| 摘要 |
A chair oleopneumatic adjustable and amortized column support comprising: a first empty cylindric body (A), which basis is rigidly connected to the basement of the chair and a second cylindric body (B) as an upper coaxial slidable stem inside the first, which upper end is secured under the seat of the chair; a coaxial bar internal of command movable vertically (8) by command lever under the seat that protracts inside the second and the first body, associated to: first slidable piston means (5) into the first body and blocked externally to seal on the second body (B), that form two chambers respectively upper and lower chamber (X-Y), containing oil, with valve means (10) to allow or to prevent the passage of oil by one chamber to the other to the purposes to make possible the height variation by means of the actuation of said command under the seat; characterized in that: two second floating piston means are provided set between said first and second body, one above (6) and one under (4) said first piston means realizing a couple of oil chambers displace ensemble inside the first body (A). |
