| 摘要 |
A gas cylinder for applications requiring height adjustments such as found in chairs, stools, or like structures supported by columns. The cylinder has an elongated rechargeable unit of double-wall construction provided with a springless check valve inside a fluid port thereof preferably all of molded plastic. A single-piece sealed plunger assembly includes a single actuating rod with velocity controls incorporated therein which permit vertical extension from collapsed to fully-extended positions. Depression of the actuating rod allows circulation of the pressurized fluid between the chambers, with pressure force acting to extend the plunger when the unit is unloaded. When the unit is loaded, the plunger can be retracted.
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