Patent ID: 8322952

Claim:
A bore head, comprising: a body ( 1 ) equipped with a radial piston ( 2 ) for receiving a bore tool ( 3 ), which can be tightened in said radial piston ( 2 ) with a tightening means ( 4 ), where the position of said radial piston ( 2 ) can be regulated by means of a micrometric screw ( 5 ), and where the radial piston is guided and tightened in the regulation position with a guidance and tightening means ( 6 , 6 ′), and where, moreover, said body is provided with a balancing device ( 7 ) with balancing weights ( 8 and 9 ), wherein the means ( 4 ) for tightening the bore tool ( 3 ) in the radial piston ( 2 ) of the body ( 1 ) is in the form of a screwing device ( 10 ), which is equipped with a movable center punch ( 11 ) under tension caused by a spring ( 12 ), and in that the means ( 6 , 6 ′) for guidance and tightening in the regulation position of the radial piston ( 2 ) is an indirect tightening means, which acts radially against the radial piston.