US1704487A - Controlling valve and system embodying the same - Google Patents

Description

Mar 5, 1 F. w. ROBERTSHAW ET AL 1, 8

CONTROLLING VALVE AND SYSTEM EMBODYING THE SAME Filed March 24, 1926 4 Sheets-Sheet 1 I II INVENTORS March 1 2 F. w. ROBERTSHAW ET AL CONTROLLING VALVE AND SYSTEM EMBODYING THE SAME Filed March 24, 1926 4 Sheets-Sheet %NVENTZR$ March 1929- F. w. ROBERTSHAW El AL 1,704,487

CONTROLLING VALVE AND SYSTEM EMBODYING THE SAME Filed March 24, 1926 4 sheets-sheet 5 in! i, m

March 1929. F. w. ROBERTSHAW ET AL 1,704,487

CONTROLLING VALVE AND SYSTEM EMBODYING THE SAME Filed March 24, 1926 4 Sheets-Sheet 4 lyza Patented Mar. 5, 1929 UNITED PATENT OFFICE.

FREDERICK W. ROBERTSHAW, OF PITTSBURGH, AND GEORGE A. ROBERTSHAW, OF

GREENIBURG, PENNSYLVANIA, ASSIGNORS TO ROBERTSHAW THERMOSTA'I. COM- IPANY, OF YOUNGWOOD, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

CONTROLLING VALVE AND SYSTEM EMBOIJYIN G THE SAME.

Application filed March 24, 1926. Serial No. 96,977.

The present invention relatesibroadly to the art of burner systems and control valves therefor, and more particularl to an improved thermostatic control va ve and oven system in which the same is embodied.

At the present time it is customary in the .general art to which the present invention relates to utilize thermostatic control valves on domestic ovens. In some cases, the entire structure is positioned within the oven so that it is necessary to open the door to control the same, while in other-cases, the thermostatic element is projected into the oven through one of the walls thereof with the valve casing and the piping exteriorly positioned with respect to the oven. While both of the above types of installations possess features of merit, it has been found to be highly desirable to provide a form of control which .may be applied to any oven after all of the piping is in position, and in which all of the parts, with the exception of the control casing, are concealed by the oven. In accordance with the present invention such an improved type of control and installation is made possible.

Other objects of the present invention are to provide a more attractive oven structure by reason of the concealed gas pipes, and to provide an installation in which the thermostatic valve may be quickly applied, removed or replaced as may be desired.

Still another object of the present invention is to provide a control installation of such character that linings within the oven can be easily replaced without the necessity of a special lining structure as required in casings where difficulty is encountered in the removal of the thermostat.

In the accompanying drawings there are shown, for purposes of illustration only, certain preferred embodiments of the present invention, it bein understood that the drawings do not define the limits of our invention, as changes in the construction and operation disclosed therein may be made without departing either from the spirit of the invention or the scope of our broader claims.

In the drawings- Figure 1 is a top plan view, largely diagrammatic, of a range embodying the im proved control;

Figure 2 is a partial front elevation, largely diagrammatic, of the range shown in Figure 1, certain of the parts being broken away for the purpose of illustrating a portion of the interior construction; I

Figure 3 is an end view in Figures 1 and 2;

Figure 4: is a perspective view, partly broken away, of the improved control shown in Figures 1 and 3;

Figure 4 is a plan view showing a form of cover plate adaptable for use with the construction of Figure 4.

Figure 5 is a view similar to Figure 4 showing a slightly modified'form of control with union connections;

Figure 6 is a rear elevation of the Valve casing;

Figure 7 is a vertical sectional view on the line VIIVII of Figure 6 looking in the direction of the arrows;

Figure 8 is a transverse sectional view on the line VIIIVIII of Figure 7 looking in the direction of the arrows;

Figure 9 is a front elevation of a special double L fitting; I

Figure 10 is a bottom end view of the fitting of Figure 9;

Figure 11 is a longitudinal sectional view through a form of nipple suitable for use with the control structure of Figures 4 and 6 to 10, both inclusive;

Figure 12 is a perspective view illustrating a modified form of connection; and

Figure 13 is a detail sectional view illustrating in detail the advantages of the use of a compression nipple as shown, for example, in Figure 11.

In carrying out the present invention, which is adaptable to ranges and ovens of any desired construction, there'may be taken any suitable range comprising the usual burner manifold 2 for supplying the hot top portion 3 of the range, and having an oven structure 4 at one end. The oven may comprise the usual upper portion having a door 5 to the oven proper and lower portion having a door 6 to the broiling compartment. Within the broiling compartment may be located any desired form of burner 7, as is customary in the art, the present invention having to do particularly with an improved arrangement for supplying gas to such burner.

During the construction of the range by the manufacturer, there may be suitably positioned therein the burner 7 in the broiling of the range shown compartment, and also a thermostat element 8 in the oven compartment. This thermostatic element, together with the valve casing used in connection therewith and to be later described, may be of any desired construction, but are conveniently of the general structure disclosed in our Patent No. 1,455,663 of May 15, 1923. The heat responsive portion of the thermostat may be suitably secured in the oven in any desired position as by a supporting bracket 9, one end of the element being so mounted as to project outwardly through one wall of the oven 1n position to cooperate with the valve casin 10. Positioned within the oven between the inner wall 11 thereof and the outer wall 12 through which the thermostat projects, is a fitting 13,"he'rein illustrated as comprising a casting, shown more in detail in Figures 4, 9 and 10, and constituting in effect a double L. The fitting 13 has a. threaded inlet connection 14 and a threaded outlet'connection 15. Threaded into the inlet 14 is one end of a pipe 16 extending upwardly between the walls 11 and 12 of the oven so as to be concealedfrom view, the lower end of this pipe having suitable connection with the manifold 2, preferably through a shut oif valve 17 The threaded outlet connection 15 has screwed there into a second pipe 18, preferably located similarly to the pipe 16 and havingeconnection at its, lower end to the Bunsen tu 19 which supplies the burner 7. After all of the desired connections are made, the fitting 13 may be rigidly held in place by roviding a cover plate 12 and passing a suitable bolt 20 (Figure 2) through the cover plate and outer wal 12 of the oven and into the threaded lug 21 provided on the fitting 13. This forms a rigid mounting in which substantially all of the parts are concealed, and in which the concealed parts are in position to have the valve casing applied thereto. The cover plate is illustrated in detail in Fi ure 4*, and is adapted to be placed outside oi. the enameled side wall of the oven to give a finished appearance and also to permitthe pipes 16 and 18 and the double L casting to be secured in place before application of the thermostat.

By reference more particularly to Figures 9 and 10 of the drawings, it will be noted that the threaded inlet 14 communicates with an opening 22 having a tapered inner end adapte to cooperate with the correspondingly shaped end of a nipple 23, as shown in Figure 11. This nipple may be of suitable material adapted under compression to form a tight joint with the fitting. The threaded connection 15 communicates with a similar opening 24 adapted to cooperate with a nipple of the same character. After the range has been completely constructed as before described, and' either before or after it leaves the manufacturer, nipples 23 may be placed in each of the openings 22 and 24, and these nipples at their outer ends slipped into similar openings 25 and 25'. respectively in an extension 26 carried by the casing 10, the openings 25 and 25' having their axes substantially parallel to the longitudinal axis of the casing and substantially normal to the faces of the casing. These openings have inclined seats 27 adapted to cooperate with the tapered ends of the nipples 23 whereby when the casin 10 and the fitting 13 are drawn toward eac other, tight joints for'the flow of gas will be established. This drawing toether of the parts may1 be accomplished by a rawbolt 28 passing t rough an opening 29 in the extension 26 and engaging the threaded opening 30 in the fitting 13. It will be apparent that this construction permits the thermostatic casing to be quickly applied and removed without the necessity of removing any portion of the permanent piping system of the oven, and at the same time it enables the,

use of a piping system which is, to a large extent, concealed within the oven walls.

The valve casing 10 has a threaded projection 31 on the rear face thereof adapted to cooperate with the revolving couple or adaptor 32 carrying a control handle 33 as shown,.

for example, in our patent referred to. Within the casing is a suitable seat 34 for a valve 35, the casing being provided with any desired type of bypass, not shown, and bypass controlling means 36.

An usual form of pilot may be provided, the pilot preferably being supplied with fuel through a connection 37 (Figure 1) with the outlet of the valve 17.

With the foregoing construction, it will be apparent that the operation of the thermostat. will be effective for controlling the supply of fuel from the manifold 2 to the burner 7, the pilot supply being of such nature to insure a constant flame for lighting the burner at such times as gas is again supplied by the thermostat after a period during which it has been cut oil.

In some cases it may be desired to eliminate the special fitting 13 and utilize separate Us 13' as shown, for example, in Figure 5. Such Ls may be used with any form of union embodying suitable nipples 38 and a connection 39. With such a construction, the tightening of the connections 39 will draw the extension 26 on the valve casing 10 toward the Us until the unions are tight.

In Figure 12 there is illustrated in perspective still another form of the invention adapted to be used either in lieu of the com pression nipples or the unions. This may comprise a right and left nipple having an intermediate shoulder 40 of suitable angular configuration to permit tightening of the nipples. Where such nipples are used, the left hand threads will be adapted to cooperate with the valve body and the right hand By merely tightenin the nipples, the valve body and the Us wil be drawn together.

In Figure 13 of the drawings there is illustrated in detail, and more or lessdiagrammatically, a form of connection embodying the compression nlpple of Figure 11, this figure illustrating the adaptabllity' of the connection in question to different systems whether embodying a thermostat or not, and whether handling gases or liquids.

In this figure there is indicated a fitting 42 and a fittlng 43 which it is desired to connect. Each of these fittings is illustrated as having a plurality of threaded openings 44 adapted to receive pipes or the like, each of the threaded openings communicating with a seat 45 tapered to cooperate with the correspondingly tapered end of a compression nipple 46. As before pointed out, these nipples may be of any desired material, such for example, as copper, whereby they are adapted to partially form their own seat and prevent leakage when sufficient pressure is applied thereto. This pressure may be applied in any desired manner as for example by a bolt 47 extending through the connections 42 and 43 whereby they may be readily drawn together. In this manner a tight connection may be quickly established without the necessity of relative rotation between the parts. This enables one part of a. system to be completely installed and another part of the system to be subsequently added thereto.

Vith all of the forms herein illustrated, there are combined the advantages of concealed pipes, adding to the beauty of the range, possibility 0 quick removal of the thermostat valve in case replacement thereof is necessary, and quick application of the thermostat at the point desired, the thermostat being the last part which it is necessary to apply. The construction also lends itself to ready removal of the thermostat to permit replacement of linings within the oven, thereby obviating the necessity of providing other means for the removal of the linings as has heretofore been required where the removal of the thermostat is accompanied by difiiculties.

We are aware of the fact that it has heretofore been proposed to provide a construction having concealed pipes, but we are not aware of the use of concealed pipes with an exposed thermostatic valve casing, although pipes hidden in rear of the range have been used. This combination has been found extremely desirable, as the location of the valve casing insures quick reduction in gas-temperature, both by heat conduction and radiation. The gas passing through the pipes 16 and 18 is obviously heated, but it has been demonstrated that, irrespective of the temperature at which the oven is operating, the temperature within the valve head does not exceed 310 F. This is below the oint at which organic sulphides in the gas reak up into inorganic sulphides, within a safe margin, it having been shown that the gases can be safely handled in this manner at temperatures below 350 F.

The structure herein disclosed, in so far as it pertains more particularly to fittings adaptable to other uses, is made the subject matter of and claimed in our copending appgi2c1tion Serial No. 322,926, filed Nov. 30, 1

A further advantage of the present invention arises from the fact that the user of the range is enabled to use the cooking top burners for boiling and frying, even in the event it is necessary to remove the thermostatic valve or in the event of failure of this valve to operate. If desired, in such cases,.

the thermostat may be bodily removed and a return bend'fitting slipped into place either on the threaded or the compression nipples. In such case, the temperature within the oven would be manually controlled by the valve 17.

Still another advantage arises from the use of the special double L fitting inasmuch as such a fitting is very shallow, permitting its use with ovens having a relatively narrow flue space therein. Also due to the fact that this fitting can'be rigidly secured in place, it will be ap arent that connection in many cases would e more easily made therewith than is possible with the separate elbows as shown in Figure 5.

We claim:

1. In a fuel control system, an oven having fuel pipes concealed therein, heat responsive means within the oven, and a control casing for said heat responsive means exteriorly of the oven.

2. In a fuel control system, an oven-having fuel pipes concealed therein, heat responsive means within the oven, and a control casing for said heat responsive means exteriorly of the oven, said casing being bodily removable with said pipes in position.

3. In-a fuel control system, an oven, fuel pipes concealed by said oven, a common fitting for said pipes, means for attaching said fitting to the oven, heat responsive means within the oven, and a control casin bodily removable from said fitting with said pipes in position. v

4. In a fuel control system, an oven having therein heat responsive means and fuel pipes, and means exteriorlv of the oven and carried thereby for cooperation with said pipes and said heat responsive means.

5. In an oven, an inner wall, an outer wall, fuel pipes between said walls, fitting means for said pipes, and a thermostatic valve casing exteriorly of said oven and communicating with said fitting means.

6. In an oven, an inner wall, an outer wall,

fuel pi es between said walls, fitting means for sai ipes, and a thermostatic valve casing exteriorly of said oven and communicating with said fitting means, said valve casing being bodily removable from said fitting means with said pipes in position.

'7. In a fuel control system, an oven having therein heat responsive means and fuel pipes, and means extcriorly of the oven for cooperation with said pipes and said heat responsive means.

8. In a fuel control system, an oven having fuel pipes concealed therein, heat responsive means extending through one of the oven walls and having an exterior control casing, and a cover plate cooperating with said pipes.

9. In combination with a chamber to be heated, the chamber havinga wall, a burner, a thermostat lying in the chamber and extending through an opening in said wall, a.

valve operated by the thermostat and lying in a casing disposed outside the chamber, the casing having a wall facing thev chamber wall and having fuel inlet and outlet openings therein, fuel pipes leading to and from the valve structure, the fuel pipes lying within the chamber and having portions terminating in substantial alignment with the fuel inlet and outlet openings in the valve casing wall, and means for drawing the inlet and outlet pipes and the valve casing toward one another, whereby fuel connections between the fuel inlet and outlet pipes and the valve casing are established.

10. In combination with a chamber to be heated, the chamber having a wall, a burner, a thermostat lyingin the chamber and extending through an opening in said wall, a valve operated by the thermostat and lying in a casing disposed outside the chamber, the casing having a wall facing the chamber wall and having fuel inlet and outlet openings therein, fuel pipes leading to and from the valve structure, the, fuel pipes lying within the chamber and having portions terminatin in substantial alignment with the fuel inlet and outlet openings in the valve casing wall, nipples lying between the ends of said pipes and the fuel inlet and outlet openings, and means for drawing the valve caslng toward the chamber so as to form compression joints through the nipples.

11. In combination with a chamber to be heated, the chamber having a wall, a burner, a thermostat lying in the chamber and extending through an opening in said wall, a valve operated by the thermostat and lying in a caslng disposed outside the chamber, the casing having a wall facing the chamber wall meager;

and having fuel inlet and outlet openings therein, fuel pipes leading to and from the valve structure, the fuel pipes lying within the chamber and terminating in a sun le fitting arranged inside the chamber wal and in substantial alignment with the-fuel inlet and outlet openings in the valve casing wall nipples lying between the single fitting and the inlet and outlet 0 enings in the valve casing, and means for rawing the valve casand having fuel inlet and outlet openings therein, fuel pipes leading to and from the valve structure, the fuel pipes lying Within the chamber and terminating in a single fitting arranged inside the chamber wall and in substantial alignment with the fuel inlet andoutlet openings in the Valve casing wall, nipples lying between thesingle fitting and the inlet and outlet openings in the valve casing, and means threaded into said single fitting for drawing the valve casing toward the I chamberv so as to form compression joints.

through the nipples.

13. In combination with a chamber to be heated, the chamber having a wall, a burner,

a thermostat lying in the chamber and extending through an opening in said wall, a valve operated by the thermostat and lying in a casing disposed outside the chamber, the casing having a wall facing the chamber wall and having fuel inlet and outlet openings therein, fuel pipes leading to and from the valve structure, the fuel pipes lying within the chamber and terminating in a single fitting arranged inside the chamber wall and in substantial alignment with the fuel inlet and outlet openings in the valve casing wall, a cover plate on the outside of the chamber wall and having openings corresponding with openings in the chamber wall, means connecting the cover plate and the single fitting, nipples lying between the single fitting and the inlet and outlet openings. and means for drawing the valve casing toward the chamber so as to form compression joints through the nipples. y

In testimony whereof we have hereunto set our hands.

FREDERICK W. ROBERTSHAW. GEORGE A. ROBERTSHAW.

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