Cycle wheel rim and method of manufacture
AssigneeMavic S.A.S.
InventorsBérenger Alexandre, Jean-Pierre Mercat
Life of this patent
Estimating the term…
Abstract
A method for manufacturing a cycle wheel rim having, in radial cross section, two lateral sidewalls and a bridge, the rim having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls. The manufacturing method includes extruding a section; bending the section; assembling the ends of the hoop formed from the section by joining one to the another; drilling holes in the bridge for fastening the spokes; machining the entire outer surface in a radial plane and on at least a portion of the circumference of the rim.
Claims19
A method for manufacturing a rim for a cycle wheel, the rim having a U-shaped radial cross section, with two lateral sidewalls and a bridge connecting the sidewalls to one another and positioned to be opposite an axis of rotation of the wheel, the rim having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls, the manufacturing method comprising:
- extruding a rectilinear section, the section comprising two lateral sidewalls and a bridge connecting the sidewalls to one another and positioned to be opposite an axis of rotation of the wheel, the section having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls;
- bending the section to form at least one hoop having two ends;
- assembling the ends of the hoop of the section to one another to define a circumference;
- drilling holes through the bridge for fastening the spokes of the wheel;
- after the drilling, machining at least one median zone of the outer surface of the bridge over at least 95% of the circumference of the rim, the median zone having a transverse width of greater than 4 mm measured perpendicular to a median plane of the rim;
- said machining comprising using a milling cutter having a concave profile and enabling the bridge and at least a portion of the sidewalls to be machined simultaneously in a radial plane.
A method for manufacturing a rim for a cycle wheel, the rim having a U-shaped radial cross section, with two lateral sidewalls and a bridge connecting the sidewalls to one another and positioned to be opposite an axis of rotation of the wheel, the rim having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls, the manufacturing method comprising:
- extruding a rectilinear section, the section comprising two lateral sidewalls and a bridge connecting the sidewalls to one another and positioned to be opposite an axis of rotation of the wheel, the section having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls;
- bending the section to form at least one hoop having two ends;
- assembling the ends of the hoop of the section to one another to define a circumference;
- drilling holes through the bridge for fastening the spokes of the wheel;
- after the drilling, machining at least one median zone of the outer surface of the bridge over at least 95% of the circumference of the rim, the median zone having a transverse width of greater than 4 mm measured perpendicular to a median plane of the rim;
- at the end of said extruding, a radius of curvature of the bridge of the section, measured in the radial plane of the rim, is greater than 20 mm;
- and
- at the end of said machining, a radius of curvature of the bridge of the rim is less than 15 mm.
A method for manufacturing a rim for a cycle wheel, the rim having a U-shaped radial cross section, with two lateral sidewalls and a bridge connecting the sidewalls to one another and positioned to be opposite an axis of rotation of the wheel, the rim having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls, the manufacturing method comprising:
- extruding a rectilinear section, the section comprising two lateral sidewalls and a bridge connecting the sidewalls to one another and positioned to be opposite an axis of rotation of the wheel, the section having an outer surface facing outward of the rim and defined by the bridge and by at least a portion of the sidewalls;
- bending the section to form at least one hoop having two ends;
- assembling the ends of the hoop of the section to one another to define a circumference;
- drilling holes through the bridge for fastening the spokes of the wheel;
- after the drilling, machining at least one median zone of the outer surface of the bridge over at least 95% of the circumference of the rim, the median zone having a transverse width of greater than 4 mm measured perpendicular to a median plane of the rim;
- at the end of said extruding, a radius of curvature of the bridge of the section, measured in the radial plane of the rim, is greater than 20 mm;
- and
- at the end of said machining, a radius of curvature of the bridge of the rim is less than 10 mm.
Dependencies are inferred from the claim text.