| 摘要 |
The invention provides a telescopic member having an inner cylinder slidably fitted into an outer cylinder in the axial direction and a lock mechanism, placed between the cylinders, for holding relative movements therebetween. A holder is secured to the outer cylinder and allows its inner circumferential surface to slide on the outer circumferential surface of the inner cylinder so that a frictional force is applied to the relative movements between the cylinders. The holder has a braking chamber on the side facing the inner cylinder to contain a friction body that rolls on the circumferential surface of the inner cylinder. The braking chamber has a taper surface so as to have a space that becomes narrower in the push-in direction of the inner cylinder, and first and second moving end surfaces that are separated with a predetermined distance in the push-in direction so as to intersect the taper surface, and is formed into a reversed trapezoidal shape in its cross-section viewed at one side. Therefore, it is possible to provide a stable frictional force against the movement of the inner cylinder in the push-in direction.
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