US PATENT SUBCLASS 175 / 300
.~ With releasable means to detachably retain telescoping members against axial reciprocation


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

293  DF  BELOW-GROUND (1) HAMMER, OR (2) IMPACT MEMBERS {7}
300.~ With releasable means to detachably retain telescoping members against axial reciprocation {3}
301  DF  .~.~> Frangible
302  DF  .~.~> Condition for release adjustable {1}
304  DF  .~.~> Resiliently biased latch


DEFINITION

Classification: 175/300

(under subclass 293) Apparatus in which means are provided on one of the telescoping members for engaging and holding the other member against axial movement with said reciprocation limiting means in spaced relation, said holding means being selectively releasable to allow relative axial movement between the members.