Hoist

Details Hoist Hoist

1982-04-07

1984-06-19

Levy, Stuart S.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

188134, 254378, 254386, B60T 712, B66D 148, B66D 500

Patent

active

044550138

ABSTRACT:
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 displaceable sheave set which carries a threaded nut. The axial movement of the nut is restrained by a sleeve which permits rotation of the nut with axial movement of the rod. If the axial movement 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.

REFERENCES:
patent: 2772085 (1956-11-01), Dodge
patent: 3286989 (1966-11-01), Bangerter et al.
patent: 3368796 (1968-02-01), Ulbing
patent: 3537686 (1970-11-01), McKendrick
patent: 3669411 (1972-06-01), McKendrick
patent: 4194598 (1980-03-01), Suozzo
patent: 4346793 (1982-08-01), Fuse et al.

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