US 12,342,910 B2
Jewel, in particular for a horological movement, and the manufacturing method thereof
Bruno Besutti, Charquemont (FR); Sébastien Retrouvey, Chissey sur Loue (FR); and Sébastien Midol, Sancey (FR)
Assigned to Comadur S.A., Le Locle (CH)
Filed by Comadur SA, Le Locle (CH)
Filed on Nov. 16, 2020, as Appl. No. 17/099,119.
Claims priority of application No. 19214879 (EP), filed on Dec. 10, 2019.
Prior Publication US 2021/0169184 A1, Jun. 10, 2021
Int. Cl. B28B 11/04 (2006.01); A44C 17/00 (2006.01); B28B 3/08 (2006.01); B28B 11/08 (2006.01); B28B 11/12 (2006.01); B28B 11/24 (2006.01); G04B 31/06 (2006.01); G04D 3/00 (2006.01)
CPC A44C 17/005 (2013.01) [B28B 3/086 (2013.01); B28B 11/04 (2013.01); B28B 11/0845 (2013.01); B28B 11/12 (2013.01); B28B 11/243 (2013.01); G04B 31/06 (2013.01); G04D 3/0058 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method (10) for manufacturing a jewel (40) of a polycrystalline type for a timepiece, the jewel (40) comprising poly-ruby of a type A12O3Cr or Zirconia of a type ZrO2, the method comprising:
a first step (7) of producing a precursor (21),
a second step (8) of pressing the precursor (21) in order to form a body (30),
the pressing (8) being carried out using a pressing device (20) provided with an upper die (22) and a lower die (16) defining a pressing space (25) in which the precursor (21) is disposed,
the device (20) being provided with a wire (17) passing through at least part of the lower die (16) to open out into the pressing space (25),
the lower die (16) being configured to slide about the wire (17) during the pressing step (8),
the pressing (8) taking place by bringing the lower die (16) and the upper die (22) closer to one another to form a body (30) comprising a bottom face (37) provided with a hole (32),
wherein the upper die (22) is stationary during the pressing step (8).