| 摘要 |
The invention pertains to an object support post with a vertical tube, which has a support plate at one end and a guide bush at the other end, in which a pneumatic spring is guided with freedom to slide back and forth. The pneumatic spring has a pressure cylinder, the interior of which is filled with a pressurized gas, where the interior is divided by a sliding piston into a first working chamber and a second working chamber, which chambers can be connected to each other by a bypass, which can be opened by a manually actuated valve. The piston has a piston rod, which extends through the second working chamber and is guided out of the pressure cylinder through a seal, the free end of the rod being attached to the support plate. A first stop ring, which, when the piston rod is in its outwardly extended position, encloses the area where the piston rod leaves the pressure cylinder, is connected permanently to the vertical tube and has a first, axially oriented, helical stop surface on one side. At the exit area of the piston rod, a stop is permanently connected to the pressure cylinder, where the stop rests axially against the first stop surface in the final phase of the outward travel of the piston rod.
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