CZ110896A3 - Door made of steel plate - Google Patents

Abstract

A sheet-steel door, especially a fire-door, with a box structure (1) forming one large face of the door leaf and a cover (2) forming the other large side which is secured at its edge regions (3) to outwardly projecting strips (4) in the box-section edges parallel to the plane of the large faces, in which an edge section of the edge regions (3) of the cover (2) or of the edge strips of the box-section edges to form the contact region of a fold (7) is angled towards the box section (1) and extends over the connecting region (5). Said sheet-steel door is designed for substantially easier handling and a better joint between the box section and the cover in that the edge section (6) has a first bend forming a web (8), the width of which determines the top of the fold, and a second bend forming the contact region (9) which projects over the connecting region (5) at a distance of about the web width.

Description

Technical field

The invention relates to a steel sheet door, in particular in a fire-resistant design, which consists of a housing forming one side of the door leaf and a housing forming the other side of the door leaf which is connected at its edges, preferably by spot welding, to the edge strips of the housing; In order to form an abutment engagement area on the housing, an outwardly curved edge region of the housing edge or housing edge strip overlaps the joining area.

BACKGROUND OF THE INVENTION

Door designs of this kind are known, both in the thin fold design and in the thick fold design.

In the thin fold design, the skirt of the overlapping edge strips bent at the edges of the housing in the region of this overlap is spot-welded so as to produce a door leaf corresponding to the thickness of the housing by its thickness. The casing has original dimensions that extend beyond the edge strips of the casing, i.e. it is provided with edges which, after spot welding, fold back at 180 degrees to the edge strips of the casing. In this way, a three-layer fold of low thickness penetrates, the curved edge of the shell overlapping the spot weld in the joint region between the edge strips of the housing and the edge of the shell. This state is shown schematically in FIG. 2.

In the prior art, a thick folded door also consists of a housing and a sheath, the housing being of a thickness corresponding to the thickness of the thin folded door. fold thickness. The skirt is provided at its peripheral portion which extends beyond the housing with a bridge curved at right angles to the plane of the skirt.

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This bridge is adjoined by a bearing area which is bent toward the housing, which overlaps the housing edge strip and, with its free edge, extends into the corner region between the housing body a; its edge band. At this point, a fillet weld is provided, which is disadvantageous in terms of possible injection molding of the welded material and the tan. Especially disadvantageous and therefore technologically unsuitable is the fact that, in such a thick folded door, the casing, which has bends at its edges, can only be brought into the welding position with the housing by sliding in the longitudinal direction of the curved edges. m inconvenient process, which additionally requires considerable space.

This method of manufacturing the door is schematically indicated in Fig. 3.

SUMMARY OF THE INVENTION The object of the present invention is to find a construction of a thick folded door which consists of a housing and a casing. The design is to be substantially less labor intensive and to be associated with fewer problems in connecting the housing to the housing.

SUMMARY OF THE INVENTION

The problem is solved and the drawbacks of the known thick-fold steel sheet door of this kind largely eliminate the steel-sheet door according to the invention, which is characterized in that the edge region consists of a first bend forming a bridge defining its fold width to which it adjoins. a second bend forming an abutment region that extends beyond the joining region at a distance approximately equal to the width of the web.

The embodiment of the thick-fold steel sheet door according to the invention is based on the idea of allowing spot welding to facilitate handling and this spot weld has also been protected against corrosion. This is achieved so that the pre-bent edge region of the housing is not initially bent completely into its final bent position, so that the connecting region between the housing edge strip and the housing edge area is accessible in a direction perpendicular to the plane of the housing upon application of the housing. Spot welding equipment can be used. Only after the spot weld has been made, the prepared seating area of the sheath with the reinforcing edge is bent further towards the housing, so that the seating area of the fold then spacers over a spot-welded connection area between the edge strip of the housing and the edge area of the housing.

According to the invention, it is thus achieved that the connection between the housing and the housing can be done by spot welding and that simply placing the housing on the housing or vice versa is sufficient, so that an uncomfortable sliding of the pre-bent housing on the housing is not required.

In principle, it is possible for the bridge with the abutment region to be formed on the housing, possibly in connection with its edge strip. However, it is more advantageous to form this fold on the housing, since the free edge of the housing edge strip is also simultaneously retained. .

It is preferred that a further bending forming the stiffening edge adjoins the bending forming region of the bending abutment towards the joining region. '. ·, "

Finally, it is preferred that the angle between the stiffening edge and the abutment region is less than 90 degrees.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is further elucidated by means of non-limiting examples thereof, which are described on the basis of the accompanying drawings which show:

1 shows a view of the edge of a steel sheet door according to the invention,

AND

FIG. 2 is merely illustrative of a view corresponding to that of FIG. 1, but of a thin-fold steel sheet door.

FIG. 3 is merely illustrative of a view corresponding to the views of FIGS. 1 and 2, but of a thick-fold steel sheet door according to the prior art.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 schematically illustrates the edge of a sheet steel door according to the invention. The door casing 1 is provided at its edges with edge strips 4 extending outwardly parallel to the plane of the door and abutting the edge 3 of the door casing 2 when the casing 2 and the casing 1 are in an interconnected state. In this state, spot welding is carried out between the housing edge strip 4 and the housing edge 3, which is indicated by the welding tools shown schematically in the left-hand part of FIG.

It can also be seen from this left-hand part of FIG. 1 that the skirt rim 3 in its peripheral portion 6, which extends outwardly from the joining area 5, is pre-bent to form a thick fold 7 by adjoining the joining area 5. a bridge 8, which is at right angles to the abutment region 9, which ends with a reinforcing edge 10 which is bent more than 90 degrees to it and which points towards the joining region 5. From the left part of FIG.

1 it is also apparent that the bridge 8, which essentially determines the thickness of the fold 2, is only bent at an angle less than 90 degrees relative to the plane of the housing 2 in the preparatory position so that the spot welding tool can contact the connecting region 5 between the housing 2 and the housing 1. After the spot weld has been made, the entire edge portion 6 of the edge 3 of the housing 2 is then further bent to its final position so that the web 8 is bent at right angles to the plane of the housing 2. From the right part of Fig. 1 the resulting configuration of the steel door is then visible

By means of which the seating area 2 of the thick fold 7, which overlaps the connecting area 5, is achieved through extremely simple and inexpensive manufacture and simple handling and joining.

Claims (3)

PATENT O 1. Sheet steel doors, in particular in fire-resistant construction, consisting of a cabinet forming one side of a door leaf and a casing forming the other side of the door leaf, which at its edges is preferably spot-welded, connected to the edge strips of the housing . extending parallel to the plane of the wider side of the door leaf, the joining area for forming the abutment engagement area on the housing outward is adjoined by a curved edge area of the skirt edge or the edge band of the housing and this fold overlaps the joining area. (6) consists of a first bend forming a web (8) defining the width of the bend (7) by its width, followed by a second bending forming web (9) which overlaps the connecting region (5) with a distance approximately equal to the width of the web (8). Door according to Claim 1, characterized by. in that the bending forming region (9) of the fold (7) is connected to the bending region (5) by a further bending forming the reinforcement. border (10). Door according to claim 2, characterized in that the angle between the reinforcing edge (10) and the abutment region (9) is less than 90 degrees.