Patent ID: 6553878
Filing Date: 2003-04-29
Classification: B23D,B26D,Y10T

Abstract:
A rotary torsion cutting apparatus for cutting a relatively thin metal article without deformation, deflection or burring of the article being cut, comprising:a stationary plate member having front, back and side faces, the stationary plate member further including a central axis; a rotating plate member having front, back and side faces, the rotating plate member further including an axis of rotation aligned with the central axis of the stationary plate member; a means to movably fasten the back face of the stationary plate member to the front face of the rotating plate member such that a zero gap exists between the stationary plate member and the rotating plate member, and the stationary plate member and the rotating plate member may be selectively rotated at least 90Â° relative to each other; a fixed opening extending from the front face to the back face of the stationary plate member, the fixed opening being shaped and dimensioned for receiving an article to be cut by the rotary torsion cutting apparatus; a pivot opening extending from the front face to the back face of the rotating plate member, the pivot opening being shaped and dimensioned for receiving an article to be cut by the rotary torsion cutting apparatus; said fixed and pivot openings being of the same shape, and being aligned with the central axis of the stationary plate member and the axis of rotation of the rotating plate member such that the central axis and the axis of rotation extend through the fixed and pivot openings; a means for aligning the center of said fixed opening with the center of said pivot opening; a means for rotating the rotating plate member relative to the stationary plate member; and a means for stopping the rotation of the rotating plate member at a predetermined degree; wherein relative movement between the stationary plate member and the rotating plate member causes a torsional cutting of an article positioned within the fixed opening and the pivot opening.