Abstract: A tensioning device (10) for a flexible drive element (16), the tensioning device comprising a first tensioning member (40) having a first contact surface (58), and a second tensioning member (140) having a second contact surface (158). Straps (34, 36) and positioning devices (42, 44, 142, 144) secure the first and second tensioning members a selected distance away from one another. In one arrangement, the positioning devices form a ratchet-like mechanism arranged such that the force required to move the tensioning members toward one another is smaller than the force required to move the tensioning members away from one another. The tensioning device may be operated without any members securing the tensioning device with respect to the sprockets.

Abstract: A tensioning device (10) for a flexible drive element (16), the tensioning device comprising a first tensioning member (40) shaped to form a channel (52) having a first contact surface (58), and a second tensioning member (140) shaped to form a channel (152) having a second contact surface (158). Straps (34, 36) and engagement means (42, 44, 142, 144) secure the first and second tensioning members a selected distance away from one another by means of a ratchet-like mechanism arranged such that the force required to move the tensioning members toward one another is smaller than the force required to move the tensioning members away from one another. The tensioning device may be operated without any means securing the tensioning device with respect to the sprockets. Grooves (60, 160) are provided in the respective channels to maintain the sides of the flexible drive element out of contact with the channel sides.