Anchoring element
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.