therein. The arm is fixed to the hub f? to which the arm 46 is secured, the two arms being angularly arranged and with such other disposition and arrangement that the arm 52 will permit the arm lG to engage the stop only when the end 53 of the arm is contained within the slot 51, the arm a6 being held out of the path of the stop when the arm is bearing against the peripheral edge 55 of the timing wheel.

The end 53 of the arm 52 is held in normal-engagement with the edge of the timing wheel and so that therein by means of a spring 56. The normal action of this spring, to throw the end of the arm 52 into the slot in the timing wheel during the operation of the machine, thereby permitting the arm do to engage the pin is and stop the machine. The arm 52 is lifted out of the slot 51 in the timing wheel for disengaging the arm 46 from the stop by an arm 57 fixed to project from the hub 47 and provided with a turned end 58. The disposition and arrangement of this arm is such that tion of force thereto through a suitable tripping mechanism, lever tending to turn the hub at? and more the arms 46 and 52 into an inoperative or disengaging position as aforesaid. Force is applied to the arm 57 for turning it by an arm 59. This arm projects from a blo k (30 rigidly secured to arock shaft 61 suitably mounted to turn within the casing. he disposition and arrangement of this rock shaft are such as to permit by of the shaft the arm 59 to turn 011 the arc of a circle and engage the turned end 58 of the arm 57 and thereupon, by bearing against the same, operate the arm 57 to move the arms 4:6 and 52 into a disengaging position. The arm 59 is controlled by a spring 62 to have a normal disengaging position with respect to the arm 57, this spring, however, permitting of the operation of the arm as aforesaid.

The arm 59 is turned to engage the arm 57 for moving the arms 46 and 52 into a disengaging position at determinate times and any suitable means may be employed for imparting such movement.

In the present embodiment of my invention I have employed for the purpose common clock works 64 run by the spring 20, motion being applied to the works through a gear 65 fixed to the drum 28 and which the rocking engages a pinion 67 suitably mounted within the casing. The clock works 64 operate hands 68 and 69, respectively, each carrying a projecting pin 70. The hands 68 and 69 turn over a face or dial 71, which together with the hands 68 and 69 are practically identical with the dial and hands of an ordinary clock, the hands turning in precisely the same time and in like manner as those of a clock.

The rock shaft 61 carrying the arm 59 is arranged to extend forward by the clock works to the front of the casing adjacent the dial 71 of the clock and is there provided with an arm 72 which is angularly bent or turned to normally extend over the dial 71 into the path of the pins so that these pins will engage the arm 7 2 as the hands are turned and will thereby tend to depress the arm to turn the rock shaft 61 (against the tension of the spring 62) and move the arm 59 into engagement with the arm 57. In this connection it is to be observed that the extension and arrangement of the arm 72 is such that as the pin 70 on each hand engages the same, the hand will tend to gradually depress or turn the arm 7 2 by a drawing engagement therewith which continues for a considerable interval of time and is terminated by the pins 70 slipping off the end of the arm when the arm together with the arm 59 will be returned to their angular positions by the spring 62.

The hands 68 and 69 may be so relatively arranged that for one complete revolution thereof or that completed in twenty-four hours, the pin 7 0 on each one of the hands may be made to depress and slip over the end of the arm 7 2 at a determined time when the precise operation will be as follows:-

It will be assumed that either one of the hands 68 or 69 by the running of the clock has been turned to a position where the pin 70 thereon will engage the arm 72. Thereupon the arm will become gradually depressed from its normal position against the tension of the spring 62. As the arm 72 becomes depressed the rock shaft 61 will be turned and move the arm 59 carried thereby gradually toward and into engagement with the arm 57. As the movement continues the arm 57 will move the arm 59 and thereby turn the arm 46 into disengaging position with respect to the stop and move the arm 52 out of the slot in the timing wheel, thereby permitting the motor through the geared connections to turn the valve 6 for controlling the gas supply. The turning of the valve should continue only for such interval of time as is defined by a single revolution of the timing wheel 50 which measures, as it were, a one quarter turn of the valve, the arm 52 being then returned to slip into the slot 51 cut in the timing wheel and permitting the arm 46 to reengage the stop and thereby permit no further movement of the valve for that operation.

The return of the arm 52 and its reentry into the slot 51 in the timing wheel and the reengagement of are only permissible when the arm 59 is returned by the tension spring 62 into its normal position out of engagement with the arm 57 and which takes place as the pins 70 carried by the hands of the clock, slip over and off of the end of the arm 7 2 when this arm together with the arm 59 are returned to their normal positions.

An application of force for working against the arm 7 2 for depressing the same and moving the arms 46 and 52 into disengaging position and holding the same in such position, might continue for an uncertain or variable length of time when the timing wheel might be' allowed to make more than one complete revolution and the motor consequently operate to turn the valve more than one quarter turn, which would disarrange. the entire operation of the device.

I have accordingly provided means whereby the timing wheel may be made to complete a single revolution only after the pin 70 carried by the hands has slipped over the end of the arm 7 2, although by the depression of the arm 72 he arm 52 will have been moved out of the slot in the timing wheel and the arm 46 into disengaging position with respect to the stop. This means consists in an arm 7 5 secured to the block 60 fixed to turn with the rock shaft 61 as aforesaid. This arm is provided with a turned end 7 6 which is adapted to engage a pin 77 on the side of the gear wheel 88 and which provides a stop. The arm occupies, however, a normal disengaging position with respect to the pin 77, the same being held in this position by the spring 62. 11cm, however, the rock shaft 61 is turned by the depression of the arm 72 as aforesaid the arm 75 will be brought into engagement with the pin 77 upon the gear 38 and stop the operation of this gear and connecting mechanism together with any movement of the valve 6 until the arm 52 has been released from the slot in the timing wheel and a slight rotation of this wheel permitted or such amount of rotation that when the arm 52 is allowed. to return to reengage the timing wheel it will not reenter the slot 51, but will engage the peripheral edge 55 of the wheel, thereby preventing the return of the stop arm 46 to engaging position until the timing wheel has completed its revolution when the arm 52 may enter the slot 51 and the stop arm 46 be allowed to return to an engaging position, thereby stopping further operation of the motor for turning the valve 6 until the arm 72 has been again depressed.

the arm 46 with the stop Reference will now be made to the means employed for automatically lighting the gas after its admission to the pilot burner.

Arranged alongside the pilot burner is some suitable substance which when rubbed or subjected to attritive action will produce a spark or flame having suiiicient heat to ignite the gas from the pilot burner. For the purpose of emitting gas in the vicinity of the substance 80 the pilot burner is provided with openings 81 in the side thereof which extend to the top of the burner so that the gas once ignited alongside the burner will extend to the top. For the purpose of rubbing the substance 80 or subjecting the same to attritive action, there is provided a wheel 82 of some hard metal the peripheral edge of which is roughened or provided with teeth. The substance 80 is held against the edge of this wheel. In order that the substance may be held to bear hard against the same it is loosely contained within a casing 83 and subjected to the influence of a spring 84 also contained within the casing and'lying between the bottom of the casing and the rear end of the igniting substance. The effect is that the substance will be yieldingly held to bear at all times against the edge of the wheel. The yielding resistance of the substance 80 is also of importance in the following connection It will be observed by reference to Fig. 4: that the edge of the wheel 82 is indented to provide a series of grooved edge portions 86, each portion gradually increasing in the distance which it lies from the center of the wheel in a direction reverse to that of its turning as indicated by the arrow upon it) and terminating in an abrupt edge portion 87. The wheel is mounted to turn upon a shaft 88 secured in any suitable manner to the fixture supporting the burners and as the wheel 82 is turned the igniting substance 80 will bear in turn against any one of the edge portions 86 with a gradually increasing degree of pressure terminating in an abrupt snap or drop over the edge portion 87 onto the next adjacent edge portion 86, The eflect of this is to materially increase the intensity of the spark or flame de eloped by the substance 80 and one which will in variably ignite the gas issuing from the pilot burner.

The wheel 82 is rotated only such an amount as will effect the operation above noted and which operation is eflected at just the moment that gas is admitted to the pilot burner. The turning of the wheel at the proper time is accomplished in the following manner z- Projecting from the side of the wheel are a series of pins 89 which correspond in number to the edge portions 86 of the wheel. Arranged to draw against and engage each oneof these pins is a dog 90. This dog is pivotally secured to a lever 91 pivoted to a rod 93 suitably mounted within the casing. Interposed between the lever 91 and the dog is a spring 9% which acts to hold the dog against any one of the pins and by which the dog drawing against any one pin may operate to turn the wheel with just the proper movement for igniting the gas as the dog is drawn downwardly, or ride back over the next adjacent pin into engaging position therewith as the dog is returned by a reverse movement thereof. The dog is drawn downwardly and reverse by movement imparted to the lever 91. F or this purpose there is secured to the end of the lever an extension coiled spring 95 the lower end of which is secured to a rod 96 suitably mounted within the casing. Carried by the gear wheel 27 of the gears operated by the motor is a cam of this cam is iii- 97. The peripheral edge dented to provide drawing edge portions 98 each of which gradually increases in the distance which it lies from the center of the cam and gear 27 in a direction reverse to that of its turning (as indicated by the arrow thereon in Fig. l) and terminates in an abrupt edge 99. Having engagement with the indented edge portion of this cam is a beak securely fixed to the side of the lever 91. As the gear 27 is turned by the motor for operating the valve 6 the beak 100 will either draw over one of the edge portions 98 of the cam, thereby operating to lift the lever 91, extend the spring 95 and elevate the dog into engaging position with one of the pins on the wheel 80, or the beak 100 by a further turning of the gear wheel 27 and cam carried by it will draw over the abrupt edge portion 99 of thecam when the spring Wlll operate to draw down the lever 91 and 51 dog carried by it, thereby turning the wheel 80 and lighting the gas.

The cam 97 is indented to provide just such number of edge portions 98 and 99 and the disposition and arrangement of the parts is otherwise such that the cam will operate to lift the lever 91, extend the spring 95 and elevate the dog during that period of operation when the motor is operatin valve 6 to shut off the ga from both burnj;

ers, while the return movement of the parts, viz.,the contraction of the spring and consequent drawing down of the lever 91 and dog 90 carried by it, will be effected at just the time when the motor is operating to turn 1:

the valve 6for admitting gas to the pilot burner.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States 1. In an automatic gas-lighting device having the usual main and pilot burners, the combination comprising a gas cook hav 111 a o I 0 Y b valve controlling the admission of gas to said respective burners by a determinate movement of said valve, the same being arranged whereby gas will be admitted to said pilot burner only afterward to said main burner, and then shut off from said pilot burner, a releasable gas-kindling device, and means whereby said valve may be operated with a determinate movement as aforesaid and said gas-kindling device released simul taneously with the admission of gas to said pilot burner.

2. In an automatic gas-lighting device having the usual main and pilot burners, the combination comprising a gas cook having a valve controlling the admission of gas to said respective burners by a determinate movement of said valve, the same being arranged whereby gas will be admitted to said pilot burner only, afterward to said main burner, and then shut off from said pilot burner, a releasable gas-kindling device, and means having warn and release movements for operating said valve with a proper and determinate movement as aforesaid and for releasing said gas-kindling device simultaneously with the admission of gas to said pilot burner.

3. In an automatic gas-lighting and extinguishing apparatus having the usual main and pilot burners, the combination comprising a gas cock having a valve controlling the admission of gas to said respective burners by successive and determinate movements of said valve, the same being arranged whereby for one movement of said valve gas will be admitted at first to said pilot burner, afterward to said main burner, and then shut off from said pilot burner and by a successive movement of said valve shut off from both burners, a releasable gas-kindling device, and means whereby said valve may be operated with a proper relative sequence of movement and said gaskindling device be released simultaneously with the admission of gas to said pilot burner.

et. In an automatic gas-lighting and extinguishing apparatus having the usual main and pilot burners, the combination comprising a gas cock having a valve controlling the admission of gas to said respective burners by successive and determinate movements of said valve, the same being arranged whereby for one movement of said valve gas may first be admitted to said pilot burner, afterward to said main burner, and then shut oil? from said pilot burner and by a successive movement of said valve shut off from both burners, a releasable gas-kindling device, and means having warn and release movements for operating said valve with a proper relative sequence of movement as aforesaid and for releasing said gas-kindling device simultaneously with the admission of gas to said pilot burner.

' 5. In an automatic gas-lighting device having the usual main and pilot burners, the combination comprising a gas cock having a rotary valve controlling the admission of gas to said respective burners by determi nate and successive rotary movements of said valve in the same direction and in a manner whereby for one determinate rotary movement of said valve gas will be admitted to said pilot burner, afterward to said main burner, and then shut oil from said pilot burner and for a succeeding determinate rotary movement of said valve shut off from both burners, a releasable gas-kindling device, and means whereby said valve may be operated with a proper relative sequence of rotary movement as aforesaid and said gaskindling device be released to ignite the gas issuing from the pilot burner upon the admission of gas thereto.

(3. In an automatic gas-lighting and extinguishing apparatus having the usual main and pilot burners, the combination comprising a gas cook having a valve for controlling the supply of gas to said respective burners, said cock having therein separate passages connecting with said respective burners and a main gas inlet passage, said cock having also a channeled valve adapted to control communication between the main gas inlet passage and said other passages by successive and determinate movements of said valve and in a manner whereby for one movement of said valve gas may be admitted to said pilot burner only, afterward to said main burner, and then shut off from said pilot burner and by a succeeding movement of said valve shut 0E from both burners, a releasable gas-kindling device, and means whereby said valve may be operated with a of movement and said gas-kindling device he released simultaneously with the admission of gas to said pilot burner.

7. In an automatic gas-lighting and extinguishing apparatus having the usual main and pilot burners, the combination comprising a gas cock for controlling the admission of gas thereto, said gas cook having a butt or fixture presenting a face and a rotary valve mounted upon said fixture to turn over said face, said fixture having therein a main gas inlet passage opening into its face and other passages opening into its face and connecting with said respective burners, said other passages being arranged opposite said main gas inlet passage and adjacent one another, the said valve in the part thereof facing said fixture being channeled to provide communication between said main gas inlet passage and either one or both of said other passages or to close communication between the same as said valve is turned to have successive and determinate movements of rotation whereby for one movement of said valve gas may be admitproper relative sequence ted to said pilot burner only, afterward to said main burner, and then shut oif from said pilot burner and by a successive rotary movement of said valve shut off from both burners, and means whereby said valve may be operated with a proper relative sequence of movement and said gas-kindling device be released simultaneously with the admission of gas to said pilot burner.

8. In an automatic gas-lighting device having the usual main and pilot burners, the combination comprising a gas cook having a valve controlling the admission of gas to said respective burners and arranged whereby gas may be admitted to said pilot burner, afterward to said main burner, and then shut oil from said pilot burner, a motor and connecting mechanism for operating said valve, a releasable gas-kindling device for lighting the pilot burner upon the admission of gas thereto, said kindling device comprising igniting material adapted to develop a spark or flame by attritive influence, the same being arranged adjacent said pilot burner, a rotary wheel in engagement with said material, and means whereby said rotary wheel may be turned from off said motor upon the admission of gas to said pilot burner.

9. In an automatic gas-lighting device having the usual main and pilot burners, the combination comprising a gas cook hav- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents mission of gas thereto,

ing a valve controlling the supply of gas to said respective burners, a motor and connecting mechanism for operating said valve, a gas-kindling device operated by said motor for lighting said pilot burner upon the adsaid means comprising igniting material adapted to develop a spark by attritive influence, a rotary wheel mounted to engage said material, said wheel having an indented peripheral edge, means for yieldingly holding said material against the peripheral edge of said wheel, and means whereby said motor may turn said wheel upon the admission of gas to the pilot burner.

10. In an automatic gas-lighting device having a burner, he combination therewith of a gas-kindling device comprising igniting material adapted to develop a spark or flame by attritive influence, a rotary wheel mounted to engage said material, said wheel having an indented peripheral edge, means for yieldingly holding said material against the peripheral edge of said Wheel, means for turning on the gas, and means whereby said wheel may be turned upon the admission of gas to the burner.

GEORGE O. INNIS.

Washington, D. C.

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