Rolex Sa

Jerome Daout

Richard Bossart

Jean-Marc Bonard

An integral assembly of a single or double hairspring and an unsplit collet including two portions opposite one another for receiving the balance staff, one portion including one of the bearing surfaces (or) for the balance staff and a point () for attaching the hairspring, and the other portion including another bearing surface (or) for the balance staff, the two portions being connected together by two linking portions that are less rigid than the receiving portions so as to be capable of elastically deforming during the fitting of a balance staff. According to another aspect, the invention also relates to an integral assembly of a hairspring and a collet, including at least two stages, as well as to a method for manufacturing such an assembly.

Integral assembly of a hairspring and a collet

A split collet in which the contour of the central opening that is intended to receive a balance staff is not circular. The collet is characterized in that the contour () of the central opening () comprises a limited number of supporting parts () intended to co-operate with the balance shaft, said number being greater than two.

Split collet with a non-circular opening

The present invention relates to a hairspring for a timepiece hairspring-balance oscillator, which can be produced, in particular, from a low-density material such as silicon, diamond or quartz, and to a method of manufacturing such a hairspring. According to the invention, this hairspring comprises at least one leaf () the cross section of which has a thickness and a height and its characterizing feature is that the leaf () comprises a plurality of apertures () extending in the heightwise direction of the leaf and alternating with bridges (). The invention also relates to a method of manufacturing such a hairspring.

Hairspring for timepiece hairspring-balance oscillator, and method of manufacture thereof

Hairspring for a balance wheel/hairspring resonator, comprising n blades, where n&#x2267;2, which are fastened via at least one of their respective homologous ends and wound in spirals with an angular offset capable of neutralizing the lateral forces liable to be exerted on its central arbor when one of the ends of each blade is moved angularly around said central arbor relative to its other end.

Hairspring for a balance wheel/hairspring resonator

This flat balance spring for a horological balance comprises a wound strip shaped to ensure an approximately concentric development of the balance spring and almost zero force on the pivots and on the fixing point, during a rotation of less than 360&#xb0; of its inner end relative to its outer end in both directions from its rest position. The stiffness of its strip decreases gradually and through more than 360&#xb0; from each of its two ends, the lowest stiffness being situated in the median part of the strip.

Flat balance spring for horological balance and balance wheel/balance spring assembly

The invention relates to a backlash-compensating toothed moving part, for a precision gear assembly, particularly in clock-making, in which the backlash-compensating teeth each have a section extending symmetrically to both sides of the radius of said mobile passing the tip of said teeth with an elastic connection to said mobile to give said teeth a freedom of movement in the plane of the mobile, at least one tooth in two being a backlash-compensating tooth comprising stop means arranged to limit the freedom of movement as a function of the backlash in the gear assembly to be compensated for.

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Rolle, Switzerland

Jerome Daout