Patent ID: 6931975

Claim:
A circular saw blade comprising: a generally circular blade portion having a width and a central plane through the centre of the width of the blade portion and being parallel to the opposing sides of the blade; a plurality of spaced apart teeth attached to the circular blade portion, each tooth having a width and each tooth extending outwardly and upwardly from the circular blade portion, having a leading edge, a leading plane and a dimple formed therein proximate to the leading edge, the dimple having a dimple leading edge, a dimple leading edge plane, a top upwardly curved portion and a surface that is shaped inwardly from the top curved portion forming a curved plane and the tooth having a positive rake defined by the dimple; a curved cutting edge defined by the leading edge of the tooth and the dimple leading edge; and a top cutting angle is defined by the tooth leading plane and the dimple leading edge plane, the top cutting angle varies along the width of the tooth, the angle increasing to a maximum as it approaches the central plane from opposed sides of the circular blade portion, the tooth leading plane being generally constant along the width of the tooth and the dimple leading edge plane varying along the width of the tooth such that a first too cutting angle taken adjacent to one of the opposed sides of the circular blade portion and parallel to the central plane is less than second top cutting angles taken spaced more closely to and parallel to the central plane and wherein the positive rake is provided by the variable top cutting angle.