Patent ID: 9567027
Date: 2017-02-14
CPC Classifications: B62J

Claim:
1. A bicycle seat post height adjustment mechanism, which is fixed inside a seat post, comprising: an outer tube fastened to said seat post and having an upper opening and a lower opening respectively provided with a plug; an inner tube fixed to an interior of said outer tube, wherein the interior is partitioned into a lower oil chamber and an upper oil chamber; wherein said lower oil chamber and said upper oil chamber communicate with each other via a lower valve port, and wherein an upper valve port is arranged in a middle of an interior of said upper oil chamber; a pin inserted into said upper oil chamber of said inner tube; a lower valve packing ring corresponding to said lower valve port; an upper valve packing ring corresponding to said upper valve port; a first spring pushing said pin upwards to allow said lower valve packing ring to block said lower valve port in a normal mode; wherein said pin is pushed to compress said first spring to axially move to manage said upper and lower valve ports to open or close based on an other mode; an upper floating piston inserted between the inner tube and the outer tube and disposed on top of said spring fixture element, wherein a bottom end of the upper floating piston communicates with said upper oil chamber through an upper through-hole arranged on top of said upper valve port of said inner tube; an air chamber arranged between said inner tube and said outer tube, wherein said air chamber is on top of said upper floating piston.