Abstract: The invention proposes a device for adjusting the length of a wristband or bracelet including a base plate and an adjusting link, the adjusting link being hinged on the base plate via at least one connecting rod which is hinged on the base plate via a main pin which is hinged on the adjusting link via a secondary pin, wherein the adjusting link is arranged so as to slide relative to the base plate, including a locking device allowing the adjusting link to catch on an anchoring element arranged on the base plate in at least two indexed longitudinal positions, respectively defining two lengths of the bracelet, characterized in that the anchoring element is arranged on the main pin. The invention also proposes a bracelet fitted with this adjustment device and a watch fitted with such a bracelet.

Abstract: The invention proposes a device for adjusting the length of a wristband or bracelet including a base plate and an adjusting link, the adjusting link being hinged on the base plate via at least one connecting rod which is hinged on the base plate via a main pin which is hinged on the adjusting link via a secondary pin, wherein the adjusting link is arranged so as to slide relative to the base plate, including a locking device allowing the adjusting link to catch on an anchoring element arranged on the base plate in at least two indexed longitudinal positions, respectively defining two lengths of the bracelet, characterized in that the anchoring element is arranged on the main pin. The invention also proposes a bracelet fitted with this adjustment device and a watch fitted with such a bracelet.

Abstract: The invention concerns a method for welding hinge pins onto links each formed of one or more elements, the links being connected to each other by means of said hinge pins arranged in passages provided for this purpose in the links, each pin being fixed onto one of the links and hinged onto the next link, characterised in that the connection of the pin to the link is made via an arc welding operation with the aid of an electrode in an inert atmosphere without using a solder.

Abstract: The watertight push button device is intended for example to equip a timepiece, in particular for controlling said timepiece. It comprises a body (2) inside which a cavity (4) of generally oblong shape is arranged, and a push button stem (6) arranged inside the cavity (4) and capable of moving, inside the latter, by a sliding movement when its head (8) is pushed.In order to prevent a shock at the end of the travel and/or an accidental activation of the push button, the device comprises pneumatic means intended to dampen the sliding movement of the stem (6) inside the body (2). These pneumatic means comprise an annular chamber defined around the stem (6) by a fixed gasket (28) and one of the sealing gaskets (20,22) mounted on the stem. Leakage means are preferably provided between the fixed gasket and the stem or the body.

Abstract: An annular packing (30) has a cross-section in the form of a dumbbell including two enlargements (31, 32) connected by a neck (33). In a preferred embodiment the enlargements exhibit a polygonal cross-section. The packing advantageously replaces an O-ring seal in which the interior diameter of the ring is large relative to the diameter of the cross-section of the ring. The packing is arranged between two parts driven at different speeds, in precision mechanisms or in horology.

Abstract: An annular packing (30) has a cross-section in the form of a dumbbell including two enlargements (31, 32) connected by a neck (33). In a preferred embodiment the enlargements exhibit a polygonal cross-section. The packing advantageously replaces an O-ring seal in which the interior diameter of the ring is large relative to the diameter of the cross-section of the ring. The packing is arranged between two parts driven at different speeds, in precision mechanisms or in horology.