Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Side-by-side terminus shafts; e.g. – truss
Patent
1985-12-10
1987-01-20
Friedman, Carl D.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Side-by-side terminus shafts; e.g., truss
52729, 411471, 411457, E04C 302
Patent
active
046371940
ABSTRACT:
An I-beam or joist is formed of a pair of horizontal, parallel wood chords connected together by a wood web. The lower chord is pre-stressed by holding it in compression during assembly of the chords and web. The chords are fastened to the web by U-shaped wire staples whose legs have bevels formed on their free ends which cause the legs to move towards each other and to cross the central axis of their respective staple as they longitudinally penetrate thewood during insertion through a chord and into the wood web. Further, plates are fastened upon the opposite faces of the web at the opposite ends of the web, thereby increasing the web thickness at the opposite ends of the beam to substantially increase the allowable shear stress limits of the beam.
REFERENCES:
patent: 327339 (1885-09-01), Squire
patent: 630049 (1899-08-01), Griffith
patent: 4442649 (1984-04-01), Birckhead et al.
patent: 4500378 (1985-02-01), Reppel et al.
patent: 4501102 (1985-02-01), Knowles
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