Non-circular slug splitter punch
Patent 4905557 Issued on March 6, 1990. Estimated Expiration Date: 
August 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 294991 389404 2214701 3296905 Draw punch Slug-splitting punch Patent #: 4543722 InventorAssigneeApplicationNo. 235368 filed on 08/23/1988US Classes:83/681, To punch and cut punched article30/360, With portion positioned in work aperture83/688, Plural spaced successively operative shearing portions83/689Progressive cuttingExaminersPrimary: Yost, Frank T.Assistant: Rada, Rinaldi I. Attorney, Agent or FirmInternational ClassB26F 001/14AbstractThe punch comprises peripheral cutting edges and lateral cutting edges. The peripheral edges cut a slug in the desired shape, for examples, rectangular, square, oval, trapezoidal, D and double D-shaped, etc. while the lateral edges cut transversely from one peripheral edge to an opposite peripheral edge, thereby splitting the slug. Lateral cutting edges provide a dividing line across the working face. Surfaces and cutting edges on each side of the dividing line are similar and canted at opposite angles. Lateral cutting edges and peripheral cutting edges at their juncture provide pyramidal cutting sections which initially pierce the workpiece and initiate lateral slug splitting. This split grows from the slug periphery toward the center. Splitting is complete before a substantial portion of the slug periphery is cut. | |
