Portable riser

Details Portable riser Portable riser

1979-11-30

1981-12-22

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Safety device, platform associated

Railing

182132, 182152, 52 9, E04H 312

Patent

active

RE0308307

ABSTRACT:
A portable riser having a plurality of steps which have a travel position in superimposed relation with structure for rolling the riser along the floor, hinge means interconnecting the steps whereby they may be folded out of superimposed relation, a pair of sliders pivotally associated with each step and which are hinged to sliders of an adjacent step by said hinge means whereby lifting of one step causes erection of the riser to an erected position, and latch means automatically operable to prevent movement of the steps beyond erected position and to lock the riser in erected position for use.

REFERENCES:
patent: 1125194 (1915-01-01), Sigmund
patent: 1284078 (1918-11-01), Evans
patent: 1818428 (1931-08-01), Paysen
patent: 2575593 (1951-11-01), Peery
patent: 2598983 (1952-06-01), Ellis
patent: 2859488 (1958-11-01), Mackintosh
patent: 3229430 (1966-01-01), Berg
patent: 3747706 (1973-07-01), Paine
patent: 3747708 (1973-07-01), Wenger

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