Abstract: A variable vacuum capacitor is described in which oil inside the main bellows (21) is pumped through the bellows and through the oil circuit (8) of a heat exchanger by a pump (15). Water passes through coolant channels (6) of the heat exchanger, from inlet (7) to outlet (7?). The extendable capacitor drive shaft (14) is hollow and serves as a conduit, conveying the oil to the bottom of the (bellows 21), thereby ensuring a full circulation of the oil right through the bellows and then through the heat exchanger. Pump drive means (9) may be a gerotor hydraulic motor, coupled to a gerotor oil pump (15) via magnetic coupling (22). Pumping heat transfer fluid (oil) through the bellows allows the capacitor to operate at significantly higher currents and/or lower temperatures, and significantly extends the life of the device.

Abstract: A variable vacuum capacitor is described in which oil inside the main bellows (21) is pumped through the bellows and through the oil circuit (8) of a heat exchanger by a pump (15). Water passes through coolant channels (6) of the heat exchanger, from inlet (7) to outlet (7?). The extendable capacitor drive shaft (14) is hollow and serves as a conduit, conveying the oil to the bottom of the (bellows 21), thereby ensuring a full circulation of the oil right through the bellows and then through the heat exchanger. Pump drive means (9) may be a gerotor hydraulic motor, coupled to a gerotor oil pump (15) via magnetic coupling (22). Pumping heat transfer fluid (oil) through the bellows allows the capacitor to operate at significantly higher currents and/or lower temperatures, and significantly extends the life of the device.

Abstract: A device for attachment of a timepiece movement to a watch case, including a peripheral attachment element of the movement positioned in abutment on an axial bearing surface of the case. The device includes thermoformed studs integral with the case having a mushroom shape at an end thereof providing an axial retaining surface acting as a rivet to hold the peripheral attachment element of the movement against the axial bearing surface of the case.

Abstract: A watch case includes a case middle made of plastic or electroformed material and a crystal. The crystal or the case middle includes elbowed catches that are each insertable in a bayonet fitting in a recess of the case middle or the crystal. The case also includes a rotation stop angularly securing the case middle and the crystal in an angular position such that a part of each catch is frontally locked behind a holding surface of the case middle or of the crystal. The rotation stop is frontally snap-fitted on the case middle and/or the crystal by snap-fit fingers that cooperate with a complementary stop surface of the case middle and/or of the crystal.

Abstract: Timepiece movement including a date display drive device formed of a display disc including a toothing, said drive device including driving means and a drive source. The driving means includes a wheel set including pins, having a toothed wheel and a pinion including pins, and an engaging wheel engaging said toothed wheel. The pinion with pins includes a pair of pins configured to be positioned on either side of any tooth of the toothing. The toothed wheel of the pin wheel and the engaging wheel respectively have complementary non-circular profiles. When the two pins are oriented in a tangential direction to the toothing, these two wheels have a first gear ratio that is lower than a second gear ratio between them when the two pins are in perpendicular alignment to said tangential direction.

Abstract: Timepiece movement including a date display drive device formed of a display disc including a toothing, said drive device including driving means and a drive source. The driving means includes a wheel set including pins, having a toothed wheel and a pinion including pins, and an engaging wheel engaging said toothed wheel. The pinion with pins includes a pair of pins configured to be positioned on either side of any tooth of the toothing. The toothed wheel of the pin wheel and the engaging wheel respectively have complementary non-circular profiles. When the two pins are oriented in a tangential direction to the toothing, these two wheels have a first gear ratio that is lower than a second gear ratio between them when the two pins are in perpendicular alignment to said tangential direction.

Abstract: Watch case (1) comprising a case middle (2) made of plastic or electroformed material and a crystal (3), the crystal (3) or the case middle (2) comprises elbowed catches (4), each insertable in a bayonet fitting in a recess (5) of the case middle (2) or the crystal (3), and the case (1) includes a rotation stop means (6) angularly securing the case middle (2) and the crystal (3) in an angular position wherein a part of each catch (4) is frontally locked behind a holding surface of the case middle (2) or of the crystal (3), this rotation stop means (6) is frontally snap-fitted on the case middle (2) and/or the crystal (3) by snap-fit fingers (61) which are comprised therein and which cooperate with a complementary stop surface, of the case middle (2) and/or of the crystal (3).

Abstract: A device for attachment of a timepiece movement to a watch case, including a peripheral attachment element of the movement positioned in abutment on an axial bearing surface of the case. The device includes thermoformed studs integral with the case having a mushroom shape at an end thereof providing an axial retaining surface acting as a rivet to hold the peripheral attachment element of the movement against the axial bearing surface of the case.

Abstract: Device for fastening a bracelet strand to a case of a watch. The device includes at least one fastening element allowing this bracelet strand to be detached from this case when this fastening element is subjected to a predetermined force or moment. Wristwatch including a case and at least one bracelet strand pivotally hinged about a shoulder of a pin forming such a device. This pin is a sacrificial pin which includes, on this shoulder, at least one area of mechanical resistance lower than the lowest mechanical resistance of this case and than the lowest mechanical resistance of this bracelet strand.

Abstract: A timepiece movement including a time-setting stem which is moveable longitudinally and in rotation along a stem axis in a bottom plate, the movement including at least one display control mechanism which includes at least one counter, an arbour of which pivots about a pivot axis. The axis is secant with the stem axis, and pivots in a first jewel, a first external shoulder of which is driven into the bottom plate, and a second external shoulder of which pivotally guides the bore of an intermediate time-setting wheel controllable via the stem.

Abstract: A timepiece assembly including centring pins integral with a bottom plate, each arranged to cooperate with radial and tangential play with an oblong groove in a dial, for the relative positioning of the dial with respect to the bottom plate, and a holding means integral with the bottom plate, arranged to cooperate with a complementary holding device integral with the dial, the holding device and/or complementary holding device including an elastic return device for pressing the dial resting onto the bottom plate. The elastic return device has tangential mobility in a plane perpendicular to the plane of the bottom plate and to a radial line connecting the center of the bottom plate to the elastic return device.

Abstract: Method of fastening a glass to a watch bezel, wherein the glass has a plurality of studs or a plurality of holes or a plurality of studs and holes and the bezel has a plurality of studs or a plurality of holes or a plurality of studs and holes. The method is characterized in that it comprises a step of pressing the studs into the holes.

Abstract: A timepiece including a case including a middle part, which is closed on the top portion thereof by a bezel and on the bottom portion by a back cover, and a timepiece movement mounted against the middle part by a casing ring. The timepiece also includes a locking device for pressing the assembly including the timepiece movement and casing ring against the middle part when the case of the timepiece is closed.

Abstract: Timepiece movement (100) comprising a time-setting stem (2) which is moveable longitudinally and in rotation along a stem axis (T) in a bottom plate (3), said movement (100) comprising at least one display control mechanism (200) which includes at least one counter (1), an arbour (4) of which pivots about a pivot axis (D). Said axis (4) is secant with said stem axis (T), and pivots in a first jewel (6), a first external shoulder (61) of which is driven into said bottom plate (3), and a second external shoulder (62) of which pivotally guides the bore (71) of an intermediate time-setting wheel (7) controllable via said stem (2).

Abstract: Timepiece assembly (100) comprising centring pins (3) integral with a bottom plate (1), each arranged to cooperate with radial and tangential play with an oblong groove (4) in a dial (2), for the relative positioning of said dial with respect to said bottom plate (1), and a holding means (5) integral with said bottom plate (1), arranged to cooperate with a complementary holding means (6) integral with said dial (2), said holding means (5) and/or complementary holding means (6) comprising an elastic return means (7) for pressing said dial (82) resting onto said bottom plate (1). Said elastic return means (7) has tangential mobility in a plane (PT) perpendicular to the plane (P) of said bottom plate (2) and to a radial line (R) connecting the centre (O) of said bottom plate (2) to said elastic return means (7).

Abstract: Method of securing a watch bezel 1 including a case 3 and a crystal 2, characterized in that it includes a step of snap fitting the bezel 1 onto the crystal 2, during which snap fit means 6 are guided by guide means 5 arranged on case 3.

Abstract: A timepiece including a case including a middle part, which is closed on the top portion thereof by a bezel and on the bottom portion by a back cover, and a timepiece movement mounted against the middle part by a casing ring. The timepiece also includes a locking device for pressing the assembly including the timepiece movement and casing ring against the middle part when the case of the timepiece is closed.

Abstract: Method of securing a watch bezel 1 including a case 3 and a crystal 2, characterized in that it includes a step of snap fitting the bezel 1 onto the crystal 2, during which snap fit means 6 are guided by guide means 5 arranged on case 3.

Abstract: Method of fastening a glass (2) to a watch bezel (1), wherein the glass (2) has at least one protruding part (3) and/or a recess (4) and the bezel (1) has at least one protruding part (3) and/or a recess (4). The method is characterised in that it comprises a step of pressing the protruding part (3) into the recess (4).