Height adjustable seat posts for bicycles

Abstract

Height adjustable seat posts for bicycles are described herein. An example height adjustable seat post includes an upper tube and a lower tube configured in a telescopic arrangement and a piston in the upper tube. The piston divides the upper tube into first chamber and second chambers. The first and second chambers are filled with fluid. The height adjustable seat post also includes a valve including a fixed member and a rotatable member forming a face seal between a first face of the fixed member and a second face of the rotatable member. The fixed member has a fluid flow passageway. The rotatable member is rotatable relative to the fixed member between a closed position in which the rotatable member blocks the fluid flow passageway to prevent fluid flow between the first and second chambers and an open position to enable fluid flow through the fluid flow passageway and between the first and second chambers.

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