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).
Claims9
An anti-shock collet connected to a balance spring of a sprung balance regulating system, wherein the anti-shock collet comprises:
- a plate including an aperture formed therein for attachment to a balance staff of the sprung balance regulating system of a mechanical timepiece movement, wherein the sprung balance regulating system comprises the balance spring that includes a first coil that has an inner terminal curve, and the collet is made of a brittle and shock-sensitive material at the same time as the balance spring so there is no discontinuity of the material between the plate of the collet and the balance spring at a junction region connecting the plate of the collet and the balance spring as a single piece, wherein the collet has an asymmetrical contour that follows from the junction region, at which the collet joins the balance spring, to at least from place to place along a contour of the inner terminal curve of the first coil of the balance spring, and at a substantially constant distance d from the contour of the inner terminal curve of the first coil of the balance spring.
A mechanical timepiece movement comprising a sprung balance regulating system that includes an anti-shock collet connected to a balance spring, wherein the anti-shock collet comprises:
- a plate including an aperture formed therein for attachment to a balance staff of the sprung balance regulating system of a mechanical timepiece movement, wherein the sprung balance regulating system comprises the balance spring that includes a first coil that has an inner terminal curve, and the collet is made of a brittle and shock-sensitive material at the same time as the balance spring so there is no discontinuity of the material between the plate of the collet and the balance spring at a junction region connecting the plate of the collet and the balance spring as a single piece, wherein the collet has an asymmetrical contour that follows from the junction region, at which the collet joins the balance spring, along a contour of the inner terminal curve of the first coil of the balance spring, and at a substantially constant distance d from the contour of the inner terminal curve of the first coil of the balance spring.
An anti-shock collet connected to a balance spring of a sprung balance regulating system, wherein the anti-shock collet comprises:
- a plate including an aperture formed therein for attachment to a balance staff of the sprung balance regulating system of a mechanical timepiece movement, wherein the sprung balance regulating system comprises the balance spring that includes a first coil that has an inner terminal curve, and the collet is made of a brittle and shock-sensitive material at the same time as the balance spring so there is no discontinuity of the material between the plate of the collet and the balance spring at a junction region connecting the plate of the collet and the balance spring as a single piece, wherein the collet has an asymmetrical contour that follows from the junction region, at which the collet joins the balance spring, along a contour of the inner terminal curve of the first coil of the balance spring,
- wherein the contour of the collet is a scalloped curve having a succession of hollows and teeth, wherein ends of the teeth are at the substantially constant distance d from the inner terminal curve of the first coil.
A mechanical timepiece movement comprising a sprung balance regulating system that includes an anti-shock collet connected to a balance spring, wherein the anti-shock collet comprises:
- a plate including an aperture formed therein for attachment to a balance staff of the sprung balance regulating system of a mechanical timepiece movement, wherein the sprung balance regulating system comprises the balance spring that includes a first coil that has an inner terminal curve, and the collet is made of a brittle and shock-sensitive material at the same time as the balance spring so there is no discontinuity of the material between the plate of the collet and the balance spring at a junction region connecting the plate of the collet and the balance spring as a single piece, wherein the collet has an asymmetrical contour that follows from the junction region, at which the collet joins the balance spring, along a contour of the inner terminal curve of the first coil of the balance spring,
- wherein the contour of the collet is a scalloped curve having a succession of hollows and teeth, wherein ends of the teeth are at the substantially constant distance d from the inner terminal curve of the first coil.
Dependencies are inferred from the claim text.