The device of the changes of speed, before the cycles with stirrup wide and third flange, a reciprocating control

摘要

The invention relates to a device for changing front gears of cycles and similar vehicles comprising a calliper mounted on a parallelogram, the spread of which is very substantially greater than the normal spread, and, on the other hand, a third flange or equivalent member for thrusting on the chain, mounted so as to move with respect to the calliper and articulated via a pin 16, a spring 14 keeping it away from the calliper 1, bearing surfaces 3a and 2a are made respectively on an arm 3 of the parallelogram and on the third flange 2, these bearing surfaces being arranged so as to receive an alternating thrust of the control system, actuated by a cable with the aid of a frictionless manipulation member which can be actuated manually by pulses. The alternating movement control system comprises: - a receiving member 4 which can move according to at least one axis, actuated in one direction, and returned to the rest position by a return means 11, - one or more tilting so-called memory members 7, pivoting about an axis 24, driven directly or indirectly by the receiving member, - one or more intermediate tilting members 9, such as an index, fixed or semi-movable stops making it possible to tilt the so-called memory member under the action of the receiving member 4, - means 8 for keeping the memory member 7 in each of the positions. IMAGE