US PATENT SUBCLASS 212 / 115
.~.~.~ Ratchet sheave
Current as of: June, 1999
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DEFINITION
Classification: 212/115
Ratchet sheave:
(under subclass 97) Cable hoists including a carriage, a hoisting rope passing over a sheave or drum thereon, and a ratchet mechanism interposed between the drum or sheave and the carriage, and wholly supporting the load from the carriage during traversing movement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99, for similar devices comprising an endless operating cable passing over a drum on the trolley, a hoisting rope connected with the drum, and a clutch mechanism interposed between the operating cable and the hoisting cable.
114, for similar devices comprising a pivoted member which presses the hoisting rope against a sheave and thereby prevents motion in one direction.
