Abstract: Watch movement in which the rotor of a generator (10, 11, 13) is driven by a spring over a plurality of wheels (51, 61, 71) and pinions (50, 60, 70), the operation of the generator being regulated by an electronic regulating circuit (81). Said wheels and pinions are all electrically grounded to avoid spark discharges which can be produced by the charging of voltages through frictional electricity.

Abstract: A device for assembling two mechanical pieces, of which the first one (3) carries a skirt (14), which, in the assembled position, extends into a cavity of the second piece (1), by means of an elastic segment (5), is characterised by the fact that the elastic segment (5) is made of a material exhibiting a shape memory. This segment (5) can assume two different shapes, depending upon its temperature. This elastic segment (5) has an external peripheral part which is circular and which is engaged into a circular groove (4) provided on the second piece (1), this circular groove (4) being located in a plane which is perpendicular to the axis of the cavity of this second piece (1); this elastic segment (5) carries, on its inner periphery, protrusions (7) which, in a first state of the segment (5) are situated in the plane of the external peripheral part of the segment (5) and, in a second state of the segment (5), protrude out of this plane.

Abstract: An expansible closure for a bracelet includes a central portion articulated at at least one of its ends to at least one arm located beside the central portion and adjacent to the central portion in a closed position. The at least one arm includes at least one pin having a locking member that emerges in a rest position under an action of a spring from outside a recess in a lateral section of the at least one arm. The central portion includes a locking device having a pusher, and at least one recess provided in a medial section of the central portion adapted to receive the locking member. The medial section of the central portion includes a notch, in a shape of an inclined plane coacting with the locking member during closing of the closure. In a completely closed position, the locking member extends, under the action of the spring, within the recess of the central portion.

Abstract: The folding clasp for an interchangeable watch strap comprises at least two arms articulated together and foldable against each other, provided with a fixing device to hold the clasp in closed position. The free end of one (1) of the arms (1, 3) is provided with a securement device for the end of a strap tongue (11) comprising a guide (8) having in cross-section a general U shape, an axle (9) connecting the two lateral wings of the guide (8) and holding members (10) adapted to coact with the upper surface of the tongue (11) of the strap. The free end of the other arm (3) of the clasp is pivoted on a cover (14) with the help of a screw (12), this cover (14) having lateral portions (13) interconnected by an axle (15). The cover (14) of the clasp comprises retaining members (16) adapted to coact with the upper surface of a second tongue (17) of the strap.