US PATENT SUBCLASS 175 / 279
.~.~ Cam or gear means movable to shift cutter element

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}
274  DF  .~ With shifting mechanism spring biased to operative position {3}
279.~.~ Cam or gear means movable to shift cutter element {1}
280  DF  .~.~.~> With forwardly extending noncutting portion

DEFINITION

Classification: 175/279

(under subclass 274) Apparatus in which the shaft or bit head is provided with a cam or gear element other than the cutter element which is movable thereon, said element having a portion which engages the laterally movable cutter element or a part connected thereto to cause the cutter element to be moved.

SEE OR SEARCH THIS CLASS, SUBCLASS:

273, for laterally shiftable cutter elements movable by a cam or gear axially rotatable relative to the shaft.

286+, for laterally shiftable cutter elements moved by a longitudinally relative movable cam or gear.