Patent ID: 6065246
Filing Date: 2000-05-23
Classification: E06B

Abstract:
A device for driving a revolving tripod of a two-way turnstile, characterized in that said device includes a wheel (1), having a periphery, keyed onto a shaft (2) together with a cam (3) and said tripod, a positioning mechanism engaging said cam (3) and suitable to cause a rotation thereof upto one of three stop positions 120.degree. apart, and two specular mechanisms for locking said wheel (1) symmetrically arranged with respect thereto and each one including a locking member suitable to engage the periphery of the wheel (1) and an actuator suitable to take said locking member towards and away from said periphery, the wheel (1) being substantially shaped as an equilateral triangle with convex sides having a peripheral profile including a series of teeth and steps with straight flanks and different heights, among which a tooth (14) having the greatest height is found every 120.degree. at the three vertices of the triangle and is followed in both directions of rotation by a plurality of steps (15a, 15b, 15c) of decreasing height, and three intermediate teeth (16) are found at 60.degree. apart from said vertex teeth (14), the ends of the two locking members being positioned at two intermediate teeth (16) when the cam (3) is in one of its stop positions.