Claims
- 1. A fastener, comprising:
a screw member including a first wrench engagement surface, a threaded portion and a support surface; and a securing ring including a second wrench engagement surface, a counterpart support surface facing said screw member and a contact surface being designed and arranged to transmit an axial force to a component in the mounted position of said fastener,
said securing ring being rotatably connected to said screw member, said support surface facing said securing ring, being designed and arranged to transmit an axial force to said securing ring and including a first taper-surface tooth arrangement being designed and arranged to be operative in both directions of rotation, and said counterpart support surface including a respective second taper-surface tooth arrangement being designed and arranged to be operative in both directions of rotation.
- 2. The fastener of claim 1, wherein said first and second taper-surface tooth arrangements are designed and arranged such that, when force acts on said screw member or on said securing ring in the unscrewing direction of said fastener, there is a securing action between said screw member and said securing ring, the securing action acting against a self-releasing effect of said fastener, and said screw member and said securing ring being screwed away from each other, increasing the axial force, and said first and second taper-surface tooth arrangements maintain their positively locking engagement upon joint tightening and joint unscrewing.
- 3. The fastener of claim 1, wherein said first and second taper-surface tooth arrangements each include a plurality of teeth, each of said teeth in the two circumferential directions including at least two form surfaces being designed and arranged to be inclined in the circumferential directions, said form surfaces which come into contact with each other in the unscrewing direction being designed and arranged with a comparatively small mean tangential angle to permit a sliding movement which rotates said screw member and said securing ring away from each other.
- 4. The fastener of claim 2, wherein said first and second taper-surface tooth arrangements each include a plurality of teeth, each of said teeth in the two circumferential directions including at least two form surfaces being designed and arranged to be inclined in the circumferential directions, said form surfaces which come into contact with each other in the unscrewing direction being designed and arranged with a comparatively small mean tangential angle to permit a sliding movement which rotates said screw member and said securing ring away from each other.
- 5. The fastener of claim 3, wherein said threaded portion has a helix angle, and wherein the effective tangential angle of said form surfaces which come into contact with each other in the unscrewing direction is only slightly greater than the helix angle of said threaded portion.
- 6. The fastener of claim 4, wherein said threaded portion has a helix angle, and wherein the effective tangential angle of said form surfaces which come into contact with each other in the unscrewing direction is only slightly greater than the helix angle of said threaded portion.
- 7. The fastener of claim 3, wherein said threaded portion has a helix angle, and wherein the effective tangential angle of said form surfaces which come into contact with each other in the unscrewing direction is up to approximately 20 percent greater than the helix angle of said threaded portion.
- 8. The fastener of claim 4, wherein said threaded portion has a helix angle, and wherein the effective tangential angle of said form surfaces which come into contact with each other in the unscrewing direction is up to approximately 20 percent greater than the helix angle of said threaded portion.
- 9. The fastener of claim 3, wherein said form surfaces are designed and arranged to symmetric.
- 10. The fastener of claim 3, wherein said form surfaces are designed and arranged to asymmetric.
- 11. The fastener of claim 3, wherein said form surfaces which come into contact with each other to achieve the sliding movement in the unscrewing direction are designed as non-flat surfaces extending in a threaded configuration.
- 12. The fastener of claim 1, wherein said first and second taper-surface tooth arrangements are designed and arranged such that the torque which can be transmitted by said first and second taper-surface tooth arrangements is less than the torque which can be transmitted between said securing ring and said component in the mounted position of said fastener.
- 13. The fastener of claim 1, wherein said contact surface is designed and arranged such that the torque which can be transmitted by said first and second taper-surface tooth arrangements is less than the torque which can be transmitted between said securing ring and said component in the mounted position of said.
- 14. The fastener of claim 1, wherein said first and second taper-surface tooth arrangements and said contact surface are designed and arranged such that the torque which can be transmitted by said first and second taper-surface tooth arrangements is less than the torque which can be transmitted between said securing ring and said component in the mounted position of said fastener.
- 15. The fastener of claim 13, wherein said contact surface has an increased level of friction.
- 16. The fastener of claim 14, wherein said contact surface has an increased level of friction.
- 17. The fastener of claim 15, wherein said contact surface includes at least one element taken from the group consisting of a plurality of ribs, bar-like projections, a friction-enhancing coating and a sand-blasted surface.
- 18. The fastener of claim 16, wherein said contact surface includes at least one element taken from the group consisting of a plurality of ribs, bar-like projections, a friction-enhancing coating and a sand-blasted surface.
- 19. The fastener of claim 1, wherein said contact surface has a larger frictional radius than said taper-surface tooth arrangements.
- 20. The fastener of claim 1, wherein said securing ring is arranged on said screw member to be captive but movable.
- 21. The fastener of claim 1, wherein said first and second wrench engagement surfaces are designed and arranged to be in mutually aligned relationship to be commonly operable with one wrench.
- 22. The fastener of claim 1, wherein said screw member and said securing ring are interconnected by a spot of adhesive.
- 23. The fastener of claim 1, wherein said screw member is a wheel screw.
Priority Claims (1)
Number |
Date |
Country |
Kind |
100 48 913.3-12 |
Oct 2000 |
DE |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of co-pending German Patent Application No. 100 48 913 entitled “Lösbares Verbindungselement für ein Bauteil, mit einem Schraubteil und einem Sicherungsring”, filed on Oct. 4, 2000.