Screw driven hoist

Details Screw driven hoist Screw driven hoist

2007-02-13

2007-02-13

Marcelo, Emmanuel M (Department: 3654)

Implements or apparatus for applying pushing or pulling force

Portable implements or apparatus for tensioning flexible...

Including screw drive

C212S174000

Reexamination Certificate

active

10635792

ABSTRACT:
A hoist provides high mechanical advantage and accurate positioning, driven by hand or with a powered rotary implement such as a drill. The hoist includes flexible tension members, such as chains, cables or straps, for applying force and tension to a load. A load nut is connected to the tension members for high mechanical advantage from rotational drive input to a load screw threadedly connected to the load nut. Alongside the tension members are guides forming channel-like spaces within which the flexible tension members travel. The guides, or portions of the guides, pass through the load nut in most forms of the invention.

REFERENCES:
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patent: 5623751 (1997-04-01), Knutson
patent: 5971178 (1999-10-01), Ratcliff et al.

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