Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Patent
1978-04-03
1980-06-17
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
52 98, 52694, E04C 3292
Patent
active
042077192
ABSTRACT:
A beam formed of an assembly of a pair of vertically spaced apart wood chord members interconnected by a number of angularly arranged, channel shaped struts located along the vertical faces of the chords and on opposite sides of the chords. The channel base of each strut is V-shaped in cross-section, with an apex angle that increases from top to bottom of the strut so that the base gradually flattens along the strut length in the upwards direction. The channel legs of each strut gradually increase in depth from bottom to top along the strut length, to thereby shift the location of the channel's neutral axis away from the base towards the free edges of the legs at the upper end of the strut. The upper and lower ends of the struts are extended to form enlarged, flat, connector plate portions having struck-out teeth for embedding into the adjacent vertical face portions of the chord members. The struts may be formed in integral groups of four arranged in two V-shapes integrally joined together at their adjacent connector plate portions. The upper chord may be wider than the lower chord so that while the connector plate portions are vertical, the struts are angled downwardly and inwardly relative to the lower chord to present an approximate wedge-like shape cross-section for the beam.
REFERENCES:
patent: 2201047 (1940-05-01), Moore et al.
patent: 3025577 (1962-03-01), Jureit
patent: 3416283 (1968-12-01), Sanford
patent: 3651612 (1972-03-01), Schmitt
patent: 3748809 (1973-07-01), Jackson
patent: 4078352 (1978-03-01), Knowles
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