Derrick crane

Details Derrick crane Derrick crane

1982-09-28

1985-06-25

Barefoot, Galen L.

Traversing hoists

Having horizontally swinging boom or bridge

And vertically swinging

212247, 212253, B66C 2316

Patent

active

045248753

ABSTRACT:
A derrick crane has a jib pivoted by way of a horizontal pivot to the movable member of a bearing device supported by a vertically extending mast and includes devices for raising and lowering a load, luffing the jib and slewing the jib about the mast. The bearing device comprises a single ring of free running balls which are a running fit in part circular registering grooves formed in inner and outer bearing rings. The bearing device is located on the mast in such a position that the line of thrust of the jib passes within the pitch circle diameter of the ring of balls.

REFERENCES:
patent: 1018529 (1912-02-01), Swensson
patent: 2079663 (1937-05-01), Rasmussen
patent: 3391810 (1968-07-01), Tourneau
patent: 3811577 (1974-05-01), Yancey
patent: 3957161 (1976-05-01), Tax
patent: 3977531 (1976-08-01), Brewer
patent: 3985406 (1976-10-01), Baron
patent: 4061230 (1977-12-01), Goss et al.
patent: 4184600 (1980-01-01), Goss et al.
patent: 4216870 (1980-08-01), Bonneson et al.

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