Patent ID: 6520051
Filing Date: 2003-02-18
Classification: B25B

Abstract:
A head of a wrench comprising a hole (A) having a center (OA) and a radius (RA), the head further including a compartment (E) communicated with the hole (A), a wall (C) defining the compartment (E) having a center (OB) of curvature and a radius (RB) of curvature;wherein a ratio between the radius (RB) of curvature of the wall (C) and the radius (RA) of the hole (A) is defined as follows: (0.5&lE;RB/RA<1) andwherein a distance (R1) between the center (OA) of the hole and the center (OB) of curvature of the wall (C) is defined as follows: R1>RAâˆ’0.2*RB.