Safeload indicator for aerial lift platform apparatus

Details Safeload indicator for aerial lift platform apparatus Safeload indicator for aerial lift platform apparatus

1980-05-30

1982-11-16

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

212157, 116298, 182 18, B66F 1104, G01D 1312

Patent

active

043591370

ABSTRACT:
A workman's lift platform apparatus has a vertically swingable and extensible boom with a workman's platform at the outer end. A color coding indicating the amount of boom extension is provided on the fly section of the boom, visible to the workman in the platform, and an indicator plate having corresponding color coding is provided adjacent the controls on the platform. The indicator plate in the form of a drum is driven proportionately to the angular movement of the boom by a pair of sheathed, push-pull cables, or by a sheathed torsion cable. In other embodiments, the indicator plate is tilted in proportion to the angular movement of the boom by a sheathed push-pull cable or by a parallel bar linkage. A cursor is provided adjacent the indicator plate, and is part of a gravity-operated pendulum.

REFERENCES:
patent: 1773589 (1930-08-01), Lichtenberg
patent: 2374298 (1945-04-01), Nasset
patent: 2569890 (1951-10-01), Hicks
patent: 3011261 (1961-12-01), Riley
patent: 3122125 (1964-02-01), Towne
patent: 3223249 (1965-12-01), Cady
patent: 3490015 (1970-01-01), Nixon
patent: 3922789 (1975-12-01), Sarrell
patent: 3961685 (1976-06-01), Kozai
patent: 4052602 (1977-10-01), Horn
patent: 4211332 (1980-07-01), Pitman

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