| 摘要 |
A telescopic extension (1) comprises an inner tube (2), an outer tube (3) an d a sleeve (4) in which a constraining element (21) and a thrust slider (30) a re movably supported; the constraining element (21) is capable of making integr al the inner tube (2) and the outer tube (3) and the thrust slider (30) is connected to an actuating element (40) and is engaged with the constraining element (21) under the action of a spring (31); the constraining element (21 ) consists of a projection of an elastic tongue (16) having one end (19) forme d as one piece with the sleeve (4). (Fig.1)
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