| 摘要 |
<p>A telescopic extension ( 1 ) comprises an inner tube ( 2 ), an outer tube ( 3 ) and a sleeve ( 4 ) in which a constraining element ( 21 ) and a thrust slider ( 30 ) are movably supported; the constraining element ( 21 ) is capable of making integral 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 ) formed as one piece with the sleeve ( 4 ).</p> |
