Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Patent
1978-09-12
1980-10-21
Perham, Alfred C.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Side-by-side terminus shafts; e.g., truss
52634, 52693, 52731, E04C 308, E04C 316
Patent
active
042286310
ABSTRACT:
A wooden structural member or joist having a continuous tension chord and a continuous compression chord which are spaced apart and parallel. The tension chord and compression chord form the effective top and bottom of the joist, the actual orientation depending on the type of load imposed upon the joist. Dentations or dentated panels connect the side edges of the tension chord to the side edges of the compression chord, thus forming the two sides of the joist which has a hollow rectangular cross sectional shape. The dentations are planar with two parallel edges and two non-parallel edges tapering together forming a broad end and a narrow end. The face of the broad end is glued to the side edge of the compression chord, and the face of the narrow end is glued to the side edge of the tension chord. The sides of the joist are discontinuous because of the dentated shape. The dentations are coordinately spaced to allow pipes, conduits, ducts and other equipment to pass transversely through the joist. The hollow rectangular shape also allows such equipment to pass longitudinally along the joist between the ends.
REFERENCES:
patent: 1644940 (1927-10-01), Moyer
patent: 2941635 (1960-06-01), Harris
patent: 3263387 (1966-08-01), Simpson
patent: 3345792 (1967-10-01), Chandler
patent: 3651612 (1972-03-01), Schmitt
patent: 3702050 (1972-11-01), Price
patent: 3861109 (1975-01-01), Hunt et al.
patent: 4001999 (1977-01-01), Chandler
patent: 4074498 (1978-02-01), Keller et al.
Garrison David L.
Perham Alfred C.
Smith Ford E.
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