Patent ID: 6517301
Filing Date: 2003-02-11
Classification: F16B

Abstract:
A detachable fastener assembly for a wheel of a vehicle, comprising:a screw element including a threaded portion, a first supporting surface and a number of first wedge shaped teeth being located at said supporting surface; and a supporting ring being rotatably connected to said screw element, said first supporting surface being designed and arranged to transmit an axial force to said supporting ring, said supporting ring including a second supporting surface, a non-planar bearing surface being designed to transmit an axial force onto a wheel of a vehicle in the mounted position and a number of second wedge shaped teeth being associated with said first wedge shaped teeth, said first wedge shaped teeth each including a first form surface and a second form surface and being located at said first supporting surface to face said supporting ring and said second wedge shaped teeth each including a first form surface and a second form surface and being located at said second supporting surface to face said screw element, said first and second form surfaces being inclined in a circumferential direction, said second form surfaces being designed to be at least partially non-planar, said first form surfaces of said first and second teeth contacting each other and being arranged at a relatively great average tangent angle to realize positive engagement between said screw element and said supporting ring in a tightening sense of rotation when said fastener assembly is being tightened and said second form surfaces of said first and second teeth contacting each other and being arranged at a relatively small average tangent angle to make said first and second wedge shaped teeth slide on one another and to press said screw element and said supporting ring apart under an increase of the axial force in a tightening sense of rotation when said fastener assembly is being loosened.