US2613623A - Insulated filing cabinet construction - Google Patents

Description

Oct. 14, 1952 H. c. BEHRENS 2,613,623

INSULATED FILING CABINET CONSTRUCTION Filed Sept. 4, 1948 4 Sheets-Sheet 1 3e {41 M 43 as INVENTOR. HerberZ' CBe/zrms Fig.1 BY

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H C BEHRENS INSULATED FILING CABINET CONSTRUCTION III '18! Oct. 14,1952

Flled Sept 4 1948 Oct. 14, 1952 H. c. BEHRENS 2,613,623

INSULATED FILING CABINET CONSTRUCTION Filed Sept. 4, 1948 ,4 Shuts-Sheet 4 G [5 ll- I N VEN TOR.

HerierzCBe/zrena F 5 7 M /Q 32 A TTO/P/VEYS Patented Oct. 14, 1952 INSULATED; FILING CABINET CONSTRUCTION Herbert (3. Behrens, Canton, 0hio, assignor to Diebold, Incorporated, Canton, 0hio,,a corporation of' Ohio Application September 4, 1948, Serial No. 47,838

(Cl. 109-59)n 3 Claims.

My invention relates to insulated filing cabinets of the type including a case having lwalls forming one ormore compartments, eachcompartment having an end opening, usually atthe front of the cabinet, and a drawer for each compartment of. the case, each drawer being operatively mounted for movement into-and out of its compartment and each drawer including a closure front, and the ends of the compartmentforming walls around the end openings constituting jamb frames each including straight top, bottom, andside jamb frame memberseach jamb frame member including at least one groove having a bottom wall and tongue; side walls, and each drawer front'being bounded by straight top, bottom, and side tongue walls arranged for fitting in the grooves of its associated jamb frame and grooves arranged for fitting over one set of thegroove tongue walls of the jamb frame, and-each of the compartment forming; walls of the case and the drawer front having a composite construction including sheet metal shell walls ,containing. a wall of heat insulating, material.

In usual prior insulated filing, cabinets,v it has been customary to form sloping sidewalls for the grooves of the jamb framemembers at the ends of thewallsforming end openings for. the compartments, and it has also been considered to be substantially a necessity that the groove side tongue Wall at theinside of each jamb framemembershould include heat insulating material, in order to attain adequate protection of the contents of the drawer in each compartment, when closed ancl locked, against'the actionof heat and moreparticularly the heat-incident to the subjection of'theinsulated filing cabinet to direct contact with flames.

Such a jamb frame for the end opening of the drawer compartmentof aninsulated -filingcabinet including sloping side walls for-the groove of the jamb frame and heat insulating material included in the groove side tongue wall at the inside of each jamb frame membergives rise to a complicated and difficult assembly ofthe walls of the jamb frame-with the other walls ofthe compartment usually precluding spot weld assembly, and also necessitates a substantial thickness of the heat insulating material of each compartment-wall having a jamb frame member at its end, thereby requiring a substantial weight of heat insulating material in the insulated filing cabinet.

The objects of the present invention include the provision of an improved insulated filing cabinet construction for the above described type of insulated filing cabinet and in which the jamb frame members for each compartment end opening include sheet metal walls adapted for-spotweld assembly with sheet metal walls forming'a lining for the compartment.

Further objects of the present invention include:

ing entirely of plies of spot weld connected sheetmetal, without any heat insulation material in the inside tongue wall, thereby minimizingthe weight of heat insulating material in the insulated filing cabinet.

Further objects of the present invention include the provision of an improved insulated filing cabinet construction including the above de scribed improved jamb frame for the end opening of each compartment, and which is adequate to provide desired protection of the contents of the closed and locked drawer in each compartment, against specified action of heat.

The foregoing and other objects are attained by the insulated filing cabinet construction, improvements, members, parts, combinations, and subcombinations, which comprise the present invention, the nature of which is set forth in the following general statement, and preferred embodiment of which together with their mode of use are set forth by way of example in the following description, and which are particularly and distinctly pointed out and-set forth inthe appended-claims forming part hereof.

The natureof the improved insulated filing cabinet construction of the present invention may be stated in general terms as including a case having walls forming one or more compartments, each compartment having an end opening, and a drawer for each compartment, each drawer being operatively mounted for movement into and out of its compartment and each drawer including a closure front,- the ends of the compartment forming walls around=the end opening constituting a jamb frame formed by members each-including walls forming a groove-and the side walls of the groove constituting outer and inner tongue walls, and the drawer front being bounded by a set of tongue walls arranged for fitting in the grooves of the jamb frame and grooves arranged for fitting over the inner set of groove side tongue walls of the jamb frame.-

Each of the compartment forming walls of the case and the drawer front have a composite construction including sheet metal shell wallscon-V taining a wall of heat insulating material. The

gasses jamb frame members around the end opening of each compartment includes sheet metal walls forming the jamb grooves, each with a transverse rectangular cross section, and each inner tongue wall forming the inner side of the groove in each jamb frame member has a reversely folded outer border including spaced plies forming a rearwardly opening deep groove. The compartment forming walls include sheet metal lining walls each having a front border band which fits in the deep groove between the spaced plies of the reversely folded outer border of one of the jamb frame members, and these spaced plies have spot weld connections with the front border bands of sheet metal compartment lining walls fitting therebetween.

By way of example, preferred embodiments of the insulated filing cabinet construction of the present improvements are illustrated in the accompanying drawings forming part hereof, in h Figure 1 is a view of afour drawer vertical insulated filing cabinet including the present improvements, the composite drawer compartment forming case being shown in vertical section, the top. drawer being shown in side elevation partially withdrawn from its compartment, the second drawer from the top being shown in vertical section and in its closed position in its compartment, and the two lower drawers being shown partly in side elevation and partly in vertical section in the closed positions in their compartments;

' Fig. 2 is a vertical sectional view of the composite compartment forming case of the improved insulated filing cabinet of Fig. 1, all of the drawers being removed from their compartments;

h Fig. 3 is an enlarged horizontal plan section as on line 3--3, Fig. 1, of the improved insulated filingcabinet, the top drawer being removed and the front end of one of the lower drawers being shown in top plan view, partially withdrawn from its compartment;

Fig. 4 is a fragmentary front elevation of the improved filing cabinet looking in the direction of the arrows 44, Fig. 1, and showing the top drawer, with portions broken away;

Fig. 5 is an enlarged fragmentary sectional view as on line 5-5, Fig. 4, showing details of the composite drawer lock for the improved insulated filing cabinet;

Fig. 6 is a fragmentary vertical sectional view as on line 66, Fig. 4, showing the relative arrangement in the improved filing cabinet of the jamb members of the composite case and the top drawer when in the closed and individually locked or collectively locked position, and before being subject to the action of heat or impact or both;

Fig. 7 is a view similar to Fig. 6 showing one characteristic distortion of the jamb members of the composite case and drawer front of Fig. 6 after being subject to the action of heat or impact or both;

Fig. 8 is a view similar to Fig. '7 showing another characteristic distortion of the jamb members of the composite case and drawer front after being subject to the action of heat or impact or both.

Similar numerals refer to similar parts throughout the drawings.

The illustrated embodiment of the insulated filing cabinet construction of the present improvements constitutes a four drawer filing cabinet' indicated generally by l0 and includes a 4 composite case indicated generally by H and having composite walls forming four end opening drawer compartments each indicated generally by l2 and located one above each other in the composite case I I. In each of the end opening drawer compartments l2 a file drawer indicated generally by |3 is mounted for horizontal movement, as by usual drawer suspension means I including a guide channel I4 at each side of each compartment I2, the drawer suspension means being of usual construction and not otherwise described in detail.

Each drawer I3 includes an upwardly opening drawer body indicated generally by l5 on the forward end of which is secured a composite drawer front indicated generally by I6. Each drawer body I5 is formed of sheet metal walls and constitutes an upwardly opening longitudinally extending rectangular box, in which are stored in a usual manner letters, documents, and similar material, usually contained in file folders or binders, and there may be provided in the drawer body l5 a usual compressor not shown.

Each composite drawer front 5 includes an outer sheet metal shell indicated generally by l1 in which is operatively mounted an individual drawer lock of usual construction including as shown upper and lower latches |8| and |8--2 normally spring urged to extended position as shown in Fig. 1, and having an operative bolt work connection, not shown with an individual drawer lock release lever |8-3 operatively mounted for pivoting about a horizontal axis at the center of the composite drawer front I6, the operating lever |83 being on the outside of the front wall of the shell drawer pull indicated generally by I9 is secured to the front wall of each drawer shell l1, and'each drawer pull I9 includes a transverse grippingbar |9-| behind which the release lever |83 is located. Each lower latch |82 of the individual drawer lock for each drawer I3 is arrangedin a usual manner for engagement and disengagement with a rectangular keeper opening 2|l2 formed in the bottom wall of the compartment l2 in which the drawer is mounted, and similarly each upper latch |8--| of each drawer I3 is arranged for engagement and disengagement in a usual manner with a rectangular keeper opening 20| formed in the top wall of the compartment |2 in which the drawer is mounted.

As shown, and preferably, the filing cabinet I0 is provided with a collective drawer lock which includes, as best shown in Fig. 5, a lock rod 2| slidably mounted below the bottom wall 5| of the drawer body I5 of the top drawer l3. The forward end of the lock rod 2| extends through suitable slide bearing openings formed'in the composite drawer front |6 of the top drawer |3 and into a lock head slide compartment 22 formed by sheet metal walls in the composite drawer front |6 of the top drawer l3. 0n the upper wall of the lock head slide compartment 22 there is mounted a lock catch 23. A transversely oval shaped lock head 24 is slidably mounted in the slide compartment 22 and the rear end of the lock head 24 is secured to the forward end of the lock bar 2|. The lock head 24 has operatively mounted therein in a usual manner a bolt 25 extendible and retractable in a usual manner by a key into and out of the detent notch 26 of the lock catch 23.

The lock rod 2| extends longitudinally beneath the bottom wall |5| of the body |5 of the top drawer I3 towards the drawer body rear end wallv As shown a I--2. Intermediate the top drawerfront I 5 and its rear end wall I5-2, there is secured on the bottom wall I5I a slide and stop angle clip 21 having an apertured leg 21-I through which the lock rod 2| extends. Betweenthe clip leg 21-l and the top drawer front It there is secured on the lock rod H a washer 28, and a compression spring 29 engirdles the lock rod 2| and is interposed between the washer 28 and the angle clip leg 21-I. On the rear end of the lock rod 2I there is secured a cam nose 30 located below the top drawer rear wall l52, and the cam nose 30 hasan upper surface 30-I sloping downwardly and rearwardly, the outer end of the cam nose 30 extending rearwardly beyond the top drawer rear end wall I5-2.

The composite case lI includes a rectangular rear wall indicated generally by I I-I, and in which is mounted a vertically extending lock bar guide tube 3I. The front wall of the guide tube 31 and front portions of the composite case rear wall II-I have rectangular openings 32 formed therein adjacent the bottom walls of the compartments 12, the opening 32 for the top compartment I2 being opposite the look rod cam nose 30, and the other openings 32 being vertically aligned therewith. Within the rectangular guide tube 3| there is mounted for vertical sliding a channel lock bar 33, and there are secured on the channel lock bar 33 four latch I keeper angle clips each indicated generally by 34, and each including'a keeper leg 34-4 extending through one of the openings 32 and havin formed therein a keeper slot 34-2.

The keeper leg 34-I for the top drawer is aligned with the cam nose 30, whose sloping upper surface 3III extends under the forward edge of the top drawer keeper leg 34-I and elevates the same and the channel lock bar 33 and all the other keeper clips to the collective locking position shown in Fig. 5, when the lock bar 21 is in the locked position shown in Fig. 5 with the lock head 24 locked within its slide compartment 22 and the cam nose 33 at its position closest to the case rear wall III.

On the outer face of the rear end wall I5-2 of the body I5 of each drawer l3, there is operatively mounted spring pressed latch means indicated generally by 35, and including a lower latch head 35l having a lower sloping bottom face 35-2 which catches in the keeper slot 34-2 of its associated keeper clip 34 on the channel lock bar 33, when the channel lock bar is in the locked position as shown in Fig. 5 and when the drawer is closed.

When the lock of the lock head 24 is unlocked, and the bolt 25 withdrawn from the detent notch 26, the compression spring 29 pushes the lock rod 2| and cam nose 30 and lock head 24 for wardly, withdrawing the cam nose 3!] from beneath the top drawer keeper leg 34-I, and permitting the channel lock bar 33 to drop to its lowermost position at which each of the keeper legs 34I is below and disengaged from its associated latch head 35I, as shown in Fig. 1.

The composite case I I includes the rectangular composite rear wall indicated generally by I ll, parallel and laterally spaced rectangular composite side walls indicated generally respectively by I I2 and I I-3, parallel and vertically spaced rectangular composite top and bottom walls indicated generally respectively by I 1-4 and I l5, and three vertically spaced composite partition walls each indicated generally by II--5. As shown, the composite case II is supported on 6 four casters each indicated generally by 33 secured to and depending from the casebottom wall I|-5.

The several rectangular walls of the composite case II are joined with each other atcomers and intersections, and form the four drawer compartments I2, all having the same dimensions, as shown, for mounting the drawers I3, all having the same dimensions as shown.

Each of the composite walls of the composite case II includes outer sheet metal shell walls within which is contained a thicker wall of insulation material, some of the composite walls being provided with metal wire mesh reinforcement.

Each of the case composite side walls lI--2 and II-3 and the case composite top wall ll-4 includes an outer single ply rectangular. sheet metal shell wall 31 and an inner single ply rectangular sheet metal shell wall 38. The sheet metal shell walls 31 and 38 are spaced fmmand parallel to each other, and a wall 39 of heat insulating material, such as asbestos cement is located between the walls 31 and 38,, the outer surface of the insulating wall 39 being in abutment with inner faces of the sheet metal shell walls 31 and 38. As shown and preferably, the insulating wall 39 embeds a metal wire mesh reinforcement 40 which is spaced from and supported by Z clips each indicated by 4| mounted on the inner faces of the sheet metal shell walls 31 and 33, and the clips on the outer sheet metal shell walls 31 are spaced from the clips on the inner shell wall 38-so that there. isno direct metal path having any substantial cross sectional-area between the outer sheet metal shell wall 31 and the inner sheet metal shell wall 38.

The composite bottom wall II-5 includes an upper two ply sheet metal shell wall 42 and a lower two ply sheet metal shell Wall 43 which are spaced from each other and between which is located a wall 39 of insulating material embedding metal wire mesh reinforcement 40 supported on and spaced by 2 clips 4,I depending from the top wall 42.

The case composite rear wall Ii-I includes an outer two ply sheet metal shell wall 44 and a set of inner sheet metal shell walls 45 eachspaced from the wall 44 and between which is located a wall 39 of insulatin material embedding metal wire mesh reinforcement 40 supported on and spaced by 2 clips 4I secured on the inner faces of the walls 44 and 45. Each of the inner sheet metal shell walls 45 of the composite rear wall I ll is rectangular and'constitutes the rear end metal lining wall of one of the compartments, I2.

Each of the composite partition walls II5 includes an upper two ply sheet metal shell wall 43 and a lower single ply sheet metal shell wall 41 which are vertically spaced from each other and between which is located a sheet metal filler box indicated generally by 48 and including a rectangular wall 48-! parallel with the parallel walls 46 and 41. The space between the upper sheet metal shell wall 46 and the sheet metal filler box 48 in each composite partition wall II-B contains a wall 49 of insulation material having an enlarged front end43l.

The ends of the compartment forming walls around the end opening of each compartment constitute an improved jamb frame .including straight top, bottom, and side jamb frame members each including walls forming a rectangular groove 50, the straight sides of each groove 50 being formed by an outer tongue wall indicated generally by H or 52 and an inner tongue wall indicated generally by 53. For the top compartment I2 there is a jamb frame member having a groove 50 in the front end ofv the composite top-wall I'I-4, and in the front end of the composite side wall II-2, and in the front end of the-composite side wall II-3, and in the front end of the upper composite partition wall II-6. A set of outer tongue walls include a tongue wall in the top composite wall I I-4, and in each of the side walls I I-2 and II-3, and a tongue wall 52in the top composite partition wall lI-Ii. A set of inner tongue walls 53 include a tongue wall 53 in the top composite wall II-4 in each of the side composite walls II-2 and II-3. and in the top partition wall II-Ii.

The groove side. tongue wall 52 in the front end of the. top partition wall II-B is common to thebottomgroove 5B of the top compartment I2 and to the top groove 50 for the compartment I2..which is the second from the top. Similarly, in the middle partition wall II-6 there is a common groove side tongue wall 52 at its front end which is a side wall for the bottom groove 50 for-the compartment I2 second from the top, and for the top groove 50 of the next lower compartment I2, that is the second from the bottom. The bottom partition wall II-6 has a similar common groove side tongue wall for the bottom groove 50' of the compartment I2 second from the bottom and for the top groove 50 of the bottom compartment I2.

The case bottom wall II-5 has a'front end including a bottom jamb frame member having a groove 50 with an outer groove side tongue wall 5 I and an inner groove side wall 53.

All of the compartments include jamb frame side members having grooves 50 formed in the front'ends of the case side walls II-2 and II-3.

All of the jamb frame members formed in the front ends of the case top wall II-4, the case side walls II-2 and II-3, and the case bottom wall II-5 have the same composite construction. Describing in detail for example the composite jamb frame member formed in the front end of the case side wall I I-3 and shown in the lower right hand corner of Fig. 3, this side composite jamb frame member includes a sheet metal outer shell formed as a continuation of the outer sheet metal shell wall 31 'of the case side wall I I-3 and including a front border portion 31-I of the side wall 31, a flat parall'el edged front band portion 31-2 bent inwardly towards the case side wall -I.I-2 at right angles to the front border portion 31-I, a flat parallel edged groove side wall portion 31-3 bent rearwardly towards the case back wall II-I at right angles to the front band portion 31-2, a parallel edged groove bottom wall portion 31-4 bent inwardly at right angles to the groove side wall portion 31-3, and a forwardly extending groove side wall portion 31-5 bent forwardly at right angles to the groove bottom wall portion 31-4, and a rearwardly extending parallel edged terminal border portion 31-5 reversely folded from the front edge of the groove side wall 1 portion 31-5 and laterally spaced therefrom, the groove side wall portion 31-5 and the reversely folded terminal border portion 31-6 thus constituting spaced plies forming a rearwardly opening groove having a substantial depth. 1

The front border portion 38-I of the sheet metal shell wall of the composite case side wall II-3 extends into the groove between the inner groove side .wall 31-5 and the reversely folded terminal border portion 31-6, :and 'the three plies of sheet metal 31-5, 38-I and 31-6 abut each other and have spot weld connections with each other, and form the multi-ply sheet metal tongue wall 53 for the lamb frame member formed in the front end of the composite case side wall II-3.

The insulating wall 39 of the composite case side wall I I-3 includes a front end portion 39-I extending into and filling the rearwardly opening channel formed between the sheet metal shell wall border portion 31-I, front band portion 31-2, and groove side wall portion 31-3, thus forming a composite outer groove'side tongue wall 5| for the groove 50 0f the jamb frame side member in the front end of the case side wall In the front end of each of the partition walls II-B a composite double grooved jamb frame member is formed having a construction similar to the single grooved jamb frame member formed in the front ends of each of the case top, side, and bottom walls. As previously described, in the front end of each of the partition walls II-G the jamb frame member includes parallel grooves 50 with a composite central common groove side tongue wall 52 and a multi-ply sheet metal tongue Wall 53 for each groove.

As shown for example in the jamb frame member formed in the front end of the case side wall I I-3, in Fig. 3, the width of the groove 50 is substantially one-half the thickness of the insulatingwall 39, the depthof the multi-ply sheet metal tongue wall 53 is. substantially equal to the 'width of the groove 50, and the depth of the groove tongue wall 5| is substantially twice the width of the groove 50.

In each composite drawer front I6 the outer sheet metal shell I1 is filled with a wall of in-' sulating material 54, embedding metal wire mesh reinforcement 55, and each drawer front outer sheet metal shell I1 includes in addition to the front wall I1-I, aback wall I1- -2, and at the top, bottom, and each side of the shell I1, sheet metal walls form a straight jamb member having a rectangular cross section. and including an outer composite tongue 56 at the outside of an tangular plug portion IG-I extends rearwardly from the plane of the rear faces of the composite tongues 56a distance which is substantially twice the depth of the tongues 56 from the front face of the drawer front, the plug portion IG-I being slightly smaller than the rectangular opening bounded by the jamb frame terminal border portions 31-6 into which the plug portion I1-2 extends when the drawer is closed.

By the foregoing described improved construction of the composite compartment forming walls of the improved case II, with their composite jamb members at their front ends, the advantages and economies of spot welding are attained in the spot weld connectionsof the three plies of the jamb groove sheet metal groove, side tongue walls 53, and a minimum thickness of insulating wall is attained in each of the composite compartment forming walls, since no insulating material is included in the inner groove tongue walls 53.

Contrary to what might be expected of the improved insulated filing cabinet Ill, when the drawers it are closed in their compartments [2 and are locked by at least the individual drawer locks, and when the improved insulated filing cabinet is is subject to the action of heat or impact or both, the distortions of the walls of the jamb frame members of the case I] and of the tongue and groove forming walls of the drawer fronts it, during the usual test period for an insulated filing cabinet, are such as to block the passage of flame or hot gases into the compartment E2 of the cabinet containing the drawer bodies 55 and their contents.

Fig. 6 showsthe relative arrangements of the jamb frame member of the top wall ll-4 of the insulated filing cabinet if) when the top drawer is closed and locked and the cabinet It is not being subject to the action of heat or impact or both. Fig. 7 is a view similar to Fig. 6 showing one type of characteristic distortions of the walls of the jamb frame member of the case top wall I 2-4 and of the interfitting tongue of the top drawer l3, and Fig. 8 is a view similar to Fig. 7 showing another type of characteristic distortions of these parts after the improved filing cabinet it has been subject to the action of heat or impact or both, for a specified period of time and at a specified temperature. In each of Figs. 7 and 8 it may be seen that despite the distortions of the jamb frame members and the interfitting parts of the drawer front [6, there are no direct passages for hot gases or flames between the jamb frame and the door. In particular it should be noted that there is no substantial distortion of the inner groove side multiply tongue wall 53.

The embodiments of the present invention illustrated and described herein are by way of example, and the scope of the present invention is not limited to the same or to the particular details thereof, but is commensurate with any and all novel subject matter contained herein which may at any time properly under'the patent laws be set forth in the claims hereof or originating herein, and the elements 'of any of such claims are intended to include their functional or structural equivalents.

I claim:

1. In insulated filing cabinet construction, a case including composite walls forming a compartment having an end opening, a drawer operatively mounted for movement into and out of the compartment and the drawer including a closure front, the ends of the compartment forming composite walls around the opening including jamb frame members forming a jamb frame extending around the opening, each jamb frame member including sheet metal walls forming a groove having a bottom wall and an outer groove side tongue wall extending from one edge of the bottom wall and a multi-ply inner groove side tongue wall extending from the other edge of the groove bottom wall the multi-ply tongue wall including a plurality of plies of sheet metal abutting each other and having connections with each other, and the drawer front having bounding jamb members, each drawer front jamb member including an outer tongue at the outside of an inner groove, each drawer front jamb member tongue being arranged when the drawer is closed to fit in one of the compartment jamb frame member grooves, and each drawer front 10 groove being arranged when the drawer is closed to fit over one of the multi-ply sheet metal jamb frame inner groove side tongue walls.

2. In insulated filing cabinet construction, a case including composite walls forming a compartment having an end opening, a drawer op-.

eratively mounted for movement into and out of the compartment and the drawer including a closure front, the ends of the compartment forming composite walls around the end opening including jamb frame members forming a jamb frame extending around the opening, each jamb frame member including sheet metal shell walls forming a groove having a bottom wall portion and an outer groove side tongue walk portion extending from one edge of the bottom wall portion and an inner groove side tongue wall portion extending from the other edge of the groove bottom wall portion and the inner groove side wall portion having a rearwardly extending terminal border portion reversely folded from its outer edge and the reversely folded terminal border portion being laterally spaced from the inner groove side wall portion, and each compartment forming composite wall including an inner sheet metal compartment lining wall having a front border portion extending between its jamb frame member inner groove side wall portion and the reversely folded terminal border portion, and the groove inner side wall portion and the reversely folded terminal border portion and the front border portion of the lining wall therebetween abutting each other and having connections with each other, and the drawer front having bounding jamb members, each drawer front jamb member including an outer tongue at the outside of an inner groove, each drawer front jamb member tongue being arranged to fit when the drawer is closed in one of the compartment jamb frame member grooves and each drawer front groove being arranged when the drawer is closed to fit over the jamb frame member inner groove side wall portion and the reversely folded terminal border portion and the front border portion therebetween.

3. In insulated filing cabinet construction, a case including composite walls forming a compartment having an end opening, the ends of the compartment forming composite walls around the opening including jamb frame members forming a jamb frame extending around the opening, and each jamb frame member including sheet metal walls forming a groove having a bottom wall and an outer groove side tongue wall extending from one edge of the bottom wall and a multi-ply inner groove side tongue wall extending from the other edge of the groove bottom wall the multi-ply tongue wall including a plurality of plies of sheet metal abutting.

each other and having connections with each other.

HERBERT C. BEHRENS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,485,360 Bartels et a1. Mar. 4, 1924 1,623,155 Bellamore Apr. 5, 1927 1,678,471 Hunter July 24, 1928 2,270,551 Peiter Jan. 20, 1942 2,354,358 Bates July 25, 1944

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