US PATENT SUBCLASS 173 / 14
.~ Reciprocating drive member connected to pulsing fluid column

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

13  DF  DRIVE CONTROLLED BY RELATIVE AXIAL MOVEMENT OF TOOL {2}
14.~ Reciprocating drive member connected to pulsing fluid column

DEFINITION

Classification: 173/14

(under subclass 13) Apparatus in which the relative movement starts the operation of the tool drive by causing a reciprocating element of the tool drive to be mechanically coupled to and directly operated by the pulsation or reciprocation of a confined mass of fluid.