Drive member for clock movement
AssigneeCartier Creation Studio SA
InventorsRomain Moyse, Kewin Bas, Dominique Perreux
Life of this patent
Estimating the term…
Abstract
Drive member for timepiece movement comprising: a barrel comprising a drum mounted on an arbor; a main spring wound inside the barrel, and a core coaxial with and pivoting on the arbor; the exterior end of the spring being coupled to the drum and the interior end of the spring being coupled to the core; the exterior end of the spring is coupled to the drum by a first clamp that is pivot-mounted in the drum so that when the spring is unwound, the first clamp pivots in such a way as to hold the exterior turn of the first spring against the drum and when the spring is wound up, the first clamp pivots towards the center of the barrel to follow the exterior turn of the spring. The bending stresses in the spring are reduced.
Claims16
Drive member for timepiece movement comprising:
- a barrel comprising a drum mounted on an arbor so that it can rotate with the arbor about an axis when the drive member is wound up;
- a main spring wound inside the barrel and able to be wound up around the arbor when the drive member is wound up, and a core coaxial with and pivoting on the arbor;
- the exterior end of the spring being coupled to the drum and the interior end of the spring being coupled to the core;
- wherein the exterior end of the spring is coupled to the drum by a first clamp that is pivot-mounted in the drum so that when the spring is unwound, the first clamp pivots in such a way as to hold the exterior turn of the first spring against the drum and when the spring is wound up, the first clamp pivots towards the center of the barrel to follow the exterior turn of the spring.
Method for assembling a drive member comprising a barrel comprising a drum mounted on an arbor so that it can rotate with the arbor about an axis when the drive member is wound up;
- a main spring wound inside the barrel and able to be wound up around the arbor when the drive member is wound up;
- and a core coaxial with and pivoting on the arbor;
- the exterior end of the spring being coupled to the drum by a first clamp that is pivot-mounted in the drum;
- and the interior end of the spring being coupled to the core;
- and
- wherein the core comprises a second clamp designed to fasten the interior end of the spring to the core;
- the method comprising the steps of:
- fastening the exterior end of the spring in the first clamp and fastening the interior end of the spring in the second clamp;
- winding up the spring in an external mainspring winder and inserting the wound-up spring into the drum;
- and placing the first clamp into the drum and the second clamp on the arbor.
Dependencies are inferred from the claim text.