US PATENT SUBCLASS 175 / 252
.~.~.~ Relative rotary movement

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  DF  .~.~ Actuated upon relative movement between tool and tool shaft {1}
252.~.~.~ Relative rotary movement

DEFINITION

Classification: 175/252

(under subclass 251) Apparatus in which the core retaining or severing means move into core engagement upon relative rotational movement between the tool and tool shaft.

SEE OR SEARCH THIS CLASS, SUBCLASS:

272, and 273, for expansible cutter element shifted by relative rotary movement between tool and shaft.