| 摘要 |
A sprocket including spaced rims with sprocket teeth confined between the rims. The rims cooperatively define a configured periphery with link-supporting arc portions located at the teeth tips and flat sections extended between the arc portions. As a side link approaches the sprocket, the leading lower corner (the toe of the leading footprint) passes over a flat portion to remain out of contact with the sprocket. The following supporting arc portion rotates up into the notch formed in the bottom edge of the side link to support the side link as it travels around the sprocket. The hammering effect of the leading lower corner of the side link impacting the sprocket of prior devices is avoided.
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