Static structures (e.g. – buildings) – Machine or implement
Patent
1986-01-06
1987-12-29
Friedman, Carl D.
Static structures (e.g., buildings)
Machine or implement
52730, E04C 312
Patent
active
047151625
ABSTRACT:
A wooden joist is described which includes a pair of flange members each having a tapered groove therein and a web member with two tapered outer edges that are glued into such grooves. The tapered outer edges are formed by cutting with a rotating cutter head to provide such edges of substantially uncompressed wood. Glue vent slots are provided at positions spaced along the length of such edges to allow glue to escape from the grooves by flowing through such vent slots. The vent slots are cut to a uniform depth into the sides of the tapered edges by feeding the web member between two pairs of cutting wheels each having raised cutter projections spaced along the surface of the wheel and extending at the same angle as the sides of the tapered edges. Preferably, the web member is made of oriented strand board, while the flange members may be made of laminated veneer lumber.
REFERENCES:
patent: 1377891 (1921-05-01), Knight
patent: 2702926 (1955-03-01), Rahaim
patent: 3490188 (1970-01-01), Troutner
patent: 4336678 (1982-06-01), Peters
patent: 4413459 (1983-11-01), Lambuth
patent: 4456497 (1984-06-01), Eberle
Chilcot Jr. Richard E.
Friedman Carl D.
Trus Joist Corporation
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