Hoist

Details Hoist Hoist

B - Operations, Transporting

66

D

254/52

B66D 1/00 (2006.01) B66D 3/04 (2006.01) B66D 3/18 (2006.01)

Patent

CA 1174228

HOIST ABSTRACT OF THE DISCLOSURE A hoist comprises a housing carrying a fixed and slidable sheave set which are engaged by a rope. A piston and cylinder combination are connected to the slidable sheave set for moving it and thus moving a load connected to the rope. The piston has a threaded rod connected to the displace- able sheave set which carries a threaded nut. The axial move- ment of the nut is restrained by a sleeve which permits rotation of the nut with axial movement of the rod. If the axial move- ment of the rod accelerates above a selected limit, for example when the load is abruptly removed from the rope, the nut moves against a friction surface in the sleeve to brake the rotation thereof and thus brake the axial movement of the rod.

400997

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