Abstract: Provided is a timepiece part that reduces axial runout of a flat member when the rotating axle thereof turns. A escape wheel and pinion 18 includes an axle member having a first shaft 44 and a second shaft 45 that is larger in diameter than the first shaft, and a seat 48 disposed outside the position where the first shaft and the second shaft connect; a guide member 49 disposed in contact with the seat, having a first hole in which the first shaft is inserted, and having a diameter greater than the second shaft; an escape wheel 23 disposed in contact with the guide member and having a second hole in which the first shaft is inserted; and a fixing member 50 disposed in contact with the escape wheel, having a third hole in which the first shaft is inserted.

Abstract: Mainspring for driving a clock movement, said mainspring being made of a material comprising a polymer matrix containing fibres, said mainspring having a coating containing a thermoset or thermoplastic polymer. The mainspring proposed reduces the friction of the turns of the mainspring.

Abstract: Timepiece barrel assembly (1) including a barrel arbour (18) including between first (181) and second (182) guide shoulders, a median shoulder (84) carrying a core (4) and a spring (2) mounted between a drum (3) and this core (4). This barrel arbour (18) includes, between this first shoulder (181) and this core (4), a ratchet-holder (81) for securing a ratchet (2). The core (4) includes, on the same side as and at a distance from this ratchet-holder (81), a first part (43) for guiding the pivoting of this drum (3), in immediate proximity to which there is fixed this ratchet (12) at a distance from and on the same side as this first shoulder (181). The ratchet-holder (81) directly or indirectly limits the shake of this drum (3) relative to a bearing surface (43A) of this core (4) at the edge of a receiving surface (5) for this spring (2).

Abstract: An improved socket set with a timer has an upper cover and a lower shelter that are combined to form a case in which a timer, a circuit board, an IC board and two socket seats are housed. The timer can be easily removed and selectively oriented in one of four orthognal directions. The socket seats can also be removed and limitedly refined by turning 90 degrees around so as to facilitate the installation of the socket set in different situations.