US PATENT SUBCLASS 173 / 212
.~.~ Fluid spring

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
210  DF  .~ With impact cushioning means {2}
212.~.~ Fluid spring

DEFINITION

Classification: 173/212

Fluid spring:

(under subclass 210) Apparatus wherein the impact cushioning means is a fixed volume of compressible hydraulic or pneumatic fluid contained in a chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

204, for a hammer head driven by a fluid spring.