Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Patent
1987-03-04
1988-07-12
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
182182, 182222, 182227, B27B 2100
Patent
active
047563869
ABSTRACT:
A support structure is disclosed for a scaffolding system. The support structure is collapsible and adjustable in height. The support structure includes a first rigid cross bar having a first and second pair of support legs disposed at both ends of the cross bar. The support legs of the pairs are hingedly connected to the first cross bar. First and second intermediate supports are connected to opposite ends of the first cross bar and extend downwardly therefrom between opposing support legs. Releasable brace means are provided for rigidly tying free ends of the intermediate supports to opposing legs of the support structure. A second rigid cross bar is provided as being sized to extend between the first and second intermediate support structures. A lock pin releasably secures first and second ends of the second cross bar to the first and second intermediate supports at spaced intervals along the lengths of the intermediate supports.
REFERENCES:
patent: 835059 (1906-11-01), Curley
patent: 1064334 (1913-06-01), Johnson
patent: 1819252 (1931-08-01), Linsner
patent: 2257876 (1941-10-01), Berchem
patent: 2376787 (1944-05-01), Larson
patent: 3934676 (1976-01-01), Rice
patent: 4238001 (1980-12-01), Alexander
patent: 4375245 (1983-03-01), Schill
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