US1878937A - Oven heat regulator - Google Patents

Description

Sept. 20, 1932. o. J. LEINS ET AL 1,878,937

I OVEN HEAT REGULATOR Filed Aug. 12, 1929' 4 Sheets-Sheet 1 Spt. 20, 1932. 0 LElNs ET AL 1,878,937

OVEN HEAT REGULATOR 4 Sheets-Sheet 3 Filed Aug; 12, 1929 Sept. 20, 1932. o. J. LEI-NS ET AL OVEN HEAT REGULATOR Filed Aug. 12, 1929' 4 Sheets-Sheet 4 Patented Sept. 20, 1932 UNITED STATES PATENT oFFicE OSCAR J. LEINSAN HOWARD G. RAWLINGS, OF MILWAUKEE, WISCONSIN, ASSIGNORS TO CLAUS MANUFACTURING 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN OVEN HEAT REGULATOR Application filed August 12, 1929. Serial No. 385,424.

Our invention relates to oven heat regulators and has for its primary object the provision of an improved device adapted for installation in an oven, particularly as embodied in modern domestic ranges, as an assembled unit. Secondly, it is the further object of our invention to provide a structure which may be installed and supported on the range in a simple manner and without the aid of extra supporting devices.

Oven heat regulators of the general type to which our invention relates comprise means for controlling the heating medium, that is, the gas, oil or electric current and a thermally operated device which actuates the controlling means. It is desirable forobvious reasons, to mount the thermally'responsive device in the oven in such a Way and at such a place that its action will be indicative of the prevailing temperature therein, and, for various reasons it is desirable to mount the controllng mechanism in a remote position to facilitate connection in the heating system and to reduce the piping or wiring. 7

It is also desirable to remove the controlling mechanism from the relatively hi h heating temperatures. Accordingly, thet ermally responsive device is properly mounted within the oven itself while the controlling device is located in proximity to the heating means and its supply.

The relationship between. the thermally responsive device and the controlling device is obviously of primary importance. Thatis,

the actuating member of the controlling device should always be in predetermined rela ter of appropriately supporting the assembly in its proper place.

It is well known that oven heat regulators must be capable of hand control for the purpose of selecting particular temperatures for particular purposes and that the means provided for this purpose is preferably located onthe outside of the oven. The structure of our invention contemplates the inclusion of such a selective device .in the unit assembly to which we have referred, and, as will appear, this'selective device is mounted upon the extension in close proximity to the thermostatic element.

In addition to the advantages above pointed out, the simplicity in which a heat regulator may be installedin a range is particularly marked in the structure which We have devised. The controlling device is supported from elements already necessarily in the range and the thermally responsive device issupported from the controlling device. Further advantages in this connection will factory example of the present invention.

An improved feature of our invention is that form of structure which we have devised whereby it may be installed in the range by the simple expedient of passing it in endwise through an opening which is subsequently closed by one portion of the device and per-,

mitting-another portion of the device to be disposed in another opening, from which position the connections, both for the purpose of support and for the purpose of conducting the heating medium, are made.

It would appear that certain features of our invention are useful in any oven, be the heating medium gas, oil, or electric current. Certain features of our' invention are further particularly adaptable to ovens heated by gas or oil, and still further features are particularly adapted to gas ovens. The appended claims are drawn accordingly, and, since we contemplate our invention as relating specially to gas ovens, and since all of its features are useful therein, we have shown our regulator described herein as particularly relate to a gas heated oven.

Moreover, we show a device which we have actually built and used and in which novelty is found in its narrow as well as its broad aspects.

The invention is illustrated in the accompanying drawings, in which Fig. l is a perspective view of a gas range showingone embodiment of this invention in connection therewith;

Fig. 2 is a fragmentary vertical section through the oven wall taken on the line 22 of Fig. 1 and showing the regulator unit assembly in elevation;

Fig. 3 is a vertical section through the regur lator unit assembly on the line 33'of Fig. 6';

Fig. 4; is a fragmentary detail section taken on the line 4-4 of Fig. 3;

Fig. 5 is a fragmentary on the line 5-5 of Fig. 3; V

Fig. 6 isan elevational view of the back or rear side of the regulatorunit assembly;

Fig. 7 is a fragmentary view showing, in front elevation, the temperature selecting dev ce;

Fig. 8 is a horizontal section taken on the line 88 of Fig. 3;

Fig.9 is a horizontal section taken on the line 9.9 of Fig.6;

Fig. 10 is a fragmentary detail section taken on the line 10-10 ofFig. 6;

Fig. 11 is a vertical section through the oven wall showing the manner of installing the regulator unit assembly;

Fig. 12 is a fragmentary elevation of the inner side of the oven wall,-also showing the manner of installing the regulator'unit assembly; and

Fig. 13 is a perspective view of an oven partially broken away and showing another embodiment of the invention.

In the drawings, the gas range, designated in its entirety at 5, has an oven 6 provided with a wall 7 and with a door opening having door means 8.

The gas supply pipe is indicated at 9 and the oven is shown as having a mixing head 10. The oven burner is indicated at. 11 and the gas is delivered from the pipe 9 to the head 10 and through this head to the burner 11. The head 10 has the usual air admission openings indicated at 13 and the connection from the pipe 9 is through a connecting tube designated in its entirety at 14, which tube has a nipple l5 deliverin through the head 10 to the burner. The tu -e 14, or some other equivalent connection between the supply pipe and the oven burner is an element already necessarily in the range. This element may vary widely, and this and the other parts above referred to may be of any suitable form, those shown completing the necessary disclosure of an illustrative gas heated oven in which the present invention is adapted to be embodied.

The supply of gas to the oven burner 11 is adapted for hand control by a valve 16,

detail section taken which may be of conventional or other form, which valve 16 is adapted to open or close the gas supply to the burner 11, as well as to manually vary the amount of gas supply from closed to full open position.

The tube 17 (Fig. 2) connects the head 10 with the burner 11.

In the illustrated embodiment of the invention, the wall 7 is the inner side wall of the oven 6, but it is to be understood that the regulator of the present invention may be arranged in some other wall of the oven or chamber, the heat of which it is desired to regulate. The invention is adapted for embodiment in an oven having an inner wall with a surrounding space or in an oven without such an inner wall and without such a surrounding space. In other words, the present invention is adapted for use in a wide variety of oven structures.

The regulator designated in its entirety at 20 comprises an assembled structure consisting of a controlling device 21, an extension 22 and a thermallyoperated device 23 connected to actuate the controlling device 21 and constituting with said controlling device 21 and 'extension 22 a unitary assembly in which the thermally operated device 23, controlling device 21 and actuating connection, designated in its entirety at 24, may be accurately brought into proper relationship and calibrated at the factory and the device thereafter installed as a unit assembly without altering the relationship of the parts.

A selecting device 25 is also preferably carried on the extension 22 to constitute a unitary part thereof, and this selecting device is adapted for adjusting the thermally operated device for the purpose of selecting the temperature which the device is adapted to maintain within the oven as desired.

The selecting device is shown as being supported upon the extension 22 with the controlling device 21'.

In the illustrated embodiment of the invention, the thermally operated device 23 in cludes a spindle housing 28 which may be in the form of a metal casting having an internally threaded transverse opening 29 at its upper end and an internally threaded longitudinal opening 30 at its lower end and an intermediate portion 31 generally cham nel-shaped in transverse section. The adjusting device includes a dial spindle 32 which has threaded engagement in the opening 29. Toward its outer end the spindle 32 has an integral shoulder or flange 33, and outwardly of the shoulder 33 the outer end 34 of the spindle is adapted to receive a knob 35, the spindle end 34 being splayed on opposite sides at-36 or otherwise suitably formed, and the opening in the knob 35 being correspondingly formed so that when the knob 35 is mounted upon the end of the spindle it will be splined to turn the spindle 32 with it. The

knob 35 is clamped in place by a dial screw 37 which threads into an internally threaded axial opening in the outer end of the spindle.

The dial 38, which is of circular cupped formation, has an axial opening 39 through which the spindle end 34 is adapted'to pass, this opening being small enough so that the spindle portion of the dial will be clamped firmly between the shoulder 33 and the knob 35 when the screw 37 is tightened to clamp the knob 35 and dial 38 firmly in place against the shoulder 33. v

For the purpose of holding the dial 38 in its proper calibrated position and against turning about the spindle, vibration or shakeproof washers 40 are preferably provided, one being interposed between the shoulder 33 and one side of the central part of the dial 38 about the opening 39 and the other being interposed between the knob 35 and the opposite side of the dial. These washers 40 have serrations 41 about the openings therethrough, and the small cars formed by these serrations are struck out of the plane of the washer sufiiciently and preferably. from both sides to provide a firm gripping action be tween the parts between which they are interposed.

The spindle housing 28 has an externally threaded nipple 45 extending outwardly, and

coaxial with the opening 29 and clamped against the upper end of the housing 28 at the inner end of this nipple 45 is a cover plate 48. The cover plate is clamped against the housing in this manner by a nut 46 threaded upon the nipple 45. The sides of the nipple 45, adjacent the mounting of the cover plate thereon, are preferably splayed or of other irregular formation at 58, and the opening through the cover plate is preferably c0rrespondingly formed to hold the cover plate against turning upon this nipple. The cover plate 48 may be of sheet metal and is shown as of circular or disc form with the central opening fitting over the splayed portion of the nipple 45.

The outer marginal edge of the rover plate 48 is preferably offset or dished outwardly slightly at 49 for a purpose whichwill hereinafter appear. and an integral lug 50 is turned outwardly from the top of the cover plate and forms a pointer or indicator for cooperation with the dial scale or calibrations 51. i

For the purpose of tying the thermally operative device or the upper end of the unit assembly to the oven wall 7, a pair of tying tangs 53 are struck out forwardly from the cover plate 48 and are adapted to be brought into the opening 54 in the oven wall 7 in the positions shown in dotted lines in Fig. 3 and then struck or bent over outwardly against the inner surface of the wall 7 to tie the upper end of the unit assembly thereto. For i and the dial of white or other porcelain enamel. The scale 51' comprises suitable markings in terms of temperature graduated circularly about the outer surface of the dial and adapted to be brought selectively into register with the pointer 50 by turning the knob 35 to set the thermally operated device for any desired temperature. 7

For example, by setting the 250 degree marking of the scale 51 in register with the pointer 50, a temperature of 250 degrees F. will be maintained within the oven 6 by the regulator, and by turning the knob 35 to bring the 500 degree or 550 degree marking into register with the pointer 50, the inner end of the spindle 32 will be projected further inwardly, and by its cooperation with the upper end of the bi-metallic thermosatic strip 56, will set the thermally operated device to maintain a temperature of 500 degrees or 550 degrees F. in the oven. 4

A coiled spring 60 surrounding the spindle 32 and interposed between the nipple 45 and the shoulder 33 urges the dial spindle outwardly at all times so that in the event of any looseness or wearing loose of the cooperating threads on the spindle and in the opening 29 thethreads will be held'in tight cooperation in one direction. A washer 61 may be interposed between the nipple 45 and the adjacent end of the spring 60.

Theinstalled regulator may be calibrated with a standard thermometer by placing such a thermometer within the oven with the regulator in place and, in the event of any discrepancy between the thermometer reading and the dial reading of the regulator, the screw 37 may be released sufficiently to release the washers 40, so that the dial 38 may be turned free of the spindle 32 in either direction to register the scale marking 51 corresponding with the thermometer reading with the pointer 50. For example, if the thermometer reading is 425 degrees F. and the dial marking 400 degrees F. is in register with the pointer 50 in the setting of the selecting device for maintaining that temperature, this discrepancy of 25 degrees between the regulator setting and the standard thermometer reading may be corrected by releasing the screw 37 and turning the dial 38 in a clockwise direction (Figure 7), about the spindle 32 and between the washers 40 to register the dial marking 425 with the pointer 50, whereupon the dial is again clamped tightly between the washers 40 and in the desired angular position with reference to the spindle 32 by tightening the screw 37.

The controlling device 21 comprises a valve body 62 cored to provide a pair of internal valve chambers 63 and 64 separated by an integral partition 65 having a valve opening 66 therethrough. The lower chamber 64 has a downwardly opening internally threaded opening 66 closed by a cap 67 which is adapts ed. to be threaded into and from the opening 66' and which has a hexagonal flange or head 68 at its lower end which seats tightly against the bottom of the body portion 62.

The valve opening 66 is controlled by a valve disc 69 having an axially depending portion ,70 which fits in the upper reduced end of a generally conical spring 71 interposed between the valve disc 69 and the cap 67 and yieldingly urging the valve disc 69 to its seat formed by the portion of the partition 65 marginally surrounding the opening 66. The cap 67 is recessed at 72 to receive the adjacent enlarged end of the spring 71.

A pilot or lighter tube 7 4. is threaded at 75 into the valve body 62 and opens into the chamber 64 through a duct 79. The free end of the tube 74 has a pilot tip 7 7 disposed to maintain a pilot or lighter flame adjacent the burner 11. A threaded metering screw 78 threaded into the valve body and cooperable with the duct 79 leading from the chamber 64 into the pilot tube 74 is adapted for adjusting or regulating the pilot flame at will.

In the illustrated embodiment of themvention, the connecting tube 14 between the supply pipe 9 and the supply nipple 15 for the burner 11 is made in two sections. The

section leading from the supply pipe 9 leads to the valve chamber 64 and the other section leads from the valve chamber 63 to the supply nipple 15. For the purpose of always maintaining at least some supply of gas from the chamber 64 to the chamber 63, and, therefore, to the burner 11 when the valve 16 is open so that the burner 11 cannot be extinguished bythe regulator with the valve 16 open, a by-pass passage 80 connects the chambers 63 and 64.

A metering screw 81 threaded into the valve body and cooperable with the passage 80 is adapted for metering or regulating this passage and the fuel supply to the passage 63 therethrough.

The extension 22 comprising a tube. 85 threaded at its upper, end into the opening 30 of the spindle housing 28 and at its lower end into an integral hub 86 .on the top of the valve body 62 joins the valve body and the spindle housing and thermally operated device carrier into a unitary assembly.

The bi-metallic thermal sensitive member 56 and its mounting and manner of employment, as wellas the means for harnessing 1 the movement of this thermal sensitive memher and for manipulating the gas valve or controlling device 21 thereby, per. se, form the subject matter of the co-pending application of Oscar J. Leins and Clarence Wantz, Case 1, filed of even date herewith.

The thermostat strip or thermal sensitive element 56 is of bimetallic formation comprising two generally rectangular laminations 56a and 56b of different ratio expansional materials. One end of this strip 56 has an opening 90 which the reduced inner end 91 of the spindle 32 enters.

The engagement of the reduced end 91 of the spindle 32 in the opening 90 is preferably relatively loose so as not to interfere with the action of the thermostatic member 56 which is by the engagement of this reduced end 91 in the opening 90 suspended on the inner end of the spindle 32. The suspended support of the thermally sensitive member and particularly the. free suspended support of this member on the spindle 32 of the selecting device are also important aspects of this invention. Turning of the knob 35 in a clockwise direction (Fig. 7) threads the spindle 32 inwardly and the inner end of the spindle by its shouldered cooperation at 91 with the upper end of the thermalsensitive member 56 tilts this member about the pin 102 as a fulcrum in a clockwise direction (Fig.3) swinging the lower end of the thermal sensitive member against the head 44 of the rocker arm 92 which is turned in a counterclockwise direction upon its pivot 93 thereby and through the rod 95 and stem 96 moves the "alve 69 away from its seat. Turning of the knob 35 in the opposite direction threads the spindle 32 outwardly, whereupon the spring 71 moves the valve 69 toward its seat and swings the thermal sensitive member 56 in the opposite direction about-the fulcrum 102 to hold the upper end of the thermal sensitive member in cooperation with the spindle 32. In this manner turning of the knob 35 provides a valve opening corresponding with the setting of the dial 38 and thereby provides for obtaining a temperature within the oven cor- 1 the spring 71 so that the temperature for which the regulator is set will be accurately maintained.

The rocker arm 92 is j ournaled for rocking movement or oscillation upon a pin 93 and said arm 92 has a T-shaped head 94. One side of this head 94 cooperates with or abuts the lower end of the thermal sensitive element 56 and the opposite end cooperates with or abuts the upper end of a motion transmitting or conveyor rod 95. The rod 95 extends down through the tube 85 and its lower end abuts a valve pin 96, the lower end of which, in turn, engages the valve disc 69 in a recess therein as shown, and is adapted to unseat the valve disc an amount governed by the setting of the spindle or selecting device 32. With this valve disc 69 unseated in conformity with the setting of the adjusting device of the regulator, any tendency of the temperature within the oven to exceed the temperature for which the device is set will flex the thermal sensitive strip 56 accordingly and the lower' disc 69.

The pin 93 is supported at its opposite ends in integral side arms 100 on the housing member 28, and the thermal sensitive strip 56 is confined between its ends by a pin 102 extending across the back or inner side of the strip 56 and supported at its opposite ends in integral side arms 103 on the housing member 28. The valve pin 96 is provided with a bushing or bearing member 104 threaded in the ingegral hub'86 of the valve body and having a ange 105 seating against the bottom side of the top wall of the valve body with an axially depending portion 106.

The flange 105 is of hexagonal or other con.- tour to facilitate threading the bearing member into place. The upper end of the bearing member 104 is counterbored at 107 to receive and guide the lower end of the actuating rod 95.

From the foregoing, it will be apparent that the thermostat element 56, which is composed of two metals having different coeiiicients of expansion, occupies a position for functioning without binding or interfering in any way with its free warping properties. This thermostat element is floating in action and has a floating support so that its movement accurately follows the thermal variations only. This floating mounting and positioning of the thermostat eliminates any deformation in any way bywarps, bends, twists, or the like, which would introduce variables difficult to screen, out and standardize to obtain a standardized thermal action of the element. The resulting element and ts positioning and mounting provides a thermostat which is not only highly sensitive, but very accurately fol-' lows thethermal changes. The lever 92, together with the supports and fulcrums for controlling device 21. 'The result harnessing the movement of the thermal sensitive element, provides the maximum movement necessary for manipulating the is, that the valve travel speed is relatively high, assuring actuation with a shortheating period and an abrupt closing off of the gas when the desired temperature is attained, is

provided for, all without the use of reduction gears, threads or the like, the standard pitches of which are not suitable for. this purpose.

The side wall 7 of the oven has, in addition to the opening 54 already referred to, a second opening 110. The valve body 62 of the controlling device 21 is of sucha configuration that the largest dimension taken in any direction from point 150 of Figure 11 is less than the diameter of the cover plate 48,

' so that the opening 54 through which the device is installed, may be closed by the cover plate 48 which may be smaller than the dial 38 itself. The valve body 62, together with the pilot tube 74 and with the thermally operated device 23, extension 22 and selecting device 25, combined in a unit assembly,.is adapted to be inserted into the oven through the opening 54. The opening 110 is preferably positioned to locate the valve member at a point adjacent to the gas supply line to the burner 11, as well as in a zone giving free access to the different points necessary to adjust, and preferably in a position which will be relatively cool while the oven is in service.

In installing the unit assembly, as shown in Fig. 11, it may be inverted and the controlling device 21 entered through the open ing 54 in the oven wall as shown in Figs. 11 and 12. Then continuing the insertion of the controlling device end of the unit assembly, the thermally operated device at 23 of the assembly is swung upwardly through the position shown in dotted lines in Fig. 11, swinging the controlling device end 21 downwardly into theopening 110, and the thermally operated device end 23 upwardlv into the opening 54. The outer end 112 (Fig. 2 of the valve body 62 is swung through the opening 110, the valve body being preferably provided with a flange or shoulder 113 (Fig. 2) which seats against the inner side of the oven wall 7 when the regulator is installed to operative position. The outer end 112 of the valve body 62 which extends through the opening 110 to the outside of the oven is provided with the tapped openings 114 (Fig. 2) through which the respective tube sections 14, for supplying the oven burner, are connected with the valve chambers 63 and 64, as already described. The supply tube 14 for the oven burner is a necessary element of the range, and, when the sections of this tube are connected with the valve body 62, the unit regulator assembly is supported by the tube sections 14 without additional supports.

As the thermally operated device 23 is moved into the opening 54, the cover plate 48 seats against the outer surface of the oven wall 7 surrounding the opening 54 and closes this opening, the centrally dished portion of the cover plate preferably fitting into the opening, as shown in Fig. 3. As already pointed out, the tying tangs 53 move into the opening 54 in the positions shown in dotted lines in Fig. 3 and are then bent or struck out into cooperation with. the inner side of the wall 7 and tiethe upper end of the assembly firmly in place in the opening 54.

The device is thereby installed in the range in a simple manner and as an assembled unit as well as without the aid of extra supporting devices.

The thermally responsive device is disposed so that its action will be indicative of the prevailing temperature'in the oven, and the controlling mechanism is'disposed in a. remote position to facilitate connection in .the heating system without additional packing or wiring. v thermally responsive device and the controlling device is fixed in the unit assembly and this relationship may be made and the device accurately gauged at the factory. The matter of installation of the unit assembly of the present invention becomes therefore, a mere matter of appropriately supporting the assembly in its proper place. The assembly includes a selecting or adjusting device, and this device is mounted upon the extension in close proximity to the thermostatic element. The controlling device is supported from elements already necessarily in the range, namely, the supply tube sections 14, and the thermally responsive device is supported from the'controlling device. The device is installed by the simple expedient of passing it in endwise through the opening 54 which is subsequently closed by one portion of the device and another portion of the device is adapted to be disposed in another opening 110'for the purposes of support and for the conduct. of the heating medium. The dial is on the side of the oven and the'adjustment for temperature control may be made entirely on the outside of the oven, either while the oven is hot or cold. The controlling device is lo- 'cated at a point adjacent to the gas supply line and is positioned to have free access to the different points necessary and, in addie tion, is disposed in a relatively cool zone.

The oven is shown in Fig. 2 as provided with a horizontal baflieor bottom wall 120 marginally supported upon a bracket 121 secured to the wall of the oven and the baffie or bottom plate 120 and bracket 121 are notched as shown, to permit the passage of the extension 22 therethrough, it being understood that the plate 120. may be arranged The relationship between the in place after installation of the regulator. The connection between the lower end of the tube 85 and the valve body 62 has a nut 122 and the dial 38 has an integral stop pin 125 which cooperates with the pointer 50 to limit the rotation of the dial in each of its opposite controlling regulator connected between two sections and with the sections of the tubing 14' arranged to supply the gas to the forwardly located mixing head 10'. The sec tions of the tube 14, between which the valve body 62' of the controlling device is connected and upon which the controlling device is supported, are in this case angularl disposed. The oven wall is indicated at the selecting or temperature adjusting device at 25 and the regulator comprises a unit assembly as before, and is installed as explained in connection with the previous embodiment.

The opening through the oven wall 7 for the valve body 62' of the controlling device is indicated at 110'.

The invention is capable of a wide range of modification and is adapted for a wide range of uses, and we do not intend, therefore, to be limited to the particular details,

nor tothe particular use or manner of shown or described.

We claim 1. The combination with an oven having a wall of a heat regulator therefor, comprising an assembled unit consisting of an extension having a controlling device, a thermally opuse erated device and a selecting device all mounted upon said extension in precorrelated relation and constituting a unitary assembly adapted for application to the oven in unitary assembled relation and by movement of the controlling. device into and through the space inside of the oven wall.

2. The combination with an oven having a wall of a heat regulator therefor, comprising an assembled unit consisting of an extension having a controlling device, a t ermally operated device and a selecting device all. mounted upon said extension in precorrelated relation and constituting a unitary assembly adapted for application to the oven in unitary assembled relation and by movement of the controlling device into and within the space inside the oven Wall and with the selecting device continuously outside the oven.

prising a controlling device, an extension, :1

thermostatic device and a selecting device "supported with said controlling device, said extension and thermostatic device being on one side of said wall, and said selecting device on the other side of said wall, and means passing through said opening for connecting said selecting device with said thermostatic, device, said controlling device, extension and thermostatic device being capable of being passed through said opening in installation.

4. A permanently assembled structure comprising a controlling device, and an extension therefrom, a thermostat mounted on said extension, :1 selecting device also carried on said extension, said thermostat and said selecting device being adapted for disposition on opposite sides or" a. wall, and means connecting said selecting device with said thermostat and adapted for passing through an opening in said wall, said controlling device, extension, thermostat and selecting device constituting a unitary assembly adapted for application to said Wall in unitary assembled relation.

5, A permanently assembled structure comprising an extension, a thermostat mounted on said extension, a selecting device also mounted on said extension, said thermostat and said selecting device being adapted for disposition on opposite sides of a wall with the extensionon the inside of said wall, means connecting said selecting device with said thermostat and adapted for passing through an opening in said wall, said extension, thermostat and selecting device constituting a unitary assembly adapted for application to said wall in unitary assembled relation, a control device; andmeans disposed on the inner' side of the wall for transmitting the action of the thermostat to said control device.

6. A permanently assembled structure comprising a controlling device, and an extension therefrom, a thermostat mounted on said extension, a selecting device also carried .on said extension, said thermostat and said selecting device being adapted for disposition on opposite sides of a wall, and means connecting said selecting device with said thermostat and extending in-operation through an opening in said wall, said controlling device and said thermostat being passed in application of the assembled structure to the wall through the same opening through which the connecting means between the selecting device and the thermostat extends in operation.

7. A permanently assembled structure comprising a controlling device, and an'ex tension therefrom, a thermostat mounted on said extension, a selecting device also carried on said extension, said thermostat and said selecting device being adapted for disposition on opposite sides of a wall, and means connecting said selecting device with said thermostat and extending in operation through an opening in said wall, said controlling device and said thermostat being passed in application of the assembled structure to the wall through the same opening through which the connecting means between the selecting device and the thermostat extends in operation, said wall having a second opening adjacent which said controlling device is adapted to be brought in the application of said assembly for connection with a heating medium supply line.

8. In combination, an oven having an opening in the wall thereof, a controlling device,an extension therefrom, and a thermostatic device, all capable, while assembled, of being passed through said opening during installa'tion, a selecting device mounted on said extension and disposed outside said well, and means on said extension for closing said opening. 7

9. In combination, an oven having an opening in the wall thereof, a controlling device, an extension therefrom, and a thermostatic device, all capable, while assembled, of being passed through said opening during installation, a selecting device mounted on said extension and disposed outside said wall, and means on said extension "for closing said opening, said wall having a second opening and saidcontrolling device being adapted to be brpught to position adjacent said second opening for connection with a heating medium supply line and for closing said second opening. I

. 10. The combination with an oven having a wall of a heat regulator therefor, comprising an assembled unit consisting of an extension having a controlling device, a thermally operated device and a selecting device all mounted upon said extension in pre-correlated relation and constituting a unitary assembly adapted for installation of said extension and thermally operated device within the inside of the oven wall, with said extension, controlling device, thermally operated device and selecting device in unitary assembled relation, and a heating medium supply line for the oven connected with said controlling device. 7

11. In combination, an oven, a controlling device, a heating medium supply line connected with said controlling device. an extension disposed generally vertically within the oven structure and mounted on said controlling 12..In a range, the combination of means j the oven structure in assembled relation by endwise insertion of the controlling device end through said first opening, said controlling device being disposed upon complete installation in and closing said second opening and adapted for connection with said heating medium supply means 13. In combination, an oven, :1 heat regulator assembly comprising a controlling device consisting of a valve body, a valve in said body, an extension mounted on said valve body, a spindle housing mounted on said extension, a spindle having threaded engagement with said housing, a thermostat mounted upon the regulator assembly, a motion transmitting connection between the thermostat and said valve, said spindle having selecting cooperation with said thermostat at the inner side of the regulator assembly, and means on said spindle for manipulating the spindle to adjust the thermostat from the outer side of the assembly, the extension, thermostat and actuating connection between the thermostat and valve being disposed within the oven and the extension, controlling device, thermostat and selecting device being applied to the oven in unitary assembled relation. f

14.. In combination, a wall having an opening therethrough, a thermally operated device including a thermostatic element capable of passing through said opening and including a support for disposition on one side of said wall, a spindle having threaded engagement with said support, selecting means on said spindle for manipulating the spindle to adjust the thermally operated device from the opposite side of said well, and means on said support for closing said opening.

15. In combination, a wall having an opening therethr'ough, athermally operated device including a thermostatic element capable of passing through said opening and including a support for disposition on one side of said wall, a spindle having threaded engagement with said support, selecting means on said spindle for manipulating the spindle to adjust the thermally operated device from the opposite side of said wall, and means on,

said support for closing said opening, said last means comprising a cover plate having a pointer and said selecting means including a dial having a scale cooperating with said pointer, and a stop cooperating with said poipter for limiting turning movement of th 1a 16. In combination, a wall having an opening therein, a thermally operated device including a thermostatic element capable of passing through said opening and including a support for disposition on one side of said opening, a spindle having threaded engagement with said support, selecting means on said spindle for manipulating the spindle to adjust the thermally operated device from the opposite side of the wall, means on said support for closing said opening, said means comprising a cover plate, and tang's on said cover plate adapted to be passed through said opening and turned over at the opposite side of the wall to tie the thermally operated device thereto. 17. In combination, a wall having a pair of openings therethrough, a controlling valve body adapted to be passed through one of said openings, an extension on said valve body also adapted'to be passed through theopening with said valve body, a thermally operated device supported upon said extension and capable of being passed through said opening for disposition with said controlling device on one side of said wall, a selecting device carried on said extension with said thermally operated device and having manipulating means therefor,a cover plate on said extension, 'said cover plate limiting the passing of said manipulating meansthrough said opening and closing saidopening with the manipulating means disposed on the opposite side of said wall when the device is in installed position, said controlling valve be-' dium supply means, and an oven heat regulator comprising a permanently assembled structure adapted for application to the oven in unitary assembled relation by insertion of one end of the regulator through one of said openings and tilting of the unitary regu'la'tor assembly with one end so" inserted to bring the inserted end into position in proximity to one opening and the other e d into position in proximity to the other opei ing.

19. The combination with an-oven having a wall of a heat regulator for said oven, said 1 regulator conslsting of an extenslon havlng a controlling device, a thermostatic device and a selecting device all mounted upon said extension in 'pre-correlat-ed relation and constituting a unitary assembly adapted for application to said oven all in assembled relation and as a unit with the extension and thermostatic device in position inside the oven wall and the selecting device in position outside the oven wall.

20. The combination with an oven having a wall of a heat regulator for said oven, said regulator consisting of an extension having a controlling device, a thermostatic device and a selecting device all mounted upon said extension in pre-correlated relation and constituting a unitary assembly adapted for application to said oven all in assembled relation and as a unit withthe extension and thermostatic device in position inside the oven wall and the selecting device in position outside the oven wall, said extension being disposed generally vertically along the inside of the oven wall when said regulator is applied to the oven.

21. The combination with an oven having a wall of a heat regulator for said oven, said regulator consisting of an extension having a controlling device, a thermostatic device and a selecting device all mounted upon said extension in pre-correlated relation and con- .stituting a unitary assembly-adapted for application to said oven all in assembled relation and as a unit with the extension and thermostatic device in position inside the oven wall and the selecting device in position outside the oven wall, said extension being disposed generally vertically along the inside of the oven wall when said regulator is applied to the oven, the

controlling device being at the lower end of said extension when the regulator is applied to the oven and the thermostatic device being on said extension and above said controlling device.

22. The combination with an oven having a wall of a heat regulator for said oven, said regulator consisting of an extension having a controlling device, a thermostatic device and a selecting device all mounted upon said extension in pre-correlated relation and constituting a unitary assembly adapted for application to the oven all in assembled relation and as a unit with the extension and thermostatic device in position inside the oven wall and the selecting device in position outside the oven wall, said selecting device having means passing through an opening in the oven wall and operatively connected with said thermostatic device when said regulator is applied to the oven.

23. In combination, an oven having a door opening, a door for said opening, and an opening other than said door opening in a wall thereof, a controlling device having an extension extending therefrom, a thermally sensitive device, a bell crank member transmitting motion between said thermally sensitive member and said controlling device, all

capable, while assembled, of being passed through the opening other than the door opening in installation.

24. In combination, an oven having a door opening, a door for said opening, and an opening other than said dooropening in a wall thereof, a controlling device having an extension extending therefrom, a thermally sensitive member, and a bell crank member for transferring horizontal movement to vertical movement positioned between said thermally sensitive member and said controlling device, all capable, while assembled, of being passed through the opening other than the door opening during installation.

25. In combination, an oven having a door opening, a door for said opening and an opening other than said door opening in a wall thereof, a controlling device having an extension extending therefrom, a thermally sensitive device, a selecting device, a bell crank member transmitting motion between said thermally. sensitive member and said controlling device, all capable, while'assembled, of being passed through the opening other than the door opening in installation and. into position-with the selecting device extending through the opening other than the door opening. i

In witness whereof, we hereunto subscribe our names this 7th day of August, 1929.

OSCAR J. LEINS. HOIVARD C. RAWVLINGS.

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