US PATENT SUBCLASS 172 / 262
.~ Alternate tool brought into operation upon shift

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

261  DF  OVERLOAD SHIFTING {6}
262.~ Alternate tool brought into operation upon shift

DEFINITION

Classification: 172/262

(under subclass 261) Apparatus in which the earth working element, upon the occurrence of an overload, shifts to an inoperative position and a second earth working element is brought into operative position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

528+, for a rolling earth working element with means to stop or retard rotation at will.