Abstract: A shank for a working tool has at least three recesses (5) provided within the lockable region (3) and arranged in a cross-section IgIc) to the tool axis (A) at least at angles of 0°, 120°, and 240° within the radial reference dimension (R) of the shank, with at least one of the recesses (5) being axially closed toward a free end of the shank (1), and at least one protrusion (6) arranged circumferentially between two adjacent recesses (5) outside of the radial reference dimension, with the sum of central recess angles (?) of the recesses amounting to at least 150°, and a central protrusion angle (?) of the at least one protrusion (6) being smaller than a central recess angle (?).

Abstract: A point chisel for use with a power tool includes an elongate stem (1) having, at its power tool side a shank (2) for securing the chisel in the power tool and, at its workpiece side, a useful region (3) having its outer diameter (H) tapering toward its workpiece end and having a cross-section (5) formed as a concave polygon by a plurality of axial grooves (4) extending radially toward a core diameter (K) that likewise tapers toward the workpiece side end of the useful region (3).

Abstract: A shank for a rotary and percussive tool has a locking groove (3) arranged between two guided regions (1a, 1b) and axially closed at its opposite ends for receiving at least one radially displaceable and axially displaceable, within predetermined limits, locking member (4) of a chuck in which the shank is received, with the guide dimension (F) of the guide region being smaller than the width (B) of the axial region (A) of the locking groove (3) and that includes the radial extent of an entrain strip (2) provided in that region (A), and greater than the thickness (D) of the axial region measured in a direction transverse to the width measurement direction.

Abstract: A guide assembly (1) for a core drill bit (2), which is at least partially guided at an inner wall (3) of the core drill bit (2) and projects radially with projections (10) between the plurality of cutting inserts (5) arranged on a frontal surface of the drill tube (4) of the core drill bit (2), wherein a centering means (6) projects at least axially, in part, beyond the cutting inserts (5), whereby the centering means (6) is shorter than the axial length (L) of the drill tube (4), and is axially spring-biased inside the guide assembly (1) and has limited axial displacement.

Abstract: A core drill bit (1) for working brittle material has an axially extending tubular shaft (2) with a rotation driver (4) coaxially fitted to a trailing end portion (3a) and a plurality of had material inserts (5a, 5b) arranged on the opposite open leading end portion (3b), which are formed with a defined cutting edge, whereby each individual hard material insert (5a, 5b) is fitted on precisely one intermediate carrier members (6a, 6b) associated therewith, which is fitted on the leading open end portion (3b) of the tubular shaft (2).