Derrick crane

Details Derrick crane Derrick crane

B - Operations, Transporting

60

P

212/29

B60P 3/28 (2006.01) B66C 23/60 (2006.01) B66C 23/84 (2006.01)

Patent

CA 1212081

A B S T R A C T 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 means 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.

413425

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