Patent ID: 7661339
Filing Date: 2010-02-16
Classification: B25B

Abstract:
1. A wrench comprising: a handle and an open-end connected to the handle and the open-end having two jaws, each jaw having a driving surface and the two driving surfaces of the two jaws facing each other, each driving surface having a contacting area and two yielding areas, the contacting area located between the two yielding areas of each driving surface and the contacting area including a contact portion and two notches, each of the notches having a plane surface and an inclined surface formed therein, the contact portion including a curved outer surface and being located between the two notches, two extension areas each connected between the yielding area and the notch corresponding thereto, a perpendicular corner formed at a joint area of the contact portion and the plane surface of the notch, and an obtuse corner formed at a joint area of the inclined surface and the extension area; wherein the contact portion and the two extension areas as a whole define a protrusive arced surface which has discontinuous points at the two notches, the contact portion is the most protrusive part of the arced surface.