Woodworking – Process – Mechanical cutting or shaping
Reexamination Certificate
1999-07-16
2001-06-05
Bray, W. Donald (Department: 3725)
Woodworking
Process
Mechanical cutting or shaping
C144S003100, C144S039000, C144S242100, C144S246100, C144S250240, C144S367000, C144S357000
Reexamination Certificate
active
06240988
ABSTRACT:
The invention relates to a process for machining of tree trunks to produce octagonal or polygonal dressed timbers in which on a tree trunk in a first machining step two vertical side surfaces are produced, whereupon the tree trunk is turned 90° and in a second machining step two more vertical side surfaces are produced, and a device which is especially suitable for executing the process.
Increasing the usable cross section of tree trunks by cutting them on four sides and with rough edges remaining between the four sides, resulting in a larger remaining wood mass, is known. If boards are to be cut from the tree trunks the rough edges are cut in stages in a subsequent step such that straight edges form in the subsequently cut boards.
The object of the invention is to devise a process and a device for machining of tree trunks in which the usable wood cross section of the tree trunks is improved or enlarged.
Compared to the above described form of machining, octagonal or dodecagonal cutting of a roughly round cross section yields a greater useful wood volume. When boards are cut from the tree trunk machined by the invention, they already have bevelled edges which are especially well suited for roofs and jointed timbering (weather boarding).
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Bray W. Donald
Wol Systembau Gesellschaft m.b.H.
Young & Thompson
LandOfFree
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