Platform raising system in scaffolding

Details Platform raising system in scaffolding Platform raising system in scaffolding

1993-04-16

1994-11-29

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Platform with elevating or lowering means

Suspended

182132, E04G 120

Patent

active

053681258

ABSTRACT:
The scaffolding includes a tower provided with equally spaced rungs and adapted to be secured to an adjacent building structure, an outer sleeve surrounding the tower and guided therealong and a work platform supported by the outer sleeve. The raising system includes an inner sleeve surrounding and guided on the tower inwardly of the outer sleeve, a pair of latching levers pivoted to the outer sleeve and latching onto the tower, a pair of hydraulic rams pivoted to the outer sleeve and to the inner sleeve and reciprocating the latter for up and down movement relative to the outer sleeve, and a pair of hooks pivoted on the inner sleeve to engage and disengage opposite rungs of the tower. To raise the outer sleeve and work platform, the rams are retracted while the inner sleeve is hooked to the tower. When the ram retracting stroke is completed, the latching levers latch the outer sleeve to the tower and the rams extend to raise the inner sleeve which is then hooked to a higher pair of opposite tower rungs.

REFERENCES:
patent: 279740 (1883-06-01), Gillett
patent: 3179178 (1965-07-01), Nietz
patent: 3318414 (1967-05-01), Meek
patent: 3323616 (1967-06-01), Best
patent: 3466723 (1969-09-01), Durand
patent: 3908801 (1975-09-01), Pohlman
patent: 4293054 (1981-10-01), Pieri
patent: 4294332 (1981-10-01), Ready
patent: 4418791 (1983-12-01), Frey-Wigger
patent: 4809814 (1989-03-01), St-Germain
patent: 5067587 (1991-11-01), Mims, Jr. et al.

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