Abstract: A barrier device for controlling a passage for pedestrians, the device being of the three-legged turnstile type comprising a rotary hub whose axis is inclined at about 45.degree. relative to the vertical, and which has three legs fixed thereto that successively take up position across said passage on each rotation through one-third of a turn each time a pedestrian passes through, the bottom edge of a leg in its passage-barring position substantially constituting a horizontal straight line, wherein each leg, when seen in its passage-barring position, occupies a substantially vertical plane over a height that lies in the range 150 mm to 300 mm, at least towards the middle of the leg.

Abstract: Two-way pedestrian access control system comprising a passageway laterally bounded by two pillars, said passageway being normally barred by a barrier locked in close position which can be opened upon validation by a system for recognizing individuals or passes, said barrier comprising a turnstile mounted to one of the pillars and consisting of three arms assembled in conformance with the edges of a regular trihedron and having an axis of rotation confounded with the ternary axis of symmetry of the said turnstile, said axis of rotation being so directed that the turnstile's rotation by 2/3.pi. about said axis always places an arm in horizontal position, barring the passageway, wherein said barrier further comprises a swinging gate, hinged about a vertical axis lying in the vertical plane containing the said rotational axis of the turnstile, said gate having a cutout enabling passage therethrough of the arms of the turnstile and being high enough to prevent from passing an individual of average size.