US PATENT SUBCLASS 173 / 82
.~ With means to synchronize advance with reciprocating drive

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}
82.~ With means to synchronize advance with reciprocating drive

DEFINITION

Classification: 173/82

(under subclass 81) Apparatus in which the means to reciprocate the hammer head or tool cyclically actuates a means to control forward movement of the hammer head or tool so that the advance is only permitted at a certain point in each cycle of reciprocation.