US PATENT SUBCLASS 172 / 427
.~.~.~ Screw jack type

Current as of: June, 1999
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172 /   HD   EARTH WORKING

395  DF  WITH GROUND SUPPORT VERTICALLY ADJUSTABLE RELATIVE TO FRAME {10}
423  DF  .~ With actuator {3}
425  DF  .~.~ Gearing {3}
427.~.~.~ Screw jack type

DEFINITION

Classification: 172/427

(under subclass 425) Apparatus in which the gearing includes a pair of relatively movable threaded members.

SEE OR SEARCH THIS CLASS, SUBCLASS:

419, for a screw-jack type actuator for a vertically adjustable ground support having translating motion.

504, for a screw-type actuator for lifting a tool for transport on a wheeled frame.

SEE OR SEARCH CLASS

280, Land Vehicles, 43.2, for vehicles having supporting wheels which are moved vertically relative to the vehicle frame by a screw-jack type actuating means.