The invention is directed to an anti-amok cylinder comprising an inner grip (7) and an outer grip (7) wherein the inner grip (7) is connected to a closing lug (2) and a coupling device (3, 5, 12) is provided which is designed for connecting the outer grip (4) to the closing lug (2) when a closing authorization is present, wherein the inner knob (7) and the closing lug (2) are connected by means of a coupling (5, 8, 9) which is designed for separating the connection of the inner knob (7) and the closing lug (2) when the closing authorization is present and for reaching a torque acting from the outer grip (7) onto the closing lug (2) and wherein the coupling (5, 8, 9) is a locking member coupling (5, 8, 9).
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