US PATENT SUBCLASS 173 / 112
.~ With means to cause or control advance of 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}
112.~ With means to cause or control advance of hammer head {1}
113  DF  .~.~> Advance operated by hammer drive or actuated in response to hammer vibration

DEFINITION

Classification: 173/112

(under subclass 90) Apparatus including a means to positively cause or progressively control the forward movement of the hammer head in driving the tool into or along the work, such motion being in addition to the regular impacting motion of the hammer head.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141, and see the search notes therein for an advance causing or controlling means for a tool or tool drive.