Patent ID: 7703546
Filing Date: 2010-04-27
Classification: B25B

Abstract:
1. Pulse tool ( 1 ), in particular a pulse nutsetter, with a drive unit ( 2 ) and a pulse unit ( 3 ) driven by the drive unit ( 2 ), said pulse unit having at least one rotor ( 4 ) with at least two vanes ( 5 , 6 , 7 , 8 ), a hydraulic cylinder ( 9 ) surrounding the rotor ( 4 ) and a drive spindle ( 11 ) which protrudes at one end out of the hydraulic cylinder through a front plate ( 10 ), wherein the front plate ( 10 ) is arranged between the rotor ( 4 ) and a front cover ( 12 ) formed with a hydraulic fluid filling device ( 13 ), characterised in that the front plate ( 10 ) has at least one bypass opening ( 16 , 17 , 18 ) connecting a high-pressure and a low-pressure chamber ( 14 , 15 ) which are separated by the vanes ( 5 , 6 , 7 , 8 ), wherein two or more bypass openings ( 16 , 17 , 18 ) form a bypass opening group ( 20 , 21 , 22 , 32 ), and wherein the opening diameters ( 23 ) of each bypass opening ( 16 , 17 , 18 ) of a bypass opening group ( 20 , 21 , 22 , 32 ) are different.