Hand held power machine with oscillating tool

Claim 1

A hand-held power machine for aiding an operator in performing work, said machine comprising a main support member, said main support member being provided with handle means to facilitate the holding of said machine by the operator thereof, power means attached to said main support member, a connecting means connected to said power means, said connecting means comprising crank means operated by said power means, a push-pull rod attached to said crank means, said rod extending generally parallel to said main support means and being moved back and forth relative to said main support means by said crank means as said crank means is operated by said power means, a first link pivotally mounted on one end thereof to one end of said main support member, a second link pivotally mounted on one end thereof to said one end of said first link and said one end of said main support member, a third link pivotally mounted on one end thereof to the opposite end of said first link, said second link and said third link being pivotally connected to said push-pull rod at longitudinally spaced locations along said rod, said locations being spaced sufficiently such that along with the spacing of said second link and said third link by said first link, said second link and said third link are maintained generally parallel to each other, the other end of said second link and the other end of said third link being pivotally connected to a tool holding link at spaced locations on said tool holding link, a tool attached to said tool holding link, whereby as said push-pull bar is moved back and forth by said power means, said tool is caused to move in a cyclical oscillatory motion.