US PATENT SUBCLASS 175 / 289
.~.~.~ Cutter element spring biased to retracted position

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

263  DF  CUTTER ELEMENT LATERALLY SHIFTABLE BELOW GROUND (E.G., EXPANSIBLE) {13}
284  DF  .~ Cutter element shifted by longitudinally relatively movable parts {2}
286  DF  .~.~ Cam or gear engaging cutter element {3}
289.~.~.~ Cutter element spring biased to retracted position

DEFINITION

Classification: 175/289

(under subclass 286) Apparatus in which the laterally movable cutter element is resiliently urged to move laterally of the bit head or shaft in the direction in which the cutter element would be in an inoperative or noncutting position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

291, and the search there noted for other spring biased laterally shiftable cutters.