US PATENT SUBCLASS 172 / 412
.~.~.~ Swingable arm engageable with wheel

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

395  DF  WITH GROUND SUPPORT VERTICALLY ADJUSTABLE RELATIVE TO FRAME {10}
407  DF  .~ Power operated adjustment {2}
408  DF  .~.~ Wheel actuates its crank axle mount {3}
412.~.~.~ Swingable arm engageable with wheel

DEFINITION

Classification: 172/412

(under subclass 408) Apparatus in which the means intermittently connectible with the wheel is a means pivoted on the frame movable into engagement with the actuating wheel or into engagement with a means mounted to turn therewith on the same axis so that rolling movement of the wheel acts on the means pivoted to the frame to move the wheel relative to the frame.