Movable or removable closures – Frame with closure feature
Patent
1992-06-04
1994-03-22
Cuomo, Peter M.
Movable or removable closures
Frame with closure feature
52211, E06B 104
Patent
active
052953270
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a sheet metal door frame of the type comprising a head piece and a pair of square-cut jambs.
BACKGROUND OF THE INVENTION
Sheet metal door frames offer a simple and highly cost effective alternative to conventional wood frames, and are often installed in doorways of plasterboard walls in offices and similar environments.
The state of the art in the market today is represented by a great number of more or less complicated frame constructions, where head pieces and jambs are joined together by means of a vast variety of tongue elements and slits. The tongue elements can for instance be of the kind used in tinplate toys where the tongue is guided through the slit and bent down on the rear side of the plate. The tongue elements are normally either stamped out from the frame profile, or added by welding or other means as separate parts to the frame profiles. Other known solutions may include intricate angled joint pieces onto which the head piece and jambs are fastened.
A drawback of the majority of the above-mentioned solutions is that the frames become difficult to install on-site by craftsmen. However, it is highly desirable that the frames may be easily installed even by an unskilled craftsman. An additional and no less important drawback of existing frame constructions is the complicated shape of the metal profiles, resulting in high manufacturing costs, for example in terms of expensive cutting and stamping machinery, as well as an increased number of necessary work operations. Yet another problem is that the craftsman of ten has to hold the head piece in position, or fasten it by screws, until the jambs are fixed in their vertical positions.
It is thus an object of the present invention to alleviate the above problems by providing a cheap and simple sheet metal door frame and a method of installing such a door frame in a doorway which can be performed even by unskilled craftsmen.
SUMMARY OF THE INVENTION
In accordance with the present invention these and other objects have been achieved by means of a sheet metal door frame comprising a substantially horizontally arranged U-shaped head piece and a pair of substantially vertically arranged likewise U-shaped jambs, square-cut ends of which jambs extend into cut-outs at opposite ends of said head piece, said head piece and jambs presenting side walls, each of which terminates in a free longitudinal end at which an outwardly bent flange is provided for attachment of architraves, said head piece further presenting hook-shaped end portions formed in its side walls at said opposite ends, which hook-shaped end portions are arranged to overlap end portions of the corresponding side walls of the jambs so as to engage the outwardly bent flanges of the jambs.
In accordance with one embodiment of the door frame of the present invention, the hook-shaped end portions are arranged to engage substantially horizontal edge surfaces of said flanges.
In accordance with another embodiment of the present invention, the edge surfaces are located in a plane defined by the square-cut ends of the jambs.
In accordance with yet another embodiment of the present invention, the hook-shaped end portions are arranged to pass through slit-shaped openings in the flanges adjacent to the square-cut ends of the jambs.
Further in a preferred embodiment, the side walls of at least the head piece are slightly inwardly inclined toward their free longitudinal ends. A clamping effect is hereby created, thereby facilitating the installation of the door frame in a doorway. The angle of inclination of the side walls may favorably be within the interval 0.5.degree. to 6.degree., preferably 4.degree..
Furthermore, in the preferred embodiment the side walls of the jambs are each provided with a screw hole at a predetermined location relative to the square-cut ends, said screw hole being aligned with a corresponding screw hole in the overlapping side wall of the head piece.
The invention also provides a method of installing a sheet metal door f
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Cuomo Peter M.
Redman Jerry
Swedoor AB
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