Lifting apparatus

Details Lifting apparatus Lifting apparatus

1991-10-24

1993-05-18

Johnson, Blair M.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

182 63, B66F 1104

Patent

active

052112594

ABSTRACT:
A lifting apparatus has a movable chassis, a vertically movable platform disposed over the chassis and a telescopic boom body connected between the chassis and the boom body and arranged to form a Z-shape in side view. An angle detector gives a signal indicative of the angle of inclination of the boom body relative to the chassis. The boom body is extended at a rate correlated to the angle of inclination of the boom body so that the upper end of the boom body moves vertically relative to the chassis.

REFERENCES:
patent: 4691805 (1987-09-01), Kishi
patent: 4694930 (1987-09-01), Kishi
patent: 5082085 (1992-01-01), Ream et al.

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