Patent ID: 7901269
Filing Date: 2011-03-08
Classification: B21L,B24B,F16G

Abstract:
1. A grinding apparatus comprising: a grinding wheel portion which is a rotary member including a pair of grinding surfaces at an outer circumferential area thereof for simultaneously grinding opposite end faces of a pin for use in a power transmission chain as a grinding subject; and a carrier which includes a pin retainer for retaining the pin in parallel to a rotary axis of the grinding wheel portion as allowing the opposite end faces of the pin to project from the pin retainer, and which is rotated about an axis parallel to the rotary axis of the grinding wheel portion thereby passing the pin retained by the pin retainer through space between the pair of rotated grinding surfaces, wherein the pin retainer includes: a pin retaining surface against which a first lateral side surface of the pin is pressed and which extends in parallel to the rotary axis of the grinding wheel portion and intersects a direction of grinding the opposite end faces of the pin; and an elastically deformable holder member cooperating with the pin retaining surface to removably clamp the pin pressed against the pin retaining surface, wherein the carrier has a step structure at an outer periphery thereof, the step structure is defined by a step surface where the holder member is fixed, the pin retaining surface, and an intermediate surface extending between the step surface and the pin retaining surface, and the intermediate surface is not parallel to the step surface and the pin retaining surface, and wherein a second lateral side surface of the pin is pressed against the intermediate surface, and the second lateral side surface of the pin is not parallel to the first lateral side surface of the pin.