Patent ID: 6263771
Filing Date: 2001-07-24
Classification: B25B,Y10S

Abstract:
A polygonal screwing tool for a polygonal-socket, comprising:a plurality of flanks arranged circumferentially around a work end of the tool and adjoining one another in a configuration approximating an encircling polygon, the flanks adjoining one another at corners of the polygon; andwherein, proceeding circumferentially around the tool, each of the flanks has a central concave section disposed between two outer convex sections which extend to opposed edges of the flank, each of the convex sections having a curvature about radii of differing length such that a shorter-radius of curvature defines a portion of the convex section contiguous to the central concave section and a longer radius of curvature defines a portion of the convex section contiguous an edge of the flank.