Patent ID: 7686721
Filing Date: 2010-03-30
Classification: B62M

Abstract:
1. A bicycle chainring having a center rotational axis comprising: a first member having an annular shape; and a second member having an annular shape, at least one of the first member and the second member being formed with an annular tooth portion with a plurality of chain engaging gear teeth, the first member including a crank attachment portion with a plurality of chainring attachment openings, and the second member including an inner peripheral portion with a plurality of chainring attachment openings, the first and second members being fixedly attached to overlie each other without obstructing access to the chainring attachment openings of the first and second members, and the inner peripheral portion overlying the crank attachment portion of the first member and being formed with an axially extending wall that is disposed axially between the first and second members with respect to the center rotational axis and that extends toward the first member in an axial direction along the center rotational axis, the axially extending wall including at least first and second wall portions located at each of the chainring attachment openings of the second member, the at least first and second wall portions extending along an inner edge of the inner peripheral portion with a hollow interior area being at least partially formed axially between axially spaced faces of the first and second members and between the at least first and second wall portions of the axially extending wall.