| 摘要 |
System in which the rotational shaft 4 is pinched by a tubular element in the form of a small pipe 7, with which it rotates jointly when the small pipe 7 rests via its ends on bearings 10 inside the ferrules 3. The small pipe 7 is provided with apertures 8 which between them define small internally thickened partitions 9 for producing pinching of the small pipe 7 on the rotational shaft 4. <IMAGE>
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