Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Patent
1985-08-09
1988-03-15
Murtagh, John E.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Side-by-side terminus shafts; e.g., truss
52376, 52692, E04C 302
Patent
active
047304316
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a flanged beam with a web structure formed of wire or strip-like members bent into zigzag, meander or wave shape and having their bending points secured to the flanges.
BACKGROUND
A beam of this type and a method of manufacturing it is described in e.g. Swedish Lay-Open Print No. 7610600-4. The usage of this as well as other beams is however limited by the bearing capacity and bending properties. These qualities are primarily dependent on the properties of the wooden flanges and on the degree of deformation of the wood at the points where the web of bent metal wire or strip is secured to the flanges. The wood comprised in the flanges must therefore be classified and jointed with great accuracy while complying with the stipulated rules, which is a both complicated and costly procedure. As disclosed in the published "SE-B-" No. 415 991, certain attempts have been made to overcome these drawbacks by attaching wire, extending in the longitudinal direction of the flanges, by welding it to the bending spots of the web. Unfortunately however, this has resulted in productional complications setting aside the economical profit gained by the increased rigidity and bearing capacity of the beam, despite the advantage that a lower quality of wood can be used for the flanged. In fact, welding of the wire extending along the flanges to the bending points of the web must necessarily take place prior to the anti-corrosive treatment of the wire included in the web structure, which treatment cannot be neglected. Beyond being expensive per se as it must be performed individually for each separate unit of the almost lattice-resembling webs created by the wire members welded to the bending points, this anti-rust treatment also eliminates the possibilities of rationally manufacturing finished webs by the continuous bending of an already surface-treated wire taken directly from a supply coil.
SUMMARY OF THE INVENTION
The object of the invention is therefore to suggest a novel and improved type of beam in accordance to what is set forth by way of introduction, which solves the above-described problems associated with the previously known beams and which, despite its more solid and deformation-resistant structure, enables a simplified and less expensive manufacture of beams than has been possible so far.
In order to fulfill its purpose at least in all essential parts, a beam constructed according to the invention is mainly characterized in that at least one flange has a section extending longitudinally with the flange and consisting of another material than the rest of it, and which is embedded in the flange while being cast to form an integral unit therewith and with the bending spots of the wire or strip-like member fixed thereto.
By means of embedding flange sections into the beam flanges, these sections thereby forming a unit not only with the flange but with the web as well, this web structure can be manufactured in a most simple manner from already surfacetreated wire or strip material taken from a storage coil, the invention simultaneously safeguarding a particularly stable deformation-reluctant connection between the bending points of the web and the flanges.
A further, especially important advantage gained by the invention is that the main part of the rigidity and the supporting capacity of the completed beam can, if desired, be transferred to the embedded flange sections, whereas the design of remaining flanges and the material selected therefor can be adapted primarily for nailing and screwing, temperature insulation or any other desirable purpose. As a consequence for example, the quality of the wooden flanges need not be too high, and neither the classification nor the splicing or jointing of the wood need be done with the aid of any sophisticated or costly methods. With the appropriate dimensions and a suitable material selected therefor, the embedded flange sections will constitute the elements taking up most of the load in the beam, relieving in this way the wooden material in
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patent: 1936147 (1933-11-01), Young
patent: 2558946 (1951-07-01), Fromson
patent: 3452502 (1969-07-01), Price
patent: 3813843 (1974-06-01), Troutner
patent: 4159606 (1979-07-01), Kindberg
patent: 4372093 (1983-02-01), Ericsson
patent: 4454695 (1984-06-01), Person
Murtagh John E.
Rudy Andrew Joseph
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