| 摘要 |
An adjustable support foot comprises a support post, a plurality of retaining plates, a control device and an outer shell. The support post has a base and a screwed axle erected thereon. The retaining plates each provided with a screw thread cover around the screwed axle and are further enclosed by the control device including a retaining cylinder and a control ring. The control device urges the retaining plates to engage the screwed axle or depart from the screwed axle, by which the relative position of the support post in the outer shell can be quickly or mildly changed.
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