Perforating punch
OwnerYoshihisa Negishiinventor
Life of this patent
Estimating the term…
Abstract
A perforating punch has first, second, third, and fourth tips, a first diagonal ridge contiguous to the first and second tips, a second diagonal ridge contiguous to the third and fourth tips, and an included angle setting point located at the point of intersection between the first and second diagonal ridges and positioned longitudinally of the perforating punch to bend the first and second diagonal ridges for thereby establishing included angles at the first, second, third, and fourth tips. The perforating punch allows an included angle and a shear angle thereof to be established independently for each of the four sides of a rectangular perforation to be produced, and is capable of establishing cutting conditions easily in a wide range.
Claims10
A perforating punch for forming a rectangular perforation in a workpiece, comprising:
- a shank of a rectangular cross-sectional shape;
- first and second tips located respectively at diagonally spaced positions corresponding to two of the four corners of the rectangular cross-sectional shape;
- third and fourth diagonally spaced tips located respectively at diagonally spaced positions corresponding to two of the four corners of the rectangular cross-sectional shape;
- a first diagonal ridge contiguous to said first and second tips;
- a second diagonal ridge contiguous to said third and fourth tips;
- and
- an included angle setting point located at the point of intersection between said first and second diagonal ridges and positioned longitudinally of said shank to bend said first and second diagonal ridges for thereby establishing included angles at said first, second, third, and fourth tips.
Dependencies are inferred from the claim text.