Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Patent
1987-01-07
1989-04-11
Friedman, Carl D.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Side-by-side terminus shafts; e.g., truss
52729, E04C 300
Patent
active
048194000
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a beam comprising wooden flanges and a web interconnecting said flanges and consisting of metal rods inclined relative to each other parallel to the plane of the web like the bars in a trapezoidal curve.
Beams of this type are previusly known in different embodiments. In one of these embodiments, the beam web is made of short metal pieces which have specially designed ends adapted to the flanges and connected thereto by means of bolts and/or corrugated joint fasteners. An example of such a beam is shown in DE-A No. 857,139. Such a beam is difficult to manufacture, and cost-effectiveness is possible only for large dimensions. Another beam has a metal web in the form of a zigzag or sinusoidally bent wire or rod whose turning points are enclosed in correspondingly shaped recesses between flange-forming ribs which are glued together. This is a considerably better solution where, although the web and the flanges are interconnected in a rational way, a good transmission of forces therebetween is obtained when the beam is used, and the beam may be manufactured at a profit also in smaller dimensions. However, one problem with this type of beam is that it can only be factory-made by means of a relatively complicated equipment. This also means that the beams are marketed but in few dimensions, which often entails that the construction in which the beam is used will be overdimensioned and thus unnecessarily expensive. Finally, attempts have been made to manufacture a beam of the last-mentioned type by gluing the turning points of the zigzag or sinusoidally bent wire in inwardly facing recesses of the beam flanges. However, to a person skilled in the art, it seems somewhat hazardous to use such a beam, since there is no mechanical joint between the web and the flanges, but only a glue joint which may easily break because of movements in the flanges and/or the web.
One object of the present invention is to provide a beam which has easily assembled members and which can readily be dimensioned for the current need. In principle, it should be possible even for a user who is not an expert to call on his supplier of building material and account for his needs, whereupon the supplier should be able, from simple tables, to determine the beam dimensions and furnish the material precisely required. By means of this material, the user will then be able readily to manufacture the beam or the beams on his own. Of course, this concept does not prevent the beam from being industrially manufactured in a rational and advantageous way be means of simple machines. This object is achieved in that the opposite end portions of each metal rod are bent and have a length which does not exceed the flange thickness, that a washer is provided at the transition between the central portion of the rod and the respective end portion, and that the end portions are secured in bores in the beam flanges with the washer accommodated with close fit in a recess around the bore.
The invention further relates to a method for producing a beam comprising wooden flanges and a web interconnecting said flanges and consisting of metal rods inclined relative to each other parallel to the plane of the web like the bars in a trapezoidal curve. This method is characterised in that bores with recesses are provided at predetermined intervals in elongate pieces of wood forming the flanges, that washers of plastic or metal having a central opening are applied in said recesses, and that end portions of the metal rods which are bent bent in the same plane and at the same angle but in the opposite directions are pressed through said washers and into the bores. The beam webs can be produced in a rational way in that rods are bent into a trapezoidal curve having straight parallel portions alternating with inclined ones, that the bent rods are disposed with corresponding formations in the transverse direction opposite one another but in "antiphase", that straight parallel wires, bars or strips are disposed transversely of the positioned bent rod
REFERENCES:
patent: 368687 (1887-08-01), Rogers
patent: 3778946 (1973-12-01), Wood et al.
patent: 4069635 (1978-01-01), Gilb
Friedman Carl D.
Larsson Bjorn
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