US PATENT SUBCLASS 175 / 245
.~ Core bit closure relative upwardly movable by core

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}
245.~ Core bit closure relative upwardly movable by core

DEFINITION

Classification: 175/245

(under subclass 244) Apparatus in which the movable means comprises an element initially closing the core receiving opening in the tool, said means being moved away from the working face of the tool as the core is formed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

307, for a means adapted to initially cover the cutting edges of a bit.