(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.
