Static structures (e.g. – buildings) – Machine or implement
Patent
1991-02-01
1992-09-08
Chilcot, Jr., Richard E.
Static structures (e.g., buildings)
Machine or implement
52737, 52743, 52404, 52690, 52745, 52732, E04C 329, E04C 314, E04B 176
Patent
active
051447851
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a girder for building purposes, comprising two mutually spaced elongated wood bands or members extending substantially parallel to each other and a sheet-like web rigidly interconnecting the bands.
Such girders are already known through for, example, U.S. Pat. No. 4,336,678, FR patent 1 230 119, and SE published patent application 389 883, and they are generally called "light girders". Girders of this type are used, instead of girders of solid wood, to achieve two main advantages which light girders have over solid girders. First, a "light girder" requires considerably less material and is therefore cheaper than a solid girder. As a consequence of this, it will of course be easier to handle because of its low weight. Secondly, because of the thin web a considerable reduction of thermal conductivity is obtained, i.e. conduction of heat (or cold) through the girder is made more difficult, as compared to the solid girders.
The girders hitherto known of the type mentioned in the introduction could only be used as walls, floors and the like when buildings were originally erected, but they could not be used for application on existing building surfaces, such as external walls or garret floors to effect additional insulation. The reason for not using the so called "light girders" for these purposes is that they could not be applied in a rational way by nailing, screwing or the like on a large existing surface. Solid girders have therefore been used in this type of additional works on existing buildings, and by that material as well as insulating capacity, are lost as compared to light girders.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to inconveniences mentioned above of the girders already known of provide a "light girder" which solves the problems of conventional girders and can be used on existing large building surfaces with the advantages discussed above. The light girder according to the invention is also well suited for use in, for example, roofs, walls and floors in the original erection of buildings.
Through the fact that the two elongated wood bands are arranged on opposite flat sides of the sheet-like web, it is easy to apply the girder according to the invention on a building surface through one of the two elongated wood bands, since the other band is not in the way when nailing, screwing or the like through the band in question, and at the same time the stability and rigidity of a plurality of spaced girder is assured by the transversal wood bands or member.
Preferably, but not necessary, the girder is applied on the building surface in question through the elongated wood band arranged on the opposite flat side of the web with respect to the transversal wood bands, since in such a case on one hand the transversal bands may not be in the way when applying the girder, irrespective of where this is accomplished along the elongated wood band, and on the other the elongated wood band located on the same side as the transversal bands may become the support from the transversal bands when applying an outer covering, such as a wall covering, on the outside of the frame work formed by several girders arranged on a building surface.
The girder according to the invention is naturally also adapted for new constructions, but it has the greatest advantages as compared to the girders of the prior art in the application on existing buildings, for instance in order to provide additional insulation.
Further advantages and advantageous characteristics of the invention will appear from the following description of a preferred embodiment of the invention.
With reference to the appended drawings, below follows a specific description of an embodiment according to the invention cited as an example.
In the drawings:
FIG. 1 is a perspective view of a preferred embodiment of the girder according to the invention.
FIG. 2 is a perspective view of the girder according to FIG. 1, but from the opposite direction.
FIG.
REFERENCES:
patent: 1888841 (1932-11-01), Wenzel et al.
patent: 2172048 (1939-09-01), Johnson
patent: 2886857 (1959-05-01), Brosenius
patent: 2896278 (1959-07-01), Wasserback
patent: 4724651 (1988-02-01), Fligg
patent: 5079894 (1992-01-01), Lau
Canfield Robert
Chilcot Jr. Richard E.
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