US 6,981,496 B2
Point chisel
Jozsef Szendrovari, Kecskemet (Hungary); Werner Britten, Landsberg (Germany); and Jozsef Varga, Kecskemet (Hungary)
Assigned to Hilti Aktiengesellschaft, Schaan (Liechtenstein)
Filed on Sep. 23, 2003, as Appl. No. 10/670,066.
Prior Publication US 2004/0069292 A1, Apr. 15, 2004
Int. Cl. B28D 1/26 (2006.01)
U.S. Cl. 125—41 11 Claims
OG exemplary drawing
 
1. A point chisel for use with a power tool, comprising a power tool side formed as a shank (2) for securing the chisel to the power tool; and a workpiece side adjoining the power tool side and forming working region having a cross-section inscribed in a circle (3) being provided at a workpiece end thereof with a chipping tip (3′) and having a core along an entire longitudinal extent thereof, the working region (3) having an outer diameter (H) tapering along a substantially entire axial extent thereof toward the workpiece end thereof and having a cross-section (5) formed as a concave polygon by a plurality of axial grooves (4) extending axially over substantially the entire longitudinal extent of the working region and up to the chipping tip (3′) and radially toward the core of the working region, wherein a core diameter (K) likewise tapers toward the workpiece end of the working region (3) along a substantially entire axial extent of the core, whereby cross-sectional surfaces of the cross-section (5) of the working region are similar in different cross-sectional locations (I, II, III, IV, V) of the working region.