USRE22511E - Fuel control device - Google Patents

Description

y 4, 1944- w. F. JACKSON Re. 22,511

FUEL CONTROL DEVICE Original Filed Jan. '7, 1938 I5 Sheets-Sheet l 0 EOE FIE 2.

FIE. I.

July 4, 1944. w. F. JACKSON FUEL CONTROL DEVICE Original Filed Jan. '7, 1938 5 Sheets-Sheet 2 July 4, 1944. w. F. JACKSON FUEL CONTROL DEVICE 3 Sheets-Sheet 5 Original Filed Jan. '7. 1958 FEW M W K Reissued July 4, 1944 FUEL CONTROL DEVICE Wilbur I. JaeksomCompton, Calif., assignor to Grayson Heat Control, Limited. Lynwood,

cum, a corporation of California No. 2,201,399. dated Mi, 21, mo, Serial No. 183,811, January 'i, 1938. Application for reissue February I, 1941, Serial No. 377,901

Claims.

This invention relates generally to fuel control devices and more particularly to combination controls for gas appliances.

The primary object of the present invention is to provide a combination control including a shut-oil. cock, a safety pilot valve and a thermostatic regulating valve which will be completely safe at all times.

There are a few alleged completely safe combination controls on the market. However, all of those with which I am acquainted, have what is known as an openspot. That is, at some point in the procedure necessary to light the appliance, the valves may all be in open position with the safety pilot valve being held open. If the pilot flame should be extinguished at this time, the natural thing for an inexperienced operator to do is to try to relight the pilot. A delay in iinding and striking a match would allow suiliclent gas to flow through the open valves to cause an explosion. A purpose of the present invention is to provide a control in which the thermostatic valve for regulating the flow of fuel to the main burner is locked in a closed position until the shut-oil cock is fully open, the safety valve set and the pilot burning.

.It is still a further object to provide a combinatlon control in which the shut-oil cock, safety valve and regulating valve are so arranged as to require the operatorto follow the correctprocedure in lighting the appliance.

Another objectis the provision of a control device in which a lever interconnects the handle of the cock and the adjusting means of the thermostatic valve to prevent the adjusting means from being moved above a setting which is sumciently low to preclude opening of the valve, means being provided to avoid such interconnection only when the cock has been turned to its final running position.

The provision of a combination control which is compact as well as reliable and which includes various features of construction facilitating low cost manufacture and insuring ease of operation is another object accomplished by the present invention.

The manner in which the foregoing objects are accomplished and additional advantageous features will become apparent as the description of the structure progresses. For purposes of illustration only, the device is shown in the drawings and will be hereinafter described as adapted for use with a gas burning domestic water heater.

Referring to the drawings:

Fig. 1 is a side elevation of the control;

Fig. 2 is a fragmentary sectional view along the line 2-4 of Fig.

Fig. 3 is a side sectional view of the device;

Figs. 4, 5, 6 and 7 are partial views in section along line 4-4 of Fig. 2 showing the relative po-' sitlons of the passages in the rotor and stator at "011, start, pilot only" and "run positions, respectively;

Fig. 8 is an elevation of the dial;

Figs. 9, l0 and 11 are sections along lines l-!, il-ill and iil i, respectively, of Fig. 8:

Fig. 12 is a partially sectional end view of the device; and

Fig. 13 is a sectional view along line' li-ll of Fig. 12'.

As shown in the drawings. the controls are housed in a casing i having an inlet 2 and an outlet I connected to supply gas to a main burner 4 through pipe to. Gas entering inlet I proceeds through passage to a rotor disk type of gas cook including a stator I formed in the easing and a rotor disk I. The stator has a' smooth, accurately finished, liat seat intercepting the main conduit through the casing, of which passage 5 is a part, and having a central, threaded hole therein. The rotor disk has a similarly finished face engaging the seat with a central opening therethrough. A stem I, having a head on one end, threads on the other end and a machined portion intermediate the ends, extends through the central opening in the rotor with the threaded end tightly mounted in the hole in the stator and the machined portion serving as an axle for the disk.

A cup-shaped dial, operating handle or knob. 9 fits over and around the disk and is secured thereto by screws ill. The dial 9 has a central opening through which the head of stem I extends. The face of the disk I is held tightly against the stator seat by a spring ii between the head of the stem and the rotor. The front face of dial 9 carries indicia and a plate I! secured to the head of stem 8 substantially covers the dial face but has a portion cut away as at I! to permit reading of the indicia corresponding to the rotor position. A pointer II is also mounted on the casing and'extends over the side of the dial to cooperate with the indicia toindicate the ro tor position.

In addition to passage 5, there are three other passages, l9, Ill and ILopenlng into the stator seat. Passage ll leads from the stator to a manually adjustable pilot valve of a well-known type which is accessible upon removal of cap ll. An

outlet II. at the rear of this valve is connected bymeansoftubinglltoapiiotbumerll.

Passage ll forms partofthemainconduitbetween inlet 2 and outlet stator seat to the safety pilot valve 2|. The small passage Iileads from the'discharge side of the safety valve tothestator.

The rotor disc 1 has two arcuate grooves n Iandleadsfromtheoperation of the device. Until then, it will be suincient to note that these positions are reached intheordernamedintbenormai procedureby continuous rotation in one directions of the manually operated dial The passages in the rotor andstatoraresoamnged thatthedirection of rotation tends to advance the axle stem I into theholeinthestator. Purthermeansare provided for preventing the dial from being turned from one position to another in the opposite direction tending toloosen the stem. This means consists of a latch member or pin il located beneath the pointer l4 and urged by spring it against the edge of the cup-shaped dial I which has a plurality of notches il and-l1 formed therein. These notches are adapted to receive the member II at each of the operating positions -to provide a friction latch for the dial. Inspection oi Figs. 9 and 10 will reveal that the notches H are shaped with one square corner It so that from the 01'! position, the dial may be turned onLv' toward the start" position, and from start" only toward run." From Fig. 11 it can be seen that notch II is so shaped that from run the dial may be turned to "of!" or may be turned a short distance backward until memher it engages the corner II. The position of the rotor when the member II engages corner It is not a normal operating position but is a minor position known as 'pilot only position and is provided for reasons set forth hereinafter. The dial may not be turned from run to start without first passing the "ofl" position.

The shut-oi! cock thus provided is of decided advantage in its compactness and ease of manuiacture and assembly and in its particular cooperation with the other members of the control unit.

the valve stem ll. The other end of the lever liispositionedtobeengagedbythecam" carried byorformedon the edge 01' dial I to open the safety valve II upon rotation of the diaigi'rom "start" to "run-J Thecam does not engage the lever at the "start" position and it has completely passed the lever before the "run" positionisreached.

A thermomagnetic assembly is employed to hold the safety valve open against the spring I! after the cam II has released the lever. The assembly includes a horseshoe-shaped electromsgnet ll within a housing It removably mounted on the casing I over the flexible sealing disk 38. A rod 8, extending through the base of .the magnet in line with the valve stem It has one end engaging the button 42 while the other end carries an armature bar 41. Bar 41 is urged toward the poles or the electromagnet N by a light spring 48. The spring 2!, being much strongerthan spring ll, tends to hold the in the position shown in Fig. 13.

The arms oi the horseshoe-shaped electromagnet carry coils ll of the wire it which extends irom the housing 45 through a current carrying tube II to be connected with one element ll of anelectro-thermocouple. The other end oi the wire is connected to the tube 5| as at It, the tube in turn being connected to the other element '4 of the thermocouple. The outer ends or the two elements are connected at II and are held in position to be heated by the flame from the pilot burner 21 by a bracket 8'. The heat of the pilot flame on the Junction II will create a current in the coils l9 suilicient to energize the .electromagnet 44. Therefore, when the safety valve is opened manually by means of the cam 43 and lever ll, the spring ll will force the armature bar 41 against the magnet 4|, where it will be held to retain the safety valve in open position. pon extinguishment of the pilot flame, the junction will cool and the current will cease. whereupon the electromagnet will fail to hold the armature bar against the force oi spring I! and the safety valve will be closed.

The passage 4| leads from the safety valve 28 to the thermostatic regulating valve ll. How- The safety valve to is constantly urged toward its seat ill by a spring 2!. The seat 3| is carried on a member ll which is threadedly mounted in the casing I. Valve 20 has a composition insert 32 which engages the seat II and which is held in place by a retaining washer 38. Access to the valve "and member 3i may be gained by removing cap 34. The valve II is actuated by a valve stem 3! extending therefrom through a bore in member II to a thin. flexible sealing disk I which is clamped at its peripheral margin between a shoulder SI formed in the casing and the member II. The washer 31 serves to insure a gas-tight seal. The member 3i extends from the valve seat to the seal and is provided with radial ports I! permitting gas through the valve II to flow therethrough to passage ll forming part of the main conduit through the A bell-crank lever M is pivoted on the casing and'on one end carries a button l2 engaging ever, a manually adjustable, restriction valve 58 is inserted in passage II and serves toadjust the pressure of the gas fed to the burner 4.

.A spring 59 constantly urges the regulating valve 51 toward its seat it carried by the member 6| which is removably mounted in the casing. Access to valve 51 and member 6i may be gained by removing cap '2. The valve 51 is operated by a valve stem'comprising two relatively adjustable parts It and 64, the latter of which engages a thin metal snap-action or clicker disk 65. The disk is of a type well-known in the art and is adapted to be held near its peripheiy between an annular knife-edged shoulder 88 on member Ii and an annular knife-edged shoulder 81 of a slightly smaller radius carried by a thrust member '8. Movement of the thrust member back and iorth along the same axis as the valve 51 results in a snap flexing of the center of the disk 65 back and forth to operate the valve. The

the sealing disk II, the button being in line with 16 thrust member 68 rests against a flexible sealing disk I! and is moved by a thermally-responsive element mounted on the other side of the disk. The member II which carries the valve seat 50 and the shoulder It is provided with radial ports oumittzing the flow of gas from valve 51 to the The thermally-responsive unit as shown is of the rod and tube type and is especially arranged tobeinsertedlnthestoragetankofawaterheating system. The tube ll of the thermo-responsive unit has a high coefficient of expansion and is securely mounted at its inner end on the easing I. Therodll oftheunithasalowcoefllcient of expansion and extends within the tube and is threadedly connected with a plug 12 anchored in the outer end of the tube 10. The inner end of the rod carries a cap 13 which engages the sealing disk 69. The differential in the expansion of the rod and tube under the influence of the heat of the water causes the rod to actuate the thrust member II to effect opening and'closing of the valve II. The temperature at which valve 51 will be operated may be adjusted by means of a manually operated lever 14 attached to the rod II by set screw 15. The lever 14 carries a handle 18 and a pointer 11 for cooperation with indicia carried on the casing. Movement of the lever up and down as shown in Fig. l rotates the rod 1| to screw same further in or out of plug 12 to change the expansion differential. It

is to be noted that-the range of adjustment is such that at the lowest position the pointer registers o That is, the temperature setting is such that the water cannot get cold enough to open the valve 51.

' A locking lever II is secured at one end to the lever 14 to be movabletherewith and is guided by a pin 19 in the casing l extending through a slot ll in the lever 18 intermediate the ends thereof. The locking lever I8 extends from lever I4 upwardly toward the side of the cup-shaped dial I. The lever is is of such a length that its upper end will clear the side of the dial only mentioned above. The side of dial 9 has an elongated opening Si in such a position that the opening will be opposite the end of lever 18 when when the adjusting lever is at the lowest position the dial is in run" position. Thus, the side of the dial is in eilect a stop and the adjusting lever 14 may be lifted above its lowest position only when the dial is turned to "run position. At that tlme, lifting of lever 14 will raise lever 18 whose upper end enters the opening BI and the dial may not be turned away from run position until the adjusting lever is re-set to'its lowest point. Because of the position of lever 18 the notches II will not permit it to be raised so that the adjusting lever is therefore locked in its lowest position with the regulating valve closed and is released only upon rotation of the dial to "run" position. As shown in Fig. 12 the slot 80 in the locking lever 18 is so shaped that after the end of the lever enters the elongated opening. II in the dial, it 'will be moved along the opening upon continued upward movement of lever I4 and thus avoid the rotor disk of the shut-oil! cock which is enclosed by the dial. I

In installing the control the thermostatic unit is inserted into the tank through an opening provided in the tank and the threaded boss 82 screwed into the opening. However, in turning the casing to screw in the boss the tubing SI of the thermomagnetic assembly gets in the way. The assembly is therefore removed and after the casing is mounted on the tank, the assembly is slipped in sideways between the tank and the casing and secured by screws. The button 42 is tapered to lift the rod 46 into place as the assembly is slipped in sideways.

The operation of the control is comparatively simple and provides complete safety. In the "o position of the dial, the relative positions -the regulating valve is shut.

of the passages in the stator and rotor are as shown in Fig. 4 and no gas can pass the shut-- of! cook. The pilot cannot be burning, the safety valve is shut and because of the locking lever, Rotation of the dial to "start" places the rotor passages as shown in Fig. 5 so that gas may pass from inlet e I through the small groove 23 to e II to the pilot burner which should then be ignited. In the "start" position, gas also passes through groove 23 to passage 2s and the safety valve ll. However, the safety valve is still closed as is the regulating valve.

After a time interval of several seconds to permit the pilot flame to heat the thermocouple sufllclently to energize the electromagnet, the dial is rotated directly from sta to "run." After leaving the start" position, the cam 43 on the dial engages the bell-crank lever II to open the safety valve which is then held open by the magnet. Continued rotation places the groove 23 in position to connect both passages 5 and 2| to the pilot passage ll so that gas to the pilot is supplied from both ahead and behind the safety valve at that particular instant. However,

position of the rotor and stator is as shown in Fig. 7 and gas flows from inlet passage 5, through groove 22, passage 20 and the safety valve to passage ll. Gas also flows from the discharge side of the safety valve through passage 2 l, groove 23 and passage I! to the pilot burner.

Thus, when the dial has been turned to "run position, the shut-off cock is in full open or running position, the pilot is burning gas supplied under the control of the safety valve which is held open and will be held open by the magnet so long as the pilot is burning. Then, and then only may the adjusting lever be lifted to set the temperature at which the regulatin valve will be operated. If the water is colder than the temperature so set, the regulating valve will be opened and gas will flow to the main burner to be ignited by the pilot flame. If for any reason the pilot flame is extinguished, the safety valve 1 will be closed, shutting off all gas to both burners.

Thereafter, before the dial can be turned to supply gas to the pilot and to open the safety valve, the adjusting lever must be set to its lowest or ofl position with the regulating valve closed.

The pilot on position on the dial is not intended to be used in the ordinary cours of events. This position is provided between the start and the "run" positions to meet the requirements of the American Gas Association that means shall be provided independent of any automatic device for controlling or shutting off the main gas supply without affecting the pilot gas supply. In the pilot only" position, all gas is shut oil? by the cock except that passing from the inlet passage to the pilot and the pilot only" position may be reached from the run" position by turning the dial backwards.

Although in the present device there are a least two positions of the gas cock, one between start and pilot only and one between pilot only" and run," in which gas may flow in the main conduit through the cock at the same time that the safety valve would be prevented by a portion of the cam from closing completely, it will be understood that no gas can pass to the main burner because the regulating valve is locked in closed position. It will then be safe are intended to cover all legitimate modifications and other embodiments of the disclosed invention.

I claim:

1. In a fuel control device, the combination of a manually operated shut-oi! cock, a safety valve and a thermally actuated valve arranged inseries in a main conduit, an auxiliary conduit extending from the discharge side of the safety valve to said cook, a pilot burner having communication with the cock, said cock having passages tlnrein arranged in one position of the cock to supply fuel to said burner independently of the other valves and in another position to open the, main conduit to the safety valve and to supply fuel from the auxiliary conduit to the burner, means for opening the safety valve upon rotation of said cock from the first to the second position, means responsive to the presence of flame at the burner for'holding said safety valve openQadiusting means associated with said thermally actuated valve for setting the temperature at which the same will be operated, a stop, and a member movable with said adjusting means and adapted to engage said stop to prevent moving of said adjusting means above a predetermined setting, said predetermined setting being sufficiently low to preclude opening of the thermally actuated valve, said stop being associated with said cock and arranged to avoid such engagement when the cock is in the second position.

2. In a fuel control device, the combination of a shut-off cock, a safety valve and a thermally actuated valve arranged in series in a main conduit, an auxiliary conduit extending from the discharge side of the safety valve to said cock,

a pilot burner having communication with said cock, a manually rotatable dial for positioning the cock, said cock having passages therein arranged in one position thereof to supply fuel to said burner independently of the otheryalves and in another position to open the main conduit to the safety valve and to supply fuel from.

the auxiliary conduit to the burner, means for opening the safety valve upon rotatlon,of the cock from the-first to the second position, means rendered operative'by the burner flame for holding the safetyvalve open, adjusting means assoelated with said thermally actuated valve for setting the temperature at which the same will be operated, and alever movable with said adlusting meansand havinga portion adapted to engage said dial to lock saidgadjusting means in a position to;preclude opening of the thermally actuated valvegsaid dial having an opening located to permitimovement thereintoof said portion to avoid such engagement when the cock is in the second position.

3. In a fuel control device, the combination of. a shut-off cook, a safety valve and a thermally actuated valve arranged in series in a main conduit, an auxiliary conduit extending from the discharge side of the safety valve to said cock, a pilot burner having communication with said cook, a manually rotatable dial for positioning the cock, said cock having passages therein arranged in one position of the cock to supply fuel to said burner independently of the other valves and in another position to open the main conduit to the safety valve and to supply fuel from the auxiliary conduit to the burner. a lever coni nected with said safety valve, a cam carried by said dial and operatively connected with said the same will be operated, and a membermovable with said adjusting means and adapted to engage a portion of saiddial to lock said adjusting means in a position to preclude opening of said thermally actuated valve, said dial being shaped to avoid such engagement when the cock lsin the second positio 4. In a fuel control ,device, a casing having a main conduit therethrough, a cock and a safety valve therein, a manually rotatable dial for operating the cock having oil, starting and running positions, a pin mounted on the casing, a spring for constantly urging said pin against the dial, said dial having a plurality of notches therein located to receive said pin in a notch at each of said positions to provide a friction latch for the dial, a lever connected to said safety valve, a cam carried by said dial and arranged to engage said lever to effect opening of the safety valve upon rotation of the dial from starting to running position, means rendered operative by the pilot flame for holding said safety valve open, a then mostatically operated valvein said conduit, adjusting means for setting the temperature at which the thermostatic valve will be operated, and a member movable with said adjusting means into cooperative relation with the dial to prevent opening of the thermostatic valve except when the cock is in running position and to prevent closing of the cock when the thermostatic valve is open.

5. In a fuel control device, a casing, a regulating valve therein, a thermo-responsive means including a tube having its inner end fixedlyset the temperature at which said valve will be position.

lever to effect opening of the safety valve upon ll operated, a shut-ofl cock having a series of rotary positions including a final running position, a

manually rotatable dial for operating said cock,

a second lever secured to and movable with the a first lever and adapted to engage a portion of said dial to prevent movement of said member above a' predetermined setting, said setting being sufllciently low to preclude opening of said valve, said dial portion being shaped to permit movement of said member above the predetermined setting only when the cock is in the running 6. A fuel control device comprising a fuel conduit, a manually operable shut-oil valve,' a safety valve and a thermostatic regulating valve ar- "ranged in series in said conduit, adjusting means for setting the temperature at which the regulating valve will be thermostatically operated, an operative connectionv between the shut-off valve and the safety va'lve'for opening the safety valve upon movement of "theshut-ofl' valve from closed to running position,.and means interposed between said shut-off valve and the temperature setting means of the regulating valve for preventing a low temperature setting of the regulating valve except when the shut-off valve is in running position and for preventing closing of the shut-o! valve except when a high tomg tting of the regulating valve has been effected.

' '1. A fuel control device comprising a fuel conduit, a manually operable shut-off valve, a safety valve and a thermostatic regulating valve arranged in series in said conduit, adjusting means for-setting the temperature at which the regulating valve will be thermostatically actuated, a knob for operating the shut-off valve, said knob being provided with a cam, a lever interposed between said knob and the safety valve, whereby the safety valve is opened by the .cam upon'movement of the shut-off valve from closed to running position, and means including a slot formed in said knob and a lever connected with said regulating valve adjusting means for preventin a low temperature setting of the regulating valve when the shut-ofl valve is not in running position and'for preventing movement of the shutoff valve from running position when said adlusting means is disposed in a high temperature setting position.

8. In a fuel control device, a casing, a regulating valve therein, a thermostat for operating said valve, adjusting means connected with said thermostat for setting the temperature at which the valve will be operated, a shut-off valve movable to a plurality of positions including a final runnin position, a lever connected to and movable with said adiusting means, and means movable with the shut-off valve across the path of said lever to lock said" adjusting means in a position to preclude opening of the regulating valve, said locking means being inoperative to restrain said lever when the shut-off valve is turned to the running position, thereby permitting a temperature change setting of the regulating valve when the shut-off valve'is in running position.

9. In a fuel control device, a casing, a regulating valve therein, a thermostat for operating said valve, adjusting means connected with said thermostat for setting the temperature at which the valve will be operated, a shut-on cock having a series of positions including a fully open final running posit on. a manually rotatable knob for 4 operating said cock, a member connected to and movable with said adjusting means and having a portion adapted to engage said knob to lock said adjustin means in aposition to preclude opening of the valve when the cock is not in final running position, said knob having an opening arranged to receive sa rlportion when the cock is turned to the running position. thereby permittin thermostat settin and simultaneous lock ng of the knob against rotation.

.10. In a device of the character described, in comb nation. a control device having an electromagnet provided with an armature connected to a controlling member and adapted when energized to hold said member in operating position and when deenergized to release said member for movement to a safety position, a shutoff cock, reset means for resetting said armature to attracted position and said controlling member to operating position, and means for preventing the resetting operation of said reset means except when said shutoff cock is closed.

11. In a device of the class described, a shutoff tion of said reset means when said valve is open.

12. In a device of the class described, thermoelectric safety means, a shutoff valve, reset means for resetting said thermoelectric safety means, and means for preventing the resetting operation of said reset means except when said valve is closed.

, 18. In a device of the class described, thermoelectric safety means, a controlling member having different positions, reset means for resettin said thermoelectric safety means, and means for preventing the resetting operation of said reset means when said controlling member is in one position and free to permit the resetting operation of said reset means when said controllin member is in a different position.

14. In a device of the character described, in combination, a control device having a safety valve, an electromagnet provided with an armature adapted when energized to hold said valve in operating position and when deenergized to release said valve for movement to a safety position, reset means operable to reset said armature to attracted position and said safety valve to operating position, a regulating valve mounted in said device, and means operable between said regulating valve and reset means for preventing resetting operation of said reset means except when said regulating valve is closed.

15. In a device of the character described, in combination, a control device having a safety valve, an electromagnet provided with an armature adapted when energized to hold said valve in operating position and when deenergized to release said valve for movement to a safety position, reset means operable to reset said armature to attracted position and said safety.

valve to operating position, a regulating valve mounted in said device, and movable means associated with said regulating valve and having interlocking relation with said reset means to prevent resetting operation of said reset means when said regulating valve is open and movable out of interlocking relation with said reset means to permit resetting operation of said reset means when said regulating valve is closed.

l6.'In a control device for fuel burners, the combination of. electromagnetic safety means, reset means for resetting the electromagnetic safety means, a valve casing, a valve controlling the flow of fuel through said casing, and means operatively connecting the reset means and the valve for preventing the resetting operation of valve, a reset stem mounted for reciprocatory the reset means except when said valve is closed.

17. In a. control device for fuel burners, the combination of electromagnetic safety means, reset means movable from one position to am other for resetting the electromagnetic safety means, a valve casing, a valve in the casing movable between positions for controlling the flow of fuel therethrough, rotatable means operable for causing movement of said valve between said positions, and means effective upon operation of the rotatable means for preventing resetting movement of said reset means except when said rotatable means is in a position in which said valve is closed.

18. In a control device for fuel burners, the combination with electromagnetic safety means and a shut-off cock movable between open and closed positions for controlling fuel flow to the burner, or reset means for resetting said electromagnetic means, a rotatable member operable for causing movement of said shut-oil cock between saidpositions, and means including a munber movable relatively to said rotatable member for locking said reset means to prevent resetting operation, one of said members having an opening into which a portion of the other said member is adapted to extend in the open position of said shut-ofleock.

18. In a control device for fuel burners. the combination of a shut-off cock movable from one position to another for controlling the supply of fuel to the burner, a safety valve for controlling the supply of fuel to the burner, electromagnetic-means for governing the operation of said safety valve, a member extending between said shut-oi! cook and said electromagnetic means and operable for resetting said electromagnetic means, and means oooperating with said shut-oil cock for permitting operation of said member when said shut-oi! cock is in one position but preventing operation of said membasil mwmmamct-csmamanmma- 20.Inacontroideviceforfueibln'nera,tha

combinationofashut-ofleockmovabiefrom one position to mother for controlling the supply of file] to the burner. a safety valve for eontrolling the supply of fuel to the burner. electromagnetic means for governing the operation of said safety valve, a pivoted member extending between said shut-on cock and said electromagnetic means and operable {or resetting said electrometic means, and means Qooperating with said shut-oi! cock for permitting operation of said pivoted member when saidshut-oi! cock is in one position but preventing operation of said pivoted member when said shut-oi! cock is in another position.

WILBUR I". JACKSON.

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