US PATENT SUBCLASS 175 / 277
.~.~.~ Latch holds mechanism retracted

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}
275  DF  .~.~ With separate latch {2}
277.~.~.~ Latch holds mechanism retracted {1}
278  DF  .~.~.~.~> Latch return shifting mechanism to inoperative position

DEFINITION

Classification: 175/277

(under subclass 275) Apparatus in which the movable latch

member acts to hold the laterally movable cutter element in an inoperative or noncutting position.