Patent ID: 7707729

Claim:
A reciprocating saw, comprising; a housing; a drive shaft rotatably mounted in said housing; a motor in the housing for driving said drive shaft; an elongated plunger located in said housing for reciprocating motion, said plunger being driven by a wobble plate interface structure and pivotally supported in a front bushing in a manner which does not prohibit rotation of said plunger about an axis of rotation aligned with the longitudinal axis of said plunger, said plunger having a front end portion for attaching a tool, and an enlarged rear end spherical portion; a counterweight assembly including a movable counterweight and a drive arm for moving said counterweight located in said housing, said counterweight having an opening for receiving said plunger, wherein said opening has at least cylindrical side wall portions that are sized and configured to directly contact and support said rear end spherical portion of said plunger as said plunger and counterweight move relative to one another; a first wobble plate assembly operatively connected to said drive shaft and having a first wobble plate interface structure for engaging and reciprocating said plunger in said front bushing and said counterweight; and a second wobble plate assembly operatively connected to said drive shaft and having a second wobble plate interface structure for engaging said drive arm of said counterweight assembly.