US PATENT SUBCLASS 172 / 487
.~.~ Constant height depth adjustment

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

452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
485  DF  .~ Power actuator with manual adjusting or supplemental manual actuating means {2}
487.~.~ Constant height depth adjustment

DEFINITION

Classification: 172/487

(under subclass 485) Apparatus in which the earth working element may be lowered to different depths in the soil as the result of different settings of the attendant manipulable means but is always raised to substantially the same height over the ground.

SEE OR SEARCH THIS CLASS, SUBCLASS:

411, for self-powered crank axle mounted vertically adjustable wheels with constant height depth adjustment.