Patent ID: 7437977
Filing Date: 2008-10-21
Classification: B25B

Abstract:
1. A hand tool, comprising: a main body provided with a mounting portion including a plurality of arcuate protruding faces and a plurality of receiving recesses located between the protruding faces; wherein, each of the receiving recesses of the mounting portion has an arc-shaped corner; a first distance is defined to be a distance between two walls of each recess, where the two wall facing to each other; and a second distance is defined to be a distance from a top to a bottom of each arcuate protruding face; and a third distance D is defined to be a distance between two ends of a bottom side of the arcuate protruding face; then a proportion of the first distance to the second distance is 1:1.6 and a proportion of the third distance to the second distance is 1:1.5; wherein the protruding faces of the mounting portion are arranged in an annular manner; wherein each of the protruding faces of the mounting portion is extended radially inward toward a center of the mounting portion; wherein the receiving recesses of the mounting portion are arranged in an annular manner; and wherein each of the receiving recesses of the mounting portion is extended radially outward from the center of the mounting portion; and each of the protruding faces of the mounting portion has an arc-shape.