US PATENT SUBCLASS 175 / 281
.~.~ Cutter element substantially longitudinally movable on shaft

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}
281.~.~ Cutter element substantially longitudinally movable on shaft {2}
282  DF  .~.~.~> Plural elements expanded into single socket
283  DF  .~.~.~> With forwardly extending noncutting portion

DEFINITION

Classification: 175/281

(under subclass 274) Apparatus in which the laterally movable cutter element is carried on the bit head or shaft so that the cutter element is bodily movable generally longitudinally relative to the bit head or shaft to cause movement of the cutter element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

251, for a core retaining or severing means actuated by relative movement of bit and tool shaft.

288, for laterally shiftable cutter elements which are movable longitudinally relative to an expanding cam or gear means.