公开(公告)号：US11774912B2

公开(公告)日：2023-10-03

申请号：US17375398

申请日：2021-07-14

Applicant: The Swatch Group Research and Development Ltd

Inventor： Joël Allimann ,  Benjamin Chartrel

IPC: G04B37/00

CPC classification number: G04B37/0008

Abstract: A device is for fastening a back on a middle of a watch. The back has a shoulder forming a cover arranged to cover entirely partly with the middle and a body arranged to rest in the middle. The device includes at least one pin integral with the middle, a seal mounted between the back and the middle. The back includes, near its periphery, at least one groove, the pin being arranged to slide in the groove between a first position, called the insertion position in which the back is free, and a second position called locking position in which the back is locked and positioned angularly relative to the middle. The groove includes at least one bump to form a hard point and increase the torque when the pin passes through the bump.