US PATENT SUBCLASS 301 / 51
.~.~.~.~ Spring moved

Current as of: June, 1999
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301 /   HD   LAND VEHICLES: WHEELS AND AXLES

5.1  DF  WHEEL {21}
41.1  DF  .~ Traction increasing {5}
43  DF  .~.~ Projecting cleat {2}
45  DF  .~.~.~ Movable {2}
51.~.~.~.~ Spring moved

DEFINITION

Classification: 301/51

(under subclass 45) Wheel wherein the cleat is moved to a projected position by a spring.

SEE OR SEARCH CLASS

172, Earth Working,

544, for a rolling earth working tool with a spring mounted tooth or blade.

305, Wheel Substitutes for Land Vehicles,

5, for spring-biased elements movably mounted on the rim of a wheel forming ground-engaging feet as the wheel rotates.