US PATENT SUBCLASS 173 / 210
.~ With impact cushioning means

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

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

DEFINITION

Classification: 173/210

With impact cushioning means:

(under subclass 90) Apparatus including resilient or flexible structure which is external to the hammer head or drive therefor which functions to absorb a blow under some condition of operation, or is adopted to cushion against the transmission of vibrations resulting from the operation of the hammer drive.