US2605759A - Closure for ovens - Google Patents

Description

Aug. 5, 1952 T. E. EHAREs cLosURE FOR ovENs Filed Jan. 13, 1949 fit.

Patented Aug. 5, 1952 CLOSURE FOR OVENS Thomas vEsta Phares, Shelbyville, Ind., assignor to Chambersl Corporation, a corporation of Indiana Application January 13, 1949, Serial N o. 70,717

Claims.

This invention relates to a closure for ovens, and has particular reference to a means for adjusting the door frame to provide a sealing t between the door frame and the door.

In order to provide a proper baking atmosphere, ovens must be capable of retaining heat for a long period of time. Heat loss from the oven due to seepage requires the constant application of heat to the oven, thus making the operation of the oven a very costly affair. Additionally, the constant variations of heat within the oven which are an incident to such uneconomical operations make for undesirable baking conditions. For these reasons it is essential to have a tight t between the oven doo-r and the front of the oven.

In the better grades of stoves it has been customary to form the door and the door frame of castings, and to machine the meeting surfaces to provide as close a t as possible. However, the door frame is frequently twisted to a slight extent when the screws by which it is secured to the chassis of the stove are tightened, with the result that the machined surfaces do not lie in the same plane and therefore can not form asealing In accordance with the present invention, means are provided to adjust the door frame when it is secured to the chassis so that the machined surface, which engages a machined surface of the door when the door is closed, will lie in a single plane. The adjustment of the door frame is made after the frame is secured to the front of the oven, and any additional adjustment necessary to provide a sealing t with the edges of the door can be made after the door is mounted. Accordingly, nothing can interfere with the proper alignment of the door frame. l

The adjustment means of the present invention is simple and inexpensive and is concealed by the outer shell of the oven so that it does not detract from the appearance of the oven.

The structure by which the above advantages are attained will be described in the following specification, taken in conjunction with the accompanying drawing, in which:

Figure 1 is a fragmentary front View of a cooking stove provided with an oven embodying the invention;

Fig. 2 is an enlarged perspective. View of the front of the oven with the oven door open;

Fig. 3 is a cross sectional view, taken along the line 3--3 of Fig. 2, but showing the door in closed position; and

Fig. 4 is an enlarged cross sectional view show- 2 ing the top portion of the r top portion of the door closed and in sealingI relationship with the frame.

In the drawings, the reference numeral 2 indicates a cooking stove having-a front 3 and a door 4 closing the front of an oven contained in the stove. The door is hinged at its bottom to a hinge lug 5 and latched atfits top edge by means of a handle 6 engaging a latch 1.

p The door comprises spaced panels 8 and 9 and a casting I0. The casting is of the same shape as the door and ts around the outer edges with one portion II projecting between panels 8 and 9. The projecting face of portion II is machined, as indicated at I2, to form a smooth at'surface adapted to engage the door frame to form a sealing t. i

The outer surface of panel 8 is preferably coated with porcelain or other suitable material to provide a neat appearance for the exposed surface. The inner panel may -be finished in any suitable manner, and is secured in place by means of a plurality of screws I3; The'space between panels 8 and 9 islfilled with :insulation I4, preferably rock wool, but which may be of any other suitable material, 'Y'

The door frame I5 is a casting which extends around the front-edgesfof the oven and has a portion I 8 machined to cooperate with machined surface I2 of the door to form a sealing fit therewith. A plurality of screws I1 secures the door frame to the body front sheet I6 of the stove. 'I'ightening screws I1 frequently cause a slight twisting of casting I5, thereby spoiling the proper alignment of the door frame. In accordance with the teachings of the present invention, screws I'I are screwed only part Way into position, and set screws I9 are then adjusted to position the door frame in proper alignment.

The set screws are threaded through threaded apertures in casting I5 and the forward end of each screw engages body front sheet I6 of the stove which is vrig-idly supported from behind by the stove frame, as shown in Figs. 3 and 4. Continued rotation of any set screw, after its forward end is in engagement with the body front sheet, will force the portion of the casting in the area of the particular screw away from the body front sheet. Each screw I9 is tightened until the door frame is properly aligned. Then screws Il are tightened to hold the door frame in position. Although only two set screws are shown, it will be obvious that any desired number may be used'. If it is found that the door frame is not properly aligned, screws I1 may be loosened until the door frame with theY proper adjustment is made, and then tightened again.

An outer shell 20 extends far enough below screws I1 and I9 to conceal them from view when the stove is completely assembled. The outer shell is cutaway around the front of the oven to permit the hinged door to move about its hinge.

The oven doorisprovidedat, each endV with a door stop Zlf. Thedoor stop is in the form of a at metal strip shaped in an irregular curve and has one end rigidly secured to door 4, and the other end projecting through a slot 22 in door frame I5. A stop rod 23 is secured to the end of door stop 2| inside the body lof the stove, and has a coiled compression spring 24 encircling it between a pair of washers 25 and'23. Top Washer 25 is secured to the stove in any suitable manner, and a nut 21 is threaded on 'the bottom of rod 23 under washer 26 to provide means for adjusting the spring so that door A11 may function properly; When door 4 is opened, the bottom end of rod 23 compressess'pring 124 against top Awasher-25,

thereby cushioning the op'eningmovement of the door. When the door is closed, the .expansive force 'of spring'24 urges the door `towards closed positionv to "facilitate closing Smovement.

Although I have describ'e'd Ja'pref erred embo diment ofzmy invention in considerable detailfit will .be understood vthat'the ldescription `thereof is intended 'Sto belillustrative, .rather than .restrictive, as .1n-any Ldetails may be modified or `changed without departing 'from the spirit or scope'o'f my. invention. :Accordinglyl: do not desire to .be restricted .to .the .exact construction described. I claim:

1. In an oven having a front opening, a vbody i front sheet having a relatively fixed surface surroundingisaid front opening, a door framesecured Aaround the front `ofthe oven in front of saidfbodyrfront sheet by-means of 1a fplurality of screwsgand .a plurality of set screws threaded throughsaid door'frameand engageable with said relativelyxed surface therebehind to move said door Lframe ,away `fromfsaid xed surface.

2. In an;.oven vhaving a front-openingfa body Y iront sheet having a relativelyxed suracesurrounding said `front opening, a door iframe securedaroundfthefront of the voven in front of said body front sheet'by means of a pluralityfof screws, aiplurality'of'set screws threaded throughv saiddoor fr.ameand-engageable Ywith said relatively vfixed-surface therebehind-to move said-door rarneaway from-saidfxed surface,- and adoor engaging saiddoor frame., the meeting surfaces of saidldoor and door frame being lmachined to provide a close ii't.

3. In an oven having a front provided with an opening therein, a door frame secured to the front of said oven around said opening, and a plurality of screws threaded into said door frame to engage said oven front and said doorY frame, said screws being operable to adjust the relative spacing between said oven front and localized areas of said door frame.

'4. In a cooking stove,`an oven having a Afront provided with an opening, a door frame secured around said opening, a door hinged to one edge of said door frame, said door having a machined surface shaped to conform to said opening whereby the machined surface of said door may be podoor frame, a plurality of set screws threaded through said door frame and operable to adjust the spacing of said door -frame relative to the front of said oven to align said door frame with the machined surface oi said door, and an outer shell secured to the front of said oven and having portions ycut out to permit hinged movement of said door, said cuter sheli concealing vsaid set screws,

5. In an oven, a door iramecomprising a casting securedto said oven, a body'front sheet providing a xed surfaceon said oven behind said door frame, a door hinged to engage said door frame, said'door comprising a casting having an `edge the same size as said door frame and en- REFERENCES einen The following referencesiarer of recordin the le of this patent:

' UNTLTED sTAfrasPATEN'rs Number Name Date 679,839' Carter et al. Augn, 1901 1,618,346 Lartz Feb. 22, 1927 1,851,962 Moi Mar. 29, 1932 1,914,372 I-Ivoslef June 29, 1933 2,072,820 Kessler Mar. 2, Y1937 2,091,442 Holman Aug.v 3l, 1937 2,140,408 Sherman Dec. 13, '1938 2,335,329 Whitehead Nov. 30, 1943 i FOREIGN PATENTS Number Country Date 485,777 Great-Britain May 25, 1938 616,514 Great Britain Jan. 2l, 1949

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