US PATENT SUBCLASS 172 / 480
.~ Tool swung about freely shiftable or delayed pivot


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

452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
480.~ Tool swung about freely shiftable or delayed pivot


DEFINITION

Classification: 172/480

(under subclass 452) Apparatus in which the earth working element is raised by moving it about a transverse axis which is free to move vertically or longitudinally when the earth working element is in earth-engaging position or in which the earth working element is carried by a beam which is raised until some point thereon engages a point on the supporting frame at which time said points form a pivot axis about which the beam swings.

(1) Note. An earth working element which is connected to the supporting frame by a mere chain, cable, or the like is not included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

473, for tools positively adjusted vertically at longitudinally spaced points.

474, for tools vertically adjustable about a transverse axis which is also vertically adjustable.