Invention Grant
- Patent Title: Device for fastening a back on a middle for a timepiece
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Application No.: US17375398Application Date: 2021-07-14
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Publication No.: US11774912B2Publication Date: 2023-10-03
- Inventor: Joël Allimann , Benjamin Chartrel
- Applicant: The Swatch Group Research and Development Ltd
- Applicant Address: CH Marin
- Assignee: The Swatch Group Research and Development Ltd
- Current Assignee: The Swatch Group Research and Development Ltd
- Current Assignee Address: CH Marin
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: EP 191389 2020.08.17
- Main IPC: G04B37/00
- IPC: G04B37/00

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.
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