US PATENT SUBCLASS 175 / 275
.~.~ With separate latch

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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.~.~ With separate latch {2}
276  DF  .~.~.~> Frangible or discardable element
277  DF  .~.~.~> Latch holds mechanism retracted {1}

DEFINITION

Classification: 175/275

(under subclass 274) Apparatus combined with a movable member which is separate from the laterally movable cutter element and which engages the cutter element or some part of the resiliently biased mechanism to hold the cutter element in one position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

271, for laterally shiftable cutter elements having a latch operated by fluid pressure or a dropped element.