US1606987A

US1606987A - Oven-heat regulator

Info

Publication number: US1606987A
Application number: US673953A
Authority: US
Inventors: Emil L Claus
Original assignee: Milwaukee Gas Specialty Co
Current assignee: Milwaukee Gas Specialty Co
Priority date: 1923-11-10
Filing date: 1923-11-10
Publication date: 1926-11-16
Anticipated expiration: 1943-11-16

Description

Nov. 16 1926. 1,606,987

E. L. cLAUs OVEN HEAT REGULATOR Filed NOV. 10; 19 23 4 Sheets-Sheet l Nov. 16 1926.

.E. L. CLAUS OVEN HEAT REGULATOR Filed Nov. 10. 1923 4 Sheets-Sheet 4 V M H m w Patented Nov. 16, 1926.

U'NlT STATES PATNT. orrica.

EMIL L. CLAUS, OF MILVVAU'KEE, WISCONSIN, ASSIGNOR, BY DIRECT AND.MESNE AS SIGNMENTS, T MILWAUKEE GAS sPEcIALTYscofMPANY, OF MILWAUKEE, WIS- CONSIN, A CORPORATION OF 'WISCONSIII.

OVEN-HEAT REGULATOR.

Application filed November 10, 1923. Serial No; 873,953.

This invention relates to certain new and useful improvements in oven heat regulators capable of use on kitchen stoves, ranges and any other device' where it is desired to maintain a predetermined degree of heat in a compartment such as an oven or any other .space. i

Various types of oven regulators have been designed and are on the market and while they apparently function to some degree of certainty and' accuracy, the are objectionable from the stove manu acturers standpointin that they require specialpiping and fittings," materially increasing the cost of 1n- 'stallation, and furthermore they are diificult to install on gas stoves not arranged for their installation at the time of manufacture.

Having this in mind, it is an objectof my. invention to provide an oven heat regulator which eliminates thenecessity of roviding' special piping and fittings material y simplifying its application to an oven or other chamber. or compartment to beregulated, re-

ducin the time, labor and material required, and acilitating its ready application to stovesnow in use or to stoves at the timeof their manufacture.

Another feature which is objectionable in the oven heat regulators now on the market: is that they are not designed to meet all stove construction, and it is, therefore, another object of this inventionto provide an oven heat regulator which is capable ofi-application to all types of stoves without" requiring cated within the oven to be influenced by the special fittings or arrangements.

Another feature which is objectionable int the types of oven heat regulators now on the" market is, that special cratingmust be provided for the shipment of the stove so equipped in that they project or protrude from the oven and means must be provided to properly accommodate and 'protect the same.

This invention, therefore, contemplatesas another ofits objects to rovide a the -mo; static instrument which stove, which is accommodated in the standard crates of the various manufacturers and, therefore, the requirement of special crating is eliminated.

oes not protrude. from the oven beyond ,the stringerfof the the device to serious objections on the part of the stove manufacturers, the users and the fire underwriters, and this invention has for another of its objects to provide an oven heat connected from the oven,'thus insuring an increased factor of safety in the operation thereof and eliminating the necessity of snug fittings and packing glands such 'as are necessary with the other devices in order to reduce the possibility of the gas passing into the oven to a minimum.

Another objectionable feature of the ther- -mostatic devices of. the character described now or. the market is that they employ one or more springs actin against a thermostatic member which tages in that after continued use, the spring 'regulator'in which the gas is absolutely disas many disadvane 'crystallizesand loses its strength throwing the instrument out as far as accuracy is concerned and furthermore the sprlng is gen- .erally affected by the heat of the oven resultof this invention resides in the provision of a thermostatic member having a high co-eificient of expansion and 10 heat therein and acting against a-member having a' low co-efiicient of expansion and located outwardly of the oven within a neutral zone whereby the positiveness of the operation of the device is increased.v Another object of this invention resides in the provision of means permitting the circulation of air through the thermostatic member having a high co-eiiicient of ex ansion,-whereby the same quickly respon s to changes in temperature to thus increase the 'sensitiveness of the instrument.

Another object of this invention is to pro vide means for circulating air through the member having a low co-efiicient of ex ansion to prevent its being influenced by eat radiated from the oven and to thus increase the efliciency and accuracy of the instrument.

Another object of this invention resides in the provision of a rotatable actuating dial requiring but one turn or less to adjust the instrument from minimum to maximum heat.

'Another object of this invention resides in the provision of a device having a compound dial whereby the regulator may be adapted for use with either artificial or natural gas without requiring any change in the construction thereof.

Another object of this invention resides in the provision of a device, the thermostatic member of which works against the solid cast iron front of the oven to thus insure accuracy of operation.

In thermostotic instruments for controlling oven temperatures, it is essential that an adjustable pilot light be provided and heretofore considerable difficulty has been experienced'in that the adjustment for the pilot light has been from a remote point resulting in frequent extinction of the pilot inasmuch as the gas pressure is reduced by expansion in the pilot supply tube or pipe and it is, therefore, another object of this invention to provide an improved pilotstructure wherein the adjustment of the volume of gas supplied thereto is made at the pilot tube.

Another object of this invention resides in the provision of apilot light having means located at the pilot tip, but operable from a remote point, for adjusting the pilot li ht.

Another object of this invention resides in the provision of a valve structure including telescopng tube members actuated from a thermostatic member influenced by the oven temperature, whereby the necessity of a snug leak-proof fit between the valve members is eliminated and, consequently, the necessity of lubricating the parts and the occurrence of sticking avoided.

It is another object of this invention to provide a thermostatic instrument for regulating the temperature of an oven having several means of adjustment all of which are in convenient places exteriorly of the stove .where atmospheric conditions whereby the adjustments are not influenced in any manner by the oven heat.

Another object of this invention resides in the provision of a device of the character described wherein the action of the member influenced by the oven heat is direct, wherethe provision of a thermostatic instrument for regulating the temperature of an oven in which it is unnecessary to penetrate the oven slde walls thus eliminating the consequent prevail increase in losses due to crackin of the enamel such as is encountered in t 1e manufacture of stoves where it is necessary that the side oven panels be penetrated in order to permit the instrument to enter the oven.

The prerequisites for a thermostatic mstrument to meet all prevailing conditions are accuracy, maintenance, economy and safety, and it is a further object of this invention to provide an instrument of the character described in which all of these essential features are incorporated.

A still further object of this invention resides in the provision of a device which has provision for. horizontal, vertical and universal adjustment between it and the shut-off cock for the oven whereby the device may be readily adapted to any stove irrespective of the relation of the oven to the oven control valve. I

And a still further object of this invention resides in the provision of a device of the character described wherein the drilling of only a small hole in the front and rear oven walls and the substitution of a special valve for the conventional oven shut-oil cock isrequired for its application to any make of oven.

With the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

In the accompanying drawings, I have illustrated one complete example of the physical embodiment of my invention, and a modification thereof, constructed according to the best modes I have so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a perspective view of a portion of a gas stove or range illustrating the application thereto of an oven heat regulator embodying this invention;

Figure 2 is a side View of the controlling valve looking in the plane of the line 2-2 of Figure 3, the medial portion thereof being broken. away, and but a portion of the oven front frame being illustrated;

Figure 3 is a sectional view taken vertically throughthe valve structure at right angles to Figure 2 on the plane of the-line 3-3 thereof;

Figure 4 is a detail view, partly in vertical section and partly in elevation, of the lower portion of the control valve, said view being taken through Figure 7 on the plane of the line 4-4;

Figure 5 is a view in top plan illustrating the thermostatic members for actuating my device, the medial portion thereof being broken away and the oven wall and the guard or covering for the forward ends of said members being in section;

Figure 6 is a detail view of the adjustable pilot for the oven burner, said View being partly in section and partly in' side elevation, and taken through Figure-,3 on the plane of the line 66;

Figure 7 is a view, partly in section and partly in; top plan, taken through Figure 2 on the plane of the line 77 Figure 8 is a detail sectional view illustrating the by-pass for insuring the maintenance of a minimum flame at the oven burner, said view being'taken through Figure 7 on the plane of the line 8-8;

Figure 9 is a fragmentary sectional view taken on the plane of the line 9-9 of Figure 7, and

Figure 10 is a view similar to Figure 2 with the lower portion thereof broken away and in section and illustrating a slightly modified construction of valve in which a reciprocal sleeve is employed in lieu of the 'rotating sleeve of that embodiment illustrated in Figures L to 8, inclusive.

Referring now more particularly to the accompanying drawings, in which like nu merals designate like parts throughout. the several views, the numeral 10 designates a heating oven which is provided at its front with the usual door 11 communicating with the space 12 or oven proper, the oven may be of either the single or double wall type and has a front frame 13 surrounding the opening closed by the door. 11 and which is of sturdy material, such as cast iron, steel or the like, and extends along the top sides and bottom of the oven door opening and is suitably connected with the framework 14 of the range proper. The oven is heated by a burner 15, illustrated by dotted lines in' Figure 1, of any desired design or construction and connected with a stringer pipe 16-, mounted at the forward portion of the frame 14, through a gas cock 17, to be later more specifically d scribed, and a manifold 18.

The rig-id ame-work 13 of the oven is of such construction as to have practically no contraction or expansion under the ranges of temperature at which the ordinary oven is operated and on this frame-work my improved oven heat regulator or instrument is mounted. The upper, inner corner of the frame-work has a small opening or aperture 19 therein through which the forward short 'end 20 of a tubular thermostatic member 21 having a relatively high co-eflicient of expansion projects, the rear end 22 of said member being projected outwardly through an opening 23 in the rear oven wall. The forward end 20 of member 21 is rigidly secured to the frame 13 by a pair of clamp nuts 24 engaging the opposite sides thereof -sleeve valve member 27. The valve member 27 is preferably tubular and has its upper portion rotatably journaled in a, cap 28 closing the upper end of a housing 29, the lower end of Whichis threaded in a base member 30 in register with a recess 31 therein. The lower end of the valvemember 27 is disposed in the recess" 31 and is rotatable over a normally stationary valve member 32- which is 'adjustably mounted in the base member. provided with complementary ports or

openings

33 and 34, respectively, adapted to align Thevalve

members

27 and 32 are and'disalign'upon rotation of the member 27, in the manner hereinafter described. I

The base member 30 is firmly secured to i the frame-work 13 by a strap or bracket 1 member 35, see Figures 1, 2, 3, 7 and 10,

whereby the unit is rigidly secured to the J frame-work of the oven by the members 25 and 35with the rear ends of the member 21 and 36'free of the oven. As will be readilyobviousthe member 21 is influenced by the heat within the oven 12 and expands or contracts as the oven temperature raises or falls and this contraction or expansion is imparted to the valve member 27 through a member 36 having a relatively low co-efficient of expansion and towhich the member 21 has its end 22 firmly secured .by a connecting member 37. The member 36 is preferably disposed outwardly of the oven in a' neutral zone and out of the range of the influenceof the oven heat and has its forward end 38 directed inwardly and flattened, as at 39, for pivotal connec tion between the adjacent bifurcations of a crank member 40 by a removable pivot pin' 7 4 1. The crank 40 is fixed tothe trunnion 26 and has two complementary ends to permit the application of the instrument to either a right or left hand oven without requiring special parts.

The forward end ofmember 21 being made fast to the rigid frame 13 of the oven and the rear end thereof being rigidly connected with the member 36, converts the longitudinal contraction and expansion of the member 21 to rotary motion at the valve member 27, aligning and disaligning the

ports

33 and 34 to vary the volume of gas flowing therethrough, as hereinafter described. l

The member 30 is provided with a central bore or well 41 int-he upper end thereof communicating with recess 31 and a recess a2 in the lower portion of the base member.

41, while the collar 44 is loose on the eXten-' sion 45 and being adjusted, by a spring 48 confined between a washer 49 secured to the extreme lower end of the-member 32 by a screw 50 and the collar member. The upper face of the collar member is preferably counter-bored to receive a circular boss or enlarged portion 51 on the under-face of the base member. i

The gas cock 17 is of special construction, the gas instead of flowing directly from the stringer 16 to the manifold 18, flows first through the control valve hereinbefore described, thence back through the gas cock and into the manifold. This is accomplished by providing the gas cook with auxiliary outlet and

inlet ports

52 and 53 respectively,

whereby movement of the gas cock plug 54 by its handle 55 to open position registers the port 52 with the stringer 16 and the port 53 with the manifold 18. The auxiliary outlet port 52 has a coupling tube 56 connected therewith, in which one end of an extensible tube 57 is telescoped and adjustably secured therein by a binding cap or head 58 threaded over the end of tube 56. The head 58 has a port 58' adapted to ride over the outer tapered'end 59 of the tube 57 to secure the same in adjusted position in tube 56 to prevent the leakage of gas therepast. The other end of tube 57 is adjustably telescoped in one endof an 'L-coupling 60' and adjustably secured therein by a head 58 and the other end of the L-coupling has one end of a tube similar to the tube 57 adjustably telescoped therein, the other .end of which is adjustably telescoped in a coupling 61 communicating with the recess 42, said second tube 57 having its endsadjustably secured in the

couplings

60, and 61 by heads 58.

' A coupling 62 leads from the recess31 and has one end of a tube 57', similar to the tube 57, telescoped and adjustably secured therein by a head or cap 58, the other endof-which is telescoped and adjustably secured in one end of an L-shaped-tube or coupling 63 by a head or cap 58. The other end of coupling 63 has one end of a second tube 57 telescoped and adjustably secured therein by a head or cap 58', the other end of the second tube 57 being telescoped and adjustably secured in a coupling tube 56' connected with the auxiliary inlet 53.

An opening of the valve plug 54 permits the gas to flow from the stringer 16 throu h the outlet 52 to the recess 42, thence into t e interior of the valve member 32, through ports 64 therein, through

ports

33 and 34, if the same are in alignment, into the interior of the housing 29, thence into the recess 31, through

tubes

62, 57, 63, 57 and 56', the

inlet port 53, manifold 18 and thence to the facilitates the regulation of the volume of gas supplied the burner through the by-pass.

The valve member 32 is normally stationary and the valve member 27 is rotatedby the expansion and contraction of member 21, to align and disalign the

ports

33 and 34 to maintain a flame at theburner sufficient to keep the oven temperature at any predetermined degree which may be set by adjusting the normally stationary valve member 32. Valve member 32 is rotated to any desired position of adjustment by a setting screw 68 threaded in a lug or ear 69 on the base 30 and having its inner end abutting a projection or lug 70 formed on the collar member 44, said screw being provided with a knob or adjusting wheel 71 on its outer end. The lug 70 is yieldably maintained in engagement with the inner end of the screw 68 by a spring pressed plunger 72,mounted in the bore of a lug or car 73 carried by the base 30 diametricallyv opposite ear 69, between which and a removable cap 75 a spring 74 is confined. The spring pressed plun er 72 in addition to maintaining the lug 0' and the screw 68 in engagement at all times maintains all play or lost motion to one side to thus increase the accuracy of the'instrument. Y

The knob 71 is readily adjustably secured to the screw shaft 68 by aset screw 71' and carries a cylindrical dial or disc 76 provided on its periphery with two sets of figures 77 and 78, see Figure 4, for artificial and natural gas, respectively. 'To prevent confusion, a shield member 79 is provided which is movable to cover either one of said sets of figures. As is well known in the art, natural gas has a higher B. t. u. than artificial gas,thus requiring a lower-volume of gas to maintain a set degree of heat in the oven when natural gas is used and a greater volume to maintain any set degree of heat 'When' artificial gas is required, For this reason the compound dial is employed and the shield 79 moved to cover up the artificial reading when the device is used for natural gas, and vice versa. But one turn of the knob 71 is required to operate the instrument from minimum to maximum heat and the dial carries a stop 72 which cooperates 5 with a stop 73 carried by the base member to prevent rotation of the knob more than one turn.

Three means are provided for setting the instrument after the same has been applied toa stove, one, the connecting member 37,

which is preferably in the form of an adjustable clamp, another. the collar member 44: and the other the set screw 71. After the instrument has been applied to the oven, the burner is ignited and after-the oven has become heated a thermometer reading is taken. Assume the thermometer reading to be three hundred degrees, either the connecting member 37 may be loosened and the knob 71 rotated to align the designation 300 with a pointer 80 carried by the base member and the connecting member then made fast again; the binding screw 47 of the collar member loosened and the knob 71 rotated to align the designation 300 with the pointer 80 and the screw 47 then turned to make the collar member fast to the screw shaft 68, or the set screw 71 loosen and then tightened to make the knob 71 and its dial fast to the screw shaft 68. All of these adjustments are located exteriorly of the oven out of the range of the oven heat and are made under atmospheric conditions rendering them absolutely accurate.

As an added factor of safety against extinction of the burner, a pilot is provided, as best illustrated in Figure 6. The'pilot comprises a tube 85, the outer end of which is connected with the coupling 60, as at 85',

and the inner end of which is in the form of a pilot tip 81, preferably constructed of Monel, or other similar metal. The pilot tip has an orifice 87 therein at which a pilot flame burns and the size of the pilot flame is adjustable from the front of the oven by a knob 82 from which a flexible shaft 83 leads having a threaded enlargement 84 on its inner end in threaded engagement with the pilot tip. Anextension or needle valve member 86 of Mon'el or other similar metal pro'ects from the enlargement 84 to the ori ce whereb the area of the orifice may be readily ad uSted to regulate the size of the pilot flame. The enlargement 84 is longitudinally grooved to permit the flow of gas thereby and the adjusting of the orifice opening by the means illustrated insures the to maintenance of the proper pressure at the pilot and prevents a variance in the pilot in the event the shaft 83 is effected by temperature changes as its contraction and expansion is rearwardly of the needle ,valve member 86.

The upper end of the valve structure proper and the outer ends of the

members

21 and 36 are preferably enclosed in a housing 88 and the outer-most portion of said housing has a fiat surface inclined with respect to the perpendicular and provided. with various figures representing the degrees of heat to the side which is delineated the use for which the oven is adapted at such degrees to assist the operator in setting the device. As for example, should the operator desire to set the oven for baking bread, a glance at the top of the housing 88, discloses that 400 degrees is the temperature required and the knob 71 is rotated to align the 400 degree designation of the dial 76 with the pointer 80.

With the oven thus set for 400 degrees, the gas cook 17 is opened and the burner 15 ignited. The oven being practically cold and the member 21 fully contracted

ports

33 and 34 are in full alignment and the burner 15 supplied with the volume of gas necessary to burn at full maintenance. As the temperature of the ovenapproaches 400 degrees, the member 21. rotates, the valve member 27 through the neutral member 36 gradually closing the opening of

ports

33 and 34, thus diminishing the supply of fuel to't-he burner in proportion to the increase in the temperature of the oven.

To insure the instant response of the instrument to any slight variation in the temperature of the oven the

members

21 and 36 are preferably tubular, having their rear ends open to the atmosphere and their forward ends provided with relatively small openings 89and 90, respectively, permitting the constant passage of air therethrough. The circulation through the

members

21 and 36 is from the rear to thefront, as the openings at the rear are ofa greater area than those at the front. The'circulation of air through the member 21 is accelerated by temperature changes taking place within the oven. The air passing through mem ber 36vassists in maintaining it at a constant temperature and the air passing through the member 21 insures its instant response to any drop in temperature in the 115 oven, as will be readily apparent.

This construction absolutely eliminates 'the use of springs against which a thermostatic member must work, as is the case in the majority of thermostatic oven heat regulators now on the market and eliminates a valve member in which the force of gravitymust be contended with. Furthermore the gas is at all times kept out of the oven.

In Figure ,10 a slightly modified construction is illustrated in which the

members

27 and 32 vertically reciprocate instead of rotate. The setting of the device is accomplished by the screw 68 engaging against one arm 91-of a bell crank lever 92 pivotally 1B0 meager mounted, as at 93, to the base member, the influenced by the heat of the oven, means other arm 93 of which is ivotally connected with the lower end of he member 32, as at 94. The member 32 in this embodiment of my invention, is normally urged outwardly of the base member by a spring 95 confined between a flange 96 on the lower end thereof and the wall of the base member to maintain the bell crank arm 91 in constant engagement with the inner end of the screw 68. v

In this form of my invention, the member 36 converts the contraction and expansion of member 27 into reciprocal movement by having its end 38 pivotally connected, as at 97, with one arm of a bell crank lever 98 pivoted, as at 99, to the cap 52. The other arm of the bell crank is pivotally connected, as at 100, with the upper end of the trunnion 26 which is slidably extended through the cap member 25. As the'operation of this form of'my invention is substantially identical with that illustrated in Figures 1 to 8,

inclusive, further description thereof is drawn perpendicularly through the outermost portion of the stringer. As a result,

' it is unnecessary to make special provision in the crating of the stoves for shipment, thus effecting an economy in material and labor in the cratin and facilitating the general handling of t he stove.

' Furthermore, the control of the gas flowing to the 'oven burner 15 being directly from the gas cook 17 eliminates special fittings and long lengths of pipe, producing an economy in material and labor in the manufacture and application of the control andmaterially simplifying its installation, inasmuch as it is only necessary to provide a small aperture in the frame 13 anddn the rear oven wall and replace the conventional gas cock of the oven burner with the special; gas cock illustrated,

The telescoping and

adjustable tubes

57 and 57 make it possible to apply the instrument to either right or left hand stoves without any change in their construction and provide for universal adjustments laterall and vertically and at various angles, eliminating the necessity of providing means to insure positive truing'of the various parts during installation.

What I claim as my invention is:

1. In a device of the character described including an oven having a substantially rigid frame at one side and a burner for heating the interior thereof, means for regulating the flow of fuel to the burner in proportion to the temperature of said oven and including a member having a relatively high co-eiiicient of expansion and adapted to be connecting one end of said member with said rigid oven frame, the other end of said member being passed outwardly of the oven, a second member having a relatively low coefficient of expansion and positioned in a neutral zone out of the influence of the heat of the oven, means connecting the second member with the first-mentioned member, a control valvefor regulating the flow of fuel to the oven burner, and a connection between.

heating the interior thereof, means for regu- 1 lating the flow of fuel to the burner in proportion to the temperature of said oven'and including a member having a relatively high co-eificient of expansion and adapted to be influenced by the heat of the oven, means connecting one end of said member with said rigid oven frame, the other end of said member being passed outwardly of the even, a second member having a relatively low co-eliicient of expansion and positioned in a neutral zone out of the influence of the heat of the oven, means adjustably connecting the second member with the first-mentioned member, a control valve for regulating the flow of fuel to the oven burner, and a connection between said control valve and said second member whereby expansion of .said first-mentioned member decreases the flow of fuelto the burner and contraction of said first-mentioned member increases the flow of fuel to said burner.

a 3. In a deviceof the character described including an oven having a substantially rigid frame at one side and a burner for heating the interior thereof, means for regulating .the flow of fuel to the burner in proportion to the temperature of said even and including a member having a relatively high co-eflicient of expansion and adapted to be influenced by the oven heat, means connecting one end of said member with said rigid oven frame, the other end of said member being passed outwardly of the oven, a second member having a relatively low co-eflicient of expansion and positioned in a neutral zone out of the influence of the heat of the oven, means connecting one end of was first-mentioned member decreases the flow of fuel to the burner and contraction of said first-mentioned member increases the flow of fuel to said burner.

v 1. In an applianceof the character de-. scribed including an oven, a burner for the oven and av valve for regulating'the flow of .fuel to the burner, a thermostatic member the interior of said oven, and means permitting thecirculation of air fromthe exterior of'said oven through said tube whereby said q the temperature of theoven.

tube member instantly responds to a fall in '6. In an appliance of the character described including an oven, a burner therefor and a valve for regulating the flow of fuel to the. burner, a thermostatic member for actuatin saidvalve and including a tubular mem er having a relatively 'high 00- efiicient of expansion and positioned within the interior of the oven, means permitting the circulation ofalr through said member, a second tubular member mounted exteriorly of the oven and having a relatively low co-eflicient of expansion, means connectin the second'member wlth the first-mentioned 7 member, means connecting said second member with the burner control valve, and means permitting the circulation of air through said second member whereby the temperature thereof is maintained substantially con stant. i a

7.111 a device of the character described including an oven and a burner for heating the same, a valve member for controlling the flow of fuel to said'burner, a member dis-' posed within the oven and having a relatively high co-efiicient of expansion, a second member disposed; exteriorly of the oven and having a relatively low co-eficient of expansion, means connecting said; members wherebyexp'ansion and contraction of said first member shifts both of said members in the same plane, and a connection between said second member and-thecontrol vailve whereby movement of said secondrmember ,actuates thecontrol valve.

8. In a device of the character described I including an oven and a burner for heating the same, avalve member for controlling the flow of fuel said burner, a member disposedwithinthe oven and having a relatively high {co-efficient of expansion, a second member-disposed ,exteriorly of the oven and having a.relatively low coefiicient of expansion, 'means connecting said members .whereby expansion and contraction of said first member sh1fts the. second member, a

connection between said, second member and the control valve whereby movement of said secondmember actuates the control valve, and means permitting the circulation of air through said second member whereby the same is maintained at a substantially constanttemper'ature."

9. A device of the character described, comprising an oven, a burner therefor, a source of fuel, a pair of freely rotatable telescoping tubular valve members, a liousing enclosing said tubular members, ports in said tube members adapted tic-register, means connecting the interior of one member with the source of fuel and the interior of the housing with the burner, whereby the volume of fuel supplied the burner is controlled by said'ports, and means actuated by a rise or fall in the temperature of the oven to open and close said ports to regulate the flow of fuel to said burner.

10. A device of the character described,

comprising an oven, a burner therefor, a

source of fuel, a pair of telescoping tubular .valve members, a housing enclosing said tubular members, ports insaidtubular members adapted to register, means connecting the interior of one member with the source 'of fuel and the interior of the housing with the burner, whereby the volume of fuel supplied the burner'is controlled by said ports, means actuated by a rise or fall in the temperature of the oven to move one of said telescoping members and open or close said ports to control the volume of fuel supplied the burner through said ports, andmanually actuated means for adjusting the other of said telescoping members. r

11. In an appliance of the character described including an oven, a burner and a fuel supply therefor, means for adjustably connecting the burner with its fuel supply and including a valve member, a member dis osed in the oven and having a relativeigh co-eficient of expansion, the forward end of said member being projected through the oven front wall and the rear end of said member being projected through the rear wall of the oven, means connecting the forward end of said member with the valve member, a second member positionedexteriorly of the oven and having a relatively low co-efiicient of expansion, means connecting the rear endof said second memberwith the rear end of the first member, and means connecting the forward endof said second member with the valve member and telescoping whereby expansion or contraction of said first-mentioned member shifts the second member and actuates the valve member.

12. In a gas stove having an oven, a burner for the oven and a gas cock for connecting the same to a gas supply, said gas cock having two inlets and two outlet ports,

'one outlet port being connected with the comprising an oven, a burner therefor, a-

source of 'fuel, a pair of freely rotatable tubular valve members, a

housing enclosing said members, ports in said tube members adapted to register for the passage of fuel therethrough, means.

connecting the interior of: one member with the source of fuel and the interior of the housing with the burner whereby the volume of fuel supplied to the burner is controlled before flowing to the meager one valve member with respect to the other,

- and automatic means actuated by a rise and fall of the temperature within the oven for moving the second valve member with respect to the first to open and close said ports, v

14. A device of the character described including an oven, a burner therefor, a source of fuel supply and a valve for connecting the burner with the supply, a bypass through which the fuel pass prior to its passage from the valve to the burner, a valve positioned within said by-pass for controlling the flow of iuel'to the burner, said valve including a stationary casing having therein a manually adjusted valve portion, a second valve portion fitting over the first said vaive'portion, ports in said valve portions adapted to register for the passage of fuel therethrongh, and automatic means positioned within the oven and connecting to one of said vah'e portions for controlling the flow of fuel to the burner on the rise and fall of the temperature with- ,in the oven.

In testimony whereof I afix my signature.

EMIL L. CLAUS.