Patent ID: 7891925
Filing Date: 2011-02-22
Classification: B27B,B28D,Y10T

Abstract:
1. A rivet for securing side links to center links of a cutting chain comprising: a flange portion having a circumferential surface positioned to engage a rivet hole of a center link, the circumferential surface having a first hardness; opposing hub portions extending from opposing sides of the flange for engaging rivet holes of side links, the opposing hub portions having a second hardness configured to deform during a rivet forming operation and an end that is hardened to a third hardness greater than the second hardness; and opposing shoulder portions, each defined by a junction between the flange and a respective hub and that extends at least partially into the flange portion and the hub portion, wherein the shoulder portions have a fourth hardness that is less than the first hardness and greater than the second hardness.