Lifting apparatus

Details Lifting apparatus Lifting apparatus

1992-03-06

1993-10-05

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

182 19, 182 63, 187 9R, B66F 1100

Patent

active

052496422

ABSTRACT:
A lifting apparatus has a movable chassis, a vertically movable platform disposed over the chassis and a vertically swingable, telescopic boom body connected between the chassis and the platform. The chassis, boom body and platform are arranged to form a Z-shape in side view. A detecting mechanism for monitoring the movement of the platform includes a winding drum, and a detection wire wound on the winding drum and having an end fixed to the platform. The boom body is extended at a rate correlated to the angle of inclination of the boom body so that the platform remains horizontal while moving vertically relative to the chassis.

REFERENCES:
patent: 3176792 (1965-04-01), Olson
patent: 3799290 (1974-03-01), Fisher
patent: 4456093 (1984-06-01), Finley et al.
patent: 4691805 (1987-09-01), Kishi

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