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US 8,485,719 B2Granted
Pivot organ
AssigneeComplitime SA
InventorsRobert Greubel, Stephen Edward Methuen Forsey
Life of this patent
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AssigneeComplitime SA
InventorsRobert Greubel, Stephen Edward Methuen Forsey
Estimating the term…
A pivot organ (5a, 5b) designed to allow the rotation of a piece (3) of a clockwork movement around an axis of rotation, includes two elements: a pivot (7a, 7b) and a bearing (6a, 6b) receiving the pivot (7a, 7b), one being integral with the piece (3) and the other being integral with the frame (1) of the movement. The elements (6a, 6b, 7a, 7b) have shapes at their opposite surfaces such that the section of one of the elements along a plane perpendicular to the axis of rotation is circular, the section of the other element along the plane being non-circular, so as to reduce the contact surface between the pivot (7a, 7b) and the bearing (6a, 6b). At least the contact surfaces of the two elements against each other are made from at least one material intrinsically having a low coefficient of friction and a low wear coefficient.
A pivot organ designed to allow the rotation of a piece of a clockwork movement around an axis of rotation AA, comprising two elements, i.e. a pivot and a bearing receiving said pivot, one of said elements being arranged to be integral with said piece and the other being arranged to be integral with a frame of said movement, said elements having, at their opposite surfaces, shapes such that the section of one of the elements along a plane perpendicular to the axis of rotation AA is circular, the cross-section of the other element along said plane being non-circular, so as to reduce the contact surface between the pivot and the bearing, wherein at least the contact surfaces of the two elements against each other are made from at least one material ensuring its own lubrication, having a coefficient of friction less than or equal to 0.1 and a hardness greater than or equal to 9 on the Mohs scale.
A piece of a clockwork movement, comprising at least one pivot organ designed to allow the rotation of said piece around an axis of rotation AA, said pivot organ comprising two elements, i.e. a pivot and a bearing receiving said pivot, one of said elements being arranged to be integral with said piece and the other being arranged to be integral with a frame of said movement, said elements having, at their opposite surfaces, shapes such that the section of one of the elements along a plane perpendicular to the axis of rotation AA is circular, the cross-section of the other element along said plane being non-circular, so as to reduce the contact surface between the pivot and the bearing, wherein at least the contact surfaces of the two elements against each other are made from at least one material ensuring its own lubrication, having a coefficient of friction less than or equal to 0.1 and a hardness greater than or equal to 9 on the Mohs scale.
Dependencies are inferred from the claim text.