Back to results
US 10,365,608 B2Granted
Timepiece wheel set
AssigneeETA SA Manufacture Horlogere Suisse
InventorOlivier Mertenat
Life of this patent
Estimating the term…
Abstract
A timepiece wheel set, including an arbor including a housing for reception of a plate and including, on either side of the housing, an axial abutment surface maintained in abutment on the plate, which includes a radially resilient arm and a second arm forming together a clamp clamping a radial bearing surface of the arbor in proximity to the axial abutment surface. The arbor further includes an entry ramp arranged to push back radially the first resilient arm and the second resilient arm, to allow the plate to be placed on the arbor.
Claims21
A timepiece wheel set in plural parts, the wheel set comprising:
- a first component including an arbor which includes, about a first pivot axis, a housing arranged for reception of a second component including a plate in a single axial position, the plate including a peripheral surface with respect to a second pivot axis, the arbor comprising, on either side of the at least one housing, in a direction of the first pivot axis, an axial abutment surface arranged to maintain the plate in abutment on the arbor,
- wherein the plate comprises at least a first arm, resilient radially with respect to the second pivot axis, and at least a second arm that is stiff or resilient radially with respect to the second pivot axis, the first resilient arm and second arm together forming a clamp arranged to clamp a radial bearing surface in the arbor in proximity to the axial abutment surface,
- wherein the arbor further comprises an entry ramp arranged to push back radially each first resilient arm and, when included in the plate, each second resilient arm, to allow the plate to be placed on the arbor,
- wherein each first arm or second arm includes one curved surface, formed by a substantially cylindrical sector, of hollow elliptical section, whose sector axis is off-center with respect to the second pivot axis, the sector axis is farther from the substantially cylindrical hollow section than the second pivot axis, by an offset value between 0.1 and 0.2 times the radius of the substantially cylindrical hollow sector,
- wherein the radial bearing surface and the entry ramp of the arbor define together a flange arranged to immobilize the plate on the arbor when the plate is in abutment on the axial abutment surface of the arbor,
- wherein the radial bearing surface having a clearance angle with respect to the flange, and wherein the plate bears on the arbor at four points, in symmetrical pairs with respect to the first pivot axis,
- wherein the arbor further comprises, for reception of the plate, a radial bearing surface with a clearance angle under a flange, by an angle between 2° and 8°, and
- wherein the plate further comprises a lower surface which forms an axial abutment surface and is in abutment on a radial surface of the arbor orthogonal to the axis of the arbor, on an annular surface delimited by an inner circle and an outer circle, the plate being, in an assembled position on the arbor, in contact with the arbor on a surface substantially reduced to a circle, on the radial bearing surface, projection of the circle, parallel to the axis of the arbor, on the radial bearing surface, being located between the inner circle and the outer circle, and coinciding with the inner circle.
5 more elements
A timepiece wheel set in plural parts, the wheel set comprising:
- a first component including an arbor which includes, about a first pivot axis, a housing arranged for reception of a second component including a plate in a single axial position, the plate including a peripheral surface with respect to a second pivot axis, the arbor comprising, on either side of the at least one housing, in a direction of the first pivot axis, an axial abutment surface arranged to maintain the plate in abutment on the arbor,
- wherein the plate further includes a first arm, resilient radially with respect to the second pivot axis, and a second arm that is stiff or resilient radially with respect to the second pivot axis, the first arm linking a first part of a periphery of the plate and a second part of the periphery, the second arm linking a third part of the periphery and a fourth part of the periphery, the first resilient arm and second arm together forming a clamp arranged to clamp a radial bearing surface included in the arbor in proximity to the axial abutment surface,
- wherein the arbor further comprises an entry ramp arranged to push back radially each first resilient arm and, when included in the plate, each second resilient arm, to allow the plate to be placed on the arbor,
- wherein the first resilient arm and the second resilient arm surround the arbor in a curved manner on either side of the second pivot axis, in proximity with a contour of the arbor, and
- wherein the plate bears on the arbor simultaneously at four contact points on the first arm and the second arm.
2 more elements
A timepiece wheel set in plural parts, the wheel set comprising:
- a first component including an arbor which includes, about a first pivot axis, a housing arranged for reception of a second component including a plate in a single axial position, the plate including a peripheral surface with respect to a second pivot axis, the arbor comprising, on either side of the at least one housing, in a direction of the first pivot axis, an axial abutment surface arranged to maintain the plate in abutment on the arbor,
- wherein the plate further includes a first arm, resilient radially with respect to the second pivot axis, and a second arm that is stiff or resilient radially with respect to the second pivot axis, the first resilient arm and second arm together forming a clamp arranged to clamp a radial bearing surface included in the arbor in proximity to the axial abutment surface,
- wherein the arbor further comprises an entry ramp arranged to push back radially each first resilient arm and, when included in the plate, each second resilient arm, to allow the plate to be placed on the arbor,
- wherein the first resilient arm and the second resilient arm surround the arbor in a curved manner on either side of the second pivot axis, in proximity with a contour of the arbor, and
- wherein the plate bears on the arbor at only four contact points,
- wherein each first arm or second arm comprises one curved surface, formed by a substantially cylindrical sector, of hollow elliptical section, whose sector axis is off-center with respect to the second pivot axis, and wherein the sector axis is farther from the substantially cylindrical hollow section than the second pivot axis, by an offset value between 0.1 and 0.2 times the radius of the substantially cylindrical hollow sector,
- wherein the radial bearing surface and the entry ramp of the arbor define together a flange arranged to immobilize the plate on the arbor when the plate is in abutment on the axial abutment surface of the arbor,
- wherein the radial bearing surface has a clearance angle with respect to the flange, and
- wherein the plate bears on the arbor at four points in symmetrical pairs with respect to the first pivot axis.
6 more elements
Dependencies are inferred from the claim text.