US3563457A

US3563457A - Oven control with shutoff for standing pilot

Info

Publication number: US3563457A
Application number: US18376A
Authority: US
Inventors: Frank H Bergquist; Richard U Ives
Original assignee: Harper Wyman Co
Current assignee: Harper Wyman Co
Priority date: 1970-03-13
Filing date: 1970-03-13
Publication date: 1971-02-16
Anticipated expiration: 1988-02-16

Abstract

An oven control particularly useful for vehicle-mounted ranges and the like includes a single knob controlling a manual valve and a thermostatic valve. The knob may be moved to select a desired operating temperature and the manual valve is opened to supply fuel to a standing pilot, a control pilot and a safety valve which opens to supply fuel to the oven burner when a flame indication is sensed at the control pilot. The thermostatic valve is controlled by the knob setting to maintain a selected oven temperature. When the knob is turned to a normal off position, the flow through the manual valve to the control valve pilot and safety valve is discontinued, but the standing pilot remains ignited to provide subsequent automatic ignition. An additional off position is provided for conveniently discontinuing all fuel flow to the range, including flow to the standing pilot.

Description

United States Patent Inventors Frank H. Bergquist Justice; Richard U. Ives, Flossmoore, Ill. Appl. No. 18,376 Filed Mar. 13, 1970 Patented Feb. 16, 1971 Assignee Harper-Wyman Company Hinsdale, III.

a corporation of Illinois Continuation of application Ser. No. 784,301, Dec. 17, 1968, now abandoned.

OVEN CONTROL WITH SHUTOFF FOR STANDING PILOT 9 Claims, 8 Drawing Figs.

Int. Cl F23n 5/06 Field of Search 236/15A, 68D, 99; 431/(Inquired) Primary Examiner-William E. Wayner ABSTRACT: An oven control particularly useful for vehiclemounted ranges and the like includes a single knob controlling a manual valve and a thermostatic valve. The knob may be moved to select a desired operating temperature and the manual valve is opened to supply fuel to a standing pilot, a control pilot and a safety valve which opens to supply fuel to theoven burner when a flame indication is sensed at the control pilot. The thermostatic valve is controlled by the knob setting to maintain a selected oven temperature. When the knob is turned to a normal off position, the flow through the manual valve to the control valve pilot and safety valve is discontinued, but the standing pilot remains ignited to provide subsequent automatic ignition. An additional off position is provided for conveniently discontinuing all fuel flow to the range, including flow to the standing pilot.

PATENTED FEBISIQYI SHEEIlUFZ FIG. 2

FRANK H. BERGQUIST RICHARD O. IVES At'mrnevs IOO INVENTORS:

OVEN CONTROL WITH SHUTOFF FOR STANDING PILOT This application is a continuation of 784,301, filed Dec. 17, 1968, now abandoned.

The present invention relates to oven controls, and more particularly to an improved control for ovens associated with vehicles or the like wherein it is desirable to discontinue all flow of fuel to the oven under some circumstances.

The convenience and utility of modern gas ovens are enhanced by the provisions of two highly desireable featuresautomatic ignition and low temperature operation. In a typical system a heater or control pilot and a small, continuously burning standing or continuous pilot are located near the main oven burner. When the oven is to be operated, fuel is supplied to the control pilot and ignited by the standing pilot. Flame at the control pilot heats a sensing device to open a safety valve or burner valve to admit fuel to the main burner for ignition by one of the pilots. In low temperature operation, sensed oven temperature controls a thermostatically operated valve in order to cycle flow to the control pilot, thereby to cycle flow to the main burner through cycling operation of the safety valve. Since the main burner does not operate continuously, the oven may be operated at temperatures below the minimum temperature obtainable with safe continuous operation. In this manner, both the automatic ignition feature and the low temperature operation feature result from the presence in the oven of a small continuously burning standby pilot flame.

Known oven controls for modern systems of this type include a single knob for controlling the setting of a thermostatic valve and for operating a manually controlled valve. The knob is movable to a range of operating positions wherein fuel is communicated to the safety valve and to the control pilot under the control of the thermostatic valve which is conditioned by the knob setting for operation at a selected temperature. In the off position of known controls, flow to the safety valve and to the control pilot is interrupted by the manual valve. Since automatic ignition and low temperature operation depend upon the presence of a continuous flame at the standing pilot, flow to this pilot is independent of the setting of the control and continues in the off position.

In some installations of gas ranges it is necessary or desireable to shut off all fuel flow under certain circumstances. For example, gas ranges are widely used in vehicles such as travel trailers wherein all gas flow to the range is discontinued when the vehicle is under way. When the range includes a standing pilot, movement of the oven control to the off position is not sufficient to discontinue all fuel flow to the range since the standing pilot continues to receive fuel. Thus it has been necessary to use an additional valve for complete shutdown, such as a special standing pilot valve or a shut off valve supplying the range manifold. In addition to the inconvenience and expense of providing and operating two separate valves, a further disadvantage results from the'fact that the additional valve is ordinarily located in an inconvenient location.

Among the objects of the present invention are to provide an improved range control for applications where complete fuel shutoff may be required; to provide a control wherein convenient shutoff of the standing pilot may be achieved through operation of the control knob; and to provide a control making possible automatic ignition and low temperature operation in normal circumstances, together with positive control of flow to the standing pilot.

In brief, one embodiment of the present invention may comprise an oven control for use with an oven of the type including a control pilot and a standing pilot, which pilots may be separate or may be combined into a single unit in accordance with known practice. A safety valve or a burner valve serves to admit fuel to the oven burner in response to a flame indication at the control pilot. The control of the present invention includes a manual valve and a thermostatic valve both controlled by a single knob. In an operating position, the knob causes the manual valve to admit fuel to the standing pilot, the control pilot and the safety valve. The knob setting also conditions the thermostatic valve to control the fuel flow in order to maintain a selected temperature.

In accordance with a feature of the present invention, the control includes two off positions-one for ordinary use and another for discontinuing all flow to the oven. When the knob is turned to the normal off position, the manual valve blocks flow to the control pilot and to the safety value while fuel continues to flow to the standing pilot so that subsequent automatic ignition may be accomplished. When the knob is turned to the additional off position, the standing pilot is extinguished. If desired, the control may also serve to discontinue flow to other devices such as a range top standing pilot or the like.

The above and other objects and advantages of the inven tion will appear from the following detailed description of an illustrative embodiment of the invention illustrated in the accompanying drawings wherein:

FIG. 1 is a schematic and diagrammatic illustration of an oven system and control embodying features of the present invention;

FIG. 2 is a sectional view of the control shown diagrammatically and schematically in FIG. I taken along the line 2-2 of FIG. 4, and assuming FIG. d to show the complete control;

FIG. 3 is an elevational view, on a reduced scale, of one side of the valve body of the control taken from the line 3-3 of FIG. 2;

FIG. 4 is a view similar to FIG. 3 showing the opposite side of the valve body taken from the line 1-4 of FIG. 2;

FIGS. 5, 6 and 7 are composite views of the control knob and portions of the control shown in a sectional view taken along the line 5-5 of FIG. 2, and illustrating the control in the normal off position, an operating position and the additional off position respectively; and

FIG. 8 is a fragmentary schematic and diagrammatic illustration of an alternative pilot arrangement for the system of FIG. 1.

Having reference now to the drawings and initially to FIG. 1, there is shown a gas oven system designated as a whole as 10 and an oven control generally designated as 12 constructed in accordance with the principles of the present invention. The control 112 is supplied with gas by way of a conduit 14 from a manifold 16, and serves to control the flow of fuel to a main burner is, a control or heater pilot 20 and a standing or continuous pilot 22. When it is desired to operate the oven, fuel is supplied to the control pilot 20 by way of a conduit 24, and this fuel is ignited by a flame burning at the standing pilot 22 which is normally ignited and is normally supplied continuously with fuel by way of a conduit 26. Fuel is also supplied to a normally closed safety valve or burner valve 28 by way of a conduit 30. A flame-sensing element 32 disposed in heatsensing relationship to the control pilot 20 communicates with the safety valve 28 by way of a tube 34. When the element 32 is heated by a flame at the control pilot 20, the safety valve 28 opens to admit gas to the main burner. The gas emerging from the main burner is ignited by one of the pilots 20 and 22 and heating of the oven commences. The safety valve 28 is shown only in block form in view of the fact that the construction and operation of such devices are familiar to those skilled in the art.

An oven temperature sensing bulb 36 is located in the region heated by the main burner 18 and communicates with the control 12 by way of a tube 38. In baking operation, when the oven temperature approaches a selected baking temperature the control 12 operates to discontinue the flow of fuel to the control pilot Zll whereupon the sensing element 32 cools and the safety valve 2% closes to discontinue ignition at the main burner 18. Upon subsequent cooling of the oven, gas is again supplied to the control pilot 2%) by the control 12, and the main burner 18 operates once more. In this manner, the main burner 18 is cycled on and off in order to maintain a selected baking temperature. In the illustrated arrangement, broil operation is similar except that the supply of gas to the control pilot 20 and the main burner 19 is continuous rather than cycling.

In accordance with an important feature of the present invention, the control 12 is provided with two off positions. In normal use, when the control is turned to off the flow of fuel to the safety valve 28 and control pilot 20 is blocked, but fuel continues to flow to the standing pilot 22 so that automatic reignition is possible when the control is again turned to an operating position. The control 12 is also provided with an additional off position, and when adjusted to this position the control is effective to block flow to the standing pilot 22 so that all flow of fuel to the oven is discontinued.

In accordance with the invention, the control 12 may be used to control additional fuel-utilizing devices. For example, the system illustrated in FIG. 1 includes an additional standing pilot 40 normally supplied continuously with fuel by way of a conduit 42. The pilot 40 may be used to accomplish ignition of range top burners or the like. In the additional off position of the control 10, flow to the pilot 40 is discontinued as well. When it is desired to operate the system 10 after it has been moved to the additional off position, the control is moved to the normal off position and the standing pilots 22 and 40 are reignited, as by a match.

In connection with consideration of the system 10 illustrated in FIG. 1, it should be noted that the control pilot 20 and the standing pilot 22 are illustrated schematically as independent and distinct pilot burners supplied independently through

conduits

24 and 26. However, as will be readily understood by those skilled in the art, the system 10 may be provided with an alternative pilot arrangement in the form of a single tube, dual rate pilot burner such as that shown schematically in FIG. 8. As there illustrated, a single pilot burner 44 is disposed in ignition relation to the main burner 18. The pilot 44 in the normal off position is supplied with a continuous and small flow of fuel through a conduit 46. Consequently a small standby flame (shown in full lines) is normally present continuously at the pilot 44. When it is desired to operate the oven burner, the flow of fuel through the conduit 46 is increased so that the flame impinges against a deflector 48 serving to deflect a portion of the flame against the flame-sensing element 32. If the dual rate pilot of FIG. 8 is used, the conduit 46 is supplied with both the standing pilot flow and the control pilot flow from the control 12. As used herein, the terms standing pilot and control pilot" are intended to encompass both alternative types of pilot system.

In order to regulate the flow of gas from the manifold 16 to the burners associated with the system 10, the control 12 is provided. The control 12 is illustrated diagrammatically in FIG. 1, while its construction appears more clearly from FIGS. 27. The control 12 includes a manual valve generally designated as 50 and a thermostatic valve generally designated as 52, both controlled by a single operator or knob 54. An inlet passageway 56 conducts fuel from the supply to the manual valve 50. When the knob 54 is moved to an operating position, the manual valve 50 supplies gas to an internal cavity 58 of the control by way of a passageway 60 leading from the manual valve 50. The thermostatic valve 52 is conditioned by operation of the knob 54 to regulate flow from the cavity 58 to the control pilot 20 by way of a passage 62 and to the safety valve 28 by way ofa passage 64 thereby to maintain a selected oven temperature. During operation of the oven, the manual valve 50 is also effective to supply fuel from the inlet passage 56 to a passage 66 communicating with the standing pilot 22. In the illustrated embodiment of the invention, the passage 66 also communicates with the additional standing pilot 40.

In accordance with an important feature of the present invention, the control 12 is provided with a normal off position and also with an additional off position wherein all flow of fuel to the range is discontinued. When the knob 54 is moved to the normal off position, the manual valve 50 is controlled to discontinue flow from the inlet passage 56 to the passage 60. In this manner, all flow to the safety valve 28 and the main burner through the passageway 64 is blocked. Similarly, all flow to the control pilot 20 by way of the passage 62 is blocked. In the normal off position, however, communication through the manual valve 50 from the inlet passage 56 to the standing pilot passage 66 is maintained so that the flames burning at the standing pilots 22 and 40 continue for subsequent operation of the range.

When the knob 54 is moved to the additional off position provided in accordance with the present invention, the flow of fuel between the inlet passage 56 and the standing pilot passage 66 is discontinued. In addition, the flow between the

passages

56 and 60 remains blocked. Thus in the additional off position all flow of fuel from the manifold 16 into the oven in blocked simply by operation of the single operating knob 54.

Proceeding now to a more detailed description of the construction of the control 12 as illustrated in FIGS. 27, the control includes a valve body 68 cooperating with a valve housing 70 to define the internal cavity 58. A sealing gasket 72 is held between the body 68 and the housing 70 by a plurality of fasteners 74. The manual valve 50 is disposed on the outer surface of the valve body 68 and includes a valve surface 76 of the body 68 cooperable with=a valve surface 78 formed on the face of a valve rotor 80. Fuel is supplied to the manual valve 50 through the inlet passage 56 including a lateral portion 56a (FIG. 3) adapted to be connected to the inlet conduit 14 and an arcuate portion 56b FIGS. 2, 3 and 5-7). The arcuate portion 56b terminates at the valve face 76 in the form of a valve recess or slot.

From the manual valve 50, fuel is communicated freely to the cavity 58 in any operating position of the valve by way of the passageway 60. The passageway 60 includes a first portion 60a forming a radial valve recess or slot in the valve face 76. The slot 60a communicates by way of an angularly disposed passage 60b (FIGS. 2 and 4) with a well-like portion 60c of the passage formed on the interior surface of the valve body 68. Free and continuous communication is established between the well 600 and the chamber 58 by way of a recess 60d disposed in the surface ofthe body 68 (FIGS. 2 and 4).

In the operating and normal off positions of the control 12, fuel is introduced to the standing pilots 22 and 40 through the passage 66. As appears most clearly in FIG. 3, the passage 66 includes a first portion 66a in the form of a recess or slot in the valve surface 76. The slot 66a communicates with a transverse passage 66b leading to an enlarged recess 66c defined in one end of the body 68. A filter assembly 82 is held in the recess 660 by a cap 84 (FIG. 2) for filtering the standing pilot flow. From the filter assembly 82, fuel flows to the conduit 26 and standing pilot 22 by way ofa passage 86 and flow adjustment cartridge 88 (FIG. 3) in the valve body 68. The cartridge communicates with a passage 90 (FIG. 4) extending to the internal surface of the valve body 68. The passage 90 communicates with a passage (not shown) extending through the valve housing 70 and connected to the conduit 26 supplying the oven standing pilot 22.

Similarly, the standing pilot 40 is supplied by a passage 92 communicating with a flow adjustment cartridge 94 and a passage 96 terminating at the internal surface of valve body 68. This passage communicates with a passage (not shown) extending through the valve housing 70 and connected to the conduit 42 supplying the standing pilot 40.

Flow of fuel between the inlet passage 56 and the

passages

60 and 66 is controlled by the manual valve 50 and specifically by rotation of the valve rotor 80. The valving surface 78 of the rotor 30 is provided with a valve port or slot 98 (FIGS. 2 and 5-7) selectively engageable with the valve recesses $617,600 and 66a.

In order to rotate the rotor 80 through operation of the knob 54, the knob is mounted on a stem 100 journaled for rotation in a top cap 102 and sleeve 104 (FIG. 2). The inner end of stem 100 is fixed to a rotor drive yoke 106 having a finger 106a engageable with a slot 108 in the rotor 80. The valve faces 76 and 78 of the body 68 and the rotor 80 are held in sealing engagement by means of a spring 110 held in compression between the yoke 106 and a retainer 112.

In order releasably to lock the control in both off positions, the yoke 106 includes a finger l06b releasably engaged in a slot 114 in the top cap 102 by the force of the spring 110 when the control is moved to the normal off position. In addition, the cap 102 includes an additional slot (not shown) receiving the finger 1116b in the additional off position. To move the control from either off position, the handle is pushed inwardly against the force of the spring 110 and rotated in order to free finger 1116b. This construction assures that the control cannot accidentally be turned from either off position and the standing pilots and 40 cannot be accidentally extinguished.

Having reference now more specifically to FIGS. 5-7, the positions of the manual valve 50 and knob 54 are illustrated for different settings of the control 12. In the normal off position (FIG. 5) the slot 56b of the inlet passage 56 is in COI'III'I'IU'.

nication with the slot 98 of the valve rotor 80. The valve face 76 of the rotor 80 seals the slot 60a of the passage 60 so that fuel is prevented from flowing into the cavity 58 and thus is prevented from flowing to either the safety valve 28 or the control pilot 20. However, the valve recess 98 does communicate with the slot 66a of the passage 66. As a result, in the normal off position fuel is permitted to flow to the standing pilots 22 and 40.

When the knob 54 is moved to an operating position such as the position illustrated in FIG. 6, fuel is permitted to'flow to the control pilot 20 and safety valve 28 in addition to the standing pilots 22 and 40. More specifically, the slot 56b of the inlet passage 56 communicates with the recess 98 in the rotor 80, which recess communicates simultaneously with the slot 611a of the passage 60 and with the slot 66a of the passage 66. Consequently fuel is admitted not only to the standing pilots but also to the cavity 58 from which it may flow to the safety valve 28 and control pilot 20.

An important feature of the present invention resides in the provision of an additional off position (FIG. 7) wherein fuel is prevented from flowing to any of the burners in the oven. In this position slot 56b of the inlet passage 56 communicates with the recess 98 in the rotor. However it should be noted that the valve surface 78 of the rotor 80 seals both the slot 60a of the passage 61] and the slot 66a of the passage 66. Consequently, fuel is prevented from flowing to the standing pilots 22 and 40 and from flowing by way of the cavity 58 to the safety valve 28 and the control pilot 20.

Movement of the knob 54 to the operating position also serves to condition the thennostatic valve 52 to maintain a selected oven temperature. Whena baking temperature is selected, the thermostatic valve 52 serves to cycle the flow of fuel to the control pilot 20 while continuously making available a full flow of fuel to the safety valve 28. This is accomplished by operation of a valve member 116 cooperating with a valve seat 118 surrounding the inlet end of the passage 62 leading to the control pilot 20. The passage 62 is best shown in FIG. 4 and includes a first portion 62a extending to a flow adjustment cartridge 120 (FIG. 3). The cartridge communicates with a passage segment 62b extending to the interior surface of the body 68 and this passage communicates with an additional passage (not shown) extending through the valve housing 70 to the conduit 24 supplying thecontrol pilot 20.

Conversely, when a broil operation is selected, the control pilot 21) is supplied continuously with fuel and a valve member 1211 cooperates with a valve seat 122 to throttle the flow of fuel through the passage 64 to the burner 18 by way of the safety valve 26. In addition, the valve member 120 and seat 122 serve to limit the oven temperature to a broil temperature in event of a runaway condition such as might be caused, for example, by failure of the valve member 116 fully to engage the seat 118 during baking operation.

In order thermostatically to control the operation of the valve 52 in accordance with oven temperature, the tube 38 leading from the oven temperature sensing bulb 36 communicates with an expansible diaphragm 124 mounted within the chamber 58. A diaphragm nib 126 carried by the diaphragm 124 includes a shaft 128 supporting the valve member 120. The spacing between the valve member 120 and the seat 122 in the cool condition of the oven is adjusted so that the member 120 and seat 122 cooperate to throttle the flow of gas through the passage 64 when the oven temperature reaches a desired high broil temperature.

Control of the flow of gas to the control pilot 20 is also accomplished by the diaphragm 124. The diaphragm nib 126 engages a first lever 129 which in turn engages a second lever 130 extending between a pivot 132 and the valve member 116. The operating pivot of the lever 129 is established by engagement of the lever with a pivot plate 134 normally resting on a shoulder of a temperature control shaft 136. A spring 136 normally holds the plate 134 against the shoulder, but is capable of compressing to provide an overtravel action in the event that the diaphragm 124 expands after the valve member 116 has engaged the seat 116.

Manipulation of the knob 54 conditions the thermostatic valve 52 to maintain the oven temperature at a desired level during baking operations. Rotation of the knob from the off position to an operating position serves to move the temperature control shaft 136 in an axial direction thereby to adjust the pivot point of the lever 126. More specifically, a pin 146 extends through the shaft 136 and rides in a slot in a fitting 142 attached to the valve stem 11111. When the stem is rotated, the shaft 136 is caused to reciprocate by virtue of a threaded portion 136a engageable with a threaded opening 144 in the valve body 63.

When the knob 54 is moved to a position corresponding to a baking temperature, such for example as the position illustrated in FIG. 6, the pivot point of lever 129 is moved upwardly as viewed in FIG. 2 thereby permitting a spring 146 to move the valve member 116 away from the seat 118. Fuel then flows to the control pilot 20 and is ignited by the standing pilot 22 whereupon the safety valve 26 opens to admit gas to the burner 18 and cause an increase in oven temperature.

When the oven temperature reaches the selected level, diaphragm 124 expands to move valve member 116 against seat 118. In order to provide for stable operation of the valve member 116 against the small seat 116, the inner surface of the body 68 is provided with a ridge 143 against which the valve member may rest. Upon a decrease in oven temperature, contraction of the diaphragm 124 moves the valve member 116 away from the seat 11% again to permit fuel to flow to the control pilot 20. In this manner the flow of gas to the burner 18 is cycled in order to maintain a selected baking temperature.

When the control is moved to select a high temperature broil operation, the pivot point of the lever 126 is moved to such an extent that the valve member 116 does not engage the seat 118 at the temperature at which the valve member throttles flow through the valve seat 1122. Consequently in broil operation, or in a runaway condition, the valve member 120 and seat 122 take over the controlling function and provide a modulated flow of gas to the burner to maintain a broil temperature.

In the event that a single tube pilot such as the pilot illustrated schematically in FIG. 8 is used with the control, the valve recess 66:: (FIGS. 3, 5 and 7) may be communicated directly with the passage 62 leading from the valve seat 1111, and both of these passages may be coupled in common to the conduit 46 supplying fuel to the dual rate pilot 44. The operation of the system is substantially identical regardless of which pilot system is used.

In the event that it is not desired to control an additional burner such as the standing pilot burner 46, it will be apparent that the flow adjustment cartridge and passages supplying this pilot may be either closed or eliminated from the control 12.

We claim:

1. An oven control for use with a main burner, a standing pilot means, a control pilot means, and a safety valve for admitting gas to the main burner in response to a flame indication at the control pilot means, said control comprising a manual valve having an inlet for connection to a fuel a first outlet adapted to communicate with the standing pilot means and a second outlet adapted to communicate with both the control pilot means and the safety valve, a knob movable to a range of operating positions whe rein both said outlets communicate with said inlet, and thermostatic valve means controlled by the knob setting to control at least a portion of the flow through said second outlet in accordance with sensed oven temperature, said knob being movable to an off" position wherein said second outlet is blocked, and said knob being movable to an additional of position wherein both said outlets are blocked.

2. The oven control of claim 1 further comprising means for releasably detaining said knob in said first-mentioned off position.

3. The oven control of claim 1, an additional gas-utilizing device, and said first outlet of said manual valve being adapted to communicate with said additional gas utilizing device.

4. The oven control of claim 1, said control including a housing having a cavity therein, said second outlet communicating with said cavity, first and second passages extending from said cavity and adapted to communicate with said control pilot means and with said safety valve, and said thermostatic valve means including means for controlling flow through said passages.

5. A control for use in a gas range of the type including a standing pilot means, a control pilot means disposed in ignition transfer relation to said standing pilot means, a main burner disposed in ignition transfer relation to at least one of said pilot means, a safety valve connected to control the admission of gas to said main burner, and flame responsive means connected to said safety valve and disposed in heatsensing relation to said control pilot means for opening said safety valve only in response to a sensed flame indication at said control pilot means, said control comprising:

a control knob movable to first, second and third positions;

thermostatically and manually operated control valve means operatively connected to said control knob for controlling the admission of gas to said safety valve and to said standing pilot means and to said control pilot means in accordance with knob position;

said control valve means admitting gas to said safety valve and to said standing pilot means and to said control pilot means in the first position of said control knob;

said control valve means admitting gas to said standing pilot means while preventing the flow ofgas to said safety valve and to said control pilot means in the second position of said control knob; and

said control valve means preventing the flow of gas to said safety valve and to said standing-pilot means and to said control pilot means in the third position of said control knob.

6. The control of claim 5, said knob being movable from said second position in one direction to said first position and from said second position in the other direction to said third position, and means releasably detaining said knob in said second position for preventing inadvertent movement of said knob between said first and third positions.

7. In combination, a gas range including a standing pilot means, a control pilot means disposed in ignition transfer relation to said standing pilot means, a main burner disposed in ignition transfer relation to at least one of said pilot means, a normally closed safety valve connected to control the admission of gas to said main burner, flame responsive means connected to said safety valve and disposed in heat-sensing relation to said control pilot means for opening said safety valve only in response to a sensed flame indication at said control pilot means, and an improved control comprising a housing having an inlet and having a cavity therein, a first outlet from said cavity adapted to be communicated with said control pilot means and a second outlet from said cavity adapted to be communicated with said safety valve, a thermostatically controlled valve in the path of gas flowing through said first outlet for selectively admitting gas to said control pilot means in accordance with range temperature, a first passageway in said housing for admitting gas to said cavity, a second passageway in said housing adapted to be communicated with said standmg pilot means, a manually operated valve for controlling flow from said inlet to said first and second passageways, and a common operator connected simultaneously to control both said thermostatically and manually operated valves, said operator being movable to a range of first positions wherein said thermostatically operated valve is adjusted for operation at a selected temperature and both said first and second passageways are in communication with said inlet, said operator being movable to a second position wherein said first passageway is blocked and said second passageway is in communication with said inlet, and said operator being movable to a third position wherein both said first and second passageways are blocked.

8. The combination of claim 7, said manual valve comprising a valve surface on said housing, a rotor having a face sealingly engageable with said valve surface, said operator being connected to rotate said rotor, first, second and third spaced slots in said valve surface communicating respectively with said first and second passageways and said inlet and a recess in said rotor face for registration with said slots in said positions of said operator.

9. A control for use in a gas range of the type including a standing pilot means, a control pilot means disposed in ignition transfer relation to said standing pilot means, a main burner disposed in ignition transfer relation to at least one of said pilot means, a safety valve connected to control the admission of gas to said main burner, and flame responsive means connected to said safety valve and disposed in heatsensing relation to said control pilot means for opening said safety valve only in response to a sensed flame indication at said control pilot means, said control comprising:

a control knob movable to first, second and third positions;

said control valve means admitting gas to said standing pilot means while preventing the flow of gas to said control pilot means in the second position of said control knob; and

said control valve means preventing the flow of gas to said standing-pilot means and to said control pilot means in the third position of said control knob.

Claims

1. An oven control for use with a main burner, a standing pilot means, a control pilot means, and a safety valve for admitting gas to the main burner in response to a flame indication at the control pilot means, said control comprising a manual valve having an inlet for connection to a fuel a first outlet adapted to communicate with the standing pilot means and a second outlet adapted to communicate with both the control pilot means and the safety valve, a knob movable to a range of operating positions wherein both said outlets communicate with said inlet, and thermostatic valve means controlled by the knob setting to control at least a portion of the flow through said second outlet in accordance with sensed oven temperature, said knob being movable to an ''''off'''' position wherein said second outlet is blocked, and said knob being movable to an additional ''''off'''' position wherein both said outlets are blocked.

2. The oven control of claim 1 further comprising means for releasably detaining said knob in said first-mentioned ''''off'''' position.

5. A control for use in a gas range of the type including a standing pilot means, a control pilot means disposed in ignition transfer relation to said standing pilot means, a main burner disposed in ignition transfer relation to at least one of said pilot means, a safety valve connected to control the admission of gas to said main burner, and flame responsive means connected to said safety valve and disposed in heat-sensing relation to said control pilot means for opening said safety valve only in response to a sensed flame indication at said control pilot means, said control comprising: a control knob movable to first, second and third positions; thermostatically and manually operated control valve means operatively connected to said control knob for controlling the admission of gas to said safety valve and to said standing pilot means and to said control pilot means in accordance with knob position; said control valve means admitting gas to said safety valve and to said standing pilot means and to said control pilot means in the first position of said control knob; said control valve means admitting gas to said standing pilot means while preventing the flow of gas to said safety valve and to said control pilot means in the second position of said control knob; and said control valve means preventing the flow of gas to said safety valve and to said standing-pilot means and to said control pilot means in the third position of said control knob.

7. In combination, a gas range including a standing pilot means, a control pilot means disposed in ignition transfer relation to said standing pilot means, a main burner disposed in ignition transfer relation to at least one of said pilot means, a normally closed safety valve connected to control the admission of gas to said main burner, flame responsive means connected to said safety valve and disposed in heat-sensing relation to said control pilot means for opening said safety valve only in response to a sensed flame indication at said control pilot means, and an improved control comprising a housing having an inlet and having a cavity therein, a first outlet from said cavity adapted to be communicated with said control pilot means and a second outlet from said cavity adapted to be communicated with said safety valve, a thermostatically controlled valve in the path of gas flowing through said first outlet for selectively admitting gas to said control pilot means in accordance with range temperature, a first passageway in said housing for admitting gas to said cavity, a second passageway in said housing adapted to be communicated with said standing pilot means, a manually operated valve for controlling flow from said inlet to said first and second passageways, and a common operator connected simultaneously to control both said thermostatically and manually operated valves, said operator being movable to a range of first positions wherein said thermostatically operated valve is adjusted for operation at a selected temperature and both said first and second passageways are in communication with said inlet, said operator being movable to a second position wherein said first passageway is blocked and sAid second passageway is in communication with said inlet, and said operator being movable to a third position wherein both said first and second passageways are blocked.

9. A control for use in a gas range of the type including a standing pilot means, a control pilot means disposed in ignition transfer relation to said standing pilot means, a main burner disposed in ignition transfer relation to at least one of said pilot means, a safety valve connected to control the admission of gas to said main burner, and flame responsive means connected to said safety valve and disposed in heat-sensing relation to said control pilot means for opening said safety valve only in response to a sensed flame indication at said control pilot means, said control comprising: a control knob movable to first, second and third positions; thermostatically and manually operated control valve means operatively connected to said control knob for controlling the admission of gas to said safety valve and to said standing pilot means and to said control pilot means in accordance with knob position; said control valve means admitting gas to said safety valve and to said standing pilot means and to said control pilot means in the first position of said control knob; said control valve means admitting gas to said standing pilot means while preventing the flow of gas to said control pilot means in the second position of said control knob; and said control valve means preventing the flow of gas to said standing-pilot means and to said control pilot means in the third position of said control knob.