US PATENT SUBCLASS 305 / 123
.~.~ Rollers engage toothed wheel or frame

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

120  DF  WITH FRAME CARRIED ENDLESS TRACK {1}
121  DF  .~ With roller antifriction means {2}
123.~.~ Rollers engage toothed wheel or frame

DEFINITION

Classification: 305/123

Rollers engage toothed wheel:

(under subclass 121) Apparatus wherein the ball or a cylinder of hard material contacts the sprocket wheel. [figure] [caption]A - Rigid frame; B - Transverse axles; C - Rubber tires; D - Cleat or tread; E - Endless band; F - Sprocket wheel; G - Vertical rigid support; H - Rollers; J - Rollers