Multi-section telescopic boom

Details Multi-section telescopic boom Multi-section telescopic boom

1977-11-10

1979-05-29

Faw, Jr., Price C.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Fluid pressure actuated

52118, 212 55, E04H 1234

Patent

active

041563310

ABSTRACT:
A multi-section telescopic jib or boom comprising a base section and three movable sections mounted to extend or retract relative to each other on operation of drive means within the sections, including a first ram connected between the base section and the innermost sections, a second ram connected between the innermost and central sections and a chain having ends connected between the innermost section or the first ram and engaging a chain wheel mounted on the central section or second ram, means being provided to releasably connect the chain to the outermost section to extend the boom.

REFERENCES:
patent: 3749254 (1973-07-01), Grider
patent: 3817007 (1974-06-01), Hall
patent: 3842985 (1974-10-01), Suede
patent: 4057942 (1977-11-01), Kromefeld et al.

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