| 摘要 |
A drive sprocket arrangement includes a drive sprocket and a drive ring rolling loosely on the outer periphery of the sprocket. Drive links of the saw chain enter recesses in the sprocket via orifices in the drive ring. The drive ring has at an axial inner edge thereof a radially inwardly directed flange to retain the ring on the sprocket, and at an axial outer edge thereof a radially outwardly directed flange to retain the chain in place. The flanges are arranged such that the axial inner edge will be disposed above the axial outer edge when the drive shaft of the chain saw points downwardly. |
