초록 ▼

The invention relates to a tool (1), in particular an impact wrench, with a pulse unit (6) having a hydraulic impact mechanism (7) and a drive unit (24). The working volume (5) can be connected within the hydraulic impact mechanism (7) to an additional volume (4) formed outside of the mechanism. The

The invention relates to a tool (1), in particular an impact wrench, with a pulse unit (6) having a hydraulic impact mechanism (7) and a drive unit (24). The working volume (5) can be connected within the hydraulic impact mechanism (7) to an additional volume (4) formed outside of the mechanism. The tool according to the invention is characterised in that at least the compensating volume (4) can be varied independently of the pressure.

대표청구항 ▼

The invention claimed is: 1. Tool (1), in particular an impact wrench, with a pulse unit (6) having a hydraulic impact mechanism (7) and a drive unit (24), wherein a working volume (5) within the hydraulic impact mechanism (7) can be connected to an additional volume (4) formed outside of the hydra

The invention claimed is: 1. Tool (1), in particular an impact wrench, with a pulse unit (6) having a hydraulic impact mechanism (7) and a drive unit (24), wherein a working volume (5) within the hydraulic impact mechanism (7) can be connected to an additional volume (4) formed outside of the hydraulic impact mechanism, wherein the additional volume (4) has setting means (2) comprising a manually adjustable piston (2) that limits one end of the additional volume (4) characterised in that, at least the additional volume (4) can be varied independently of a pressure of a working fluid. 2. Tool (1) according to claim 1, characterised in that the hydraulic impact mechanism (7) is arranged between the drive unit (24) and a tool holder (25). 3. Tool (1) according to claim 1, characterised in that the additional volume (4) can be enlarged and reduced by the setting means (2). 4. Tool (1) according to claim 1, characterised in that the piston (2) can be set via an external and/or internal thread relative to the hydraulic cylinder (11). 5. Tool (1) according to claim 4, characterised in that the hydraulic cylinder (11) has at least four fixable rotary positions (16) which are arranged offset, in particular by 90°. 6. Tool (1) according to claim 4, characterised in that the piston (2) has an internal thread, which can be screwed onto an external thread of the hydraulic cylinder (11). 7. Tool (1) according to claim 1, characterised in that the additional volume (4) is arranged between the hydraulic cylinder (11) and the piston (2). 8. Tool (1) according to claim 7, characterised in that the piston (2) has an outer limb profile which forms a chamber (3) and (4) with the hydraulic cylinder (11) for reserve oil and compensating oil. 9. Tool (1) according to claim 1, characterised in that the piston (2) is manufactured from a resilient, stiff and low-mass material, in particular hard anodised aluminium. 10. Tool (1) according to claim 1, characterised in that the piston (2) is sealed relative to the hydraulic cylinder (11) with O-ring seals (13, 14). 11. Tool (1) according to claim 1, characterised in that the piston (2) can be fixed in at least one rotary position (16). 12. Tool (1) according to claim 11, characterised in that the piston (2) is fixed in at least one rotary position (16) relative to the hydraulic cylinder (11). 13. Tool (1) according to claim 12, characterised in that the piston (2) is fixed in at least one rotary position (16) relative to the hydraulic cylinder (11) by means of a locking element (15). 14. Tool (1) according to claim 13, characterised in that the locking element (15) is a pin, sleeve or threaded stud. 15. Tool (1) according to claim 13, characterised in that the piston (2) has at least one receptacle opening or groove for the locking element (15). 16. Tool (1) according to claim 13, characterised in that the piston (2) can be fixed relative to the hydraulic cylinder (11) with the locking element (15) after setting the pulse rate. 17. Tool (1) according to claim 1, characterised in that the piston (2) can be rotated with an auxiliary tool to change the volume. 18. Tool (1) according to claim 1, characterised in that the piston (2) has an essentially L-shaped profile. 19. Tool (1) according to claim 1, characterised in that the piston (2) has two cylindrical internal diameters of different size. 20. Tool (1) according to claim 19, characterised in that at least one of the internal diameters of the piston (2) has a groove for an O-ring seal (13, 14). 21. Tool (1) according to claim 19, characterised in that at least one of the internal diameters of the piston (2) has a mounting surface for an O-ring seal (13, 14). 22. Tool (1) according to claim 1, characterised in that the reserve oil, the oil compensating volume and the increase in pulse frequency can be set simultaneously with the piston (2).