US PATENT SUBCLASS 175 / 284
.~ Cutter element shifted by longitudinally relatively movable parts

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.~ Cutter element shifted by longitudinally relatively movable parts {2}
285  DF  .~.~> Toggle or linkage between movable parts
286  DF  .~.~> Cam or gear engaging cutter element {3}

DEFINITION

Classification: 175/284

(under subclass 263) Apparatus in which the cutter element is moved laterally by the relative bodily movement of a plurality of parts carried by the bit head or shaft, which parts move relative to each other in the direction of the longitudinal axis of the shaft.

(1) Note. One of the parts may be the cutter element itself or one of the parts may be a fixed portion of the bit head or shaft.

(2) Note. The mere pivoting of a cutter element on the bit head or shaft about a fixed pivot is not included since there is no bodily relative movement as required by the above definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

272, for laterally shiftable cutter elements shifted by relatively longitudinally movable threaded elements.

279+, and 281+, for laterally shiftable cutter elements shifted by longitudinally movable parts which are spring biased to operative position.