US PATENT SUBCLASS 172 / 420
.~.~.~ Rack and pinion or ratchet 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}
415  DF  .~ Translating motion {3}
418  DF  .~.~ With actuator {2}
420.~.~.~ Rack and pinion or ratchet type

DEFINITION

Classification: 172/420

(under subclass 418) Apparatus in which the actuator comprises a rack member meshing with a gear or engageable by a ratchet member.

SEE OR SEARCH CLASS

280, Land Vehicles,

43.21, for vehicles having supporting wheels which are moved vertically relative to the vehicle frame by a rack and pinion or ratchet actuating means.