US PATENT SUBCLASS 175 / 282
.~.~.~ Plural elements expanded into single socket

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}
281  DF  .~.~ Cutter element substantially longitudinally movable on shaft {2}
282.~.~.~ Plural elements expanded into single socket

DEFINITION

Classification: 175/282

(under subclass 281) Apparatus comprising a plurality of laterally movable cutter elements which move outwardly from the longitudinal axis of the bit head or shaft to operative position and a single socket or recess on the bit head or shaft which receives in abutting relation a portion of each cutter element when they have been moved to operative position.