Patent ID: 7607969
Filing Date: 2009-10-27
Classification: B21L,B24B,F16G

Abstract:
1. A grinding apparatus for a pin for use in power transmission chain comprising: a grinding wheel portion which is a rotary member rotated about a first axis parallel to a Z-direction provided that three directions orthogonal to one another are defined as an X-direction, a Y-direction and the Z-direction, and which includes a pair of grinding surfaces at an outer circumferential area thereof for simultaneously grinding opposite end faces of a pin for use in power transmission chain as a grinding subject, the grinding wheel portion being shaped like a disc with the grinding surfaces thereof defined by axially opposite walls of a circumferential groove formed by cutting inwardly an outer periphery of the grinding wheel portion, wherein each of the grinding surfaces is conically inclined and finished to form a minute concave with a curvature radius defined in a cross-section of an X-Z plane including the first axis; and a carrier which supports the pin for use in power transmission chain in parallel to the Z-direction as allowing the opposite end faces of the pin to project therefrom, and which moves the pin for use in power transmission chain relative to the grinding surfaces on an X-Y plane, thereby passing the pin for use in power transmission chain through a space between the pair of rotated grinding surfaces.