| 摘要 |
Automatic gear shifters or speed changers for bicycles and the like have been described which are intended to be responsive to speed changes as sensed by centrifugal weights or force changes as sensed by chain tension. It is necessary to prevent excessive shifting due to cyclic pedal positions, vibrational conditions, or shock loads. The subject, a force responsive automatic shifter, employs a hydraulic damping system to limit the rate of shifting, and in a simplified arrangement, the force is sensed indirectly from that portion of the rider's weight which rests on the saddle seat.
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