US 12,455,536 B2
Spring for a notching system and timepiece notching system
Arthur Devillard, Champlecy (FR); and James Rejzner, Saint-Julien-en-Genevoix (FR)
Assigned to ROLEX SA, Geneva (CH)
Filed by ROLEX SA, Geneva (CH)
Filed on Dec. 21, 2021, as Appl. No. 17/558,569.
Claims priority of application No. 20216575 (EP), filed on Dec. 22, 2020.
Prior Publication US 2022/0197221 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G04B 19/28 (2006.01)
CPC G04B 19/286 (2013.01) 25 Claims
OG exemplary drawing
 
1. A notching system comprising:
a spring including a first toothset comprising n first teeth,
a first member including a second toothset comprising m second teeth, and
a second member mounted so as to be movable with respect to the first member,
the first and second toothsets being arranged so that, through their interactions, they define p notches or indexed positions,
the spring comprising:
at least two elastic arms, and
at least one first pivot connection element between the two elastic arms,
the second member comprising at least one second pivot connection element cooperating with the at least one first pivot connection element so as to create at least one fixed axis pivot connection between the spring and the second member,
so that deformations of the at least two elastic arms maintain angular and radial positions of the at least one fixed axis pivot connection relative to the second member when the second member is rotated,
wherein the elastic arms, when they are not loaded, are in the form of circular arcs. centers of which are situated on one and a same first circle coaxial with the spring and having a non-zero radius. wherein the first circle has a radius greater than 1.5 times the radius of the spring.