US PATENT SUBCLASS 173 / 54
.~ With fixed means cyclically contacted by grip structure

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.~ With fixed means cyclically contacted by grip structure {1}
55  DF  .~.~> Contact moves grips out of shaft engagement

DEFINITION

Classification: 173/54

(under subclass 53) Apparatus in which during each cycle of reciprocation the grasp means engages a stationary structure to cause the grasp means to release or slip the rod or rod like means to permit the hammer head or tool to move forward as the work progresses.