Collapsible Door-fitting Frame

Abstract

This invention provides a door-fitting frame of collapsible type which is mounted securely in a door opening provided in a concrete wall and in which a door is fitted later. This frame, very simple in construction and easy in fabrication, offers an advantage over the known rigid type in that it is transportable in a disassembled state and the necessary assembly or fabrication work is done after the component parts are transported to the place of work.

Description

BACKGROUND OF THE INVENTION

Whereas up to present, these door-fitting frames have been made by welding vertical and horizontal frame members at their both ends to be framed into a rectangular shape, it had a drawback in that the transportation of such a rigid rectangular frame was both inconvenient and uneconomical.

Under the present invention, however, it has become possible to provide a door-fitting frame of collapsible type by fabrication or assembly work, thereby overcoming the drawback encountered with the known type of frame. The present invention permits a door-fitting frame to be transported or carried in a disassembled state to the place of work where the frame components are assembled into a finished rectangular frame without requiring a welding work.

SUMMARY OF THE INVENTION

The present invention relates to a door-fitting frame of collapsible type which is mountable in a concrete wall to be fitted later with a door and the present invention has for an object to provide a door-fitting frame which is easily and economically transportable. Another object of the invention is to provide a door-fitting frame which is of simple construction and easy fabrication and a still further object is to provide a frame which has reinforced joints.

The nature and advantages of the present invention will be known more clearly from the following descriptions made with reference to the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 represents a perspective view, partly in section and exploded, of a door-fitting frame under the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawing, the frame of the present invention is composed of right and left vertical frame members A A of identical shape, all of which being made of C-shaped convex steel constructed such that it has a flat-topped raised part 1 running longitudinally and centrally thereof over its total length, oppositely disposed tiered parts 2 2 on its both sides, inwardly bent edges 3 3 formed at the outer ends of the said tiered parts 2 2 respectively by bending the ends of the respective tiered parts twice at right angles with the result that the end of each said tiered part is formed into an inwardly projecting edge underneath said part 2. The above frame members made of C-shaped convex steel are open at their rear side.

Both ends of the vertical frame member A are left in transversely-cut section and, on the raised part 1 at a position close to said ends of the vertical member A are provided a set of opposed up-turned hook means 4 4 formed by slitting and then raising part of surface of the raised part 1.

At each end of the horizontal frame member B is formed an indent 5 by cutting off the end of its flat-topped raised part 1, which will accommodate the raised part 1 of the vertical member A therein. Secured to the cut end of said indent 5 by mean of welding is an end cover plate 6 which carries a pair of opposed cut-outs 6' 6' to be engaged by the hook means 4 4 formed on said vertical frame member A. This end cover 6 may be formed by bending downwardly and then welding to the indented end 5, the end surface of the raised part 1 after slit at both sides, instead of its being cut off when the indent 5 is provided.

It is also desirable that end covers 7 7 are rigidly fixed, by means of welding, onto a pair of opposed openings or holes formed by and between the projecting tiered parts 2 2 and bent edges 3 3 of the frame member B, since, by so doing, strong link or joint can be obtained in subsequent framing work at which time the ends of the tiered part 2 2 of the vertical member A contact said end covers 7 7 closely to provide strong linking. The provision of end covers also serves to facilitate rigid linking by means of screw means as explained later.

The linking or union of the vertical frame members A A and horizontal members B B is effected in the following manner. The ends of the vertical members B B are brought into contact with the upper and lower ends respectively of the horizontal members A A so that the end surface of the tiered parts 2 2 and the inwardly bent edges 3 3 of the members B B knock against the tiered parts 2 2 of the vertical members A A, whereupon the raised part 1 of the vertical members A A engages in the indent 5 of the horizontal member B B, and simultaneously the cut-outs 6' 6' of the end cover 6 secured on the indent 5 are engaged by the up-turned hooks 4 4 of the raised part 1 of the vertical member A.

The rectangular support frame thus assembled is sufficiently secure and rigid not only because of engagement of the raised part 1 of the vertical frame members A A in the indent 5 of the horizontal frame members B B but also due to the firm engagement of the hook means 4 4 of the vertical members A A into the cut-outs 6' 6' of the vertical members B B. If, however, more secure and stronger union of the frame members is desired, the end cover plates 6 and 7 of the horizontal members B B may be united with the oppositely-located raised part 1 and tiered parts 2 2 respectively by means of a screw 8. 9 indicates a hole through which the screw 8 is driven.

In the door-fitting frame thus completed, the raised sides 1 of the four convex frame members A A B B constituting the frame face inward and their open back sides C outward. Under this arrangement, the door-fitting frame is mounted loosely in a door opening provided in a concrete wall and then concrete is poured in the opening of the back side C of each frame member contacting the edge of the door opening until it fills up all the space between the frame and the edges of the door opening, whereupon the back sides of the frame members are buried completely in the concrete, thereby giving an appearance as if the frame were fitted in the concrete wall from the beginning. In this way, the mounting of the frame in the door opening is effected.

In this case, however, it is preferable as shown in the drawing to secure a connecting metal member 11 having a pair of opposed support legs 11' onto the inside of the open rear part C of the vertical frame member A. This connecting member 11 is fixed to the iron frame of the concrete wall by means of welding before concrete is poured in. Accordingly, the provision of the metal member 11 serves to facilitate proper positioning of the frame against the door opening in the wall.

The operation of fitting a door to the frame thus mounted in the wall is accomplished by a set of hinges 10 provided at the outer edge of the tiered part 2 of the vertical frame member A.

As described hereinbefore, whereas the known type of a door-fitting frame in which a rectangular frame was formed rigidly by welding the joints of the frame component members presented a disadvantage in transportation, the door-fitting frame under the present invention gives an advantage over the known type in that the former was designed to be collapsible, thereby making it possible to transport the frame in a disassembled state and fabricate the component parts i.e. members A B into a rectangular form after delivered to the place of work.

Furthermore, this new frame is of easy fabrication in that it is fabricated simply by placing the end surface of the horizontal frame member B on the end portion of the vertical member A and engaging the hook means 4 of the member A into the cut-out 6' of the member B. Still further, by reinforcing the joints of the frame members A B by a screw after assembled, stronger union can be obtained.

Claims

I claim

1. A door-fitting frame of collapsible type comprising right and left vertical frame component members of identical C-shaped convex steel consisting of flat-topped raised part formed longitudinally and centrally, a tiered flat part formed on both sides of the raised part, an inwardly extending edge formed at the outer edge of each said tiered part by bending the outer edge of said tiered part twice at right angles, a pair of opposed up-turned hook or catch members provided on said raised part at a position close to the upper and lower ends of each vertical member, upper and lower horizontal component members of a shape similar to that of said vertical frame members, an indent formed at both ends of each said horizontal member by cutting off the end of its raised part, an end cover plate rigidly secured to the end surface of said indent, said cover plate carrying cut-outs to be engaged by said hook or catch members so that a rectangular frame may be fabricated by bringing both ends of each horizontal member into contact with the upper and lower ends of each vertical member and having the ends of the tiered part and bent edge of the horizontal member also in contact with the tiered parts of the vertical member, thereby causing the raised part of the vertical member to engage in the indent of the horizontal member and causing the hook means of the vertical member to engage in the cut-outs of the horizontal member, whereupon the vertical and horizontal frame members are firmly joined at their ends to form a rectangular frame.

2. A door-fitting frame of the type claimed in claim 1, in which the end of the raised part of the vertical frame member and the oppositely located end cover of the indent of the horizontal frame member are secured together rigidly by means of a screw.

3. A door-fitting frame of the type claimed in claim 1, in which a cover plate is fixed onto the end surface defined by and between the projecting ends of the tiered part and inwardly bent part of the horizontal frame member which contact the tiered part of the vertical frame member.

4. A door-fitting frame of the type claimed in claim 3, in which the cover plate fixed onto the projecting ends of the tiered part and inwardly bent part of the horizontal frame member and also the oppositely located end of tiered part of the vertical frame member are secured together rigidly by means of a screw.