| 摘要 |
-9 The invention relates to a telescopic actuator comprising a cylinder (1) in which a main rod (2) is mounted to slide telescopically along a sliding axis (X) 5 between a retracted position and an extended position, the telescopic actuator including an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position, the actuator including controlled retaining means (30, 31, 32, 33) for retaining the auxiliary rod in the retracted position inside the main rod, the actuator further including brake means 10 for braking sliding of the auxiliary rod in the main rod in the extension direction. According to the invention, the auxiliary rod (20) has a thread (101) on an outside surface, the main rod (2) carrying at its end a rotary bearing (102) that centers the auxiliary rod inside the main rod and that co-operates via a reversible helical connection with the thread of the auxiliary rod such that extension of the auxiliary 15 rod causes the rotary bearing to rotate, the brake means (106, 110) being arranged to brake rotation of the rotary bearing during extension of the auxiliary rod. 09/04/09,va 17884 speci,9 |
