Abstract: A watch press is provided with a press block for pressing the backs onto wristwatches. The press block defines a clearance through which a watch band can be routed while pressing a back to the attached watch. The press block can be generally U-shaped with the clearance defined between upper and lower members thereof.

Abstract: Device for securing a first element of a watch 1 having a first threaded portion 11 to a second watch element 2 including a second threaded portion 22, including an intermediate element 3 for the angular orientation of the first element 1 relative to the second element 2. The intermediate element 3 includes a third threaded portion 31, arranged for cooperating with the first threaded portion 11 of the first element 1, and a fourth threaded portion 32, arranged to cooperate with the second threaded portion 22 of the second element 2. The thread pitches of the third threaded portion 31 and fourth threaded portion 32 are different.

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: In order to open the watch case (1) by extraction of the crystal (2) such case is secured in an enclosure (3) after its stem and crown have been removed. Next, a suction cup (4) is applied to the crystal, such suction cup being maneuverable from outside the enclosure by means of a handle (40). By means of a pump controlled by a lever (37) the enclosure is subjected to a predetermined overpressure, following which a pulling force (A) is exerted on the suction cup until extraction of the crystal. The overpressure being the same at both the exterior and interior of the case, no displacement of air is brought about and hence no damage to the watch mechanism when the crystal is separated from the case.

Abstract: In the manufacture of a watch case part comprising a glass and a middle having an opening for the glass, the following operations are carried out: first, a metallic coating is deposited on a peripheral portion of the glass, then one or more elements are formed on the coating by moulding a molten material having an affinity for the metal forming the coating, whereupon the glass is secured to the middle through the intermediary of the fastening element. The fastening element may consist of a heel extending around the periphery of the glass or of fastening studs extending at right angles to the plane of the glass. In some cases the fastening element may also act as sealing element.

Abstract: To simplify fitting and sealing the crystal (4) to the casing (2, 6, 8), assembly is effected by means of ultrasonic welding. The casing (2, 6, 8) and the crystal (4) are made of synthetic materials which are thermo-weldable to each other. The mating faces (8a, 4b) of the peripheral wall (8) of the casing and the crystal (4) are formed for reducing the contact area between the two parts to permit thermo-welding by subjecting the assembly to high-frequency mechanical vibrations imparted by a tool (15).