A DRILL BIT FOR A PERCUSSIVE HAMMER AND SHANK THEREFORE

摘要

This invention relates to a bit (1) for a percussive hammer and shank therefore. The bit comprises an elongated shank (2) a head (4) at a first end of the shank (2) and an array of lengthwise extending spline portions defining outwardly extending retention lugs (20) at or toward a further end of the shank (2). At least a side face (30) of at least one lug (20) is blended into the shank (2) of the bit (1).