| 摘要 |
A locking device for a movement unit supported displaceably relative to and along a longitudinal axis of at least one guide rod, comprises a pair of clamping members which have each a clamping opening. Each clamping opening has an inner surface for receiving the guide rod. Each clamping member has a foot end and a head end and is pivotable about an axis to assume a first position, in which the inner surface is in frictional braking contact with the guide rod, and a second position for allowing free relative movement of the clamping members and the guide rod. The pair of clamping members has also a corresponding pair of control surfaces facing each other at their head ends. There is an actuation device that acts onto the pair of clamping members to move them from one of their positions to the other. This actuation device includes: a device for imparting movement which has a pressure exerting surface for exerting pressure in a direction towards the clamping members. Furthermore, there is a wedge-like actuator formed by at least one body of revolution, separated from the pressure exerting surface, and being displaceable transversely to the direction towards the clamping members. The actuator is pressed by the pressure exerting surface to engage the control surfaces of the clamping members in order to pivot them into one of their positions, while rolling over the pressure exerting surface.
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