Hairspring-collet assembly for a timepiece movement

A clock mechanism and hairspring technology, applied in the field of hairsprings, can solve the problems of interference work, the abutting part cannot be used as an internal spinning thread, etc.

Active Publication Date: 2009-02-25
PATEK PHILIPPE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such an arrangement may cause the closest abutment to hit the internal screw thread during normal operation of the mechanism, possibly interfering with said operation, especially if the balance shaft oscillates significantly, and / or the furthest abutment The abutment may be too far apart, and under impact, the abutment does not act as a stop surface for the internal thread until the elastic limit is exceeded

Method used

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  • Hairspring-collet assembly for a timepiece movement
  • Hairspring-collet assembly for a timepiece movement
  • Hairspring-collet assembly for a timepiece movement

Examples

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Embodiment Construction

[0011] Such as figure 1 and figure 2 , according to the first embodiment of the present invention, a balance spring for a clock mechanism-collet assembly includes a collet 1 designed to fit on a balance shaft 2, and a collet 1 with an inner end connected to the collet 1 Hairspring 3. In the figure, balance spring 3 is partially shown, only its inner winding visible.

[0012] The inner pile 1 includes three elastic arms 4 arranged in a triangle. The elastic arm 4 forms a central equilateral triangular opening 5 whose inscribed circle has a diameter slightly smaller than the contact surface 6 of the cylindrical or generally conical shaft 2, enabling the shaft 2 to drive the collet 1, which drives the elastic arm 4 outwards. Elastic deformation occurs. By virtue of its triangular shape, the periphery of the opening 5 forms three discrete points 7 of contact with the shaft 2 . The width L of each elastic arm 4 varies in the manner of the elastic arms of the collet in documen...

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Abstract

A spiral/collet assembly for a horological movement comprises a collet (1) and a spiral (3) attached by its internal end to the collet (1). The collet (1) is suitable for being mounted on a spindle (2). The external contour of the collet (1) defines stops (10a, 10b, 10c) against which the internal turn of the spiral (3) can come to bear during a shock before the elastic limit of the internal turn is exceeded. The stops (10a, 10b, 10c) are situated at respective distances (Ra, Rb, Rc) from the centre (O) of the spindle (2) that increase in the direction (D) of the spiral (3) going from inside to outside from the point (8) where the spiral (3) joins the collet (1).

Description

technical field [0001] The invention relates to a hairspring-collet assembly for a clock mechanism, more precisely a hairspring whose inner end is connected to a collet capable of being driven by a balance shaft to form the mechanism's Adjustment device. Background technique [0002] It is well known that when a watch is subjected to shocks, the hairspring of the regulating device may deform beyond its elastic limit, thereby causing permanent deformation that endangers the normal functioning of the watch, or even destroys the material when the watch consists of fragile materials such as silicon. [0003] Patent CH 500 523 discloses a collet comprising three abutments resting against the inner spiral of the balance spring when subjected to radial impacts, so as to limit the deformation of the balance spring. The three abutting portions are equidistant from the center of the balance shaft. Therefore, one of the three abutments needs to be closer to the inner thread than the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B17/34G04B43/00
CPCG04B43/002G04B17/345
Inventor J-P·米西F·马耶尔S·冯贡滕
Owner PATEK PHILIPPE SA
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