US PATENT SUBCLASS 175 / 280
.~.~.~ With forwardly extending noncutting portion

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  DF  .~.~ Cam or gear means movable to shift cutter element {1}
280.~.~.~ With forwardly extending noncutting portion

DEFINITION

Classification: 175/280

(under subclass 279) Apparatus in which the laterally movable cutter element is carried on a bit head or shaft which has a portion extending inwardly toward the axis of the shaft and forward of the cutter element in the direction of boring and which has no cutting function.

SEE OR SEARCH THIS CLASS, SUBCLASS:

283, for similar laterally shiftable cutter elements in which the cutter elements are longitudinally movable on the shaft.

406+, and the subclasses there noted, for other cutters with a forwardly extending noncutting portion.