US PATENT SUBCLASS 305 / 141
.~.~ With vertically movable wheel support

Current as of: June, 1999
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305 /   HD   WHEEL SUBSTITUTES FOR LAND VEHICLES

124  DF  WITH TRACK SUPPORT INTERMEDIATE OF END WHEELS {4}
129  DF  .~ With roller support contacting lower track run {9}
141.~.~ With vertically movable wheel support

DEFINITION

Classification: 305/141

With vertically movable wheel support:

(under subclass 129) Apparatus wherein the holding means includes a frame and a plurality of a circular rim with a hub or a disc, capable of rotating on a central axis, mounted on the frame and being individually positionable perpendicular to the direction of the vehicle motion.