US PATENT SUBCLASS 172 / 546
.~.~.~ With means for causing movement

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
540  DF  .~ Tool has circumferentially spaced teeth, tines, blades or the like {13}
545  DF  .~.~ Blades or teeth change position relative to each other or rotating support during rotation {1}
546.~.~.~ With means for causing movement

DEFINITION

Classification: 172/546

(under subclass 545) Apparatus in which means are provided for causing the movement to take place.

SEE OR SEARCH THIS CLASS, SUBCLASS:

92+, for similar devices wherein the rotating element is positively driven from a power source.

96, for similar devices wherein the rotating element is positively driven from a power source and the means for causing movement is a spring.

541, for a moving means operable to prevent ground engagement of the tines.

544+, for spring mounting or moving means.

SEE OR SEARCH CLASS 301, Land Vehicles: Wheels and Axles,

48, and 49 for vehicle wheels having traction increasing spurs or cleats thereon, there being provided a means for alternately projecting and retracting the spurs on cleats

during each revolution of the wheel.