| 摘要 |
A drive system (3) for a human powered vehicle. The drive system (3) includes at least one input member (31), a transmission system (21) arranged to convert movement of the input member (31) to rotation of an output member (83), and a lock mechanism (123) including at least one drive member (133) for selectively locking a drive wheel (11, 13) to rotation of the output member (83) for rotation therewith. The drive member (133) is arranged for movement from a first operational position in which the drive wheel (11, 13) is not locked to the output member (83) to a second operational position in which the drive wheel (11, 13) is locked to the output member (83), and back to the first operational position, under the control of a user of the vehicle. The drive system (3) allows the user to choose between propelling the vehicle using the drive system (3) or disengaging the drive system (3) from the drive wheel (11, 13) and propelling the vehicle by some other means, for example by wheel rims.
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