Components for clock movements

Abstract

The invention relates to a pivot arbor (1) for a timepiece movement, comprising at least one pivot (3) at at least one of its ends, the pivot (3) being composed of The first non-magnetic metallic material (4) is made so as to limit its sensitivity to magnetic fields. At least the outer surface of said pivot (3) is covered with a layer (5) of a second material selected from the group comprising Ni and NiP, and preferably chemical NiP. The invention relates to the field of watch movements.

Description

technical field

[0001] The present invention relates to a component for a timepiece movement, and in particular to a non-magnetic pivot arbor for a mechanical timepiece movement, and more particularly to a non-magnetic balance shaft, fork shaft and escape pinion. Background technique

[0002] Manufacturing pivot mandrels for timepieces involves performing a bar-turning operation on a hardenable steel bar to define various working surfaces (bearing surfaces, shoulders, pivots, etc.) and then subjecting the bar-turned mandrel to a heat treatment , the heat treatment includes at least one hardening operation to increase the hardness of the mandrel and one or more tempering operations to increase the toughness of the mandrel. The heat treatment operation is followed by an operation of rolling the pivots of the mandrel, which includes polishing the pivots to the required dimensions. The stiffness and roughness of the pivot portion are further improved during the rolling operatio...

Examples

Embodiment Construction

[0029] In this specification, the term "non-magnetic" refers to a paramagnetic or diamagnetic or antiferromagnetic material with a magnetic permeability lower than or equal to 1.01.

[0030] An alloy of an element is an alloy that includes at least 50% by weight of that element.

[0031] The present invention relates to a component for a timepiece movement, and in particular to a non-magnetic pivoting spindle for a mechanical timepiece movement.

[0032] The present invention will be described below with reference to the application of the non-magnetic pendulum shaft 1 . Of course, other types of timepiece pivoting spindles are also conceivable, such as a timepiece wheel set spindle, typically an escape pinion or a fork. Such a member has a body preferably less than 2 mm in diameter and a pivot preferably less than 0.2 mm in diameter, with a precision of a few microns.

[0033] refer to figure 1 , which shows a pendulum shaft 1 according to the invention comprising a plural...

technical field

[0001] The present invention relates to a component for a timepiece movement, and in particular to a non-magnetic pivot arbor for a mechanical timepiece movement, and more particularly to a non-magnetic balance shaft, fork shaft and escape pinion. Background technique

[0002] Manufacturing pivot mandrels for timepieces involves performing a bar-turning operation on a hardenable steel bar to define various working surfaces (bearing surfaces, shoulders, pivots, etc.) and then subjecting the bar-turned mandrel to a heat treatment , the heat treatment includes at least one hardening operation to increase the hardness of the mandrel and one or more tempering operations to increase the toughness of the mandrel. The heat treatment operation is followed by an operation of rolling the pivots of the mandrel, which includes polishing the pivots to the required dimensions. The stiffness and roughness of the pivot portion are further improved during the rolling operatio...

Examples

Embodiment Construction

[0029] In this specification, the term "non-magnetic" refers to a paramagnetic or diamagnetic or antiferromagnetic material with a magnetic permeability lower than or equal to 1.01.

[0030] An alloy of an element is an alloy that includes at least 50% by weight of that element.

[0031] The present invention relates to a component for a timepiece movement, and in particular to a non-magnetic pivoting spindle for a mechanical timepiece movement.

[0032] The present invention will be described below with reference to the application of the non-magnetic pendulum shaft 1 . Of course, other types of timepiece pivoting spindles are also conceivable, such as a timepiece wheel set spindle, typically an escape pinion or a fork. Such a member has a body preferably less than 2 mm in diameter and a pivot preferably less than 0.2 mm in diameter, with a precision of a few microns.

[0033] refer to figure 1 , which shows a pendulum shaft 1 according to the invention comprising a plural...

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