Patent ID: 6360643
Filing Date: 2002-03-26
Classification: B23D,B23K,B26D,Y10T

Abstract:
An apparatus for shearing sheet material so as to leave a straight cut edge on said sheet material comprising:a) a shear assembly including an upper frame and a lower frame; b) a die assembly mounted within the shear assembly, the die assembly including an upper die shoe and a lower die shoe, the upper die shoe including an upper clamp and an upper blade, the lower die shoe including a lower clamp and a lower blade; c) a hydraulic cylinder and piston-sub-assembly mounted on said upper frame and adapted to drive said upper die shoe downwardly toward said lower die shoe; d) said upper clamp including a series of clamping segments arranged to contact and clamp the sheet material against the lower clamp in a prescribed sequence; e) said upper blade having a lower surface which engages and drives sheet material downwardly past an upper surface on said lower blade so as to shear a portion of sheet material off of the main body of sheet material; f) said lower surface of said upper blade being raked at an angle relative to said upper surface on said lower blade along its length; g) said clamping segments being positioned on said upper die shoe to contact and clamp the sheet material against the lower clamp in a sequence when the said upper shoe is moved toward said lower shoe.