Patent ID: 7445195

Claim:
A pulley, comprising: a tensioning device which is the combination of a first shell and a second shell including a first compartment defined in a side of the interior of one of the first and second shells, a second compartment defined in the other side of the interior opposite to the first compartment, a first block pivotally connecting to the first shell and located in the first compartment, and a second block pivotally connecting to the second shell and located in the first compartment, with the first and second blocks connecting to each other; and a ratchet device disposed in the tensioning device and including a ratchet, a first gripping element, a second gripping element and an actuating element pivotally installed in the second compartment, with the ratchet and the first and second gripping elements mounted onto the first block in sequence; wherein the actuating element includes a first restrict portion formed thereon and projecting downward therefrom between the first and second gripping elements and a second restrict portion protruding therefrom and adapted to block the ratchet.