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Antifriction coating for mainspring made of composite material

A mainspring and mainspring technology, which is applied in the driving mechanism of clocks, mechanically driven clocks, instruments, etc., can solve the deformation of the mainspring, the cracking or delamination of the coating, and the inability to ensure the satisfactory quality of the coating and the mainspring. problems of combination

Inactive Publication Date: 2014-10-01
CARTIER INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, between the winding and unwinding positions, the surface of the mainspring faces very large deformations
In the case of the above coating, the repetition of such deformations during the winding and unwinding of the mainspring can lead to cracking or delamination of the coating
For the same reason, coatings whose elastic properties are provided by covalent or ionic bonds, such as those made of ceramics or diamonds, do not ensure satisfactory bonding of the coating to the mainspring

Method used

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  • Antifriction coating for mainspring made of composite material
  • Antifriction coating for mainspring made of composite material
  • Antifriction coating for mainspring made of composite material

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Embodiment Construction

[0023] In one embodiment, mainspring 1 is made of composite material. The term "composite material" is understood here to mean a polymer matrix comprising fibers, such as glass fibers or other fibres. Preferably, the fibers are unidirectionally oriented in the polymer matrix. Such springs made of polymer material may be less susceptible to fatigue fracture than conventional metal springs, and thus may have a longer life.

[0024] The fibers of such composite springs may be made of carbon, glass or aramid, or may also have another property (such as a mixture of fibers), but in any case their axial modulus of elasticity is preferably between Between 80 GPa and 600 GPa. The fibers generally have the same length as the spring and are positioned as parallel as possible to the main length of the spring. Preferably, the angle between the axis of each fiber and the axis of the mainspring is as close to 0° as possible and does not locally exceed 5°. Fibers typically have a diameter...

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Abstract

Mainspring for driving a clock movement, said mainspring being made of a material comprising a polymer matrix containing fibres, said mainspring having a coating containing a thermoset or thermoplastic polymer. The mainspring proposed reduces the friction of the turns of the mainspring.

Description

technical field [0001] The invention relates to a coated mainspring for a drive element in a mechanical timepiece movement. The coating makes it possible to reduce the frictional effect of the windings of the spring and to have a good bond. Background technique [0002] The barrel-type spiral mainspring is the element that makes it possible to store the mechanical energy necessary for the operation of the watch. In general, its geometry and the mechanical properties of the material from which it is composed determine the possible energy that a helical mainspring can store and the maximum torque it can transmit. The unwinding of the mainspring strip generates the energy required for the operation of the watch. figure 1 An exploded view of mainspring 1 housed in barrel drum 2 is shown. The shape of the clockwork strip has evolved into what is called the reverse S-shape (see figure 2 and "Théorie d'horlogerie" [Principles of Horology] by C-A Reymondin et al., published by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B1/14
CPCG04B1/145
Inventor C.阿夫里D.佩雷奧J-M.蒂斯塞兰德
Owner CARTIER INT