Patent ID: 6213885
Filing Date: 2001-04-10
Classification: B21H,B21K,F16B

Abstract:
A method for fabricating a wheel nut having a longitudinal axis for separably fastening a wheel to a vehicle, the method comprising the steps of:(a) forming a substantially sleeve-like clamping section spaced apart from a flange using a solid reshaping operation including at least one of hot and cold-extrusion, hot and cold forming, hot and cold heading and molding, wherein the flange includes a side, and the sleeve-like clamping section includes an external surface and an internal surface;(b) forming a torque receiving section using a solid reshaping operation, with the torque receiving section being coaxial with the sleeve-like clamping section and disposed between the flange and the sleeve-like clamping section, wherein the side of the flange faces away from the torque receiving section and the sleeve-like clamping section and being engageable with an object in response to rotation of the wheel nut around an externally threaded fastener;(c) forming a plurality of annular recesses in the sleeve-like clamping section using a material removal operation, wherein the plurality of recesses extend substantially parallel to the common longitudinal axis, the plurality of recesses being narrower than the portions of the clamping section adjacent to the recesses; and(d) flexing the sleeve-like clamping section towards the longitudinal axis, such that the internal surface forms a conical frustum;(e) forming a substantially cylindrical internal thread in the torque receiving section and an at least partially conical internal thread by another material removal operation in a final operation;(f) cutting, in a final step, a conical internal thread in the conically shaped sleeve-like clamping section; and(g) the conical shaped sleeve-like clamping section being unthreaded prior to the final step.