Crane jib

Details Crane jib Crane jib

1999-06-29

2000-08-15

Brahan, Thomas J.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

212279, B66C 2376

Patent

active

061022209

ABSTRACT:
A crane jib includes a main boom arranged on a support base for rotation about a vertical pivot axis, and an auxiliary boom extending the main boom at one end and movable with respect to the main boom by means of a first adjustment element. In order to realize a high degree of energy-efficiency and a stable jib at great reach of the jib, a pair of counterweights is provided which are supported at the other one of the ends of the main boom at an angle relative to one another and respectively positioned on both sides of a plane which extends vertically through the longitudinal main boom axis. The counterweights so interconnected to one another as to be swingable in synchronism by a second adjustment. A control device connects the first and second adjustment elements for balancing the variation in reach of the auxiliary boom through a change in reach of the counterweights.

REFERENCES:
patent: 3236391 (1966-02-01), Kennedy
patent: 3247987 (1966-04-01), Lake
patent: 3340907 (1967-09-01), Bily
patent: 3743049 (1973-07-01), Levrini
patent: 4867321 (1989-09-01), Montgon

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