US 11,703,806 B2
Method for manufacturing a bevelled stone, particularly for a horological movement
Bruno Besutti, Charquemont (FR); Sebastien Retrouvey, Chissey sur Loue (FR); and Sebastien Midol, Sancey (FR)
Assigned to Comadur SA, Le Locle (CH)
Filed by Comadur SA, Le Locle (CH)
Filed on Jun. 5, 2020, as Appl. No. 16/893,590.
Claims priority of application No. 19188535 (EP), filed on Jul. 26, 2019.
Prior Publication US 2021/0026307 A1, Jan. 28, 2021
Int. Cl. B28D 1/22 (2006.01); G04B 31/06 (2006.01); B22F 3/16 (2006.01); B22F 5/10 (2006.01); G04B 31/008 (2006.01); G04D 3/00 (2006.01); C04B 35/105 (2006.01); B28B 3/02 (2006.01); B28D 1/20 (2006.01)
CPC G04B 31/06 (2013.01) [B22F 3/162 (2013.01); B22F 5/106 (2013.01); B28B 3/021 (2013.01); B28D 1/20 (2013.01); B28D 1/22 (2013.01); C04B 35/105 (2013.01); G04B 31/0087 (2013.01); G04D 3/0058 (2013.01); G04D 3/0071 (2013.01); B22F 2302/10 (2013.01); B22F 2302/20 (2013.01); B22F 2302/25 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for manufacturing a bevelled stone for a timepiece, comprising:
producing a precursor from a mixture of at least one material in powder form with a binder;
pressing the precursor so as to form a green body, using a top die and a bottom die, the bottom die comprising a protruding rib without the top die comprising a protruding rib;
sintering said green body so as to form a body of the future stone in said at least one material, the body comprising a peripheral face and a bottom face provided with a groove; and
machining the body including planing the peripheral face up to the groove, such that an inner wall of the groove forms at least a flared part of the peripheral face of the stone.