Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Patent
1997-03-21
2000-02-08
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
182225, B27B 2100
Patent
active
060218665
ABSTRACT:
Disclosed herein is a trestle-type, dual-frame sawhorse including first and second generally rectangular, identical frame members, hinged together along their horizontal top beams, each having depending legs with horizontal leg braces parallel to the top beams. Each leg has a longitudinal slot with a transverse pin which passes through a bound space defined within a rigid, rectangular-framed strut. Each strut has a pair of longer side members and a pair of shorter side members, and is bound by the pins into the slots of both legs of a leg pair. The strut can be moved to a vertical position whereby the legs of the sawhorse are held together, or the strut can be allowed to drop into a horizontal position where it keeps the legs from splaying farther when the sawhorse is under load. Detent notches in the inner surfaces of the strut permit the sawhorse to resist being collapsed back into its folded orientation. An alternative embodiment of the sawhorse includes an additional, generally vertically-oriented structural member integral to each frame member of the sawhorse, having an upper end fixed to the underside of the horizontal top beam and a lower end fixed to the horizontal leg brace. Each vertically-oriented structural member includes a slot with a transverse pin. Thus, a pair may have a single strut bound between them to permit the frames with which they are associated to be fixed securely in either an open or closed orientation.
REFERENCES:
patent: 145174 (1873-12-01), Harden
patent: 249095 (1881-11-01), Reyburn
patent: 437936 (1890-10-01), O'Brien
patent: 2230019 (1941-01-01), Rich
patent: 4429765 (1984-02-01), Garcia
patent: 4756385 (1988-07-01), Deitz
patent: 5351785 (1994-10-01), DuRapau
Chin-Shue Alvin
Gerber Joseph E.
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