Static structures (e.g. – buildings) – Machine or implement
Patent
1991-01-25
1993-05-04
Cuomo, Peter M.
Static structures (e.g., buildings)
Machine or implement
100144, 100155R, 527313, 5274519, E04C 330, B30B 300
Patent
active
052070468
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a wooden structure and to a roller press designed for use in the production of elongated wooden structures as defined in claim 1.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,394,409 proposes an elongated wooden structure consisting of four pieces of a sectorial cross-sectional form which, when glued together, form a tubular beam of a square cross-section.
At present, as the numbers of massive tree trunks are decreasing, saw mills are receiving increasing numbers of trunks of a small diameter, from which it is not always possible to produce sawn timber of sufficient size. In the above-mentioned U.S. Pat. No., this is achieved by sawing the wood into pieces of a triangular cross section which are then joined together to produce larger bodies. However, such a structure has the drawback that the wood has to be sawn expressly for this purpose, whereas normally the wood is sawn into pieces of a rectangular cross section.
Previously known are also different tubular structures made of boards joined using various, generally metallic holding means, e.g. nails or angle iron fasteners. However, such structures are difficult and expensive to manufacture industrially, and their strength is generally of a low order.
SUMMARY OF THE INVENTION
The object of the invention is to eliminate the drawbacks referred to and to achieve a wooden structure which can be easily assembled from essentially rectangular pieces and is well suited for industrial production. Another object of the invention is to create a roller press designed for industrial production of the wooden structure of the invention.
As for the features characteristic of the invention, reference is made to the claims.
The elongated wooden structure of the invention consists of four pieces having essentially uniform dimensions in both the transverse and longitudinal directions and an essentially rectangular cross-sectional form, which are joined together and extend from one end of the structure to the other. According to the invention, one of the broader sides of each piece is provided with jointing grooves extending from end to end of the piece, while one of the narrower sides is provided with tongues corresponding to the grooves, so that the pieces can be joined together to form a hollow tubular structure.
Said pieces are preferably fully identical in cross-sectional form, so that they can be manufactured using the same cutter construction. The resulting wooden structure is a tubular body of a square cross section.
In another embodiment of the invention, the structure is of a rectangular cross-sectional form, in which case the pieces on opposite sides are identical and the structure can be used as a beam of either flat or elevated cross section, depending on practical requirements.
The structure of the invention has many advantages over previously known wooden structures. It can be made of the lower-quality, rough-edged surface boards that are always produced in the sawing of timber, because the rough-edge sides can be hidden inside the structure if the boards are correctly planed. In this way, it is also possible to produce completely knotless wooden structures from surface boards.
The structure is easy to produce in a continuous process because, due to the strength of the structure, successive pieces can be glued together end to end using only butted joints or, if desirable, finger joints.
The structure is symmetrical and rigid. It does not bend like beams made of solid wood. Also, the structure requires less and lower-quality wood material than corresponding solid-wood timber with the same strength properties.
Further advantages over thicker timber are that the pieces will dry faster and require less drying energy, and that they can be better and more quickly impregnated, if necessary.
The wooden structure of the invention can be used e.g. in the skeletal structures of buildings, in various load-bearing structures, door frames, fence poles, table legs etc. Moreover, the cavity inside the structure can be used as a duct for th
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der Mobelau, Fritz Spannagel, Otto Maier Verlag, Ravensburgh, 1954, pp. 81-83.
Cuomo Peter M.
Jatwood Oy
Milano Michael
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