Patent ID: 7445413
Filing Date: 2008-11-04
Classification: B25B,F16B,Y10S

Abstract:
1. A screw-nut assembly including an integrated, immediately effective securing arrangement for preventing unintentional loosening of a screwed connection formed thereby, comprising a first screw connection body and an associated second screw connection body, wherein one of the first and second screw connection bodies comprises a free-wheel mechanism connected thereto, a releasable coupling arrangement is provided between the free-wheel mechanism and the other one of the first and second screw connection bodies, the releasable coupling arrangement connects the free-wheel mechanism and the other one of the first and second screw connection bodies in a mutually non-rotatable manner when the coupling arrangement is in a blocked state and disconnects the free-wheel mechanism from the other one of the first and second screw connection bodies when the coupling arrangement is in a released state, the free-wheel mechanism is provided in such a manner that the screw connection bodies are rotatable in a direction of rotation (F) corresponding to the tightening of the screwed connection, when the coupling arrangement is in the blocked state, in the blocked state of the coupling arrangement the free-wheel mechanism blocks relative movement of the first and second screw connection bodies in a direction of rotation (L) corresponding to a loosening of the screwed connection, and in the released state of the coupling arrangement relative movement in the direction of rotation (L) corresponding to a loosening of the screwed connection is allowed, wherein the coupling arrangement comprises first coupling means and second coupling means, the first and the second screw connection bodies each comprise a respective axial boring, the free-wheel mechanism is arranged in the axial boring of the second screw connection body, a driver member is inserted into the axial boring of the first screw connection body in mutually non-rotatable manner, the free-wheel mechanism carries said first coupling means which co-operate with said second coupling means on the driver member and which are adapted to rotate in the direction of rotation (F) corresponding to the tightening of the screwed connection, the first coupling means and the second coupling means are formed in such a manner that they automatically engage with one another when tightening the screw connection bodies and create a mutually non-rotatable connection between the second screw connection body and the driver member, and an uncoupling device is provided in order to uncouple the coupling means from one another for the purposes of loosening the screwed connection.