Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1977-04-13
1978-08-15
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182100, 182220, 182228, 52182, E04F 1112
Patent
active
041065913
ABSTRACT:
A stairway capable of being shipped in a knock-down condition and erected with a minimum of labor and without special tools is disclosed. The stairway comprises a square tubular elongated support member having mounting brackets at each end enabling it to be mounted in inclined relation between different levels of a structure. A plurality of step assemblies are clamped in spaced relation onto the support member. Each step assembly includes a tread support having a horizontal load bearing portion and an angulated integral strut portion both fastened to a mounting flange which engages the topside of the support member. A locking sleeve surrounds the bottom and side walls of the support member and has outturned flanges which are fastened to the mounting plate by bolts. In one embodiment, the bottom of the locking sleeve has a slight upward convexity which flexes elastically when the bolts are tightened to maintain clamping pressure against the support member. In another embodiment the bottom of the locking sleeve engages flush against the bottom of the support member and the locking sleeve flanges are spaced from the mounting flange and flexed to provide the clamping action.
REFERENCES:
patent: 2759695 (1956-08-01), Berner
patent: 2936863 (1960-05-01), Holzer
patent: 3310132 (1967-03-01), Rolland
patent: 3467220 (1969-09-01), Smith
patent: 3834098 (1974-09-01), Wutzke
patent: 3888354 (1975-06-01), Margolin
Cohen Allen
Cohen Howard
Cohen Ronald
M. Cohen & Sons, Inc.
Machado Reinaldo P.
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