Telescopic boom elevating apparatus with a mechanical lift and l

Details Telescopic boom elevating apparatus with a mechanical lift and l Telescopic boom elevating apparatus with a mechanical lift and l

1991-06-27

1992-08-04

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

182 63, 182141, 187 9R, B66F 1104, B66B 920

Patent

active

051350742

ABSTRACT:
A telescopic boom and lift apparatus positions a vertical support and platform and includes a telescopic boom unit and a rigid mechanical lift linkage to pivot the boom unit with automatic leveling of the support. The telescopic boom unit is pivoted to a base, with a motor unit coupled to extend and retract the boom unit. A rigid linkage unit is pivotally interconnected to the base and the tip boom of the boom unit. The linkage unit is constructed and arranged to support the boom unit in the retracted, collapsed position and to exert a lifting and pivot force on the boom unit in response to extension of the tip boom. Parallelogram linkages on the boom unit and lift unit are coupled to a pivot unit at the tip boom and maintains a precise orientation of the vertical support and platform. The lift arm unit includes parallel rigid arms which are laterally spaced such that the boom unit collapses into the lift unit to form a compact assembly. The wide spacing of the pivot support for the boom unit and lift unit creates a stable support permitting angular positioning of the platform on the vertical support.

REFERENCES:
patent: 3893540 (1975-07-01), Beucher
patent: 4162873 (1979-07-01), Smith
patent: 4326601 (1982-04-01), Grove
patent: 4694930 (1987-09-01), Kishi
patent: 4741413 (1988-05-01), Kishi
patent: 4754840 (1988-07-01), MacDonald
patent: 4775029 (1988-10-01), MacDonald
patent: 4953666 (1990-09-01), Riding

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