Patent ID: 7464452
Filing Date: 2008-12-16
Classification: B21J,F16B,F16D,Y10T

Abstract:
1. A method of connecting at least two members by a pin, comprising the steps of: disposing the members one on top of the other, each of the members having an inserting hole; inserting a hollow pin into the inserting hole of each of the members; and caulking an end portion of said hollow pin radially outward to thereby fix said members together, wherein said hollow pin is made of a metal having a surface-treated layer and is formed into a convex shape in at least part of said end portion, and wherein said caulking is made by rolling a roller over said end portion of said hollow pin so that rolling pressure applied during said caulking step is dispersed or distributed so that any damage to the surface-treated layer is prevented, wherein a parabolic shape is formed in both in an inner periphery and in an outer periphery of said end portion of said hollow pin.