US PATENT SUBCLASS 175 / 260
.~.~ Cutter element engages torque transmitting abutment on shaft when expanded

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

257  DF  TOOL REMOVABLE OR INSERTABLE THROUGH OR AROUND DRIVING OR DRIVEN SHAFT OR CASING {2}
258  DF  .~ Laterally shiftable cutter element movable through shaft {2}
260.~.~ Cutter element engages torque transmitting abutment on shaft when expanded {1}
261  DF  .~.~.~> With additional torque transmitting abutment on bit head and shaft

DEFINITION

Classification: 175/260

(under subclass 258) Apparatus in which the shaft has an element or portion having a surface which extends substantially longitudinally and radially of the shaft and which is engaged by a portion of the cutter element so that rotary motion about the shaft axis may be transmitted from the shaft to the cutter element or from the cutter element to the shaft.

(1) Note. For the purposes of this subclass the laterally movable support for a rolling cutter, as defined in subclass 331, is considered to be part of the cutter element since the rolling cutter element itself could not have a torque transmitting surface engaging the shaft.