US PATENT SUBCLASS 187 / 271
.~.~ Worm-type gear

Current as of: June, 1999
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187 /   HD   ELEVATOR, INDUSTRIAL LIFT TRUCK, OR STATIONARY LIFT FOR VEHICLE

250  DF  HAVING SPECIFIC LOAD SUPPORT DRIVE-MEANS OR ITS CONTROL {6}
270  DF  .~ Includes gear on support mating with stationary rack or chain {1}
271.~.~ Worm-type gear

DEFINITION

Classification: 187/271

Worm-type gear:

(under subclass 270) Drive-means* wherein the rotatable gear either (a) has a cylindrical shape and a continuous tooth on its outer surface which is threaded around the longitudinal axis of the cylinder or (b) has teeth on its outer surface shaped to cooperate with a cylinder shaped bar mounted along the length of the shaft* and having a continuous tooth on its outer surface which is threaded around the longitudinal axis of the cylinder shaped bar.