| 摘要 |
A seat post is disclosed. The seat post includes a pneumatic cylinder, a hollow pneumatic piston, a gap, a seal, a hydraulic cylinder, a hollow hydraulic piston, and a valve. The gap exists between the pneumatic cylinder and the pneumatic piston and communicates with the inside of the pneumatic piston. The seal is disposed at the pneumatic cylinder for sealing the gap. The hydraulic cylinder is disposed in the pneumatic piston and communicates with the inside of the pneumatic piston. One end of the hydraulic piston passes through pneumatic piston and is inserted into the hydraulic cylinder. The other end is disposed in the pneumatic cylinder and communicates with the inside of the pneumatic cylinder. The valve connects the pneumatic piston and the hydraulic cylinder for opening or closing the communication between the pneumatic piston and the hydraulic cylinder.
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