US PATENT SUBCLASS 175 / 251
.~.~ Actuated upon relative movement between tool and tool shaft

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

244  DF  WITH MEANS MOVABLE RELATIVE TO TOOL TO RECEIVE, RETAIN, OR SEVER UNDISTURBED CORE {3}
249  DF  .~ Core-retaining or severing means {5}
251.~.~ Actuated upon relative movement between tool and tool shaft {1}
252  DF  .~.~.~> Relative rotary movement

DEFINITION

Classification: 175/251

(under subclass 249) Apparatus in which a relative movement between the tool and tool shaft (1) moves the core retaining or severing means into engagement with the core or (2) releases the core retaining or severing means so that they can move into core engagement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

281, and 284, for expansible cutter element shifted by relative longitudinal movement of shaft.