Patent ID: 8230608
Filing Date: 2012-07-31
Classification: B23D,Y10T

Abstract:
1. A drive apparatus for a reciprocating tool, comprising; a housing; a rotatable drive shaft assembly located in said housing; an elongated plunger located in said housing for reciprocating motion, said plunger having a front end portion for attaching a cutting blade thereto; a rotary joint elongated rocker having a lower end portion with a stationary lower pivot connection to said housing and an upper end with a reciprocating upper pivot connection to a mid portion of said plunger wherein said lower pivot connection and said upper pivot connection of said rocker align along a longitudinal center line of said rocker; a wobble plate interface operatively connected to said drive shaft assembly, a lower portion having an effective lower pivot connection, said interface also having an upper pivot connection to a rear portion of said plunger and configured to reciprocate said plunger generally in a lengthwise direction of said plunger during alternating cutting stroke and a return stroke; wherein distances between said upper and lower pivot connections of both said rocker and wobble plate interface together with a distance between said upper pivot connections thereof producing a path of movement of an attached cutting blade that is effective to apply a progressive non-linear cutting force to a workpiece during said cutting stroke.