| 摘要 |
An improved bicycle lever transmission assembly, which may be in kit form, is provided for installation on a conventional bicycle having a pedal crankshaft with a journalled portion rotatably mounted in a bicycle frame having a pair of pedal cranks extending oppositely from the journalled portion. The lever transmission assembly or kit includes a pedal crank with a pivot boss extending therefrom in spaced parallel relation with the journalled crankshaft portion, a drive sprocket to mesh with a drive chain to drive a bicycle wheel, the drive sprocket being rotatably mounted on the crankshaft journalled portion adjacent a pedal crank, a fixed lever link affixed to the drive sprocket with an end portion thereof extending beyond the pitch diameter of the fixed lever link, and leverage transmission components including at least one lever link pivotally connected with the pivot boss and with the extending end portion of the fixed lever. The lever transmission components may include a second lever link having first and second end portions respectively pivotally connected to the drive sprocket and to the first lever link, and a third lever link having first and second end portions adapted respectively for connection to the extending end portion of the fixed lever link and to an intermediate portion of the second lever link.
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