US PATENT SUBCLASS 175 / 287
.~.~.~ With separate latch holding cutter element in shifted 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}
284  DF  .~ Cutter element shifted by longitudinally relatively movable parts {2}
286  DF  .~.~ Cam or gear engaging cutter element {3}
287.~.~.~ With separate latch holding cutter element in shifted position

DEFINITION

Classification: 175/287

(under subclass 286) Apparatus combined with a movable member which is separate from the laterally movable cutter element or the cam or gear and which engages a portion of the movable parts to hold the cutter element in the position in which it is displaced laterally of the bit head the maximum distance from the longitudinally axis of the bit head or shaft.

(1) Note. A latch is considered to be separate from the cutter element, cam or gear for the purposes of this definition even though it may be formed as a unitary part of these elements if its latching function is independent of the action which moves the cutter element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

290, and subclasses there noted, for other laterally shiftable cutter elements with latches.