| 摘要 |
In the central rotating shaft of a rack for a tissue scroll an inner sleeve passes through a cover ring, and a spring is placed at an opening end of the inner sleeve; then the opening end of the inner sleeve and the spring are received in an opening end of a outer sleeve, and finally, the cover ring is engaged with the opening end of the outer sleeve such that the inner sleeve can be retractable between the outer sleeve and the cover ring by the force of the spring.
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