Patent ID: 8968127
Filing Date: 2015-03-03
Classification: F16H

Abstract:
1. A tensioner comprising a tubular member on which multiple locking teeth are formed on an inner surface thereof, one or more locking pieces on an outer surface of which are formed locking teeth that engage with said tubular member's locking teeth; and a shaft, which is inside the tubular member and has a locking-piece receiving part or a locking-piece supporting part for receiving the locking pieces that are engaged with the tubular member, wherein either said tubular member or said shaft moves, as a moving member, reciprocally in relation to each other due to a biasing force, wherein a ratchet mechanism is provided in which said locking pieces move in a direction in which a diameter of said locking pieces is reduced so as to climb over the locking teeth of said tubular member so that said moving member can move forward, and said locking pieces move in a direction in which the diameter of said locking pieces is enlarged, so as to engage with the locking teeth of said tubular member so that said moving member is restrained from moving backward, and the locking-piece receiving part of said shaft is an inclined cam face that is (1) shaped so as to correspondingly fit slidably with an inclined cam face formed on the inner periphery of said locking pieces, and (2) formed so as to enlarge the diameter of said locking pieces in the direction in which said locking pieces engage with the locking teeth of said tubular member.