US2308570A - Cook stove - Google Patents

Description

Jan, 1.9, 1943. A, G SHERMAN 2,308,570

COOK STOVE Filed April 4. 1940 5 Sheets-Sheet l INVENTOR. /52 V//V 6. /VEAMHM Jan. 19, 1943. A, G. SHERMAN COOK s TOVE Filed April 4, 1940 3 Sheets-Sheet 2 T N1 NK R Ef O w# T m5 A G.. @w M Patented Jan. 19, 1943 Coon sTovE Alvin G. Sherman, Grosse Pointe, Mich., assignor to Globe American Corporation, Kokomo, Ind.,

a corporation Application April 4, 1940. Serial No. 327,804

10 Claims.

This invention relates to a cook stove. More particularly the invention relates to a. novel arrangement of operating parts for the burners and oven controls of a gas cook stove. In stoves of this type it has heretofore been the general practice to place the burner and oven control elements on the front of the stove immediately beneath the cooking top. In this position the control elements are easily reached but it is difcult when working in the ordinary position close to the stove to read thefvarious indices on the control knobs. This is particularly so in the case of oven controls which must be set to dei'lnite temperature and time graduations marked on the control dials. Burner valve handles on the front of the stove are also easily reached by young children. The danger ofa child tampering with such control knobs is readily apparent.

In the present invention, all control elements for the entire stove are placed on the backrail of the stove in position to be reached without extending the arm over a cooking burner. In this position all indices may be easily read Without backing away from the stove and the burner knobs are out of reach of young children. i

One object of the invention is to provide an arrangement of elements by which the burners may be controlled by elements mounted on the backrail.

Another object of the invention is to arrange the parts in a. series of assemblies and subassemblies-such as to facilitate large scale man' ufacture and reduce the time and space required in assembling a stove.

Another object of the invention is to arrange the partsy so that the angular position of all of the control knobs for the top burners of the stove may be simultaneously adjusted With respect to the backrail. This object is obtained by a novel arrangement for mounting the burner valves on a gas manifold and by mountingthe manifold in a novel manner on the backrail.

Another object of the invention is to group the control elements for the oven in a unitary sub-assembly which may be attached as a unit to the backrail.y

Another object of the invention is generally to simplify the arrangement of control elements for a combined thermal and time control of an oven.

Other objects and features of the invention will be understood from the accompanying drawings and the following description and claims;

Fig. 1 is a perspective view of the top of a stove constructed in accordance with the invention .showing the position of the tcp burners and control elements mounted on the backrail. Fig. 2 is a rear view of the stove. Fig. 3 is a similar view on an enlarged scale of a part of 5 the apparatus shown in Fig.. 2. Fig. i is a rear view of the backrail itself with the control elements .removed therefrom. Fig. 5 is a sectional view taken on the line 5--5 of Fig. 2, the dotted lines indicating the open position of the closures and the corresponding positions of the directly associated parts. Fig. 6 is a sectional view taken on the line 6--6 of Fig. 2. Fig. 7 is a sectional view taken on the line '|-1 of' Fig. 2. Fig. 8 is a rear view of one of,` the oven control elements with parts removed. Fig. 9 is a plan view with i parts in section taken on the line 9-9 yof Fig. 8. Fig. 10 is a plan view with a part in section of a portion of the time control mechanism for the oven.

illustra ed a preferred form of the invention and referring more particularly to Figs. l and 2, there il's shown a pair of side pontoons 20 supporting'a cooking top 2|, in turn supporting a backrail 22. The backrail is preferably formed integrally with thel cooking top but may be a separate piece attached thereto if desired. An Toven, the general position of which is indicated /by a broken line 23 in Fig. 2, is mounted be- Ineath the cooking top 2| and between the side `pontoons 20. The oven is heated by a burner 24 placed beneath the same.

Air for combustion purposes may enter the oven burner space through an opening 25 (Figs. 2 and 5) in the back plate 26 of the stove. The opening 25 may be closed by a closure member 2l hinged to the back plate by hinges 28. A vent opening 29 is also provided `in the back plate 26 and connects with the interior of the oven through a passage 30 formed in the insulated wall 3| of the oven. The vent opening 29 leads to a flue 32, see Fig. 2, which conducts the gaseous products of combustion to louvres 33, see Fig. l, in the backrail of the stove. The vent 29, see Fig. 5, is closed by a closure member 34. A false louvre 35, see Fig. 1, is mounted on the opposite side of the backrail to provide a balanced appearance. At each side of the cooking top 2| there are provided top burners 36. A receptacle 3l for deep well cooking is provided on one side and is heated y'by a similar burner not shown. Between the burners on opposite sides of the stove there is provided a working space 38. A

Referring now to Fig. 4, there is shown a rear Referring to the drawings in which there isl view of the backrail and cover plate prior to assembly of control parts thereon. Holes 39 are provided to receive bolts for the attachment of the louvres 33 and 35. A central opening 48 is provided opposite which the several control elements are to be mounted. The opening 40 is closed by a cover plate 4|, the shape of which is best seen in Fig. 5 and the extent of which is indicated in Fig. 1. The cover plate 4| is spaced forwardly from the backrail 22 and is provided with individual openings 42 for the several control elements. The cover plate 4| is also provided with a pair of legs 4|a (Fig. 7) engaging the surface of the backrail 22 and receiving bolts 44 engaging holes 45 in the backrail for securing the cover plate thereto.

A gas manifold 46 consisting of a horizontal run 41 and a substantially vertical run 48 is mounted on the backrail by means shown particularly in Fig. 5. Studs 49 are welded to the manifold 46 at suitable intervals and project through holes 50 in the backrail, see Fig. 4. Washers 5| serve to space the manifold from the backrail and nuts 52 threadedly engaging the studs 49 hold the manifold in piace. Preferably two such fastenings are provided and are positioned as indicated by the holes 50 in Fig. 4. The holes are made slightly larger than the diameter of the studs 49 so that a limited rocking movement of the manifold is permitted about a horizontal axis parallel to the manifold until the nuts 52 have been tightened. r The ,vertical run 48 of manifold 48 has secured thereto by welding or otherwise, an arm 53. see Figs. 2 and 6, threadedly engaged with an adjusting screw 54 which is secured to the wall of the pontoon by a locknut 55. By loosening the locknut 55 and turning the screw 54 the spacing of the manifold from the wall of the pontoon may be varied. This movement rocks the horizontal run of the manifold and permits it to be placed in a desired angular relationship with respect to the backrail. When properly adjusted the nuts 52 and the locknut 55 may be tightened to retain the manifold in place. The lower end of the manifold 46 terminates in an elbow 55, see Fig. 2, which may be connected through a suitable opening 51 with a gas supply main, not shown.

On the underside of the horizontal run 41 of the manifold 46 there are mounted three burner valves 58, see Figs. 2 and 3, connected by detachabley union ttings to pipes 59 leading to the burners 36. A valve 69 is similarly attached to the manifold and has detachably se cured thereto a pipe 6| and a pipe 62 leading respectively to the burner and pilot of the deep well 31. Fittings 63 and 64, see Fig. 2, are secured to the manifold 46 and have detachably connected thereto pipes 65 and 66 leading respectively to the pilots of the burners 36 on opposite sides of the cooking top. Each of the valves 58 and 60 is provided with a valve stem 61 (Fig. 7) projecting through the appropriate opening 42 in the cover plate 4| and carrying a control knob 43. The control knobs 43, as best seen in Fig. l, are of the proper size and shape to hide the openings 42 and to hide the heads of the bolts 44 which secure the cover plate 4| to the backrail 22. It willbe apparent that the angular position of the knobs 43 with respect to the cover plate 4| is determined by the angular position of the manifold 46 and this in turn is determined by the adjustment of the screw 54 which retains the downward run 48 of the manifold. Thus the control knobs 43 may be properly positioned without the necessity of accurate machine work at any point in the manufacture.

The oven burner 24. see Fig. 2, is supplied with gas by a pipe 68 leading from a thermally controlled valve 69 which is in turn connected to a shutoff valve 10 by a pipe connection 1|. The valve 10 is connected to the manifold 46 by a pipe connection 12. The pipe 12 is connected at each end by a detachable union 13 and the pipe 68 is similarly connected to valve 69 by a similar union 14. The pipe 1| however is permanently secured both to the valve 69 and the valve 10. The valve 1li is mounted on a bracket 15 which is in turn secured by a pair of screws 18 (Figs. 8 and 9) to the backrail 22. The screws 16 enter the backrail through holes 11 (Fig, 4).

The shutoivalve 1U, see Fig. 8, is provided with a valve stem 18 having a contact member 19 adjustably secured to its upper end and guided in a bracket 8|) secured to the bracket 15. The contact member 19, see Figs. 2 and 3, is engageable by the face 8l of a earn 82 which is mounted on a cam stem 83 journaled in a bearing 84, see Fig. 5, secured to the bracket 15 by bolts 85. The cam stem 83 projects forwardly through one of the openings 42 in the cover plate 4| and carries a control knob 86. A compression spring 81 seated in a recess in the bearing 84 abuts against a washer 88 secured to the stern 83 and normally urges the stem and the control knob 86 to the left in Fig. 5. The cam 82 is provided with ahub 89 having a tongue 90 adapted to seat in a recess 9| in bearing 84. see Fig. 8. So long as the tongue 90 is seated in the recess 9|, the cam cannot be turned but when the knob 86 is pressed to the right against spring 81, see Fig. 5, the tongue 90 is freed from the recess 9| and the cam 82 then may be turned for the face 8| to engage with the contact member 19 and press the same downwardly as the knob and cam are turned clockwise, see Figs. 2 and 3. In the normal position of the parts, with the tongue 98 engaged with the recess 9|, the cam is out of contact with the member 19 which is held in its upward position by a suitable spring, not shown, within the structure of the valve 10. In this normal position of the parts, the valve 1D is closed. When the knob 85 has been pressed inwardly and the cam has been rotated clockwise in Figs. 2 and 3, the cam surface 8| presses the contact member 19 and valve stem 18 downwardly, as previously described, and opens the valve 1D.

The cam 82, see Figs. 2, 3 and 5, is provided with a latching face 92 adapted to engage a pin 93, see Figs. 2, 3 and 8, mounted on a latch lever 94 which is pivotally mounted at 95 (Fig. 8) on an arm 96 formed on the bearing 84. A torsion spring 91 maintains the pin 93 in contact with the face of the cam 82. When the cam 82 has been turned to fully open the valve 'l0 the pin 93 engages the latching face 92 and retains the cam and valve in the full open position. A vertically disposed bar 98, see Figs. 2, 3 and 5, is pivotally connected at its upper end to the cam 82 at 82a and at its lower end has a pin and slot connection 99, see-Figs. 2 and 5 only, with an arm |00 secured to a vertical bar |0|. The bar |0| carries a biasing weight |02, see Fig. 2 only, and is pivotally secured at its lower end to the closure member 21, see Figs. 2 and 5, and its upper end is pivotally secured to an arm |03 fastened to the closure member 34, previously described. By means of these connections the `aeoatvo and` itsrconnection to members ||0| so that axial movement'of member 82 has no eiect -on the two closures 34 .and 21. However, when 'i member 82 is rotated, the strap 98 `elevates and moves upwardly ymembers |00 and |0| as well as the weight |02 (see Fig. 2). In this elevational movement.; since closures'34 and 21 are pivoted, members |00 and |'0| must move to the dotted line position shown in Fig. 5. In so moving it will `be'observed-that of `necessity when all play in the connections is exhausted the lowerk portion of the strap 98 yields to the dotted line position. When member 82 is repositioned the several parts assume the position /shown in-Fig. l by full lines. z Note that due to the required angling of member 98 the actual elevationalmovement of pivot82a is less than the actual vertical movement of .member |00. Movement of the latch lever 94 about its pivotal mounting 95 to free the pin ,93 from the latching face' 92 permits the biasingrweight |02 to move the parts to close the air inlet and vent and vreturn the cam 82 and knob 86 to normal position, ythus also closing the valve10. f i

A push :button |04 (Fig. 1) is mounted lon a pin |05 (Figs. 8 and 9)v which is slidably guided` in an embossment |06 (Fig. 4) inthe cover plate 4 I. The pin |05 is adapted to engage an upturned portion |01 o1 a lever |08' which" is pivotally mounted on a pivot 4screw |09 secured to an angley member |0 which isin turn secured to the bracket y and in turn to backrail 22 by the prevlouslyimentioned screws 16. The lever |08 has av rearwardly projecting portion adapted to engage the' latch lever 94- and is normally held out of engagement with said lever by a tension spring ||2. By this means pressure on the button |04 moves the lever |08 about its pivotal mounting, brings said lever into contact with the latch lever 94 and then rocks, see dotted lines Fig. 9,v said latch lever upon its pivot 95 to free the pin 93 from the latching face 92 because in such movement pin 93 will move to the right in Fig. 2, thus clearing shoulder or face92 of the cam lever 82. Notethe lower endv of lever 94', see Figs.l 2, 3 and 8, moves to the left to af` fect such release. i

A clock ||3, see Fig. 3, is provided with arms ||4 which are securedfto the backrail 22 by suitable bolts engaging openings ||5 (Fig. 4) in said backrail. The clock is provided with the usual control stem extending through fone of the openings 42 in the cover plate 4| and carrying an index knob H6, see Fig. 1. The clock 3 is of a well known type commonly usedffor oven control and need not be described in detail.' It is provided with the usual timing train adapted to rotate the knob'l |6 ina counterclockwisedirection and the usual alarm train operated by a separate spring and adaptedtoturn a stem ||1, see Fig. 3, extending downwardly from-the clock at the rear of the back plate 22. In the opera'- tion of the clock mechanism, the knob A1I|6-is manually turned in a clockwise*drectiona'pre# determined distance andisthenaset tofalgraduation, see Fig.1',r indicating a Idefinitefperiod-of time.vr :The-1initialrlmovementwof the i knob k'winds the springs f or the timing train'xand: alarm -ftrain andpfsets `the :parts-.invr'readiness foruopeiat'ion. Thereafter, the operation of. thetimingtrain-re; turns the .knobl ||6to itsfinitial .position duringa openings 4-2 in the cover plate 4|.

period of time corresponding to the graduation at which the knob hasbeen set. At the-end of that time the alarm trainis tripped and the stem ||1 is moved rapidly in a clockwise direction (Fig. l0). The'stem ||1 hassecured thereto an arm ||8 pivotally connected to a link` H9, see Figs.

V2, 3 and 10,' secured by an extensible'connection '|20 to a `link |2| which is in turn pivotally connected `to the lower end of the lever 94, see Figs. 2 anda 3 only. By this means the operation of the alarm train ofi the clock trips' the latch lever 94in the same manner as the manual'operation offthe buttonl |04, thatfis, moves lever 94 clockwise onpivot 95. v

The valve 69 is connectedv by/a tube"|22 with a' thermostat bulb |23 (Fig. 2) within the oven 23 and to the vpilot of the ovenburner by a gas pipe |24, see also Fig. 3. Said valve vis'provided witha control knob |25, see Fig.f1,' mounted on a yportion thereof projecting through one of the The valvevvv 69 is of a well known form adapted tol respond to the temperature of the oven as indicated by the thermostat-.bulb |23fand to control the flow of gas to the' ovenfburner to prevent arise in temperature abover afpredetermineddegree as indicatedby the settingy of the control knob |25. The

valve 169 is supported fromthe valve 10 by the pipe connection 1|,' shown clearly in Fig. 3, and is not connected in any other manner to the backrail 22 or vtothe cover plate 4|. The valve 69 Athus receivesits primary support from the bracket .15' andy may be assembled with-thevalve 10, the cam 82,'the trip mechanism of the cam bracket 15as ay unitary assembly.

and the In the vconstruction of the stove, the manifold 46-41-48-and1 the valves 58 and` 60 vtogether with the `iittings 63 and 64 and a fittingIZG, see upper right cornerFig. 3, `to which the pipe 12 is secured, Vmay be' assembled 'as' a unitary structure or sub-assembly. Thefvalvje"10,pipe 1|, valve 69 and mechanism associated with the cam 82 may be attached to the' bracket 15 as a second unitary sub-assembly.' 'I'he nal assembly of thestove then'consistsonly of the attachment of the clock H3 and the two sub-assemblies just described to thebackrail 22, the addition of the several detachable pipe connections. the attachment of the bars 98 and |0| and the attachment of the several control knobs at the front ol'` the covery plate 4|. In this assembly operation the angular position of the manifold 46 may be adjusted as required and described and by the screw 54 to insure properpositioningof the stems supporting theseveralcontrol knobs-and ofthet'- ting |26. Y

The vdivision of labor in the construction of the sub-assemblies and the iinal assembly pro'- motes efficient operation inthe nal 4ass'en'ibly ly tothe speed.ofope'rrrtionfo'fiethe inalfass'embly. .The- .simplicity--v ofVv construction* ofIV lt-lie control mechanism forthe shutoff valve 1'0 iin which? valve andV vents are operated?by'themovement of`Vr a single' "control m'ember' L(cams 823W islalso an important factorA he ed asvasd'eiined by.thelappendedfclaims'. fl

The invention claimed is:

1. In a gas cook stove having a cooking top, burners, and a backrail projecting upwardly adjacent the rear edge of the cooking top. the combination of a gas manifold having a horizontal run extending along the rear face of said backrail and a substantially vertical run extending downwardly from said horizontal run, burner valves carried by the horizontal run of said manifold, control members for said burner valves accessible from the front of said backrail and vconnected to said valves through said backrail, means for securing said horizontal run to said backrail, said means permitting limited pivotal movement about an axis parallel to said horizontal run, means for securing said vertical run to a rear portion of the stove, said means being horizontally adjustable to adjust the angular position of said manifold, valves and valve control members with respect to said backrail, and pipe connections between said valves and said burners.

2. In a gas cook stove having a cooking top, burners, and a backrail projecting upwardly adjacent the rear edge of the cooking top, the combination of a gas manifold having a horizontal run adjacent the upper portion of the rear face of said backrail and a substantially vertical run extending downwardly from one end of said horizontal run, burner valves carried on the underside of said horizontal run, control members for said burner valves accessible from the front of said backrail and connected to said valves through said backrail, means for securing said horizontal run to said 'backraiL said means permitting limited pivotal movement about an axis parallel to said horizontal run, means for securing said vertical run to a rear portion of the stove, said means being horizontally adjustable ,'burners, and a backrail projecting upwardly adjacent the rear edge of the cooking top, the combination of a gas manifold having a horizontal run adjacent the upper portion of the rear face i of said backrail-and a substantially vertical run horizontal run, burner 4valves carried on the underside of said horizontal run, said backrail having an opening through which said valves are accessible from the front, a detachable cover plate covering said opening, control members for said burner valves accessible from the front of said coverplate and connected to said valves through openings in said cover plate, said control members covering said openings, means for securing said horizontal run to said backrail, said means permitting limited pivotal movement about an' axis parallel to said horizontal run, means for securing said vertical run to a rear portion of the stove, said means being horizontally adjustable to adjust the angular position of said manifold, valves and valve control members with respect to said backrail, and the position of said control members with respect to the openings in said cover plate, and' pipe connections between said valves and said burners.

4. In a gas cook stove, the sub-combination including an oven, a shuto valve having a valve stem biased to shutoff position, a cam having a face engageable with said valve stem to move the same to open position and having a latching face, a cam stem on which said cam is mounted, biasing means urging said cam toward valve closing position, a latch member engaging said latching face and normally holding said cam in position to open said valve, vents for incoming and outgoing air for said oven, closures Afor said vents, linkages connecting said cam and said closures to hold the same in open position, means on the forward end of said cam stem accessible from the front of the stove for rotating the same to open said valve and vents, and means for tripping said latch member to close the same.

5. In a gas cook stove, the sub-combination including an oven, a shutoi valve having a Yvalve stem biased to shutoff position, a cam having a face engageable with said valve stem to' move the same to open position and having a. latching face, a cam stem on which said cam is mounted, biasing means urging said cam toward valve closing position, a latch member ensginss'aid latching face and normally holding said cam in position to open said valve, vents for incoming and outgoing air iler said oven.' closures for said vents, linkages-connecting' said ,'cam and said closures to holdthe same 'in open position, means I on the forward end vof lsaid cani-steml accessible from the front'of the stove for rotating the same to open said valve andvents, a, clock mechanism mounted on the rear of said stove and having a control member accessible from the front thereof, and a connection between said clock mechanism and said latch 'member for tripping the same to close said valve-and vents.

6. In a gas cook stove.,the sub-combination of an oven, a shutoff valve having a' valve stem biased to shutoi position, a cam having a face engageable with said valve stem to move the same to open position and having a latching face, a cam stem on which said cam is mounted, biasing means urging said cam toward valve closing position, a latch member engaging said latching face and normally holding said cam in position to open said valve. vents for incoming and outgoing air for said ovenI closures for said vents, linkages connecting said cam and said closures tol hold the same in open position, a bracket, said valve, cam stem and latch member being supported on said bracket as a unitary assembly attachable as a unit to said stove with said cam stem accessible from the front of said stove, means on the forward end of said cam stem for rotating the same to open said valve and vents, and means for tripping said latch `member to close the same.

7. In a gas cook stove, the sub-combination including an oven, a shutoff valve having a valve stem biased to shutoff position, a cam having a face engageable with said valve stem to move the same to open position and having a latching face, a cam -stern on which said cam is mounted, biasing means urging said cam toward valve closing position, a latch member engaging said latching face and normally holding said cam in position to open said valve, vents for' incoming andoutgoing air for said oven, closures for said' vents, linkages connecting said cam and said closures to hold the same in open position, a thermostatic valve operated in response to oven temperature and having a temperature setting member, a bracket, said valves, cam stem and latch member being supported on said bracket as a unitary assembly attachable as a unit to said stove with the forward end of said `cam stem and the temperature setting member accessible from the front thereof, means on the forward end of said cam stem for rotating the same to open said valve and vents,

valves in series.

means for tripping said latch member to close the same, a gas connection between said valves, inlet and outlet gas connections, and ttings on said valves for detachably connecting said inlet connection to one of said valves and said outlet connection to the other to pass gas through said 8. In a gas cook stove having a cooking top, burners, and a backrail projecting upwardly adjacent the rear edge of the cooking top, the combination of a gas manifold having a horizontal run extending along the rear face of said backrail and a substantially vertical run extending downwardly from said horizontal run, `burner valves carried by the'horizontal run of said manifold, control members for said burner valves accessible from the front of said backrail and connected to said valves through loosely fitting openings in said backrail, studs secured to the horizontal run of said manifold and extending through loosely tting openings in said backrau, lock nuts carried by said studs and adapted to engage the front and rear surfaces of said backrail to secure said manifold thereto, means for securing said vertical run to a rear portion of the stove. said means being horizontally adjustable to adjust the angular position of said manifold, valves and valve control members withv respect to said backrail before said lock nuts are tightened, whereby said lock nuts when tightened maintain said manifold in adjusted position, and pipe connections between said valves and said burners.

\ 9. In a gas cook stove a front element having` apertures therein, the combination of a unitary sub-assembly including a base adapted for connection to the stove in iuxtaposition to the element and rearwardly thereof for concealment thereby, a shut-01T valve carried by the base', control mechanism for opening said valve and latching same in open position, a thermostatic valve carried by the base, a control member therefor, and means connecting in series the base carried valves for passing gas therethrough, said control member and control mechanism having portions registering with the apertures for accessibility of said portions from the front element and independent thereof when the base is connected to the stove.

10. A stove as dened by claim 9, characterized by the addition of a clock mechanism for closing the shut-off valve and mounted upon the rear of said front element and having a manual control element extending through an aperture thereof, and means detachably connecting said clock mechanism to theshut-off valvecontrol mechanism for clock mechanism operation of the shut-off valve.

ALVIN G. SHERMAN.

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