Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Bruce E. Ratcliff0
Date of Patent
February 13, 2007
0Patent Application Number
106357920
Date Filed
August 6, 2003
0Patent Primary Examiner
Patent 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.
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