Boom arm support lock

Details Boom arm support lock Boom arm support lock

1976-08-30

1977-08-02

Oresky, Lawrence J.

Traversing hoists

Overhead

Cable

92 23, 212 8R, 214776, B66C 2300

Patent

active

040390934

ABSTRACT:
A boom arm safety lock including a pivotally-mounted boom arm and a fluid cylinder assembly for pivoting the arm up and down. A lock bar is pivotally mounted adjacent the boom arm for upwardly supporting the boom arm in the event the fluid in the cylinder assembly is exhausted, and the boom arm will therefore remain in the raised position.

REFERENCES:
patent: 1558636 (1925-10-01), Rutan
patent: 2969885 (1961-01-01), Lutz
patent: 3091346 (1963-05-01), Yawn
patent: 3152789 (1964-10-01), Bartholomew
patent: 3360146 (1967-12-01), Borer et al.
patent: 3918601 (1975-11-01), Zimmerman
patent: 3982648 (1976-09-01), Luedtke et al.

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