Pneumatic and hydraulic elevating seat tube assembly of bicycle
US10227101B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2017 |
| Grant date | Mar 12, 2019 |
| Priority date | — |
| Expiry date | Sep 10, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62J2001/085
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.