| 摘要 |
In a method of manufacturing a sliding face in a plastic guide bushing for a height-adjustable chair column, the inner face of the guide bushing is provided with surfaces which are undersized with respect to a pneumatic spring housing to be guided. Between the individual surfaces there are offsets which are oversized with respect to the housing of the pneumatic spring to be guided. Between the offsets, part-cylindrical areas are cleared in the surfaces by broaching, these areas together representing a sliding face. These measures make it possible to perform satisfactory broaching of the sliding face with high surface quality and dimensional accuracy. In addition, the remaining offsets, which may take the form of grooves of any cross-section, can be used as reservoirs for lubricating grease. …<IMAGE>… |
