Meco Sa

Omega Sa

Pierre-Jean Bonnet

Jean-Claude Monachon

Georges Zimmermann

Winding crown for a timepiece, said crown () including a bottom () and a skirt (), which delimits an inner volume housing at least one elastically deformable element, the crown () being characterized in that a stop member is inserted between the elastically deformable element () and the bottom () of the crown () to prevent any surface contact between said elastically deformable element () and said bottom ().

Winding crown for a timepiece

Winding crown for a timepiece, said crown () including an uncoupling mechanism () comprising a rigid drive ring () secured to the crown () and cooperating with at least one elastically deformable element () secured to a pipe () to one end of which a winding stem is secured, the rigid ring () driving the deformable elastic element () in at least one rotational direction until the resistant torque opposed by said elastic element () exceeds a threshold value beyond which said elastic element () is deformed so as to interrupt the drive connection thereof with the rigid ring (), the elastically deformable element () therefore having means for temporary coupling said element to said rigid drive ring (), the crown ()) being characterized in that the elastically deformable element () includes means for centering said element relative to the rigid drive ring ().

Timepiece crown including an uncoupling mechanism

The middle part includes an inner metallic middle part () and an outer middle part () made of a natural or synthetic mineral material, such as ceramics. The inner middle part () is itself made up of a top ring () and a bottom ring (), each ring including a radial, peripheral extension (), whose opposite shoulders can mechanically lock the outer middle part (), for example by screwing the two rings () one inside the other.

Watch case with a composite middle part

Winding crown for a timepiece, said crown () including an uncoupling mechanism () comprising a rigid drive ring () secured to the crown () and cooperating with at least one elastically deformable element () secured to a pipe () to one end of which a winding stem is secured, the rigid ring () driving the deformable elastic element () in at least one rotational direction until the resistant torque opposed by said elastic element () exceeds a threshold value beyond which said elastic element () is deformed so as to interrupt the drive connection thereof with the rigid ring (), the elastically deformable element () therefore having means for temporary coupling said element to said rigid drive ring (), the crown ()) being characterized in that the elastically deformable element () includes means for centring said element relative to the rigid drive ring ().

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Courtelary, Switzerland

Pierre-Jean Bonnet