Abstract: An arrangement whereby the resisting force tending to oppose the shifting of a lever is roughly constant, irrespective of the direction in which the lever is shifted. For this purpose, the lever 1 is roughly freely rotatively mounted on its support 4 and an intermediate ring 7 is provided and frictionally mounted relative to the support, the lever 1 defining a cavity 18 which opens onto the outer surface of the ring 7 and in which is received an element 19 for achieving a coupling between the lever and the ring. The cavity defines a cam surface which is so oriented as to achieve a unidirectional coupling by a wedging of the coupling element between the lever and the ring.

Abstract: The detecting device comprises an L-shaped support bracket 1 having a branch 2 on which is rotatively mounted a disc 4 engaged with the rotary element and a second branch 3 which carries a member constituting a bearing for a motion take-off head 19 of a transmission cable 20 or the like. Counter transmission and speed changing means 8 are provided between the disc 4 and the motion take-off head 19. The support 1 and the member 16 constituting a bearing are adapted to be capable of occupying a plurality of different relative positions. A set of counter transmission speed changing means corresponding to the various relative positions of the support and the member constituting a bearing is provided. In this way this detecting device is very easily adaptable to wheels having different diameters.