US PATENT SUBCLASS 172 / 409
.~.~.~ Wheel lockable to crank axle arm

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}
409.~.~.~ Wheel lockable to crank axle arm

DEFINITION

Classification: 172/409

(under subclass 408) Apparatus in which the means intermittently connectible to the wheel locks said wheel against rotation relative to the pivotally mounted crank arm so that rolling movement of the wheel over the ground causes movement of the arm with respect to the frame.