US PATENT SUBCLASS 172 / 556
.~.~ Tooth or blade axially clamped to hub face (e.g., hoe wheel type, etc.)

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}
556.~.~ Tooth or blade axially clamped to hub face (e.g., hoe wheel type, etc.)

DEFINITION

Classification: 172/556

(under subclass 540) Apparatus in which the teeth or blades are attached to a generally thin wheel or hub-like rotary support by a locking or clamping means which means itself extends, or exerts a clamping force which extends, in a direction parallel to the axis of rotation of said support.

SEE OR SEARCH CLASS

301, Land Vehicles: Wheels and Axles,

44.1+, for vehicle wheels having detachably mounted thereon traction increasing spurs or cleats.