Tower crane with overbooming protection

Details Tower crane with overbooming protection Tower crane with overbooming protection

1983-07-11

1985-06-25

Blix, Trygve M.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

212222, 212151, 212239, B66C 2372

Patent

active

045248745

ABSTRACT:
A tower crane with a counterweighted luffing boom has its counterweight lines and pulleys so arranged that, in normal operating positions of the boom, the counterweights and lines tend to swing the boom upwardly, but when the boom angle is steep, beyond about 70.degree. from the horizontal, the counterweights and lines then pull on the boom in the opposite direction, tending to retard further upward travel. The boom and supporting structure are thereby protected against overbooming by wind forces when the boom is inclined at a very steep angle facing into the wind.

REFERENCES:
patent: 849078 (1907-04-01), Moss
patent: 2364493 (1944-12-01), Vlinski
patent: 2408500 (1946-10-01), West
patent: 3304634 (1967-02-01), Becker
patent: 3530999 (1970-09-01), Naruns
patent: 3998336 (1976-12-01), Tax et al.

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