Sealing system for timepiece case
A sealing system for a case of a timepiece, including: a first seal intended to be inserted between a middle on one side and a ring and a glass on the other side, a second seal intended to be inserted between a middle and a glass, the first and second seals being two distinct seals, in particular two independent seals or two separate seals, and/or the first and second seals being made of two distinct materials.
1. A sealing system for a case of a timepiece, comprising:
a first seal intended to be inserted between a middle on one side and a ring and a glass on the other side,
a second seal intended to be inserted between a middle and a glass,
the first and second seals being two distinct seals, including two independent seals or two separate seals, and/or
the first and second seals being made of two distinct materials.
2. The sealing system as claimed in claim 1 , wherein the second seal comprises a radial section whose area S 12 is smaller than the area S 11 of the radial section of the first seal, the ratio S 12 /S 11 being less than 0.4, the areas being determined in a non-deformed state of the seals.
3. The sealing system as claimed in claim 1 , wherein the second seal has a circular radial section, notably with a circle diameter of between 0.5 mm and 1.5 mm, the form of the section and/or the diameter being determined in a non-deformed state of the second seal, and/or wherein the second seal is configured so as to exclusively ensure the sealing of a case of a timepiece, at a glass, notably at a glass-middle interface, as an alternative to or complementing the first seal.
4. The sealing system as claimed in claim 1 , wherein the first seal has an I-shaped or L-shaped radial section and/or wherein the first seal is configured so as to mechanically link on its own a glass to a middle and/or a ring to a middle.
5. The sealing system as claimed in claim 1 , wherein the first seal has a height h 1 and a greater thickness e 1 , the ratio h 1 /e 1 being between 3 and 10, the height and thickness being determined in a non-deformed state of the first seal.
6. The sealing system as claimed in claim 1 , wherein the first seal is manufactured in a material chosen from among thermoplastic polyamides.
7. The sealing system as claimed in claim 1 , wherein the second seal is manufactured in a material chosen from among the elastomers.
8. The sealing system as claimed in claim 1 , wherein the first and second seals are produced in the form of one and the same seal packing comprising a first portion forming the first seal, notably at a first end of the packing, and a second portion forming the second seal, notably at a second end of the packing.
9. A case of a timepiece comprising:
a middle,
a ring,
a glass, and
the sealing system as claimed in claim 1 .
10. The case of a timepiece as claimed in claim 9 , wherein the middle comprises a chimney protruding from a top face of the middle or wherein the middle comprises a chimney protruding from a top face of the middle and the chimney comprises a rim for closing a housing for receiving the first seal and/or the second seal formed in the middle.
11. The case of a timepiece as claimed in claim 9 , wherein the ring comprises a flange and/or wherein the ring comprises a bottom.
12. A timepiece comprising the sealing system as claimed in claim 1 .
13. A method for fitting the case of a timepiece as claimed in claim 9 , comprising the following steps:
placing the first seal and the second seal on a ring and glass assembly,
sliding the middle over the assembly obtained in the preceding step.
14. The sealing system as claimed in claim 1 , wherein the ratio S 12 /S 11 is less than 0.3.
15. The sealing system as claimed in claim 1 , wherein the ratio S 12 /S 11 is less than 0.2.
16. The sealing system as claimed in claim 5 , wherein the ratio h 1 /e 1 is between 4 and 8.
17. The sealing system as claimed in claim 6 , wherein the first seal is manufactured in a material chosen from among thermoplastic polyamides from the group consisting of nylon, zytel and hytrel.
18. The sealing system as claimed in claim 1 , wherein the second seal is manufactured from a fluoroelastomer FKM.
19. A timepiece comprising the case as claimed in claim 9 .
20. A method for fitting the timepiece as claimed in claim 12 , comprising the following steps:
placing the first seal and the second seal on a ring and glass assembly,
sliding the middle over the assembly obtained in the preceding step.