| 摘要 |
A replacement unit for a conventional bicycle which can be installed without modifying the bicycle requires the original seat and seat shaft to be taken out of the bicycle frame and replaced by the replacement unit. This unit comprises a tube which fits inside the vertical tubular bicycle frame. Inside the tube is a coil spring and a shaft. The coil spring is compressed by the weight of the shaft, and the weight rider sitting on the seat. When the rider places his weight on the pedals, the spring inside the tube lifts the seat. A plurality of stop members are disposed along the shaft and a pin is positioned to engage the stop member to lock the seat at the correct height above the frame, depending on the needs of the driver.
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