Wheel for a reduced-inertia escapement system

Patent metadata

Field	Value
Publication number	US-12461489-B2
Application number	US-202318175861-A
Country	US
Kind code	B2
Filing date	Feb 28, 2023
Priority date	Jun 8, 2022
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A wheel for an escapement system including a hub intended to be mounted with a staff for rotation therewith, the staff being intended to be subjected to a mechanical torque, a felloe, at least two arms extending from the hub to the felloe, and a toothing formed by a plurality of teeth. The wheel for the escapement system includes at least one recess on at least one of the faces thereof, the recess extending from the felloe to the hub.

First claim

The invention claimed is:

1 . A wheel for an escapement system comprising:
a hub configured to be mounted with a staff for rotation therewith, the staff configured to be subjected to a mechanical torque; a felloe; at least two arms extending from the hub to the felloe; and a toothing formed by a plurality of teeth, wherein said wheel for the escapement system includes a front face and a rear face opposite to the front face and includes at least one recess on each of the front and rear faces thereof, the at least one recess extending from the felloe to the hub, and wherein the recesses on the front face and the rear face are asymmetrical relative to a horizontal plane formed by the arms and the felloe of the escape wheel such that a height of the recess on the front face is different than a height of the recess on the rear face.

2 . The wheel for the escapement system according to claim 1 , wherein the wheel has a thickness of at least 0.10 mm.

3 . The wheel for the escapement system according to claim 1 , wherein the at least one recess has a height of between 0.02 mm and 0.05 mm.

4 . The wheel for the escapement system according to claim 1 , wherein the at least one recess extends partly over the felloe and forms a border at an edge of the felloe of at least 0.02 mm.

5 . The wheel for the escapement system according to claim 1 , wherein the wheel comprises at least two arms.

6 . The wheel for the escapement system according to claim 1 , wherein the recesses are symmetrical relative to a horizontal plane formed by the arms and the felloe of the escape wheel.

7 . The wheel for the escapement system according to claim 1 , wherein the wheel is made of a material selected from steel, silicon or a metal alloy.

8 . The wheel for the escapement system according to claim 1 , wherein said at least one recess is produced by milling, turning, sinking, laser machining, DRIE or LIGA.

9 . The wheel for the escapement system according to claim 1 , wherein the wheel is an escape wheel, an intermediate wheel or a fourth wheel.

10 . An escapement system comprising the wheel for the escapement system according to claim 1 .

11 . A horological movement comprising the escapement system according to claim 10 .

12 . A horological movement comprising the escape wheel according to claim 1 .

Assignees

• Nivarox Far Sa

Inventors

• Jeanneret Laurent
• RENARD STéPHANE

Classifications

• 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

• G04B13/027 Primary

  planar toothing: shape and design (adjusting the backlash of the arbors G04B35/00) · CPC title