Joints and connections – Having a joining piece extending through aligned openings in...
Patent
1994-06-08
1996-06-25
Knight, Anthony
Joints and connections
Having a joining piece extending through aligned openings in...
4034061, 411409, 411919, 811242, 811762, F16B 1214
Patent
active
055294286
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the further development and supplementation and completion of the connecting techniques and of the connecting elements used here.
The invention relates in particular to a metallic structural element for connecting workpieces consisting of wood, woodworking material, such as particle board, laminated board or plastic, based on the groove-and-tongue principle.
PRIOR ART
Structural elements based on a large number of connecting techniques for the assembly of several workpieces are known in interior decorating and in joinery, especially furniture making. In general, the object is to join more or less flat surfaces of adjacent individual parts to form a whole. Such connections may be detachable or nondetachable. The latter include in particular glued joints. Most frequently, the basic forms are flat surfaces abutting one another or meeting one another at right angles.
A known type of connection is based on the groove-and-tongue principle. The workpieces to be joined are each provided with a continuous groove or individual separated narrow slots into which an intermediate piece, the so-called "tongue" is inserted. In principle, this is known as keying from mechanical engineering. In order to produce a good non-positive connection, it is as a rule necessary to glue the tongue to the workpieces to be connected, in the groove. Another type of connection consists of the so-called clamping iron, a flat lug which is provided with holes and becomes a threaded bolt, generally in the form of a wood screw, at one end. Another type is the so-called Ringers' bracket, a U-shaped cylindrical metal rod which is used generally as a shelf support (e.g. bookshelves).
The known connecting elements are very unsatisfactory. The classical groove-and-tongue connection is as a rule not particularly suitable for the transmission of relatively large forces. Furthermore, it is very seldom detachable without damaging some part involved. The clamping iron is unattractive and must be inlet, countersunk and if necessary covered, thus involving additional work. The Ringers' bracket can be used only in specific cases and is not universally applicable.
There is therefore a great need for further development of connecting elements for, as far as possible, universal use in interior design, joinery, the household and the leisure and hobby sector.
The following documents are cited in connection with the prior art:
SUMMARY OF THE INVENTION
It is the object of the invention to provide a metallic structural element for connecting workpieces consisting of wood, woodworking material or plastic, based on the groove-and-tongue principle, which ensures a satisfactory non-positive connection of a plurality of workpieces without danger of tearing or breaking off. The connection should include the possibility of detachment at any time without any damage to the workpieces. The connecting element should be simple and convenient to use and to handle, without requiring expensive special additional tools. The structural element should be suitable for economical mass production and should be as universally applicable as possible.
This object is achieved if the metallic structural element mentioned at the outset consists of a flat lamellar part providing the non-positive connection with the first workpiece provided with a groove or a slot and a transverse hole and a bolt-like part which, through screwing or pinning, provides the non-positive connection with the second workpiece provided with a longitudinal hole and which rests on the lamellar part with its end face at right angles and is firmly connected to the said second workpiece, and if the lamellar part has, at its center, along the axis of the bolt-like part, a hole which is perpendicular to the plane of the lamella and is intended for fixing the first workpiece by means of a screw or of a pin.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described with reference to the following embodiments illustrated in detail by the figures.
FIG. 1 shows a sche
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