Telescopic boom for a crane

Details Telescopic boom for a crane Telescopic boom for a crane

1974-12-16

1976-10-12

Spar, Robert J.

Traversing hoists

With haul-in line

212 55, 52111, 52118, B66C 2362

Patent

active

039852342

ABSTRACT:
A telescopic boom of a crane comprising a base element adapted for support on a turret of the crane, and a plurality of telescopic elements slidably engaged within one another and within the base element. The elements have a polygonal cross-section, each element having a lower or inner compression leg of inverted V-shape which opens downwardly and falls the load. First guide shoes are mounted on each telescopic element on the upper or outer leg thereof, bearing against the surrounding element, and second guide shoes are mounted on each branch of the inverted V-shaped inner leg also bearing against the surrounding element.

REFERENCES:
patent: 1345304 (1920-06-01), Zied
patent: 2508835 (1950-05-01), Moon et al.
patent: 2920725 (1960-01-01), Emmons
patent: 3620579 (1971-11-01), Brown et al.
patent: 3708937 (1973-01-01), Sterner
patent: 3807108 (1974-04-01), Johnston
patent: 3830376 (1974-08-01), Fritsch

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