Patent ID: 7200940
Filing Date: 2007-04-10
Classification: B21J,Y10T

Abstract:
1. An apparatus for modifying a generally planar surface of a work piece, said apparatus comprising: first and second rows of blades, each blade comprising a generally planar blade member having a body portion and a plurality of teeth at the bottom of said body portion, said teeth presenting cutting edges to a surface, said first row of blades having teeth extending in a first longitudinal direction, said second row of blades having teeth extending in an opposite longitudinal direction; biasing means urging said first row of blades apart from said second row of blades in the longitudinal axis direction; a first actuator extending through a retaining member and through said body portions of said first row of blades; a second actuator extending through said retaining member and through said body portions of said second row of blades; said retaining member having a pair of side walls juxtaposed with the outer blades of said first and second rows of blades, for retaining said rows of blades in a side by side relationship and for retaining said biasing means, each of said side walls having longitudinally extending slots formed therein to receive said first and second actuators; and a housing member designed to receive said blades, said retaining member, and said first and second actuators, said housing member having means for guiding said actuators such that upon a force being exerted on said housing member, said actuators cause said blades to move in opposite directions.