Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Patent
1997-05-13
1998-09-29
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
1821862, 1821863, E04G 134
Patent
active
058134956
ABSTRACT:
A collapsible sawhorse includes an elongated board with a pair of support legs at each end. Each leg is connected to the bottom of the board by a transverse hinge and a longitudinal hinge. The hinges enable the legs to be first folded inwardly, and then upwardly against the bottom of the board.
REFERENCES:
patent: 1960991 (1934-05-01), De Young
patent: 2412716 (1946-12-01), Campbell
patent: 2673765 (1954-03-01), Storck
patent: 2706661 (1955-04-01), Clayton
patent: 3162266 (1964-12-01), Franzen
patent: 3282379 (1966-11-01), Jones
Chin-Shue Alvin C.
Lo Jack
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