Barrel for timepiece

Patent metadata

Field	Value
Publication number	US-12481246-B2
Application number	US-202217970193-A
Country	US
Kind code	B2
Filing date	Oct 20, 2022
Priority date	Dec 29, 2021
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A barrel ( 1 ) for self-winding timepiece including a drum ( 11 ) provided with an inner lateral wall ( 12 ) and a mainspring ( 2 ) forming a winding including an outer coil ( 21 ) the end ( 22 ) of which is friction coupled with the inner lateral wall and free to slip against the inner lateral wall in the event of overtension of the mainspring ( 2 ). The end of the outer coil includes an external face ( 23 ) having two friction surfaces ( 24, 25 ) disposed in the top and bottom portion of the outer coil and arranged to be in contact with the inner lateral wall in such a way that the portion between the friction surfaces, referred to as central portion ( 26 ), is not in contact with the inner lateral wall, the central portion forming a reservoir ( 27 ) for a lubricant between the two friction surfaces.

First claim

The invention claimed is:

1 . A barrel for self-winding timepiece, comprising:
a drum provided with an inner lateral wall, and a mainspring forming a winding including an outer coil the end of which is friction coupled with said inner lateral wall and free to slip against the inner lateral wall in the event of overtension of the mainspring, wherein the end of said outer coil comprises an external face having two friction surfaces disposed in the top and bottom portion of the outer coil and arranged to be in contact with the inner lateral wall in such a way that a central portion between the friction surfaces is not in contact with the inner lateral wall, said central portion forming a reservoir for a lubricant between the two friction surfaces.

2 . The barrel according to claim 1 , wherein the friction surfaces are formed by removing material, on one portion of the thickness of the outer coil or on the entire thickness, at the central portion of the outer coil.

3 . The barrel according to claim 2 , wherein the removal of material is in the form of a funnel, of a neck, of a parabola or of a semi-circle.

4 . A movement comprising a barrel according to claim 1 .

5 . A timepiece comprising a barrel according to claim 1 .

6 . A timepiece comprising a movement according to claim 4 .

Assignees

• Nivarox Far Sa

Inventors

• Vorpe Gerard
• Jeanneret Laurent
• Cusin Pierre

Classifications

• G04B1/16 Primary

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

• G04B5/24 Primary

  Protecting means preventing overwinding (arranged in, or attached to, the barrel G04B1/20; in connection with keys or the like G04B3/06; in connection with parts of the cases G04B3/10 {; support of the moving weight G04B5/18; protection means G04B9/02; electrical driving means for mechanical clockworks G04C1/10}) · CPC title

• G04B5/02

  by self-winding caused by the movement of the watch {(bearings, suspensions for oscillating weights G04B5/18; mechanisms for transformation of an oscillating movement into a rotating movement in only one direction G04B11/00)} · CPC title

• G04B1/145 Primary

  Composition and manufacture of the springs (compositions and manufacture of components, wheels, spindles, pivots, or the like G04B13/02; compositions of component escapements G04B15/14; composition and manufacture or hairsprings G04B17/066; compensation for the effects of variations of temperature of springs using alloys, especially for hairsprings G04B17/227; materials for bearings of clockworks G04B31/00; heat treatment and chemical or mechanical treatment for control of the structure C21D8/00; iron and steel alloys C22C; non-ferrous alloys C22C and B22F) · CPC title