Static structures (e.g. – buildings) – Opaque stonelike module – Lateral retaining feature on facing sheet
Patent
1988-03-23
1989-02-28
Murtagh, John E.
Static structures (e.g., buildings)
Opaque stonelike module
Lateral retaining feature on facing sheet
52573, E04F 1504
Patent
active
048074160
ABSTRACT:
A tongue and groove plywood panel in which the tongue comprises a protrud lip having a triangular cross-section extending along the length of a first essentially convex edge. The essentially convex edge is formed by sloping surfaces that slope away from the junctions of the tongue and the first edge to the upper and lower veneers of the panel. The groove comprises a triangular cavity formed in a second essentially concave edge opposite the first essentially convex edge. The second essentially concave edge is formed with inwardly sloping surfaces that slope inwardly from the upper and lower veneers of the panel to the groove to form a shallow essentially concave channel along the second edge to guide and direct the tongue into the groove. When the panel is joined to a similar panel, the tongue of one panel engages the groove of the other and the veneers of the joined panels are spaced slightly at the joint due to the sloping surfaces of the first essentially convex edge sloping away from the adjacent sloping surfaces of the second edge of the joined panel. Such an arrangement allows for swelling of the tongue and groove joint of the present invention due to moisture without the buildup of internal stresses which would tend to cause buckling at the joint.
REFERENCES:
patent: 444042 (1891-01-01), Brock
patent: 1460084 (1923-06-01), Wallis
patent: 2823433 (1958-02-01), Kendall
patent: 2839790 (1958-06-01), Collings
patent: 3579941 (1971-05-01), Tibbals
Council of Forest Industries of British Columbia Plywood Technic
Murtagh John E.
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