Chain saw nose sprocket

In combination, a nose sprocket and a saw chain extending therearound;

• the saw chain including side links and drive links, the drive links defining a chain pitch;
• the sprocket comprising a plurality of teeth spaced circumferentially apart by gullets;
• each tooth including first and second edges facing in mutually opposite circumferential directions, wherein leading and trailing sides of each gullet are formed respectively by the first edge of one tooth and the second edge of another tooth;
• at least one of the first and second edges of each tooth including radially inner and outer portions adapted to make contact with a drive link of a saw chain, wherein the inner portion being straight and deviating from a radius of the sprocket;
• the outer portion deviating from that radius by a greater amount than the inner portion, the teeth defining a sprocket pitch which is longer than the chain pitch.

In combination, a nose sprocket and a saw chain extending therearound;

• the saw chain comprising side links and drive links;
• the drive links including respective drive tangs;
• each drive tang having leading and trailing edges;
• the drive links defining a chain pitch so small that only one drive tang at a time is supported on both of its leading and trailing edges by the nose sprocket, with all drive tangs disposed on the nose sprocket behind the one sprocket being engaged only at their respective leading edges with the nose sprocket, the nose sprocket comprising a plurality of teeth, each tooth having leading and trailing edges, each of the leading and trailing tooth edges including radially inner and outer portions, the inner portion being straight and deviating from a radius of the sprocket;
• the outer portion deviating from that radius by a greater amount than the inner portion.