US PATENT SUBCLASS 175 / 286
.~.~ Cam or gear engaging 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}
284  DF  .~ Cutter element shifted by longitudinally relatively movable parts {2}
286.~.~ Cam or gear engaging cutter element {3}
287  DF  .~.~.~> With separate latch holding cutter element in shifted position
288  DF  .~.~.~> Cutter element substantially longitudinally movable on shaft
289  DF  .~.~.~> Cutter element spring biased to retracted position

DEFINITION

Classification: 175/286

(under subclass 284) Apparatus in which one of the relatively longitudinally movable parts comprises the transversely movable cutter element and another of the parts comprises a cam or gear element having a portion engaging the cutter element so that as the parts move longitudinally relative to

each other the cutter element will be moved transversely of the bit head.

SEE OR SEARCH THIS CLASS, SUBCLASS:

279+, for laterally shiftable cutter elements shifted by a cam or gear mechanism which spring biases the cutter to operative position.