Abstract: Device for the assembly and movement control of a mobile element that moves with respect to a support between two extreme positions, characterized in that it includes an arm pivotable around a rotation axis which supports the mobile element; an elastic torsion rod aligned along the axis, secured respectively to the arm and to the support at axially offset points; two mechanical stops mounted on the support which determine two extreme angular configurations of the arm in which the element is in its extreme positions, the elastic torsion rod tending to bring the arm into a predetermined one of these configurations; two pairs of complementary magnetic latching elements mounted, respectively, on the support and on the arm, the complementary units of either pair being adapted to be opposite when the arm is in one or the other of the extreme configurations; and launching members mounted on the support designed to give a launching impetus to the arm from each to the other of the extreme configurations.

Abstract: Detector of angular position comprising a stator (1) and a toothed rotor (3) in relative rotation. The stator (1) has magnetoresistors (M1 through M8) in pairs and preferably numbering four or a multiple of four. The magnetoresistors in each pair are almost diametrically opposed and in electrical phase opposition to eliminate magnetic torques on the rotor (3). The use of at least two pairs allows a useful signal to be easily obtained for all angles if the signals of the pairs are out of phase at a 90.degree. electrical angle. The detector provides a very high degree of precision, strength and low energy consumption.