US PATENT SUBCLASS 173 / 121
.~.~ Spring retracts hammer head

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
202  DF  .~ Hammer head driven by spring {4}
121.~.~ Spring retracts hammer head

DEFINITION

Classification: 173/121

(under subclass 119) Apparatus in which the recoil of the resilient element retracts the hammer head from delivering a blow.