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US 4,762,043 AGranted
Long wearing punch
AssigneeJacob L. Reich
InventorSonny Sneed
Life of this patent
Estimating the term…
Abstract
An improved punching tool having a long wearing characteristic and characterized in having at least first and second punching edges disposed on the leading end of the punch body wherein these punching edges are separated by an annular groove and wherein the trailing punching edge is slightly smaller in diameter than the leading punching edge.
Claims3
A tool for use with a punching press for punching holes in workpieces,
- comprising:
- (a) an elongate body having first and second ends;
- (b) said first end having means for releasable engagement by the punching press and said second end having a working surface to engage the workpiece to be punched;
- (c) said working surface comprising at least first and second punching edges
- (1) formed on said second end of said body;
- and
- (2) disposed in axially spaced relationship thereon;
- and
- (d) said first punching edge being formed on the leading end of said second end of said body and said second punching edge having a diameter less than the diameter of said first punching edge;
- said first punching edge engaging the workpiece in advance of engagement therwith by said second punching edge.
7 more elements
Dependencies are inferred from the claim text.