Anchoring element

Abstract

An anchoring element with a screw ( 12 ) comprising a threaded section ( 13 ) and a head ( 15 ) designed as a spherical segment-shaped section, and with a receiving portion ( 1 ) for connecting the screw ( 12 ) to a rod ( 19 ), is provided. The receiving portion ( 1 ) comprises a first end ( 2 ) and a second end ( 3 ) opposite the latter and a longitudinal axis ( 4 ) passing through the two ends ( 2, 3 ). The receiving portion further comprises a bore ( 5 ) coaxial with the longitudinal axis ( 4 ), a first region adjoining the first end ( 2 ) with an essentially U-shaped cross-section ( 18 ) with two free arms ( 8, 9 ) comprising a thread for receiving the rod ( 19 ) to be inserted, a region adjoining the other end ( 3 ) for receiving the head ( 15 ), and an element which exerts pressure on the rod ( 19 ) or on the head ( 15 ). In order that the screws can be used in situ for very different lengths, the threaded section ( 13 ) and the head ( 15 ) are designed as separate parts.

1 . Anchoring element with a screw ( 12 ) comprising a threaded section ( 13 ) and a head ( 15 ) designed as a spherical segment-shaped section, and with a receiving portion ( 1 ) for connecting the screw ( 12 ) to a rod ( 19 ), wherein the receiving portion ( 1 ) comprises a first end ( 2 ) and a second end ( 3 ) opposite the latter, a longitudinal axis ( 4 ) passing through the two ends ( 2 ,  3 ), a bore ( 5 ) coaxial with the longitudinal axis ( 4 ), a first region adjoining the first end ( 2 ) with an essentially U-shaped cross-section ( 7 ) with two free arms ( 8 ,  9 ) comprising a thread for receiving the rod ( 19 ) to be inserted, a region adjoining the other end ( 3 ) for receiving the head ( 15 ), and an element ( 22 ,  17 ) which exerts pressure on the rod ( 19 ) or on the head ( 15 ), characterised in that the threaded section ( 13 ) and the head ( 15 ) are designed as separate parts.  
   
   
       2 . Anchoring element according to  claim 1 , characterised in that the threaded section ( 13 ) comprises a shank ( 14 ) at the head end.  
   
   
       3 . Anchoring element according to  claim 1  or  2 , characterised in that the head ( 15 ) comprises a spring-yielding edge on its side facing towards the threaded section ( 13 ).  
   
   
       4 . Anchoring element according to any of  claims 1  to  3 , characterised in that the edge ( 34 ) facing towards the threaded action comprises one or more apertures or recesses ( 28 ,  29 ,  33 ) which are directed parallel to the axis of symmetry ( 4 ) and distributed circumferentially.  
   
   
       5 . Anchoring element according to  claim 4 , characterised in that an aperture ( 33 ) extends over the whole wall length, seen in a direction parallel to the axis of symmetry ( 4 ).  
   
   
       6 . Anchoring element according to any of  claims 1  to  5 , characterised in that the head ( 15 ) comprises a bore ( 27 ) coaxial with the axis of symmetry.  
   
   
       7 . Anchoring element according to  claim 6 , characterised in that the bore ( 27 ) is cylindrical.  
   
   
       8 . Anchoring element according to any of  claims 2  to  7 , characterised in that the shank ( 14 ) comprises a rough surface.  
   
   
       9 . Anchoring element according to any of  claims 2  to  8 , characterised in that the shank ( 14 ) is polygonal.  
   
   
       10 . Anchoring element according to any of  claims 1  to  6 , characterised in that the head ( 15 ) comprises an internal thread in the bore and the shank ( 35 ) comprises an external thread mating therewith.  
   
   
       11 . Anchoring element according to any of  claims 1  to  6 , characterised in that the head ( 15 ) is corrugated in the circumferential direction in the bore and the shank ( 37 ) comprises a corresponding corrugation on its outer side.