Patent ID: 7803080

Claim:
A link for a chain for use with a sprocket, the link comprising a body having a pair of apertures for receiving connecting pins comprising a pin and a rocker pin, the apertures being spaced apart by a pitch distance, and having a pitch line passing through the apertures; and a pair of teeth having outside flanks, and inside flanks between the teeth defining a crotch, the link being formed to drivingly contact sprocket teeth of the sprocket on the inner flanks of the link; wherein the improvement comprises: a) a ratio of a distance between the pitch line and a line which is parallel to the pitch line and contacts both of the inner flanks at a location where the distance between each contact point is 0.5 times the pitch distance to a product of the pitch distance and the tangent of an effective inner flank angle between a line tangent to the inner flank of the link at a distance 0.25 times the pitch line length from the vertical centerline of the link and a vertical line intersecting the tangent line, is greater than or equal to 0.850; and b) a ratio of a distance from the pitch line to ends of the teeth to a product of the pitch distance and the tangent of the effective inner flank angle between a line tangent to the inner flank of the link at 0.25 times the pitch line from the vertical centerline of the link and a vertical line intersecting the tangent line, is greater than or equal to 1.4.