Patent ID: 6935822

Claim:
A detachable fastener, comprising: a screw element including an engagement surface, a threaded portion, a supporting surface, a first wedge-shaped surface tooth arrangement being arranged at said supporting surface and first and second stop surfaces, said stop surfaces being designed not to be resilient; a securing ring being connected to said screw element, said securing ring including a counter supporting surface facing said supporting surface, a second wedge-shaped surface tooth arrangement being arranged at said counter supporting surface and first and second stop surfaces, said stop surfaces being designed not to be resilient; said supporting surface being designed and arranged to transmit an axial force onto said securing ring; said first and second wedge-shaped surface tooth arrangements being designed and arranged to face one another and to form sliding surfaces sliding upon one another along a sliding path in a loosening direction of rotation resulting in an increase of the axial force; said at least one first stop surface of said screw element and said at least one first stop surface of said securing ring being designed and arranged to form at least one first pair of stop surfaces, said at least one first pair of stop surfaces being designed not to be resilient and being designed and arranged to transmit torque in a tightening direction of rotation, said at least one first pair of stop surfaces being deigned and arranged to allow for movement of said sliding surfaces along the entire sliding path and to prevent movement of said sliding surfaces beyond the sliding path in the tightening direction of rotation; said at least one second stop surface of said screw element and said at least one second stop surface of said securing ring being designed and arranged to form at least one second pair of stop surfaces, said at least one second pair of stop surfaces being deigned not to be resilient and being designed and arranged to transmit torque in a loosening direction of rotation, said at least one second pair of stop surfaces being deigned and arranged to allow for movement of said sliding surfaces along the entire sliding path and to prevent movement of said sliding surfaces beyond the sliding path in the loosening direction of rotation; said stop surfaces of said at least one first and second pairs of stop surfaces being designed and arranged with a clearance between one another such that said first and second wedge-shaped surface tooth arrangements can slide upon one another without skipping.