Device for fastening a back on a middle for a timepiece
AssigneeThe Swatch Group Research and Development Ltd
InventorsJoël Allimann, Jean-Claude Martin, Simon Garcin
Life of this patent
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Abstract
A device is for fastening a back on a middle of a watch. The back includes a cover arranged to form a bearing surface with the middle and a body arranged to rest in the middle. The device includes a ring disposed between the back and the middle, the ring being arranged to ensure the water resistance and indexing of the back. The ring includes an upper part ensuring the water resistance and a median part including positioning to ensure precise placement of the back.
Claims8
A device for fastening a back on a middle of a watch, the back comprising a cover arranged to form a bearing surface with the middle and a body arranged to rest in the middle, said device comprising:
- a ring disposed between the back and the middle, said ring being arranged to ensure water resistance and indexing of the back,
- wherein the ring comprises an upper part ensuring the water resistance and a median part comprising positioning means to ensure a precise and indexed placement of the back,
- wherein the ring has a lower part, said lower part including at least one clip formed on an internal wall of the lower part to cooperate with a slot formed in the body of the back and at least one internal lug formed on the internal wall of the lower part to cooperate with a machining formed in the back, a height of the lug being greater than a height of the clip.
Dependencies are inferred from the claim text.