US PATENT SUBCLASS 173 / 202
.~ Hammer head driven by spring

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
202.~ Hammer head driven by spring {4}
203  DF  .~.~> Having cam to compress spring
204  DF  .~.~> Fluid spring
120  DF  .~.~> With means to adjust spring force
121  DF  .~.~> Spring retracts hammer head

DEFINITION

Classification: 173/202

Hammer head driven by spring:

(under subclass 90) Apparatus in which the motion of the hammer head, at least in one direction, is caused by the recoil of a resilient element which has been strained or compressed.