US PATENT SUBCLASS 173 / 135
.~.~ Motive fluid applied to 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}
135.~.~ Motive fluid applied to striking face {2}
136  DF  .~.~.~> Supplied through passage in striking face
137  DF  .~.~.~> Reduced area striking face

DEFINITION

Classification: 173/135

(under subclass 134) Apparatus in which fluid motive material is applied to cause movement of the element, upon the surface of the element that strikes the blow.