Static structures (e.g. – buildings) – Ornamental: color – thickness variation – or dissimilar... – Wood grain pattern arrangement
Patent
1997-06-16
1999-02-02
Canfield, Robert
Static structures (e.g., buildings)
Ornamental: color, thickness variation, or dissimilar...
Wood grain pattern arrangement
527307, 156264, 144346, 428 58, 428106, 428535, 4285371, B27B 100, B27M 300
Patent
active
058650024
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a joint arrangement in connection with the manufacture of a wood element blank, especially a wood board blank or a wood beam blank, in which arrangement the wood element blank is arranged to be formed of several blank battens that are arranged to be interconnected with an adhesive, whereupon each blank batten is formed to have at least partly substantially triangular cross-section, so that it may rest on at least four adjacent blank battens, and that the apex of the triangular part of each blank batten remains inside the wood element blank.
Such wood element blanks are at present very well known in different fields of technology. However, the previously known wood boards have often been manufactured in such a way that each blank batten only rests on two adjacent blank battens. The problem of such a board is, however, that for example its strength and processing properties are not the best possible. Another drawback is that the pith of the wood will often be on the surface of the board, wherefore the end product is not the best possible aesthetically. A further drawback of the prior art is that it has not always been exactly simple to provide for example curved surfaces. Examples of such arrangements are described in the PCT patent application WO 89/04747 and in European Patent Application 0 027 488.
Board arrangements wherein each blank batten rests on more than two adjacent blank battens have also been developed in the field. An example of such arrangements is disclosed in German Patent 290 153. One of the drawbacks of this known arrangement is that the pith of the wood will be on the surface of the board. Another disadvantage is the unfavourable orientation of the wood fibres. This drawback leads to problems with strength, since wood stretches and contracts in different ways in the direction of the fibres and perpendicularly to the fibres.
The purpose of the invention is to provide a joint arrangement by means of which the prior art drawbacks can be eliminated. This is achieved with the joint arrangement according to the invention, characterized in that each blank batten is formed with substantially radial cleavings, so that the pith of the wood remains at the apex of the triangular part of the blank batten.
An advantage of the invention is for example that the cracking tension or warping tension are not significantly transferred to the board or beam.
Therefore, the arrangement is applicable in almost all timber species. Another advantage of the invention is that the knots will be positioned at such an angle to the surface that is as advantageous as possible, i.e. perpendicularly to the surface. The aforementioned feature is highly advantageous with respect to the appearance and the processing. Furthermore, the pith of the wood will never be on the surface, because if it is not completely removed during the processing it will remain inside the board. Another advantage is that each blank batten rests on several other battens, wherefore the end product will be highly advantageous, for example either straight, curved or twisted in a controlled manner, as well as uniform in quality and more elastic in every direction than previously. The board surfaces are systematically formed from the best part of the wood, and the direction of the fibres is highly advantageous with respect to stress. Additional strength is provided by a straight and diagonal plain joint that is about 20% wider than in the previous arrangements. Another advantage of the invention is that it is easy to implement, whereupon the production line will be simple, rational, effective and inexpensive. Another factor contributing to faster and easier manufacture is that each blank batten fits in its place only the right way round. The arrangement according to the invention can be applied both in manual and automated manufacture of boards or beams. A further advantage of the invention is its considerably higher yield compared to the prior art. Another advantage is the possibility of utilizing a considerably wide variety of r
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