The invention relates to a gate-type barrier (1) provided with one or more contention beams (9) capable of being pivotally locked by activatable / deactivatable locking means (12), comprising locking tabs (13). ) mounted on a lock control bar (14); the locking control bar (14) is pivotally mounted about its longitudinal axis (15) and is provided with operating means (17) to rotate it about said longitudinal axis (15) so as to activate or deactivate According to the invention, said operating means (17) comprise a toothed wheel (18) integral with said locking control bar (14) and centered on said longitudinal axis (15), which toothed wheel (18) cooperates with a right toothed rack (19) (191) actuated by the rod (201) of a control cylinder (20).
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