Patent ID: 8608530

Claim:
An insertion tool ( 12 ) for a machine tool, wherein the insertion tool ( 12 ) has a hub ( 16 ) with at least one opening ( 42 , 80 ) for insertion of a fastening means ( 40 , 84 ), wherein the hub ( 16 ) is clampable by means of the fastening means ( 40 , 84 ) on a driving flange ( 22 ) connected to a drive shaft of the machine tool, the opening ( 42 , 80 ) including a retaining region ( 54 ) and a releasing region ( 56 ), the releasing region ( 56 ) including a stop ( 66 , 88 ) for limiting a release motion of the fastening means ( 40 , 84 ) wherein the opening ( 42 , 80 ) has a convex section ( 76 , 90 ) adjacent to the stop ( 66 , 88 ) and with a rear region ( 76 , 90 ) which is realized due to the convex section ( 76 , 90 ) and which is arranged in a release direction ( 64 ) behind the stop ( 66 , 88 ).