US PATENT SUBCLASS 173 / 138
.~.~ With means to conduct motive fluid to or from striking face

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
206  DF  .~ Hammer head constitutes piston of drive motor {4}
138.~.~ With means to conduct motive fluid to or from striking face

DEFINITION

Classification: 173/138

(under subclass 134) Apparatus in which a passage or port is provided to conduct fluid motive material to or from the surface of the element that strikes the blow, generally for the purpose of cooling, lubrication or the removal of leakage motive fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

135+, for a hammer head which constitutes the piston of a drive motor, in which motive fluid is applied to the striking face.