Patent ID: 7509744
Filing Date: 2009-03-31
Classification: B23D

Abstract:
1. A power tool that imparts a reciprocating motion on a cutting blade, the power tool comprising: a tool housing containing a motor having a motor shaft; a drive gear rotatably supported in said tool housing and engaged to said motor shaft; an annular cam surface that extends from a face of said drive gear; a blade support housing defining an aperture; an output shaft slidably received in said aperture and adapted to connect to the cutting blade, wherein said output shaft is connected to said drive gear and is operable to reciprocate along a cutting axis that is generally perpendicular to a cutting direction; trunnions that extend from said blade support housing and pivotally connect said blade support housing in said tool housing; a cam follower connected to said blade support housing and operable to engage said annular cam surface on said drive gear to impart a pendulum action on said blade support housing when said drive gear rotates relative to said cam follower; a scroll member connected to said blade support housing, wherein rotation of said scroll member rotates said output shaft about the cutting axis to change said cutting direction of the cutting blade; a mode selector member rotatably disposed in the housing; and a locking arm disposed on said blade support housing and connected to said mode selector member, wherein said mode selector member is moveable to position said locking arm between a first position, a second position and a third position, wherein said locking arm is positioned to permit rotation of said scroll member and prevent said cam follower from contacting said annular cam surface on said drive gear when said locking arm is in said first position, wherein said locking arm is positioned to inhibit rotation of said scroll member and prevent said cam follower from contacting said annular cam surface when said locking arm is in said second position and wherein said locking arm is positioned to inhibit rotation of said scroll member and permit said cam follower to contact said annular cam surface when said locking arm is in said third position.