| 摘要 |
A flange with notches (5) is attached to the cylinder of the lifting pillar support element. Moreover, several projections with contact faces are made on the inner face of the cylinder with equal sepn. along its length so that the fiftin pillar for moving the ring rail is supported by the contect faces. The ratio of the width of the contact face and the width of the groove formed between the projections is 1:1-4. The support element is composed of polyamide or polyethylene resin.
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