Patent ID: 6095723
Filing Date: 2000-08-01
Classification: B23B,B23C,Y10T

Abstract:
An engraving tool comprising(a) a shaft portion (12) extending along an axis;(b) an end portion (16) extending from a base (14) at said shaft portion to a tip (18), said end portion (16) including(i) a pair of flutes (22), one on each side of said axis, extending from said base toward said tip (18), each of said flutes (22), in cross section, defining a concave curve,(ii) a pair of wall sections (24) between said flutes (22), each said wall section (24) being outwardly convex and tapering inwardly toward said axis in a direction extending from said base (14) toward said tip (18) and terminating at a line of juncture (26) spaced from said tip (18), and(iii) a wall section extension (28, 30) extending from each wall section (24) from said line of juncture (26) toward said tip (18), each said wall section extension including a first part (28) extending from said line of juncture (26), said first part (28) being so disposed that a cross section taken therethrough on a plane extending along said axis is at an angle in the range of 30.degree. to 50.degree. relative to a plane perpendicular to said axis and a second part (30) extending from said first part (28), said second part (30) being so disposed that a cross section taken therethrough on a plane extending along said axis is at an angle in the range of 10.degree. to 20.degree. relative to a plane perpendicular to said axis, each said second part (30) extending to a cutting edge (32), each said cutting edge (32) being disposed at an angle toward said axis, said cutting edges (32) lying substantially on the same plane extending along said axis, one of said second parts (30) lying on one side of said plane and the other of said second parts (30) lying on the other side of said plane.