| 摘要 |
A vertically adjustable suspension support unit having a vertical cylinder and a brake element slidable in the cylinder. The brake element comprises a pair of collars located coaxially in the cylinder with opposed bevels providing a raceway for spherical bearings, the angle of each bevel being between 35 DEG and 70 DEG , preferably 45 DEG , with respect to a transverse plane of the cylinder normal to its axis. The collars are connected to a grip and are movable towards and away from one another to clamp or release the brake element in the cylinder, the brake element being axially rotatable while clamped.
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