Locking means for relatively movable boom sections of boom of mo

Details Locking means for relatively movable boom sections of boom of mo Locking means for relatively movable boom sections of boom of mo

1974-12-20

1976-03-16

Spar, Robert J.

Traversing hoists

With haul-in line

212 55, 212 59R, B66C 2362

Patent

active

039440826

ABSTRACT:
A mobile crane has a multisection telescopic boom comprising a fly section and an adjacent boom section into which it telescopes. Releasable locking means are provided on the boom fly section and the adjacent boom section to prevent the extended boom sections from accidentally telescoping under the weight of a load in the event of a hydraulic system failure. The locking means take the form of a jam plate located near the base end of the extended boom fly section and engageable in interfering relationship with a selectively movable spring biased locking member of a locking assembly mounted near the forward end of the adjacent intermediate boom section.

REFERENCES:
patent: 1410190 (1922-03-01), Kaiser
patent: 1711282 (1929-04-01), Orr
patent: 3658189 (1972-04-01), Brown et al.
patent: 3831771 (1974-08-01), Wiencek

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