US PATENT SUBCLASS 175 / 278
.~.~.~.~ Latch return shifting mechanism to inoperative position

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  DF  .~.~.~ Latch holds mechanism retracted {1}
278.~.~.~.~ Latch return shifting mechanism to inoperative position

DEFINITION

Classification: 175/278

(under subclass 277) Apparatus in which the movable latch member also acts on the mechanism to cause the mechanism to be moved to its inactive or inoperative position to permit retraction of the cutter element.

(1) Note. Generally the latch member engages the lower end of a casing when it is desired to retract the cutter element by lifting the shaft and cutter element and this motion causes the latch member to move the spring mechanism to its inoperative or inactive position.