| 摘要 |
A bolt on chain tensioner (46) for adjusting the tension in a bicycle chain (54) which includes a tensioner bolt (78), a boss (76) with a threaded bore (80), a lock nut (82), and an axle nut (84). A bicycle has two drop outs (44), one on either side of the rear wheel, each drop out (44) defining a slot (48) to receive the rear axle (114). Each end of the rear axle is held in place in the drop out by a tightened axle nut (84). The boss (76) of the present invention is mounted adjacent to the drop out slot (48). A tensioner bolt (78) is positioned through the bore in the boss so that it engages the axle nut (84). The tensioner bolt having received a lock nut (82) for securing the bolt's position relative to the boss. A first embodiment of the axle nut (84) includes a hexagonal top portion (102) fixed to a smaller cylindrical bottom portion. A second embodiment includes a hexagonal top portion (130) rotationally attached to a larger cylindrical bottom portion (132).
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