| 摘要 |
The stay comprises an external support-tube (1) in which can axially slide over a certain length a height-adjusting screw (3), axially actuated by a rotating nut (6a, 6b). To prevent said screw (3) from rotating when the nut (6a, 6b) rotates and from accidentally coming apart when the whole assembly is being manipulated, said screw (3) is made angularly integral with the external tube (1) by means (19a, 20a; 19b, 20b) which also prevent the screw (3) from having a too long and unwanted travel. Thus the screw cannot rotate when the nut (6a, 6b) is actuated while the external tube (1) is manually blocked and the screw (3) cannot accidentally come out of the external tube (1) when the whole assembly is manipulated.
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