Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Patent
1992-10-22
1994-03-01
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
182226, 182186, B27B 2100
Patent
active
052898970
ABSTRACT:
A sawbuck includes a pivot beam which forms the pivot joint between the legs of at least three X-shaped sets of legs, and also forms a horizontal member of two or more Vierendeel trusses included in the sawbuck. In a preferred embodiment, the sawbuck includes a rigid pivot beam and three foldable X-shaped sets of legs, each set of legs including at least one pair of legs pivotally attached to each other between ends of the legs by the pivot beam. First and second ones of the three sets of legs are pivotally attached to the pivot beam adjacent to respective ends of the pivot beam, and a third one of the sets is pivotally attached to the pivot beam between the first and second sets. A first primary stabilizer beam is attached adjacent to a first end of a first one of the legs of each pair of legs so that the pivot beam, first legs and first primary stabilizer beam define a first Vierendeel truss. A second primary stabilizer beam is attached adjacent to the first end of a second one of the legs of each pair so that the pivot beam, second legs and second primary stabilizer beam define a second Vierendeel truss. A foldable tie bar, for releasably locking the X-shaped sets of legs and the sawbuck in an open position is attached between the first and second legs of at least one of the leg sets.
REFERENCES:
patent: 332749 (1885-12-01), Prall et al.
patent: 1191687 (1916-07-01), Gillett
patent: 1479209 (1924-01-01), Topp
patent: 1719253 (1929-07-01), White
patent: 1982061 (1934-11-01), Marlowe
patent: 2706829 (1955-04-01), Charnin
patent: 3001559 (1961-09-01), Szopo
patent: 3034546 (1962-05-01), Parsons
patent: 3047092 (1962-07-01), Janda
patent: 3148746 (1964-09-01), Juculano
patent: 4386677 (1983-06-01), Gulezian
patent: 4454929 (1984-06-01), Wellman
patent: 4561336 (1985-12-01), Davis
patent: 4609070 (1986-09-01), Props et al.
M. Salvadori et al., "Structure in Architecture, The Building of Buildings", pp. 190-193, Prentice-Hall, Inc. 1986.
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