Extension and retraction system for four section telescopic boom

Details Extension and retraction system for four section telescopic boom Extension and retraction system for four section telescopic boom

1990-02-01

1991-10-29

Chilcot, Jr., Richard E.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Tilts relative to base

52121, 182141, 212269, E04H 1234

Patent

active

050604279

ABSTRACT:
An extension and retraction system for a four section telescopic boom having simultaneous and equal extension and retraction of the telescopic sections, wherein a pair of hydraulic cylinders are mounted exteriorly of the boom for extending and retracting the inner mid section relative to the base section; a pair of extension chains or cables are connected between the base section and the outer mid section, and between the fly section and the inner mid section; and a pair of retraction cables are connected between the base section and the outer mid section, and between the fly section and the inner mid section. The extension and retraction chains and cables are positioned within the boom sections to thereby be protected from damage.

REFERENCES:
patent: 2632530 (1953-03-01), Wagner
patent: 3721054 (1973-03-01), Hornagold
patent: 3845596 (1974-11-01), Veenstra
patent: 4004695 (1977-01-01), Hockensmith et al.
patent: 4217987 (1980-07-01), Gatto et al.
patent: 4327533 (1982-05-01), Sterner
patent: 4506480 (1985-03-01), Murrill et al.
patent: 4514939 (1985-05-01), Rathe et al.
patent: 4575976 (1986-03-01), McDermott et al.
patent: 4635805 (1987-01-01), Mentzer
patent: 4690290 (1987-09-01), Gustafsson
patent: 4789120 (1988-12-01), Spidel

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