| 摘要 |
The locking unit has an extensible strut comprising telescopic shaft and housing parts which can be locked against relative axial movement by a collet type clutch comprising a plurality of axially movable wedge elements. These elements are spring biassed into wedging locking engagement between the strut parts but can be displaced axially, to free the parts by a piston projecting from a chamber formed in the housing part. A resilient device protects the strut against overload due to compressive forces.
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