Highly maneuverable insulated man lifting aerial crane for use i

Details Highly maneuverable insulated man lifting aerial crane for use i Highly maneuverable insulated man lifting aerial crane for use i

1986-01-07

1987-07-14

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

52118, B66F 1104

Patent

active

046796533

ABSTRACT:
A powerful, highly maneuverable, man-lifting crane has three vertically articulating sections which swivel on a common turret for horizontal positioning, the third or outer section of the group comprising three telescoping, tubular booms wherein the outermost boom is constructed of a dielectric material such as fiberglass for carrying an electrically insulated man-lifting bucket at its outer end. A pair of hydraulic extension and retraction cylinders for the telescoping booms of the third section are both housed internally of the section and are mechanically interconnected and hydraulically coupled in such a way that, upon extension of the third section, the fiberglass boom always extends first and, upon retraction of the third section, the fiberglass boom always retracts last. One of the booms of the third section utilizes an unusually long rod in connection with its hydraulic cylinder unit, which rod is supported against bending and twisting by a unique, sliding support coupled in a lost motion connection with the fiberglass boom. A radio transmitter carried in the lifting bucket enables the workman to control all operating functions of the crane from the bucket itself without creating an electrically conductive path to ground potential through control wires and cables.

REFERENCES:
patent: 3212604 (1965-10-01), Garnett
patent: 3604533 (1971-09-01), Eckels
patent: 3774217 (1973-11-01), Bonner
patent: 3891056 (1975-06-01), Ashworth

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