US PATENT SUBCLASS 172 / 545
.~.~ Blades or teeth change position relative to each other or rotating support during rotation

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.~.~ Blades or teeth change position relative to each other or rotating support during rotation {1}
546  DF  .~.~.~> With means for causing movement

DEFINITION

Classification: 172/545

(under subclass 540) Apparatus in which the projecting means change their position relative to each other while the device as a whole is rotating, or are in movable relation to a rotating support therefor while the support is rotating.

SEE OR SEARCH THIS CLASS, SUBCLASS:

91, for driven implements wherein the teeth, blades, or tines therefor are moved or are movable relative to a driven carrier portion thereof.

541, for rolling supports having movable mounted thereon teeth, blades, tines, or the like which are movable to a position in which the teeth, etc., are prevented from engaging the ground.

543, for rolling or rotating implements with spring teeth.

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

45+, for vehicle wheels having movable mounted thereon traction increasing spurs or cleats.