US PATENT SUBCLASS 173 / 89
.~.~.~ Drive permits hammer or tool to freely drop

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

81  DF  MEANS TO CONTROL ADVANCE AND CYCLICALLY RECIPROCATE A CABLE-OPERATED HAMMER OR TOOL {5}
86  DF  .~ Relatively elevated guide engaging cable between drive and hammer or tool {2}
88  DF  .~.~ Drive is oscillating cable engaging means {1}
89.~.~.~ Drive permits hammer or tool to freely drop

DEFINITION

Classification: 173/89

(under subclass 88) Apparatus in which the drive to the oscillating cable engaging element is cyclically disconnected to permit the hammer head or tool to substantially freely drop under the sole influence of gravity.