US1560526A - Metal door - Google Patents

Description

Nova

Az s. BARRows METAL DOOR ,a m l a t I m 5 .w s e a 2 mi o mg o t 8 O W .OU O .M M o o `mm O 0 n w o d O O n .l

G .m pm o o O. a D O m 2 w. o l0 O G .m o o Fa o o o o O" O O n G O On 0 Z O zf l l l 1 1\ 1 l l r IIIUF I l l l I l l l l l I l l l l l I l l l x l l l l l l l l l l l l o o o o o o F Nw o o Nov 10, A. S. BARROWS METAL DOOR Original. Filed May 8, 1919 Sheets-Sheet 2 Patented Nev. 10,1925;

UNITED? STATES L y 1,560,526 PATENT l.ol-Fica A ALLAN s. nAnnows, oF oHIoAGo,`ILL1No1s.

METAL DOOR.

Application mea may s, 1919seriaiNe. 295,603. Renewed July 22, 1921. serial No. 486,808.

T0 @Hecho/m. fait concerto.'

- Be it known that I, ALLAN S. BARnows, a citizen of the United States, residing. at Chicago, in the county of Cook and State of Illinois, have invented a'certain new and useful Improvement in Metal lDoors, of

which the following isa full, clear,` concise, and exact description, reference' being had to the accompanying drawings, forming a part of this specification.-

This invention relates to improvements in metal doors. I 'In railway practice, considerable diiiculty has heretofore be n encountered in connection with 'the malntena-nce of side doors of box cars. Originally,all such doors'were made of wood but'the same have proven unsatisfactory for the conditions encountered because of the excessive weight of vsuch wood doors and their nflammability, and

furthermore because of the "distortion, sagging, splintering and mutilation thereof resulting from the manner-in which they are opened and closed by the use of crow-bars and other heavy tools commonly employed.

. Many attemptsl have, of course, been made to overcome the diticulties'above noted, both x by inventors andrailroad oiicials and to substitute therefor an all-metal: door or a combination wood andv metal door.. These attempts, however, have been more or less unsatisfactory due to the fact that they have necessitated excessive weight which not'only Acauses a Iheavy initial cost but forms an unnecessary dead weight or unproductive load of the car as a whole. a

The object of my invention is to provide an all-metal door `especially adapted for side doors of box cars although its application is not necessarily 'limited thereto, and in `which .I emp oy va minimum amount of material consistent" A with" the necessary strength and concentrate' they material at such a metalvv door as is composed mainly'of sheet metal of relatively extreme thinness reinforced at those points particularly sub-l those parts where the greatest strains are'.

imposed. The invention`al'so contemplates ject to indentation, bending. or distortion.

Another and more specific object of the invention is to provide a metal door of the character indicated, particularly designed for use on railway cars where the doors are supported at the bottom by rollers and in which specific embodiment of my invention, the reinforcing members appliedv to the main sheet metal part of the doors either provide an `excellent supporting track for the door on which said rollers bear or may be adapted to form the support for the roller journals, the rollers in the latter case extending below the edge of the door and ridingvupon a track. supported directly by the car body.

Another'object of my linvention is to pro- A vide ametal door, particularly adapted for railway box cardoors and which -is in the nature of an improvement of the invention disclosed in my allowed pending application #185,411, filed August 10, 1917 for improvement in sheet metal car doors, one feature o'f the improvement being, broadly, to facilitate and cheapen the fabrication of the door, as compared with the structure disclosed in said l(zo-pending application. Broadly stated' Vthe cost of fabrication is materiallyy lesssubstantially on the line .3 3 of Fig. 1.

Figs. 1l and 5 are views corresponding to Fig. 3 but illustrating two'vother embodiments of the invention. Figs.f6, 7, 8 and 9- are horizontal sectional views corresponding to Fig. l3 but illustrating only one edge ofthe respective doors, the remaining parts being broken away in order to permit the location of the' views on the sheet, said Figs. 6 to 9, inclusive, illustrating still other embodiments of the invention. Figs. 10 to 14l inclusive, are vertical sectional views, partly broken away in each instance, corresponding to Fig.,2 of the drawing and illustrating still other embodiments of the invention, as hereinafter explained. i

Referring .rst to the construction illus?` trated in Figs. 1, 2 and 3, the door, isillustrated asl of the usual rectangularform and comprises three panels A, B and C, upper ,reinforcing Z-bar D, lower. reinforcing possible Z-bar E, edge reinforcing Z-barsF and G l land horizontal lreinforcing angle irons H-H where the panels are united. g

-Each of the panels A, B and C is made of relatively thin sheet metal and in order to reduce this thickness to the greatest extent p consistent with the necessary' strength, the panels are provided-with suitable strengthening corrugations which in the instance shown, extend horizontally as indicated at -20. In addition, tlie panels A are provided with vertical corrugations adjacent their respective end edges, as indicated at 21-21, the edge corrugations 21 of all the panels being made in alinement as clearly indicated in the drawing. Said edge corrugations 21 may be merged into the uppermost and lowermost horizontal corrugations as indicated at`22-22 at the corners of the door. It will -be observed that.- all of the cor'rugations preferably extend outwardly, that is, from the inner pla-ne of the door, to thereby facilitate sliding the door back. and forth in proximity to the side Wall of thecar. The panels A, B and C are preferably overlapped along'their meetinghorizontal edges and .riveted as indicated at 23, these junction lines being reinforced by the angle irons H--H- As-is well known, the greatest outward thrust or pressure on doors vof box cars is at the bottom of the door, the outward thrust gradually lessening as the top of the door is reached and, in view of this condition and in order to still further lessen the weight of the -sheet metal, I may make the panels A, B and C of varying thicknesses, the upper'panel A being the thinnest, the intermediate panel B slightly heavier and the lower panel vC still heavier, the variations, however, preferably not being in excess of 1/64th for the different panels, and although this dierence appears slight, the resultant saving in weight and initial cost is very appreciable when the two doors of the car are considered.

As is well known, the vertical edges of the door are subjected to severe service, particularly as the operators use crow-bars or any othertool to force the doors from closed to open position and frequently in the opposite direction.V When the load is against the doors, it is, of course, difficult to shift them and the crow-bars are then brought into play. In order to minimize theeffects of this practice, the vertical edge Z-bars F and G are employed, the same being applied as most clearly shown in Figs. 1 and 3. In practice, th'e sheet metal panels A, B and C will be provided with a marginal yflat `portion as indicated'at 24 on the right hand edge and with a corresponding flat portion 25 on the left hand edge, the sheet lat the left Ahand edge, however, being extended and bent at right angles to the door as indicated at 25 to form a seal. The Z-bars F and G are applied with one flange 26 riveted or spot-welded to the-marginal portions 24-24 of the sheets, the other flanges of the Z-bars being extended over the vertical edge corrugations 21 and riveted or spot-welded thereto so as to form an extremely rigid. brace for the edges. The eect of rivetingl the flat edges 24 of the sheets and flanges V26 of the Z-bars produces a multiply-edge which in itself is adapted to effectively resist indentationland the bridging effect or trussing of the edge lcorrugations 21 bythe; Z-bars .riveted or spot-welded thereto effectively minimizes -tendency to crush or collapse the door. In this latter construction, it is also evident that the horizontal corru-l gations 20 merging at their endswith the' vertical corrugations 2l also bracethe latter and said horizontal corrugations may be so extended as to be riveted or spot-Welded to the adjacent flange of the Z-bar to still fur ther increase the resistance against crushing or collapse. v

At the'upper edge of the door, the Z-bar D is applied as clearly shown in Fig. 2, the upper panel A having a flat vmarginalv portion asindicated at 27, to which the rugati-on' and riveted or spot-welded there-1 to similar to the application. of the side. rZ-bars F and G.

At the bottom edge of the door, the lower panel C is preferably provided not only with a flat marginal vportion 29 in the Igeneral plane of the door, but with an'inturned. right angle flange 30, the latter forming a seal similar to the flange 25 onv the rear edge of the door. The Z-bar E is applied in the manner heretofore indicated for the Z-bars D, F and G and need not be specifically detailed. In connection with the lower Z-bar E, it will be noted that it provides a horizontal track asiindicated at 31, thus adapting it for cooperation with the roller 32 which is mounted on a fixed journal carried by a bracket 3 3, which in turn is-secured to the side sill or other suitable portion of the car body. Asv will be understood, there will be a series of such door supporting rollers 32 so as to at all times sustain the weight'. of theI door in any position thereof. With the construction described, it is evident that the lower reinforcing Z-bar performs a plurality of functions including thatof providing a track for the door. The construct-ion described is easy to fabricate and overcomes a difficulty heretofore experienced where sheet' metal doors have been attempted and. in-

ability to provide a satisfactory supporting section for the doors has been encountered.

In the construction illustrated in Fig. 4,

laddition of reinforcing brid ing stripsh34` 34. These strips 34 exten len hwise' of the edge corrugations A21 and a so of the uppermost and lowermost `horizontal corrugations of the panels. Said strips are united' to the flat marginal portions of the door by the same rivets 35 or other -means employed for uniting the Z-bars with' the flat marginal portions ofl the door. The strips 31 bridge the 4respective edge 00r- Vrugations and are united tothe mam' portions of the sheet metal within the edge corrugations by rivets 36 o r spot-weldingso as to, in effect, produce a Vtube along each edge of the door, the tubes thus formed providing great strength against indentation, crushing, distortion or warping. In

addition, it is evident. that the strips 34 which cover the vertical edge corrugations 21 will prevent any of the material or load in the car from lodging therein which minimizesv the possibility of the loadl interferring with the opening lof the door.

In the `construction shown in Fig. 5, thel door is made substantially' the same as that disclosed' in Figs. 1,2 and 3 except that vertical edge corrugation 21 are omitted, although the horizontal corrugations are retained. "I-bars E are employed Aalong the respective edges Vunited to--the flat marginal portions 124 4oit the sheet metal as by the rivets 37 or spot-welding, the otherv flanges of the 'Zfbars E beingv riveted or spot-welded inside of 'theflat marginal edges 124 as indicated at In the construction illustrated in Fig. 6, the main portion of the door formed by the sheet metal 'isth same as thatl illus# trated in Figs. 1, 2' and 3, but instead ofl .portions of thedoor-as indicated at 42.

In Fig. 8, the construction is similar toY that shown inQFig. 7 with the addition of a reinforcing bridging strip 434 that .is -secured to the flat marginal portions of the sheet metal portion of the door by the same rivets or other securing means 442 as is the T-bar 441. The strip 434 is secured to the sheet metal portions of the door within the edge corrugations by rivets or spot-welding as indicated at 436.

In Fig. 9, I employ a bridging strip 534 united within the edgev corrugation 521 as by rivets or spot-welding indicated at 536,

said strip 534 being extended 'beyond the sheet metal comprising the `panels of the door and having secured thereto van angle viron 43, The angle iron is applied with one flange thereof parallel to the strip 534 and the `otherl flange extending at right' angles thereto and awa plane of the door. `X In this construction, the

-main portion of the door will preferably be .provided with an outturned flange in-l dicated at 44 and :riveted or spot-.wel ed to/ the angley iron 43 as indicated at` 45.`

The construction .illustrated in Fig. 10 4corresponds, to that shown in Fig. 6 and is a vertical section thereof'showing the from the inner ,1o. sheet vmetal composing the panels of the position of-,the upper and lower angle `irons- The construction illustrated in 11 vis Athe same as that shown in Fig. 10 with the addition of a reinforcing orbridging strip 4634 thatl is united to the sheet metalforming the -panels or main portion of the door on each. side ofv the respective upper andl lower edge corrugations.

The construction shown in Fig-12 the I same as that shown'in Figs. 1, 2 and 3 with the addition of rein-forcing y or'. brid ing strips 734 united to the main portions o the door by rivets or otherwise on opposite sides of the respective upper and lower horizontal somewhat from that illustrated in Fig. 4l by having the upper panel of sheet metal vin-` wardly flanged as indicated at 46.

-In the construction illustrated in Fig. 13,

.the Z bar 'E2 is combinedwith a bridging stripv 834 in amanner. somewhat different from that shown in Figs. 1, 2 and 3. In this construction, the upper and lower porstions "of the sheet metal Iformin the'main portion of the door is formed with an outwardly inclined section 47 anda terminal flat edge 48 tojwhich the outer .flange of the Z-bar E2 is'riveted or spot-weldedas indicated at 49.' The bridging or reinforcl ing strip' 834 isunited to thesheet metal panels vvithlnthe inclined portions `47 as indicated at 50,-the said bridging strips 834 f being eitended and riveted or otherwise rigidly;united with the inner flanges of the Z-bars E2 as indicated at, 51. In this manner, `-it .will beevident that I form aptube sheet metal panel, the bridging strip and the Z-bar. It will also be noted that the constructions shown in both 'of Figs. 12

and 13 are especially adapted for cooperation with supporting rollers at thel bottoms of Athe doors, the track for said rollers Vbeing formed by the Z-bars as indicatedl in said drawings where portions of the rollers 'are` indicated more or less diagram.-l

matically at 32-32.- l v` The construction illustrated in Fig.` 14

embodies a bridging or reinforcing strip 934,

an angle liron 52 and portions of the sheet ius in effect along the edges of thedoor by employing three elements', a part of 'the metal pan-els.` The latter are formed with an' outwardly inclined section 53, a short vertical section 54 parallelV to the vmainplane of the door and an inturned marginal porv tion 55, the latter being riveted or otherwise secured-to one ange of the angle iron 52 as'indicated at 56. The bridging strip 934 is riveted ory otherwiseligidly secured to the .main portions of the panel sheets'as indicated at 57, said stripl 934 being riveted or otherwise rigidly secured as indlcated at 58 cial formation of the panel sheets. In this along its outermost'edge to the other flange of the angle iron 52. This construction also produces the effect of Ia tube along the edgev of the door by' combining the three elements, the angle iron, the bridging strip, and a speconstruction as in those shownin Figs; 1, 2, 3, 12 and 13, the reinforci-ng commercial `rolled beam provides an 'eiicient track for the door supporting rollers at the bottom thereof. l

Although yI have herein shown and described what I consider the preferred means for carrying out my invention, the same' `are merely illustrative and various changes may be madewithout departing from thespirit of the invention, as, for instance, the

ysheet metal portions of the door may be made in a single panel or in two panels and the reinforcement ofythe panels or sections of the door within the edges thereof may be done in other ways than those shown in the drawings, that is, by the use of horizontal corrugations. Ik g contemplate all changes and modifications. that come within the scope of the claims appended hereto.

It will be noted that common characteris- -tics of all of the forms illustrated'in the tss drawings are the flat multiply marginal edge portions of the doors and the formation vof the sheet metal comprising'the main part of the door in such wayas to extend a portion of the sheet metal outwa-rdly from the main plane of the door so as to effectively strengthen the door against lateral or-` bending forces. The fiat multiply marginal portions mentioned are sometimes of two thicknesses and sometimes of three thicknesses but i-n each instance, one of the thicknesses is formed by a sectionof the reinforcing commercially rolled beam, whether it be an angle T or Z, and furthermore, the said rolled shapes are so formed and applied that in every instance one section thereof is parallel to the said marginal portions o f the doors and another section at right angles thereto. By this arrangement, the edges of the doors are very strongly braced against indentation from forces applied in a direction parallel to the plane of the door and also against bending or prying outwardly.'

It is also evidentthat the reinforcing commercial shapes in conjunction with the other strengthening indentations of the sheet t Y y metal effectively strengthen the`door against sagging or distortion in the plane of the door. l

I claim:

1. A'door of the character described, com prising sheet metal and commercially rolled shapes, the sheet metal having portions thereof extendingoutwardly from the inner plane of the door along the edges of the door, said shapes being secured to the sheet metal along the edges and each of said shapes including a section at right angles to the plane of the door also extending outwardly from said inner plane and a section parallel thereto, said shapes being rigidly united to said outwardly extending portions of the sheet metal, the door having multipleply flat marginal portions, one ply of each of which is constituted bythe section of the corresponding shape which extends parallel to said plane of the door.

2. A horizontally slidable door of the character described, 'comprised mainlyy of thrusts, and a commercial shape secured along the bottom edge of the door and vrigidly united to the sheet metal main portion of the door, 'said shape having one section thereof extending horizontally and perpen dicular to the general plane of the door, the door being adapted for support at the bottom when moved horizontally.

3. A door of the character described, comprising a main `portion Aformed of sheet metal, reinforcing bridging strips, and a reinforcing commercial shape along the bottom edge of the door, the sheet metal comprising the main portion of the door being corrugated and formed along its edges with portions thereof extending outwardly from the inner plane of the door, said bridging strips being united to the sheet metal forming the main portion of the door within the area defined by said outwardly extending portions thereof, said shape having a section thereof extended parallel to the plane of the door and rigidly united to the adjacent bridging strip to .form a multiply lower edge, said shape having also a horizontal section eX- the sheet metal of the main portion of the door and an integral section extending out- ".wardly from the main plane of the door,

said outwardly extended section being disposed inwardly from the corresponding margin of the door.

14. In a door of the character described,`

having the main portion'thereof comprised of a. plurality of sheet metal panels arrangedy one above the other and united along their adjoining edges', eaohpanel having a pluralityof outwardly disposed corrugations therein extending parallel to the united edges ofthe panels; and rigidifying mem` sheet metal panels, each panel having corrufv gations formed therein and offset from the main plane of the sheets; means rigidlyuniting the panels along adjacent edges; a

stiffening flange along the'adjacent edges of'- the panels; andl a stiffening flange section extending perpendicular tothe plane of the sheets along the outer edges of the door, all

said stilfening flanges and corrugations extending from the main plane of the ,sheets to the same side. n

16. In combination with av railway car having a door opening,'rol1ers arranged under said door opening, and adoor comprising a sheet metal panel and a box-like rigidifying structure at its lower edge having a horizontal web bearing on said rollers, an upstanding flange to which the edge of the panel is Secured, and a depending flange standing back of said rollers, said panel being formed with corrugations, which are pressed inwardly from the marginal, portion of the panel. v

17. In combination v witha railway 'cart having a door opening, rollers der said door opening, sheet metal panel and a` rigidifying'- structure at its lower edgehaving-'a horizontal web bearing on said rollers,

n arranged una door comprising a tsaid depending flange and to one of said Y corrugations.

18. In combination withv a 'railwaylcar having -a door opening, door supporting means arranged under saidv doorl opening, and a sheet metal door provided at its lower l an upstanding flange to which the edge of the panel is se- 1,oso,52e Y edge with jahollow box-like4 structure, the bottom of which. bears on said door supportingmeans. f

19. In combination with a railway car having a door opening, rollers arranged `under said-door opening, and a door comprising a marginal frame, a sheet `metal panel within said frame, and means at the lower edge of theY door providing with said' V frame and panel a hollow box-like construcvtion,` the bottom of which bears on said rollers. l

20. In combination -with a railway car having a door opening, rollers arranged v .under said door opening, and a door the 30 g upper portion of which consists of a single thickness of sheet'metal'and the lower or- "tion of hollow box-like construction,l the ottom of which bears `on said rollers.

21'. A metal Yside door for a railway car` 35 adapted to slide on the outside of the car across the door openingcomprising a sheet metal panel formed with rigidifying corrugations; a stillening member angular in cross section secured to the lower edge of thev panel, and a flat plate secured to the projecting portionI 'of the still'ening member and extending upwardly to one of the corruga- `tions of the panel above the same so as to constitute a' hollow reinforcement for the 95 lower edge of the door. t

22. A metal side door for a railway car adapted to slide on the outside of lthe car across the door opening comprisinga sheet metal panel formed wlth horizontally dis- 190 posed rigidi'fying corrugations, a stil'en-` ing member angular 1n.cross section secured to the lower edge ofthe panel, and a flat plate secured to the stil'ening member a-nd to the corrugated portion of the panel above m5 the same providing .a box-like structure atA the lower portion of the-door.,

p 23. A metal side door for a railway car adapted to slide on the'outside of the car across the door opening comprising a sheet no.

metal panel formed with inwardly projectin'g corrgations, a stiiening'member at they f lower edge' of the' panel and projecting in` wardly therefrom, and a -flat plate on the vinside of the panel secured to the corrugated 1,15"

l.portion ofl the panel and'to said Astiening member. s 24. vA metal sidedoor for a railway car `adapted to -slide on the outside` of the car across the door opening comprising a sheet 1go metal panel formed with inwardly projecting, horizontal corrugations, fa Z-bar at the@ loweredge ofv the panel and projecting inz-wardly therefrom, and a fiat plate on thel inside of. thepanel secured to one of said*V corrugations and to said Z-bar. 'e c 25.u A metal lside door for'a railway car adapted to slide on the outside of the car across-the door openin comprising a sheet metal panel formed wit a plurality of hori- 13 zontally disposed, inwardly projecting coriugations which terminate withinthe edges gins and having webs inwardly projecting' therefrom, an angle bar secured to the upper edge of the panel having an inwardly projecting web, a Z-bar secured to the lower edge of the panel and projecting inwardly therefrom, and a flat plate on the inside of the panel at itslower edge secured to one of said corrugations and to said Z-bar.

26.. A railway car door comprising a marginal frame Consisting of 'members at the top, bottoni and forward and rear edges which are angular in crossr section with flanges lying inthe front plane 'of the door andflanges projecting inwardly therefrom, and a sheet metal panel having its marginal edges secured flatwise to said first named flanges and formed with. corrugations pressed inwardly from'said marginal edges.

27. A railway `car`doorconiprising a mar-y ginal frame consisting of members at the top, bottom and forward and rear `edges which are angular in cross section with flanges lying in the front plane ofthe door and flanges projecting inwardly therefrom, and a sheet metal panel laving its marginal edges secured 4flatwise, to said first named flanges pressed inwardly from said marginal edges to a depth corresponding substantially to the width of said marginal frame.

' ginal frame consistingof angle bars at'the top, forward and rear edges having'flanges in the front plane of the door and flanges projecting inwardly therefrom, and a Z- bar at the bottom, the intermediate web of which is horizontal and Vextends backwardly from the front plane of the door and a sheet metal panel having its marginal edges secured flatwise against the first named/flanges of the angle bars, and the upward-lyprojecting flange of said Z-bar and formed 4with corrugations pressed inwardly from said.

margin al edges.

29. A railway car-door comprising a marginal frame consisting of angle bars at thev top, forward and rear edges having flanges in the front plane of the door and flanges projecting inwardly therefrom, and a Z-bar at the bottom, the intermediate web'o'f which is horizontal and extends backwardly from the fiontplane of the door, a sheet metal panel having its marginal edges secured flatwise against the first named flanges of the angle bars and the upwardly lprojecting flange of said Z-bar and formedfwith corrugations pressed inwardly from said marginal edges, and a plate on the inside of said door secured to the depending flange ofthe Z-bar and to the sheet metal panel.

and formed with co'rrugations' vat vthe bottom, the intermediate web ofk which is Vhorizontal and extends .backwardly from the front plane of the door,l

a sheet metal panel having its marginal edge secured flatwise against the first named flanges of the angle -bars and the upwardly ,projecting flange of said Z-,bar and formed with horizontal corrugations plate on the inside of said door secured to ressed -inwardly from4 said marginal e ges, and a 1 the depending flange ofthe `.Zd-barl andk t0 one of said corrugations. v

31. In combination vwith the door frame of a railway car, a track arranged abovel the door opening, guide brackets below said door opening, and` a door comprising a marginal frame consisting [of members at the top and forward andrear edges which are angular in cross section with flanges lying in the front plane ofthe door and ,flanges projecting inwardly therefrom, and a Z-bar bottom member, the intermediate web ,ofv

which is horizontally arranged and extends backwardly' from the front plane of the door, '95 L v'flanges of said top, forward and rear mema sheet metal panel secured to the first named bers and to the upstanding flange of said kZ-bar and formed with inwardlyextending,

.horizontal corrugations, anda plate on the l y l inside of the door secured to the depending 28. Arailway car door comprising a mar.

flange of said Z-bar, and to oneof said co1?- the depending flange of the Z-bar standing back of said guide flanges. 32. A railway car doorcomprising in combination la marginal rectangular frame, a sheet metal panel,and a' plate cooperating with` said frame and panel to provide ahollow box-like structure `at the lower edge ofthedoor.l i m 33, A railway .can door comprising, in combinationN a sheet metal panel formed with horizontally disposed corrugations,

and al Z-bar at the lower edgeof the panel having an upstandingllange to which the panel is secured, and an oppositelydisposed depending flange, the intervening we said Z-bar being substantially horizontal.

34. A railway car door the upper portion of which consists of a single thickness of sheetv metal provided with angular members, for rigidifying its edges and formed 'l corrugations projecting with stiil'ening into the space defined by said angularmembersand the lower portion of which consists of a hollow box-like construction lying approximately between the planes on opposite sides of said corrugations.

35. A railway car door comprising, in combination a marginal rectangular frame bof Y consisting of members angular in cross section, anda sheet metal panel formed with corrugations terminating within the edges of the sheet 'and projecting into thespace l' Z-bar at the lower edge of the bottom panel having anV upstanding flange to which the panel-is secured, and an oppositely disposed depending. flange, the intervening web of .Y said lZ-bar being substantially horizontal.

37. A railway car 'door comprising, in

combination: amain portion comprised of a plurality of panels rigidly united, and Z- barsat thetop and bottom edges of the top and bottom panels, respectively, each Z- bar having a ila-nge extending inwardly toward the ce'nter ofthe door, and towhich the respective paneljedge is secured, and an oppositely disposed flange extended outwardly from the center of the door, the intervening web of each Z-bar being substantially horizontal.

In Witness that I claim the foregoing I have hereunto subscribed my name -this 1st day of May, 1919.

ALLAN s. BARROWS.

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