| 摘要 |
A gas spring having a cylindrical housing has multiple regions through which a piston moves. A piston rod extends through one end of the cylindrical housing. One region is pressurized with an inert gas and at least a second region includes a multiple viscosity fluid, such that, as the piston moves under the influence of the pressurized gas, the piston rod moves at a variable speed. In one embodiment, the second region includes two layers of different viscosity oils with the oil adjacent the piston, having a lower viscosity and density than the second layer of oil. In other embodiments, the second region has a substantially continuously varying viscosity fluid.
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