Patent ID: 7055633
Filing Date: 2006-06-06
Classification: B23B,B28D,E21B

Abstract:
1. A concrete drill for a rotary and percussively driven hand tool machine comprising a cutting part ( 1 ) and a striking part ( 2 ) axially limited displaceable relative to the cutting part ( 1 ), the cutting part ( 1 ) and the striking part ( 2 ) each have at their facial surfaces work zones for working a bore hole surface ( 7 ), wherein the respective facial surface work zones of the cutting part ( 1 ) and the striking part ( 2 ) radially overlap upon rotation of the concrete drill, wherein, in an axial intermediate position of the striking part ( 2 ), the cutting part ( 1 ) and the striking part ( 2 ) upon rotation of the concrete drill form a common mantle head surface ( 6 ) at a head-end leading end of the striking part ( 2 ) and the cutting part ( 1 ), and wherein two striking segments ( 2 a , 2 b ) and at least two cutting segments ( 1 a , 1 b ) are nested in each other in a transverse plane, at least at the head end leading end of the striking part ( 2 ) and the cutting part ( 1 ).