Part for a timepiece movement

Patent metadata

Field	Value
Publication number	US-9389587-B2
Application number	US-201514852074-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Jan 17, 2013
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A metal pivot pin includes at least one pivot at at least one of its ends, and the metal is an austenitic steel, an austenitic cobalt alloy, or an austenitic nickel alloy in order to limit a sensitivity of the pin to magnetic fields. At least an outer surface of the at least one pivot is hardened to a predetermined depth relative to the rest of the pin in order to harden the at least one pivot.

First claim

What is claimed is:

1. A pivot pin for a timepiece movement, comprising:
at least one pivot at one or more ends of the pin, wherein
the pin is formed of a metal that is an austenitic cobalt alloy or an austenitic nickel alloy so as to limit a sensitivity of the pin to magnetic fields, and
at least an outer surface of said at least one pivot includes diffused atoms that harden the austenitic cobalt alloy or the austenitic nickel alloy of the outer surface to a predetermined depth relative to a core of the pin.

2. The pivot pin according to claim 1 , wherein the hardened outer surface includes an interstitial saturation of the diffused atoms.

3. The pivot pin according to claim 1 , wherein the predetermined depth represents between 5% and 40% of a total diameter of the at least one pivot.

4. The pivot pin according to claim 1 , wherein the hardened outer surface includes the diffused atoms of at least one chemical element.

5. The pivot pin according to claim 4 , wherein said at least one chemical element is a non-metal.

6. The pivot pin according to claim 5 , wherein said non-metal is at least one of nitrogen and carbon.

7. The pivot pin according to claim 1 , wherein the hardened outer surface includes a hardness of more than 1000 HV.

8. The pivot pin according to claim 1 , wherein the pin includes two pivots.

9. A movement for a timepiece wherein the movement comprises the pivot pin according to claim 1 .

10. A movement for a timepiece wherein the movement comprises at least one of a balance staff, a pallet staff, and an escape pinion including the pivot pin according to claim 1 .

11. A pivot pin for a timepiece movement, comprising:
at least one pivot at one or more ends of the pin, wherein
the pin is formed of a metal that is selected from among a group comprising austenitic chromium-nickel stainless steels including at least 16.5% Cr and 10% Ni, austenitic cobalt steels including at least 39% cobalt, and austenitic nickel steels including at least 33% nickel, and
at least an outer surface of said at least one pivot includes diffused atoms that harden the metal of the outer surface, which is selected from among the group, to a predetermined depth relative to a core of the pin.

12. The pivot pin according to claim 11 , wherein the hardened outer surface includes an interstitial saturation of the diffused atoms.

13. The pivot pin according to claim 11 , wherein the metal forming the pin is selected from among a group including X2CrNiMo17-12-2+Su+Cu austenitic steels when the pin is made of an austenitic chromium-nickel stainless steel, K13C20N16Fe15D7 austenitic type cobalt alloys when the pin is made of an austenitic cobalt steel, and the austenitic nickel alloy including a composition of 35% Ni, 20% Cr, 10% Mo, 33% Co and a remainder comprised of additives when the pin is made of an austenitic nickel steel.

14. The pivot pin according to claim 11 , wherein the predetermined depth represents between 5% and 40% of a total diameter of the at least one pivot.

15. The pivot pin according to claim 11 , wherein the hardened outer surface includes the diffused atoms of at least one chemical element.

16. The pivot pin according to claim 11 , wherein the hardened outer surface includes a hardness of more than 1000 HV.

17. The pivot pin according to claim 11 , wherein the pin includes two pivots.

18. A movement for a timepiece wherein the movement comprises the pivot pin according to claim 11 .

19. A movement for a timepiece wherein the movement comprises at least one of a balance staff, a pallet staff, and an escape pinion including the pivot pin according to claim 11 .

Assignees

• Omega Sa
• Omega Sa

Inventors

• Von Gruenigen Cedric
• Charbon Christian
• Verardo Marco

Classifications

• G04B1/04

  Mechanisms in which the clockwork acts as the driving weight · CPC title

• Y10T29/49

  Method of mechanical manufacture · CPC title

• G04B1/16

  Barrels; Arbors; Barrel axles (arrangements facilitating the removal of the mainspring G04B33/14) · CPC title

• G04B13/026

  Physics · mapped topic

• G04B15/14 Primary

  Component parts or constructional details, e.g. construction of the lever or the escape wheel {(assembly and manufacture of the spring G04B1/145; assembly and manufacture of components, e.g. pinions, spindles G04B13/02; lubrication of clockwork bearings G04B31/008; oils for clockwork bearings in general G04B31/08)} · CPC title