Auto-leveled crane boom man baskets

Details Auto-leveled crane boom man baskets Auto-leveled crane boom man baskets

1984-04-06

1985-11-19

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

182 19, 340685, B66F 1104, G08B 2100

Patent

active

045536325

ABSTRACT:
An automatic leveling device for crane boom supported work baskets includes a weighted and damped plumb sensor coupled to a first potentiometer and a second potentiometer for measuring the relative angle between the crane boom and the basket pivotally attached thereto. The measured output levels of the two potentiometers are applied to a servo circuit that controls a linear power actuator pivotally attached between the boom and basket to thereby maintain the basket vertical. The basket may be electrically isolated from ground for use on "live" wire maintenance when the basket carries a storage battery for powering the servo and actuator and if the basket controls for boom movement are transmitted to the crane through a fiber optic or radio remote control link.

REFERENCES:
patent: 2772411 (1956-11-01), Cooper
patent: 3590948 (1971-07-01), Milner
patent: 3791484 (1974-02-01), Harrison
patent: 3860088 (1975-01-01), Gellatly
patent: 4116304 (1978-09-01), Durnell

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