Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Patent
1993-06-22
1994-04-26
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
182226, 182151, 182181, B27B 2100
Patent
active
053058500
ABSTRACT:
The invention is a sawhorse that is quickly assembled and disassembled and is strong enough to support a heavy load. The sawhorse includes an elongated, horizontally disposed, rectilinear support member held above the ground by two spaced pairs of oppositely inclining leg members that overlap at a top end. Each leg member has a rectangular notch at the top end that is acutely angled to form a channel that receives the support member. A lower portion of the support member has two space rectangular channels for receiving the top ends of each pair of leg members. The leg members are pivotally coupled together with a pivot screw so that each leg member can be quickly rotated into a receiving position where the notches are aligned and able to receive the support member. Each leg member has the same dimensions and has a notch that is the same size and located at the same relative location making the sawhorse quick and inexpensive to fabricate.
REFERENCES:
patent: D152821 (1949-02-01), O'Neil
patent: D245105 (1977-07-01), Rader
patent: 1749190 (1930-03-01), McGregor
patent: 1982061 (1934-11-01), Marlowe
patent: 2261217 (1941-11-01), Bond
patent: 2911265 (1959-11-01), Hannah
patent: 3035660 (1962-05-01), Leon
patent: 4071113 (1978-11-01), Pelser
patent: 4574917 (1986-03-01), Stoddard
patent: 4638885 (1987-01-01), Frederick
patent: 4883246 (1989-11-01), Esposito
patent: 4890693 (1990-01-01), O'Brien
patent: 5052308 (1991-10-01), Brown
Six photographs of a metal clamp sawhorse as referred to in the specification on pp. 2-3.
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