Anti-shock collet
AssigneeThe Swatch Group Research and Development Ltd
InventorsThierry Hessler, Jean-Jacques Born
Life of this patent
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Abstract
The collet, which can be made in a single piece and at the same time as the balance-spring, is formed by a plate (1) which includes an aperture (3) for attachment to a balance staff (5) and has an asymmetrical contour (9) which follows at a substantially constant distance d the contour of the first coil (11) of the inner terminal curve. The plate can further include recesses (13) for repositioning the centre of gravity g on the balance staff (5).
Claims8
1-7. (canceled)
An anti-shock collet formed of a plate including an aperture for attachment to a balance staff of a sprung balance regulating system of a mechanical timepiece movement, said collet being made at the same time as the balance spring of a brittle and shock-sensitive material, wherein said collet has an asymmetrical contour that follows, from the point at which the collet joins the balance-spring, at least from place to place at a substantially constant distance d the contour of the first coil of the inner terminal curve.
Dependencies are inferred from the claim text.