US PATENT SUBCLASS 173 / 55
.~.~ Contact moves grips out of shaft engagement

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

53  DF  HAMMER OR TOOL SHAFT RECIPROCATED BY GRIPPING MEANS WHICH RELEASE OR YIELD TO PERMIT ADVANCE {2}
54  DF  .~ With fixed means cyclically contacted by grip structure {1}
55.~.~ Contact moves grips out of shaft engagement

DEFINITION

Classification: 173/55

(under subclass 54) Apparatus in which cyclic engagement of the grasp means with the stationary structure positively releases the grasp means from the rod or rod like structure.