Abstract: An endless chain-belt assembly for engagement around a pulley or tooth sprocket includes an intermediate portion comprising a plurality of center links for engaging the sprocket, the links being connected by transfer of pins. An edge portion defining the opposed edges of the chain-belt assembly as a plurality of edge links defining a surface for engagement with surfaces of the pulley. Structures provided for removably attaching the edge links to the intermediate portion. A tensioning assembly for maintaining tension on the chain-belt assembly includes a first and second tensioning pulley, roller or sprocket for pivotal movement in the plane of rotation of the belt and bias and biasing structure for normally biasing the first idler pulley and the second idler pulley in engagement with the belt.

Abstract: A variable speed transmission (20) includes a sprocket (46) mounted on a first shaft (22) for rotation therewith. A variable effective diameter pulley (30) is mounted for rotation on a driven shaft (32). The pulley includes a pair of pulley halves (80, 82) having opposed inclined belt engaging surfaces (84, 86) and splines (90, 94) extending from the pulley halves. The splines are intermeshed so that the pulley halves may be drawn together or separated while rotating as a unit. A split shaft (130), including two half shafts (132, 134), extend within the pulley halves. Each half shaft engages one of the pulley halves such that as the half shafts are moved relative to one another, the pulley halves are moved one relative to the other. A pulley control mechanism (66) is provided for moving the halves of the split shaft simultaneously such that the center line of the pulley remains fixed as the pulley halves move together or apart.