Patent ID: 7824135

Claim:
Drill ( 4 ) with a drill head ( 5 ) with a diameter D ( 51 ), in which the drill head ( 5 ) on a drill tip ( 13 ) has only one cutting edge ( 52 ) extending over part of the diameter D ( 51 ), and with a lateral, V-shaped chip removing groove or bead ( 59 ) and with a channel ( 12 ) with an outlet opening ( 56 ) in the drill head ( 5 ) for supplying a drill fluid ( 9 ), wherein on a drill side ( 61 ) of the drill head ( 5 ) facing away from the bead ( 59 ) between a first and a second cylinder casing part surface ( 64 , 65 ) of the drill head ( 5 ) there is a rear offset ( 63 ) reducing the cross section of the drill head ( 5 ) relative to an enclosing cylinder casing surface ( 62 ) of the drill head ( 5 ), whereby the rear offset ( 63 ) is designed to have an at least approximately even surface and is arranged in an end section ( 74 ) of the drill head ( 5 ) facing the drill tip ( 13 ), and extends in axial direction, and whereby a normal to the surface ( 67 ) of the rear offset ( 63 ) with an angle halving end ( 68 ) of the bead ( 59 ) encloses an angle ( 69 ), whereby said angle ( 69 ) has a value from a range of −50° to +50°, wherein a second outlet opening ( 76 ) is arranged in a surface area ( 77 ) of the drill head ( 5 ) formed by the rear offset ( 63 ).