公开(公告)号：US20170197680A1

公开(公告)日：2017-07-13

申请号：US15418030

申请日：2017-01-27

Applicant: J. D COMPONENTS CO., LTD.

Inventor： Pin-Chieh FENG ,  Wen-Chia KUO

IPC: B62J1/08

CPC classification number: B62J1/08 ,  B60Y2400/406 ,  B60Y2400/408 ,  B62J2001/085

Abstract: A pneumatic and hydraulic elevating seat tube assembly of a bicycle includes an outer tube and a movable inner tube in the outer tube. An elevating adjustment unit in the movable inner tube has a fixed inner tube in the movable inner tube, a fixed piston in the fixed inner tube, a floating piston in the fixed inner tube, and an elastic isolator in the floating piston which is between a bottom end of the movable inner tube and the fixed piston so that a gas chamber is formed between the floating piston and the movable inner tube and a lower oil chamber is formed between the floating piston and the fixed piston. The elastic isolator has first and second annular grooves facing toward the lower oil chamber and the gas chamber respectively. The elastic isolator under pressure is extended radially, thereby effective in isolating oil from gas positively.