Telescopic booms

Details Telescopic booms Telescopic booms

1982-09-22

1986-05-13

Valenza, Joseph E.

Material or article handling

Vertically swinging load support

Shovel or fork type

414718, 212149, 212153, 901 49, B66C 1500

Patent

active

045883475

ABSTRACT:
A telescopic boom for a crane, access platform or the like comprises at least three telescopic boom sections the intermediate section being arranged to be extended by a hydraulic ram while the outer section being arranged to be extended by a pulley and chain arrangement. A telescoping boom safety system includes a wire rope and a pair of linked drag chains which extend from a first anchorage on the outer section around a guide to a second anchorage on the base section. Failure of the pulley and chain arrangement causes the safety system to prevent or contain relative movement of the outer and intermediate sections and thereby stop sudden and catastrophic retraction of the outer section.

REFERENCES:
patent: 3055459 (1962-09-01), Eitel
patent: 3265360 (1966-08-01), Tax
patent: 3282449 (1966-11-01), Buford
patent: 3502228 (1970-03-01), Tamborino

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