US1706264A - Stove and the like - Google Patents

Description

V March 19 1929. 5, THOMAS 1,706,264

STOVE AND THE LIKE Filed Oct. 5. 1927 8 Sheets-Sheet 1 March 1929. s. s. moms 1,706,264

STOVE AND THE LIKE Filed 031;. 5, 1927 Sheets-Sheet 2 March 19, 1929.

.1 Ii 1 1 6 106 116' I s. s. THOMAS 1,706,264

srovs AND THE LIKE Filed Oct. 5, 1927 8 Sheets-Sheet- 5 March 1929- s. s. THOMAS 06,264

STOVE AND THE LIKE I Filed Oct. 5, 1927 8 Sheets-Sheet 4 ,I I 25 20 I 20 23 I "ya-M M I J I F H I I I I I I Wenfir March 19, 1929. TH MAS 1 ,70 ,264

STOVE AND THE LIKE Filed 0012.5, 1927 8 Sheats- Sheet 5 119 4g 26 37 as, n 35 74 1 "as i 5' M i 147 \i 'l I 1 March- 19, s. s. THOMAS 6, 6

STOVE AND THE LIKE Filed Oct-5. 1927 8 $heets$heet 6 N A w i s. s. THOMAS 1,706,264

STOVE AND THE LIKE March 19, 1929.

File Oct. 1927 8 sheets-sheet 7 March 19, 1929. s TH A 1,706,264

' s rovp AND THE LIKE Filed 0011.5, 1927 a Sheets-Sheet a.

fzoenlor Patented Mar. 19, 1929.

warren STATE-S STEPHEN S. vTHOMAS, OF LEBANON, OHIO.

s'rovn AND THE LIKE.

Application filed October 3, 1927. Serial No. 223,674.

This invention has to do with improvements in stoves and the like. More particularly the invention hasto do with improvements in ovens for cooking and similar op erations.

Generally speaking, the oven construction herein disclosed is so arranged that, it can'be closed and sealed in a substantially steam tight manner curing the cookin operations. Furthermore, ovens embodying the features of the present invention may be heated 'in such a uniform manner that greatly improved cooking conditions are established within the oven chamber. These improved conditions are such that it is possible to simultaneously carry on various kinds of cooking operations in the same oven, and cooking operations involving various kinds and flavors of foods, substantially without any cross transfer of flavors and the like from one article to an other.

The ovens herein disclosed are also heat insulated so that the necessary cooking operations may be carried forward with a minimum consumption of fuel or heating energy and with a minimum amount of heat radiation to surrounding objects.

Cne of the features of the invention relates to an improved construction of oven involving the use of a pan-shaped oven shell which can he s ped into place and properly suptrted at the correct spacing from the sur ounding ieat insulating walls so as to esahli i certain o the passages for the heating or heating element. This shell is. con- 'llCtOtl as a self-contained unit which may slipped into place and then fastened in permanent manner, these operations being he last operations in the assembly of .z-ii Conversely this shell may be readily removed from the remaining structure without the necessity of complet ly disassembling the oven. This will m ake itpc-ssible to either replace or repair the oven shell from time to time without having to undertake very extensive operations on the remaining structure.

A further feature of the invention relates to the provision of an improved door construction sealing the openings, particularinto the oven chamber. This I i I .ed with-a heat insulating space which is ordinarily filled with suitable materialrand within the door structure there is provided a supporting and reinforcing frame to which the shell sections themselves are attached and by which they are reinforced. This frame is itself of suliicient mechanical rigidity andstrength to withstand the severe stress to which the door is subjected in ordinary service, so that the relatively thin sheet metal shells are properly reinforced and stillened.

The door frame already referred to also serves as a convenient and desirable arrangement to which the hinges and latches necessary maybe connected so as to distribute the stresses'thereof and avoid danger of screws pulling through the relatively thin sheets of the shell itself.

A further feature of the door construction is to provide an arrangement such that when the dooris forced shut it makes effective contact with the projecting edgeportion of the inner shell of the oven proper. In this way a satisfactory and tight joint is established directly between the door and the edge of the oven'shell. This will insure a maximum of seal effect in the simplest manner.

A further feature of the invention relates to the provision of an improved construction O lf-blblYr-Ollt door for relieving internal pressure in case of necessity, arising, for example, from an explosion of gases in the combustion chamber and passages surrounding the oven itself. This blow-out door is provided with an improved form of latch which will effectivcly retain the door in closed position under all normal conditions, but will allow said door to almost instantly blow open to establish a full opening in caseof necessity.

A further feature of the invention relates to the provision of an improved form of eduction flue for withdrawing the burned and spent gases from around the upper portion of the oven shell and for delivering them to the ventflue or connection. This passageis so constructed that it is a self-contained unit, and also it'is so arranged that itwillnaturally tend to urge the heating gases to distribute themselves uniformly and evenly around all portions of the ovenshell so as to heat the same in a uniform manner. The use of this line will accomplish the foregoing result without the necessity of otheran'd complicated arrangements of passages.

A further feature of the invention relates to the provision of an improved damper arm gement for controlling the delivery end of the flue aforesaidnnd also for controlling the connection thereof with the delivery flue.

This damper arrangement includes a novel box structure or chamber within which the damper is pivotally mounted, said chamber itself being made up largely of sheet metal elements pressed into simple form which can be readily slid together. These parts when so assembled serve also to establish the pivotal mounting for the damper itself.

A further featureof the invention relates to the provision of an improved form of interlocking between said damper and the gas valve which controls the supply ofgas to the burner. This interlock arrangement is such that the gas valve cannot be turned on without first opening the damper; and conversely, the damper cannot be closed with out first shutting oil the gas valve.

Another feature of the invention relates to the provision of an improved construction for supporting theloiver portion of the oven shell when in place; and also relates to an improved construction of false bottom beneath the oven shell for preventing the creation ofexcessively hot spots on the floor of the oven shell. Y

- Another feature of the invention relates to the provision of an improved form of latch for locking the door in closed and sealed position.

Other objects and uses of the invention will appear from a detailed description of the same which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings: a

Fig. 1 shows a front elevation of an improved stove embodying the features of the present invention;

Fig. 2 shows a back ing to Fig. 1; Fig. 3 shows a vertical section taken on elevation correspondthe lines 3-3 of Figs. 1, 2 and 1 looking in the directions of the arrows;

Fig. 1- shows a vertical section on the line {1-1- of Fig. 3 looking in thedi'rection of the arrows;

yFig. Sshows a horizontal section on the a. lines 5-5 of Flgs. 5 and 1 looklng in the direction of the-arrows;

Fig. 6 shows a perspective View of the gas distribution flue which is located immediately above the oven shell, the flue bemg shown up-side-down; Flg. 7 shows a horizontal section taken on the lines 7-7 of Figs. 8 and 1. looking in the direction of the arrows;

Fig. 8 shows a'detail section on the line 8-8 of Fig. 1 looking in the direction of the arrows but onenlarged scale;

Fig. '9 shows a detail section on the line 9-9 of Fig. 1 looking inv the direction of the arrows but on enlarged scale; I

Fi 10 shows a front face view of the door frame removed from the door;

understood manner.

Fig. 11 shows a vertical cross section on the line 11-11 of Fig. 10 looking in the direction of the arrows;

' Fig. 12 shows a fragmentary horizontal section on the line 12-12 of Fig. 1 looking in the direction of the arrows but on enlarged scale, being practically full sized;

Fig. 13 shows a vertical cross section through the upper damper box unit removed from the rest of the oven structure, with the damperclosed, being a view substantially on the line 13-13 of Fig. 2 looking in the direction of the arrows but on enlarged scale;

Fig. let shows a plan view corresponding to Fig.1?) looking down in the direction of the arrows 14-14 of Fig; 13;

Fig. 15 shows a front face view correspond ing to 1 being a view substantially on the line 15-15 of Fig. 13 looking in the direction of the arrows; and

Fig. 16 is a fragmentary side elevation on the line 16-16 of Fig. 2 looking inthe direction of the arrows.

In certain of the figures, notably Figs. 1, 2, 3 and 4t, 1 have shown the features of the present invention as being incorporated in an oven structure which is a portion of a. stove which stoveis also equipped with a series of open burnerslocated above the oven itself. These are the burners 20 illustrated in said figures. Said burners are controlled by the usual gas cocks 21 supplied from the gas main 22. This upper structure is also provided with the customary shelving 23 for support of dishes and utensils in the well All .of these features are shown in the present application merely by way of illustration and these structures may or may not be used in COIljllllCblOll with oven embodying the features of the present invention. 7

The oven structure proper which constitutes the subject matter of the presen invention ispreferably heat insulated in its side Walls 24- and 25, as well as in its back wall 26, roof 27, and bottom 28. These parts, with the exception of the bottom 28, are therefore made false or of double thickness so that the intervening space may be filled with suitable material such as mineral wool, asbestos or other suitable material.

The structure is conveniently built up from an inner shell comprising the side 'plates29 and 30 together with the top plate 31, and a back plate 32. The rear edges of the side plates 29 and 30 are flanged inwardly as shown particularly in Figs. 5 and 7 and are seated within forwardly projecting flanges on the sides of the back sheet 32. These corners are then connected together in anv convenient manner as by means of bolts. The parts 29, 30 and 32 may be made as a single sheet. I

The top sheet 31 has its side edges flanged downwardly and embracing the upper edges iii) around into a rather shallow and broad structure, its edges being folded together as shown at 97 in Fig. 6. The vertical thickness of this fine is such that it occupies the space between the top 65 of the oven shell and the sheet 31 already referred to. This is clearly shown in Figs. 3 and 1. The length of this flue is such that it reaches from the forward portion of the top of the oven shell through a. port in the rearportion of the structure and projects slightly beyond said rear portion as clearly shown. in F 5. Furthermore, the top of the flue '96 is provided with a forwardly projecting lip 98 (Fig. 6 showing the fine upside down), said lip 98 being riveted or screwed to the sheet 91 already referred to.

The sides of the flue 96 are provided with a series of ports 99 and 100 which are graduated .ing somewhat smaller in the rear 12 of the flue structure, than in its front These ports therefore allow for an of the burner gases into the flue throughout its length, but owing to the graduated sizes of these ports there is a tendency to compel more of the spent gases to enter the front portion of the flue than would otherwise be the case. In this connection it must be ke t in mind that he general direction of travel is upwardly and backwardly 1n diagonal direction towards the and by making the ports at the rear portion of the flue 96 somewhatsma ler than those in its front portion there is created acrowding of gases passing through said rear ports such as to compel a greater percentage of said gases to pass into the front ports.

There is provided adamper for the rear end of the flue 96, which damper I will now explain in detail.

Said damper is shown in detail in Fi 1-1 and 15 and is also well illustrated 2, 3 and 5.

upper portion of the back of the structure;

1' 7 in Figs. It includes a housing 101 which housin is formed from a plate 102 bent to establish a front face 103 (see Fig. 15), a top face 10% (see Fig. let) and a bottom face 105 (see Fig. 13). There is also a curved sheet 106 the upper and lower edges 10. and 108 of which are crimped to receive the edges of the top and bottom sheets 10% and 105 already referred to. This sheet 106 issuitably shaped so that it can he slid into place with respect to the sheet 102 and when this is done the box like housing is established. The sheet- 106 is also provided with a pair of cars 109 and 110 which are adapted to make flat contact with the back sheet 3'? already referred to as b shown in These ears may e tien s .iewed in place to such back sheet and will hold the housing securely in place thereon.

The front face 103 established, as already explained, is suitably formed to provide an inwardly projecting socket 111 which receives the outer end of the flue 96 as is best evilenced from 5. Suitable asbestos or the like may be placed within the socket 111 at the time the housing 101 is set up against the end of the flue so as to establish a gas tight connection.

A box 112 is stamped out from the top 102 of the housing 101, said box being perforated to establish a large delivery port as is evident from Fig. 1 1. A flue 115 may be set down over this box so as to receive the spent es delivered from the flue 96.

There a damper located in the housing 101. The same includes a plate 116 the front face of which is lined with an asbestos or other plug 117 (see Figs. 13 and 15 in particular) and said asbestos block is held onto the plate 116 by a series of cars 118.

The lower edge of the plate 116 is secured to a horizontal rock shaft 119; and said rock shaft passes through notches 120 formed in the edges of the plate 106 below the position of the ears 109 and 110. There are other ears 121 formed in the frontwall 103 of the plate 102; said cars 121 projecting rearwardly to a suitable position to act as stops for the rock shaft- 119 and thus hold the same properly positioned in the notches 120 without *reating unnecessary friction. Thus when the housing is assembled with the rock shaft and damper in place there are simultaneously established suitable bearings for the rock shaft.

The rock shaft is so journaled that when the damper is turned into the vertical position it comes againstthe projecting portion 111 of the front face 103, and thus effectively closes the rear end of the flue 96.

The two damper rock shafts 93 and 119 are so connected together that they may be simultaneously operated. For this purpose these shafts are provided with the crank arms 122 and 123 respectively, aid crank arms being joined together by a vertical link 121. A bell crank 125 is pivoted to a bracket 126 secured to the back sheet 37, the pivotal point 127 thereof being in line with the two shafts 93 and 119. One arm of the bell crank 125 is connected to the link 124': by a pivotal con nection 128; and this arm of the bell crank as well as the crank arms 122 and 123 are parallel to each other so that as the bell crank is rocked both of the shafts 93 and 119 are simultanenously rocked.

There is an operating rod 129 which reaches along the side of the oven from a point adjacent to the gas cock 87 to the rear of the oven. The rear end of said rod 129 is bent over as shown at 130 in Figs. 2- and T. and this portion 130 is then connected directly to the vertical arm of the bell crank 125. A spring 131 tends to move the bell crank to the damper closing position.

The front end of the rod 129 with a knob 132 of substantial size, which knob is in close proximity to the handle of the gas cock 87. lVhen the spring 131 draws the dampers and connected parts the closed i s provided is preferably base ring 42 by the hinges gas is turned off the dampers may be closed;

and conversely, if the button 132 should be forced back to close the dampers the cock will be simultanenously closed.

The door 49 which controls the opening into the burner space beneath the oven proper hinged at its lower edge to the 133 and 184. A suitable handle 135 is provided on this door.

There is a bracket 136 secured to the front sheet 50 at a position above the central por-' tion of the burner opening. This bracket 136 has a pair of forwardly pro ecting ears 137 and 138 which are of spring material, and

the front ends of said ears are rounded as shown in detail at Fig. 9. Another bracket 139 is fastened to the door 49 and has an upwardly projecting finger 140 which is of diamond shape as best shown in Fig. 9. The arrangement is such that when the door 49 is closed said finger will force its way between the lugs 137 and 138; whereas when the door is pulled open said fingers will again force themselves between said lugs. Normallywhen the door stands in the closed position the effect of the legs is sufiieient to retain the door closed against all ordinary forces tending to open it; but in case of oreation of an excessive internal pressure within the oven the door will blow open without damage to any parts.

Around the door opening for the main door 48 there is placed a jamb plate which is of beveled shape and is designated by 141 in Fig. 12. This plate has at its front edge a flange 142 which rests against the back face of the front plate 50, and extends backwardly along the flanged'edges 33 of the shell plates.

The rear edge of the jamb plate 141 is flanged inwardly as shown at 143 on a curve which corresponds to the flanged edge 68 of the oven shell proper. g the part against which the flared edge of the oven shell proper seats when the oven shell is set into place.

The front edge of the flanged portion 83 is bent outwardly at right angles as shown at 144 and rests directly against the flanged portion 142 of the door jamb. This portion 144 is provided with upset portions 145 at the position of the screws 146, said portions 145 having sufficient resiliency to insure said locking of the parts together under the influence of said screws and without the use of lock nuts.

- Preferably there are brackets or Z bars 147 placed intermediate between the shell of This flanged edge 143 is the oven proper and the side plates 29 and 80, at positions close to the front edge of the shell of the even so as to space the same irrespective of the flanges 143. These Z bars or brackets also serve as convenient parts to whichthe oven shell may be connected by means of screws as shown in Fig. 10.

The construction of the main door 48 is best shown in detail in Figs. 10, 11 and 12. It includes pan 148 the edge portions 149 of which are flanged on a bevel correspond ing generally to the door jamb 141. This pan 148 is also provided with a rounded groove portion 150which takes against the front portion edge of the oven shell when the door is closed.

The door also includes a front plate 151 which overlies the extreme front. edge portion of the pan 148, which extremefront edge portion is flattened out as shown at 152 in Fig. 12. The edge of the plate 151 is then folded backwardly over the portion 152 as shown at Fig. 12 so to lock the sheet 121 to the pan without the use of screws rivets or other parts.

Vithin the peripheral portion of the pan there is located a reinforcing f 'ame the details of which are shown in Figs. 10 and 11. This frame includes a pair of companion U shaped sections of angle material 153 and 154. The flat surfaces of these sections are joined together by bars 155 and 156 so that a rectangular frame is established. The flanges 157 of this frame are formed on an angle conforming to the beveled portion 149 of the pan, so that the frame will be set back into the pan before the frontsheet 151 is set onto the pan. The parts are so proportioned that when the sheet 151 is set into place the frame will occupy a position immediately behind said pan as shown in Fig. 12.

There is a supplemental cover sheet 158 which sets over the central portion of the front sheet151; and the sheet 151 is preferably recessed slightly as shown in 12 to accommodate the sheet 159. Screws 159 may be passed through the different sheets and into the frame so as to lock them directly to the rame itself. v V

The bars 155 and 156 which join the flat sections together are preferably welded to said sections.

One side of the door is hinged by a pair of hinges 160 and 161. T he screws for these hinges pass into the door fr that s .1: so that the weight and forces imposed by the door are communicated "to these hinges through the instrumentality of said frame.

At the other side of the structure there are provided a pair of locks 162 and 162% for loci:- ing the door in closed position. Each of these includes a plate 164 which is secured to the door frame by screws; and a handle member has a tongue 166 which reaches sidevrise when the handle turned iiit. zontal oosition to engage a bra hot 167 secured to the oven c side of each of the locks and each of these brackets has a slant beneath which the tongue 1G5 ma as to securely nib the door in c if de red a vertical cross pics-e l6 own and described in the features of I. n J. 0 not intend i0 ein s g in the fro edges or" op -y, togeth r wit he inner edge of into the opening and shell curved on cylindrical surI con ave surface facing towards the of the structure, a removable prising sides, top, bottom and size to be set b: clzwardlv t opening and pastthe flange A shell eing of smaller size than the heat atcd ch nibor afores: id, to thereav esish vertical passages n r an 1 back of the oven she l an outw around the front open of st the flange aforesaid,

i 1 sun. 1

said oven shell rearwardlv and adapted to seat i A .crti opening lla'vlL adapted to wedge into t intd contact with the o. the oven shell, a supported by the rails aforesaid below the position of t e: r beneath said alse bottom on the opening-rs in the structi 1' reaching into the opening and establishing an oven shell abutment, said flange being curved on a cylindrical surface having its concave surface facing towards the interio of the structure, a removable oven shell 0 proper size to be set backwardly throu h th oven opening and past the flange aforesaid, said oven shell being of smaller size than the heat insulated chamber aforesaid, to thereby establish vertical passages bee-ween the sides and back of the oven shell and the heat insu lated chamber, an outwardly ex ending lip around the front open edge of s: oven shell concave r arwardly and adapted to seat against the flange aforesaid, means for securing the oven shell in said po ion, pairs of bracket clips secured to the inside oi the heat insulated structure below the position of the oven shell and including inwardly reach ing ho izontal arms, rails supported by said clips imn'iediately below the position of the oven shell and supporting said shell and a door for the oven opening having its e( portion beveled and adapted to wedge into the oven opening and into contact with the flange on the edge of the oven shell, substantially as described.

3. In a device of the class described the combination of a heat insulated chamber of heat insulating construction, there being a rec'angular oven opening in the front wall said chamber, the edges oi said opening together with a surrounding the inner edge 01" said ing and reaching into the opening and interior or" the structure, a removable oven shell of proper size to be set ba lzwardly hrough the oven opening and past the flange a'ioresaid, said oven shell being of smaller size then the heat insulated chamber ai'oresaid, to tierobv establish vertical passages between L} l A inc 4. In a device of the class described the 1 combination of a heat insulated chamber of of the structure, a removable oven shell of no aer size to be set backwardl 7 throu h the l l to oven opening and past the flange aforesaid,

an outwardly extending lip around the front open edge of said oven shell concave rearwardly and adapted to seat against the flange aforesaid, means for securing the oven shell in said position and a door for the oven opening having its edge portion beveled and adapted to wedge into the oven opening and i into contact with the flange on the edge of the oven shell, substantially as ClQSClllJGC.

5. In a deviceof the class described'the reaching into the opening and establishing an, oven shell abutment, said flange being curved'on a cylindrical surface having its concave surface facing towards the lIl'lOI'T of the structure, a removable oven shell of roner size to be set backwardl throue'h the oven opening and past the flange aforesaid,

an outwardly extending lip around the front open edge of said oven shell concave rearwardly and adapted to seat against the flange aforesaid, means for securing the oven shell in said position and a door for the oven opening having its edge portion adapted'to wedge into the oven opening and into contact with the flange on the edge oft-he oven shell, substantially as described.

6. In a device of the'class described the combination of a heat insulated chamber of heat insulating construction, there being a rectangular oven opening in thefront wall of said chamber, pairs of bracket clips secured to the inside of the heat insulated structure below the position oftho oven openin and including inwardly reaching horizontal arms, rails supported by said clips immediately below e position of the oven opening, a flange surrounding the inner eo e of said oven opensize than the heat insulated chamber afore said to thereby establish vertical passages between the sides and back of the oven shell and the heatinsulated chamber, an outwardly em rectangular oven vopening in the front wall of said chamber, a removable oven shell of proper size to be set baclzwardly through theoven opening, said oven shell being of smaller size than the heat insulated chamber aforesaid to thereby establish vertical passages between the sides and back of the oven shell and the heat insulated chamber, means for securing the oven shell in said position, a suitable burner beneath the oven shell, there being an air inlet opening in the lower portion of the heat insulated chamber for the admission of air to said burner, a flue located in the space between the top of the oven. shell and the top of the heat insulated chamber, said flue being relatively thin and broad and extending from front to back of said space, and occupyin the full height of said space, a waste gas delivery connection in conjunction with the rear end of said flue, a damper therefor, there being a series of openings in the sides of the flue, said openings being of graduated size from front to back and larger in the front portion of the flue than in the back portion thereof, substantially as described.

8. In device of the class described the combination of a heat insulated chamber of heat insulating construction there being a r ctangular oven opening in the front wall said chamber, an oven shell of proper size loc ted within the chamber and having its front open side registering with the oven said oven shell being of smaller size heat insulated chamber to thereby ertical passages between tire sides a suitable burner beneath the oven shell, there being an air inlet opening into the lower por tion of the ieat insulated chamber for the admission of air to said burner, a fine located in the space between the top of the oven shell and the top of theheat insulated chamber, said flue beingrelatively thin and broad and extending from f: to bacl: of said spaces, and occupying the full height of said spaces, a was. 3 gas (h livery connection in conjunction vith the rear end of said flue, a damper therefor,and there being a series of openings in the sides of the f ue, said openings being graduated size from front to heel; and larger in the frontportion of the due than in the back portion thereof, substantially as described.

9. In adcvice ofthe class described the combination of a heat insulated chamber of heat insulating construction there being a tangular oven opening in he front wall chamber, an oven shei. of proper size within the chamber and having its front open side registering with the oven opening, said oven shell being of smaller size than the heat insulated chamber to thereby establish vertical passages between the sides and back of the oven shell and the chamber, a suitable burner beneath the oven shell, there being an air inlet opening into the lower portion of the heat insulated chamber for the admission of air to said burner, a fine located in the space between the top of the oven shell and the top of the heat insulated chamber, said flue being relatively thin and broad and extending from front to back of said spaces, and occupying the full height of said spaces, a waste gas delivery connection in conjunction with the rear end of said flue, a damper therefor, and there being a series of openings in the sides of the flue, substantially as described.

10. In a device of the class described the combination of a heat insulated chamber of heat insulating construction, having an'oven opening in one of its walls, the edge portion of said opening being beveled from its outer to its inner portion, together with a closure for said opening, said closure comprising a sheet metal pan having its peripheral portion beveled to correspond with the bevel of the door opening, the outer edge of said pan being flanged outwardly, a rectangular frame of angle bar construction sea-ted into the pan adjacent to its flanged edge portion and of proper size to engage the pan around said portion, a cover sheet for the pan seated against said frame, the marginal portion of said cover sheet being folded over the flange of the pan and thereby attached thereto, a reinforcing plate on the front face of the cover sheet and overlying the frame aforesaid, means for connecting the reinforcing plate to the frame through the cover sheet, and a filling of heat insulating material within the pan and beneath the cover sheet, substantially as described.

11. As a new article of manufacture a door closure for the opening of a heat insulated structure said closure comprising a sheet metal pan having its peripheral portion beveled to correspond with the bevel of the door opening, the outer edge of said pan being flanged outwardly, a rectangular relatively rigid frame seated into the pan adjacent to its flanged edge portion and of proper size to engage the pan around said portion, a cover sheet for the pan seated against said frame, the marginal portion of said cover sheet being folded over the flange of the attached thereto, a reinforcing plate on the front face of the cover sheet and overlying the frame aforesaid, means for connecting the reinforcing plate to the frame through the cover sheet, and a filling of heat insulating material within the pan and beneath the cover sheet substantially as described.

12. As a new article of manufacture a door closure for the opening of a heat insulated structure, said closure comprising a sheet metal pan having its peripheral portion beveled to correspond with the bevel of the door opening, the outer edge of said pan being flanged outwardly, a rectangular relatively rigid frame seated into the pan adjacent to its flanged edge portion and of proper size to engage the pan around said portion, a cover sheet for the pan seated against said frame, the marginal portion of said cover sheet being folded over the edge of the flange of the pan and thereby attached thereto, and a filling of heat insulating material within the pan and beneath the cover sheet, substantially as described.

STEPHEN S. THOMAS.

pan and thereby

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