US PATENT SUBCLASS 173 / 101
.~ Plural relatively moved hammer heads


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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
101.~ Plural relatively moved hammer heads {2}
102  DF  .~.~> One impacts another
103  DF  .~.~> Concentric


DEFINITION

Classification: 173/101

(under subclass 90) Apparatus in which the hammer includes plural relatively movable impacting heads which are adapted to alternately impart cyclic impacts to a tool.

(1) Note. The impacting heads do not necessarily directly impact the tool but may impact one another or a common anvil.

SEE OR SEARCH THIS CLASS, SUBCLASS:

51, for power paths from a single drive to plural hammer heads or tools.

94+, for an impacting device having a hammer head which moves in an arcuate path, and including such devices having plural hammer heads.