Fastening part of a hairspring

Patent metadata

Field	Value
Publication number	US-10409223-B2
Application number	US-201715609749-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Jun 1, 2016
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

An assembly ( 300 ) includes (i) a hairspring ( 2 ) made of a paramagnetic alloy including at least one of the following elements: Nb, V, Ta, Ti, Zr and Hf, notably an alloy including the elements Nb and Zr with between 5% and 25% by mass of Zr and an interstitial doping agent including oxygen, and (ii) at least one fastening part ( 1; 1 ′), notably two parts ( 1; 1 ′), in particular a stud ( 1 ) or a collet ( 1 ′), for an end ( 2 a; 2 b ) of the hairspring ( 2 ), the at least one part ( 1; 1 ′) having a first portion ( 10; 10 ′) that is designed to come into contact with the hairspring ( 2 ) and that is made of titanium or titanium alloy or of tantalum or tantalum alloy, notably grade 2 titanium or grade 5 titanium.

First claim

The invention claimed is:

1. An assembly comprising:
hairspring made of a paramagnetic alloy, and
at least one fastening part including a stud, the stud having a first portion designed to come into contact with the hairspring and made of titanium, titanium alloy, tantalum, or tantalum alloy,
wherein the first portion has first and second bearing surfaces separated by a slot, wherein each of the first surface and second surface is a bearing surface in contact with a same face of the hairspring, the hairspring being fastened to each of the first and second bearing surfaces.

2. The assembly as claimed in claim 1 , wherein each of the bearing surfaces comes into contact with the hairspring.

3. The assembly as claimed in claim 2 , wherein each of the bearing surfaces has, at at least one of ends of the bearing surfaces in the direction of the height of the hairspring, a positioning shape extending perpendicular or substantially perpendicular to the respective bearing surface.

4. The assembly as claimed in claim 2 , wherein each of the bearing surfaces has, at two of the ends of the bearing surfaces in the direction of a height of the hairspring, respectively a first positioning shape and a second positioning shape, the shapes extending perpendicular or substantially perpendicular to the respective bearing surface.

5. the assembly as claimed in claim 2 , wherein the slot extends in the direction of a height of the hairspring over a height greater than the height of the hairspring.

6. The assembly as claimed in claim 1 , wherein the at least one fastening part includes a second portion designed to come into contact with a stud support or with a balance arbor.

7. The assembly as claimed in claim 1 , wherein the bearing surfaces are arranged substantially perpendicular to a plane of the hairspring and together form an angle.

8. The assembly as claimed in claim 7 , wherein the angle formed by the bearing surfaces is in a range of from 150° to 179° considered from an axis of the hairspring.

9. The assembly as claimed in claim 1 , wherein the bearing surfaces are curved to form portions of a single cylinder of revolution or are made tangential to a single cylinder of revolution.

10. The assembly as claimed claim 9 , wherein the at least one fastening part also includes a collet and wherein the cylinder of revolution is centered on an axis of the collet.

11. The assembly as claimed in claim 9 , wherein the bearing surfaces are arranged substantially perpendicular to a plane of the spiral spring.

12. The assembly as claimed claim 1 , wherein the at least one fastening part also includes a collet and wherein the collet includes at least one stop.

13. A manufacturing method for an assembly, the method including:
providing a stud,
providing the hairspring,
fastening the stud to the hairspring,
so as to obtain the assembly as claimed in claim 1 .

14. The manufacturing method as claimed in claim 13 , wherein the fastening step is performed by laser welding.

15. A manufacturing method for an assembly, the method including:
providing a stud,
providing the hairspring,
providing a collet,
fastening the stud to the hairspring and fastening the collet to the hairspring,
so as to obtain the assembly as claimed in claim 1 wherein the at least one part also includes the collet.

16. A clockwork oscillator or clockwork movement or timepiece including an assembly as claimed in claim 1 .

17. The assembly as claimed in claim 1 , comprising two fastening parts.

18. The assembly as claimed in claim 1 , wherein the paramagnetic alloy of the hairspring includes at least one of the following elements: Nb, V, Ta, Ti, Zr and Hf.

19. The assembly as claimed in claim 18 , wherein the paramagnetic alloy of the hairspring includes the elements Nb and Zr with between 5% and 25% by mass of Zr and an interstitial doping agent including oxygen.

20. The assembly as claimed in claim 1 , wherein the first portion is made of grade 2 titanium or grade 5 titanium.

21. The assembly as claimed in claim 1 , wherein the bearing surfaces are arranged substantially perpendicular to a plane of the spiral spring.

22. The assembly as claimed in claim 1 , wherein the paramagnetic alloy includes the elements Nb and Zr with between 5% and 25% by mass of Zr and an interstitial doping agent including oxygen.

23. The assembly as claimed in claim 1 , wherein the at least one fastening part is made of grade 2 titanium.

24. The assembly as claimed in claim 1 , wherein the hairspring is welded to each of the first and second bearing surfaces.

25. The assembly as claimed in claim 1 , wherein the slot passes through an entire thickness of the stud.

Assignees

• Rolex Sa

Inventors

• Balague Olivier
• Gritti Dominique
• Gyger Thomas
• Papes Ondrej
• Rime Antoine

Classifications

• G04B17/345

  Details of the spiral roll · CPC title

• G04B17/325 Primary

  for fastening the hairspring in a fixed position, e.g. using a block · CPC title

• G04B17/34 Primary

  for fastening the hairspring onto the balance · CPC title

• G04B17/066

  Manufacture of the spiral spring (locking of the spiral spring by the regulating lever G04B18/026; spiral spring with temperature compensation G04B17/227; fixation of the spiral spring on the collet G04B17/32; mainspring G04B1/14) · CPC title

• G04B17/063

  Balance construction (balances with frequency adjustment screw G04B18/006; balances with temperature compensation G04B17/222; balancing devices G04B17/28) · CPC title