Patent ID: 9393607
Filing Date: 2016-07-19
CPC Classification: B21D,B26F,Y10T

Claim Text:
1. An assembly comprising: a die comprising a base wall having a perimeter, an outer surface and an inner surface, a depending wall extending from said perimeter, a passageway extending through said base wall, and a central axis extending through said passageway, said outer surface of said base wall being perpendicular to said central axis, said inner surface of said base wall having a first portion which is angled relative to said central axis at a first angle which is greater than 90 degrees, and a second portion which is angled relative to said central axis at a second angle which is greater than 90 degrees, said first and second angles being different, said first portion extending from said depending wall to said second portion, said second portion extending from said first portion to said passageway; and a punch comprising a body having a bore therethrough and defining a central axis, a leading edge on said body capable of piercing a workpiece, and cutting edges on said body for cutting a hole in the workpiece, said leading edge having first and second piercing points and an inclined surface extending from each piercing point to said bore, said inclined surfaces engaging with said second portion of said inner surface of said die and said first and second piercing points do not engage with said inner surface of said base wall of said die when said leading edge engages with said inner surface of said base wall of said die.