Lifting telescoping tube
US4832318A · kind A · utility
10Cited by
15References
3Claims
0Family size
Inventor
Key dates
| Filing date | Mar 10, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Mar 10, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/063
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention discloses a lifting telescoping tube which comprises a first tube receiving a pressure liquid, a second tube filled with a pressure gas, a first piston affixed to one open end of the second tube having a first through-passage and a second through-passage intercommunicating the first and second tubes, a check valve disposed in the second through-passage for preventing the pressure liquid from flowing into the first tube from the second tube, a second piston provided in the second tube dividing the second tube into a variable-volume liquid chamber and a variable-volume gas chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.