Patent ID: 9168643
Filing Date: 2015-10-27
Classification: B25B

Abstract:
1. A driving rotation tool, comprising: a socket base; a socket clearance hole being in said socket base and surrounded by three first gripping surfaces, three second gripping surfaces and six third gripping surfaces for development of edge planes around said socket clearance hole wherein each third gripping surface is located between a first gripping surface and a second gripping surface for circular permutation of first gripping surface, third gripping surface and second gripping surface; each first gripping surface is a cambered surface, each second gripping surface is an angled surface consisting of two adjoining planes which form an obtuse angle greater than 90 degrees, wherein a surface area of the first gripping surface is larger than a surface area of the third gripping surface, wherein a surface area of the second gripping surface is larger than a surface area of the third gripping surface, and wherein each first gripping surface comprises at least an intrados on its cambered surface in place.