Patent EA-004360-B1 (EA)
Title: Nut
Inventor: GEIHL ARNO
IPC: F16B37/08
Filed: 2001-05-16
Abstract: 1. Nut (10), with: - an outer body (16), which has an axial port (22); - and inner body, which is movably accepted in the port (22) in an axial direction, has an axial internal thread and is divided into at least two jaws (18, 20) in an axial direction, which jaws bear an internal thread segment (24) on their radially inner surface and which, when the outer body (16) is moved relative to the inner body in the loosening direction of the nut (10) are moved apart; - initial guide means (26) provided on the outer body (16); and - second guide means (30) provided on the jaws (18, 20) and interact with the initial guide means (26) such that the jaws (18, 20) are closed, when the outer body (16) is moved relative to the inner body in the loosening direction of the nut (10), characterised in that the closed jaws (18, 20) have at least one portion (19) with a constant cross section and a second portion (21) with a cross section (Fig.11) extending in the nut (10) tightening direction. 2. Nut (10) according to Claim 1, characterised in that the second portion (21) has an extending cross section (Fig.11) with a constant incline at least straight angle to the jaws' jointing plane in the nut (10) tightening direction. 3. Nut (10) according to Claim 1 or 2, characterised in that the first portion (19) is provided in the nut (10) tightening direction, followed by the second portion (21), after it the first portion (19), then again second portion (21), and again the first portion (19) (Fig.11). 4. Nut (10) according to Claim 1 to 3, characterised in that the second guide means (30) interact with the initial guide means (26) such that the jaws (18, 20), when the outer body (16) is moved relative to the inner body in the loosening direction, are pushed radially outwards and, when the outer body (16) is moved in the tightening direction relative to the inner body, are pushed radially inwards. 5. Nut according to one of the preceding claims, characterised in that the second guide means comprise grooves (30), which run in the lateral surfaces of the jaws (18, 20) and move away from the axis (A) in the tightening direction, and in that the initial guide means comprise noses (26), which project from the port (22) and run in the grooves (30). 6. Nut according to one of the preceding claims, characterised in that on each jaw (18, 20) an outer wedge surface (36), which moves away from the axis (A) in the tightening direction, and at the port (22) for each jaw (18, 20) an inner wedge surface (34) is provided, which, corresponding to the assigned, outer wedge surface (36) moves away from the axis (A) in the tightening direction. 7. Nut according to one of the preceding claims, characterised in that the jaws (18, 20) are pre-stressed radially outwards. 8. Nut according to one of the preceding claims, characterised in that a locking pin (40) is movably guided transversally to the axis (A) through the outer body (16) and in its locking position with its inner end abuts a locking surface (42), which is provided at least one jaw (18) transversally to the axis (A) pointing in the tightening direction, and in its release position can be moved with its inner end past this locking surface (42) and together with the outer body (16) in the loosening direction. 9. Nut according to Claim 8, characterised in that the outer end of the locking pin (40) in the locking position projects from the outer peripheral surface of the outer body (16) and the inner end of the locking pin (40) and the locking surface (42) are formed such that the locking pin (40) can be brought out of the locking position into the release position by pressing in. 10. Nut according to Claim 8 or 9, characterised in that the locking pin (40) is pre-stressed into the locking position.