| 摘要 |
The wheelchair employs the use of two push levers (20) attached to two front drive sprockets (13), which propel the two main rear wheels (2) of the wheelchair through chains (11) connecting the front sprockets to gear clusters (9) mounted on the rear wheel axles. Ratchet mechanisms (18) allow each push lever to transmit power to the drive sprockets in either a forward or reverse direction. Derailers (10) are mounted at each rear axle and are activated by shifter mechanisms mounted on the push levers. Caliper wheel brakes (23) are mounted on the frame beside each rear wheel and activated by hand brake levers (25) mounted on the push levers.
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