The cylinder (1) has a shaft (4) supported in a longitudinal hole (3) of a housing (2). A locking lug (6) is rotatable around a rotational axis (5). A coupling (8) is operated by a drive (7), and has a slider (9) movable from a decoupling position to a coupling position. The slider has a stop (10) that acts together with a stop surface (11) in the housing such that the slider is movable from the decoupling position to the coupled position relative to the housing and movement of the slider towards the coupling position is blocked during exceeding of preset speed and/or acceleration.
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