Patent ID: 6105261
Filing Date: 2000-08-22
Classification: B26B,Y10S

Abstract:
In a self-sharpening blade having a cutting edge, the combination comprisinga) a layered structure,b) said structure including a first layer extending to the blade cutting edge, and substantially defining said cutting edge,c) said structure also including a second layer located at one side of said first layer,d) wear resistance of said first layer being superior to wear resistance of said second layer,e) said first layer thickness being less than about 1.5 mm and substantially equal to or less than an ultimate tip diameter defined as the diameter of the very tip of the blade cutting edge; said tip having an exposed, outer convex surface, said tip diameter providing the best cutting action in the intended service of said self-sharpening blade,f) said first and second layers being reduced in thickness under pressure, and having compacted configurations, said first layer thickness being between about 3000 Angstroms and 1.5 mm, andg) said first layer having increased wear resistance formed by heat treating at elevated temperature.