The invention relates to a security gate with a rotatable locking device rotatably a disk (2) with one of the number of panels corresponding number of first ratchet teeth (3) and between the first ratchet teeth (3) disposed second ratchet teeth (4), wherein fixed to the frame at least one pawl (6) is held, which cooperates with the ratchet teeth (3,4) such that the rotary locking device is freely rotatable only in a direction of passage and against the latter by the locking pawl (6) and the ratchet teeth (3,4) is blocked, wherein with the rotatable locking device comprises a cam disc (7) is rotationally fixedly connected, which has corresponding number of projections (8) and recesses (9) to the number of first and second ratchet teeth (3,4), and wherein fixed to the frame on a frame part (5) a mechanical tensioning device (10) with a resilient clamping member (11) is maintained, which at the projections (8) and recesses (9) having circumferential contour of the cam disc (7) is supported resiliently.
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