US1771304A - Kalamein door - Google Patents

Description

y 9 w. w. Ma GRuDER KALAME IN DOOR Filed Jan. 11. 1928 3 Sheets-Sheet 2 INVENTIOR July 22, 1930. I w 'w, MacGRUDER 1,771,304

KALAMEIN DOOR Filed Jan. 11, 1928 3 Sheets-Sheet 5 my invention;

Patented July 22, 1930 UNITED STATES Parr 'FFlCE I WILLIAM W. MACGRUDER, OF GREENSBURG, PENNSYLVANIA, ASSIGNOR TO W. F. 'OVERLY & SONS, OF GREENSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA Thisinvention is for an improvementin metal sheathed Wooden doors known in the trade as kalamein doors.

Kalamein doors are widely used where pro- 1,- tection against fire is desired, and in order to 1 meet the requirement imposed by insurance companies, theirconstruction must be such that the door willstand up after the wooden core has been burned out.

The present invention has for its object to provide a door construction wherein all of the wooden parts of the door are encased sheet metal andwherein the sheet metal casing is firmly held together.. A further objectrof the invention is to provide a door of this kind which is convenient and cheap to assemble and wherein the metal, sheathing I and the wood can be cut to size and kept in stock separately and assembled as required.

at 'The invention may be readily understood by reference to the accompanying drawings in which Figure l is a front elevation of a com-' plete "door constructed in I accordance with Figure 2' is a perspective view of the wooden parts of the door frame without the metal applied thereto j j i Figure 3 is a transverse sectionthrough the door" shown in Figure 1 Figure 4 is an exploded View of the several parts ofthe door in a position to be fitted. together; r

Figure 5 is a detail view showing'the mane "se ner-in which thepanel is secured to the side frame; i

Figure dis an enlarged section in the of line VIVI of Figure 1; i A Figure 7 is a similar view in the 10- line; V IIVII of Figure 1;

Figure 8 is ad'etail sectional view on. a .largerscale' in the planeof line VIII VIII of Figure 1; i

FigureQ' is a corner of the; door at the bottom," the view plane plane of bottom corner of the door, thesection being a detail vertical section through Figure 10 isa vertical section through a;

KALAMEIN DOOR The wooden door frame, whichis shown in Figure 2, prior to the application of the metal comprises vertical stiles 2. Thedvertical stiles are connected at the top by a top rail made of an upper piece 3 and a lower piece 4. They are connectedat the bottom by a bottom "rail comprised ofan upper piece 5 and a lower piece 6. At 7 is a middle rail. In F igure 2, the wooden frame members are shown secured together, although they are actually in practice, not secured together until each piece has been individually encased in'metal, ashereinafter described. The upper part 5 of the bottom rail has a vertically extending slot 8 therein ateach end thereof. The lower member 6 of the bottomrail has an opposed pair'of transverse slots 9 ateach end thereof, the slots9 being formed in opposite sides of the piece 6. The members 3 and 4 of the top rail are slotted just the same way as the corresponding parts 6 and 5 respectively of the bot-. tomrail. H f

Each vertical stile 2 is encased in a metal sheath 10. which conforms to the shape thereof land which fits tightly thereover. The

edges of the sheet metal sheath are brought together along the verticalinner face of the.

stile, asindicated at 11 in Figure 4, the meet ing edges of the sheath being turned outwardlyto form a double fiange downthis face of,

the strip. The metal sheath has side flaps at the top and bottom thereof designated 12, which project beyond the end of the stile, as best shown in Figure 4, when the sheath'is first put on the metal. The sheath also has metal fittedtherearound, this casing being of the rail and turnedupwardly to form a double flange 16. The endsof the casing 15' are, turned over the ends of the member 5,

designated p The opposite edges; of the metal are brought together over thetop face being transverse to the plane of the door;

as shownat' 17 in Figures4 and 6. The p0r-- tions 1'? of the metal also project into the slots 9 in the lower member 6, as best shown in Figure 7.

The middle rail 7 is enclosed in two correspondingly shaped pieces of sheet metal 18 and 19 with upturned edges 20 thereon forming double flanges along the top and bottom of the middle rail. The ends of the pieces 18 and 19 are bent over to cover the ends of the middle rail, the vertical slot 7 in the ends however, being left uncovered.

In assembling the door, the wooden part are first separately encased in metal. The end rails at the top and bottom of the door are then fitted to the stiles, the inturned flanges 14 at the ends of the stiles being received in the vertical slots 9 in the cross rails. The flange 11 on the stiles enters the slot 8 in the cross rails at the same time the middle rail is secured in place. One of the flanges 11 of one of the stiles enters a groove 7 at one end of the middle rail 7, and the flange 11 of the other stile enters the corresponding groove 7 at the other end of the middle rail.

After the end rails have been placed on the stiles as described, a small flanged metal plate 26 is placed over that portion of the Wooden rail that rests against the ends of the stile. The edges of the flanges 12 and 13 are rolled over'to form an interlocking seam around the three edges of the plate 26. The sheath 15 encasing the top and bottom rail has a flange 15 at each end thereof, and this flange is rolled over and interlocked with the flange at one end of the plate 26 to form the rolled joint 26 of Figure 10. The plate 26 not only serves to protect the wooden structure at the door together. After the panels are secured in place, metal mold1ng28 1s placed around The door isfastened together and the sheathends of the stiles, but'also forms a metallic interlock between the end rails and the stiles. This interlock is sufficient to hold the door together even if the wooden core were en tirely removed.

'After the several parts have been placedtogether, the panels 21 and 22 can be secured and spotwelding the panel to the upstanding flanges 11,16 and 20. The spotwelding of the panel further ties the several parts of the the edges of the panels on each side of the door. v

The construction of the door is such that each piece can be separately covered with metal and then the several pieces assembled;

After the door has been assembled, all of the wooden parts are completely encased 1n metal, andthe frame is rigidly secured together.

ing secured t'o'the several members in suchway thatno nails or screws necessary for holdingthe door together, pass through the ,metal intothewood. Due to'this fact, the

.will. be understood that door will remain rigid even if the Wooden core is burned out. The entire door is assembled with a minimum of parts, and the various parts are so shaped that dies for bending the metal can be easily provided. The entire construction lends itself to cheap, as well as durable manufacture.

While I have particularly shown and described one embodiment of my invention, it various detail changes and modifications may be made therein. a

I claim:

1. In a kalamein door, top and bottom rails, each of which has a metal sheathing and projecting end portions, vertical'stiles, each of which is enclosed in a sheathing, said rails being equal to the distance between the stiles, the projecting portions having a length equal to the width of the stiles, the sheathing for the vertical stiles projecting beyond the ends of the stiles and embracing'the projecting ends of the top and bottom rails, said projecting ends of the rails having transverse slots on opposite sides thereof to receive the sheathing of the stiles.

2. In a kalamein door, top and bottom rails, each of said rails having a metallic sheathing thereover and having projecting portions ateach end thereof, vertical stiles, each of said stiles having a metallic sheathing encasing the same, the metallic sheathing being longer than the stiles and projecting beyond each end of the stiles, the projecting part of the sheathing for the stiles at each corner embracing one of said projecting por tions of a top or bottom rail, thesheathing of the stile and the sheathing for the top or bottom rail being connected together across the outside of the top and the bottom of the door and being in contact along the end faces of the rails and the inside faces of the stiles.

3. In a kalamein door, top and bottom rails,

each of which is enclosed in a metal sheathin which is folded transversely over the end facesthereof to substantially cover the end faces, each rail having a projecting portion at each end thereof, a pair of vertical stiles, a sheathing enclosing each stile and projecting beyond the end of the stile at each end thereof, said projecting. portions of the rails lying against the adjacent end of a stile, said proj jecting portions of the rails being transversely slotted to receive a portion of the stile sheathing and into which the sheathing which is folded over the end faces of the rails projects.

4. In a kalamein door, top and bottom rails, each-of which is enclosed in a metal sheatha ainst the adacent end of a stile said erob n i I 1 ecting portions of the rails being transversely slotted to receive a portion of the stile sheathing, and a plate placed over each of said projecting portions and connected With the sheathing for the stile andwith the sheathing for the rail.

5. In a kalamein door, top and bottom having a projecting end portion at each end thereof, said sheathing being folded over the end faces of the rail but leaving the projecting end portions exposed, a vertical stile at each side of the door, each vertical stile having a metallic sheathing there'about whose edges are brought together to form a flange along the inner face'of each stile, the end faces of the rails being grooved to receive the flanges of the stiles, the sheathing for each stile projecting beyond the end of the stile at each end thereof and embracing the adjacent projecting portion of atop or bottom rail.

6. In a kalamein door, top and bottom rails, each of said rails having a metallic sheathing bent'thereabout with the edges of the sheathing brought together to form a flange along the inside of the rail, each rail having a projecting end portion at each end thereof, a vertical stile at each. side of the door, each vertical stile having a metallic sheathing thereabout whose edges are brought together to form a flange along'the inner face of each stile, the sheathing for each stile projecting beyond the end of the stile at each end thereof and embracing the adjacent projecting portion of a top or bottom rail, each of said rails having a vertical groove in anend face thereof adapted to receive the flange of the stile sheathing.

7. In a kalamein door, top and bottom rails, each of'said rails having a metallic sheathing bent thereabout with the edges of the sheathing brought together to form a flange alongthe inside of the rail, each rail having a pro ecting end portion at each end thereof, a vertical stile at each side of the door, each vertical stile having a metallic sheathing thereabout Whose edges v are brought together to form a flange alongthe "inner face of each stile, the sheathing for each stile'projecting beyondthe end of the stile at each end thereof and embracing the adjacent projecting portion of a top or bottom'rail, each of said rails having a vertical groove in an end face thereof adapted to receive the flange of the stile sheathing, said door also having amiddle rail having a slot at each end thereof into which a flange of the stile sheathing is entered, saidmiddlei rail being enclosed in metallic sheathing formedof two pieces, the meetingedges of each stile projecting beyond the end of the stile at each end thereof and embracing the adjacent projecting portion of a top or bottom rail, each of said rails having a vertical groove in an end face thereof adapted to receive the flange of the stile sheathing, said door also having a middle rail having a slot at each end thereof into which a flange of the stile sheathing is entered, said middle rail being enclosed in metallic sheathing formed of two pieces, the meeting edges of which form flanges along the top and bottom edges of'the rail, and panels in the door spotwelded to the respective flanges of the several members.

9. A kalamein door having vertical stiles at each side thereof and a rail at each end 9 and being connected with the sheathing for i the rail. a 10. In a kalamein door, an end rail comprising a short portion and a long portion,

a metal sheathing encasing the rail and leaving end sections of the long portion uncovered, said sheathing being bent around the ends of the short'portion and being bent into transverse vertical slots in the long por tion', the: edges of the sheathing being lbroughttogether over the inner'edge of the rail and forming a vertical flange therealong.

11. In a kalamein door, an end rail c'omprising a short portion and a long portion, a metal sheathing encasing the rail and leaving end sectionsof the long portion uncovcred, said sheathing being bent around the i ends of the short, portion and being'bent into transverse vertical slots in the long portion, 'the edges of the sheathing being brought togetherover the inner edge of the rail and forming avertical flange therealong," theends of the'short portion of the rail having vertical slots therein.

12. The method of forming a. kalainein door formed of several pieces comprising stiles and rails, which consists in placing a sheathing over the individual pieces,

thereafter assembling the several pieces, and

then forming rigid oints' between the sheathing of the several pleces of suflicient strength to rigidly hold the door together. Intestimony whereof I have hereunto set my hand.

WILLIAM MACGRUDER.

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