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Balance mechanism for a clockwork movement

A clock and rim technology, applied in the field of balance wheel mechanism

Active Publication Date: 2005-08-10
MONTRES BREGUET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in the case of this two-part construction, it is difficult to (center) correctly center the rim about the axis of rotation

Method used

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  • Balance mechanism for a clockwork movement
  • Balance mechanism for a clockwork movement

Examples

Experimental program
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Effect test

Embodiment Construction

[0014] figure 1 and 2 The balance 1 shown in , comprises a conventional steel arbor 2 supporting a balance wheel comprising a rim 3 and three arms 4, for example integral with the rim. For reasons of lightness explained above, this part is made of titanium or a titanium-based alloy. The arm 4 projects radially from a perforated central portion 5 which is pushed against a step 6 of the shaft 2 and abuts against a shoulder 7 . The shaft 2 also supports, in a conventional manner, a balance spring collet 8 for securing a balance spring not shown, and a double roller 9 for cooperating with an escapement lever.

[0015] For example, the following alloys can be used:

[0016] Titanium grade 2: AFNOR T40 (iron 0.25%, oxygen 0.048%, carbon 0.06%, nitrogen 0.05%, hydrogen 0.013%, the rest is titanium);

[0017] Grade 5 titanium: AFNOR TA6V6E2 (5.5% aluminum, 5.5% vanadium, 0.6% iron, 0.04% nitrogen, 2% tin, 0.6% copper, and the rest is titanium)

[0018] Due to the low density of t...

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Abstract

The balance (1) has an axle (2) made up of steel for supporting a balance wheel comprising arms (4) connected with a felloe (3). The arms and felloe are made up of a single piece with titanium or titanium-base alloy. The arms are radially projected from a drilled central part (5) that moves on a bearing of the axle by supporting against a shoulder.

Description

technical field [0001] The invention relates to a balance for a timepiece movement comprising a staff, a rim and an arm connecting the rim to the staff, and the balance The wheel mechanism is intended to interact with a hairspring to form, in a conventional manner, a mechanical oscillator that determines the fundamental frequency of a timepiece, especially a watch movement. A known construction of a balance of this type is shown, for example, in CH Patent No. 494992. technical background [0002] Currently, in balances for watch movements, the wheel-shaped parts including the rim (or tire) and the arms are made of copper-based alloys, especially beryllium-copper alloys, German silver or nickel. This alloy has an advantageous combination of properties including, inter alia, its non-magnetic properties, good chemical stability and sufficient mechanical properties. The density of these alloys is greater than 8kg / dm 3 . Their coefficient of thermal expansion is not particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B17/06
CPCG04B17/063
Inventor J·雷蒙
Owner MONTRES BREGUET
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