Patent ID: 8286725

Claim:
A drive mechanism for a power tool having a housing and a motor disposed in the housing and having an output shaft for actuating a working member of the tool, the drive mechanism comprising: a substantially cylindrical reciprocating member having a longitudinal axis, the reciprocating member adapted to be slidably mounted relative to said housing in a sleeve member, the reciprocating member adapted to be caused to execute reciprocating movement relative to said sleeve member in response to rotation of the output shaft, wherein said reciprocating member comprises a plurality of respective protrusions formed on a surface thereof, said plurality of protrusions adapted to slidably engage the sleeve member to reduce the area of contact between said reciprocating member and said sleeve member, and wherein said protrusions define a plurality of recesses that extend along substantially an entire length of said reciprocating member substantially parallel to the longitudinal axis and that are adapted to hold lubricant between said reciprocating member and said sleeve member.