US PATENT SUBCLASS 172 / 423
.~ With actuator

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.~ With actuator {3}
424  DF  .~.~> Spring assisted
425  DF  .~.~> Gearing {3}
429  DF  .~.~> Manually operated lever rigid with crank axle

DEFINITION

Classification: 172/423

(under subclass 395) Apparatus in which vertical motion is imparted to the ground support by an actuator.

(1) Note. For the meaning of "actuator" see the class definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

418+, for actuators for imparting a translating motion to a ground support.

SEE OR SEARCH CLASS

280, Land Vehicles,

43.17+, for vehicles having actuating means to move the wheels vertically.