Patent ID: 8826783

Claim:
A one-way open-end wrench including first and second jaws and a swing block connected to the first jaw, the one-way open-end wrench being characterized in that: the first jaw includes a flat face, a concave face, and a supporting element extending on the concave face and including first and second flat ends and a concave face between the first and second flat ends; the swing block includes: a platform including a lower face and an upper face; a hunch extending on the Libber face of the platform and including a convex face in contact with the concave face of the supporting element; and two fins extending on the upper face of the platform and each including an convex face corresponding to the concave face, wherein the fins are connected to the supporting element so that the swing block can swing relative to the supporting element, wherein the lower face of the platform does not extend parallel to the flat face of the first jaw when the first flat end of the supporting element contacts the upper face of the platform, wherein the lower face of the platform extends parallel to the flat face of the first jaw when the second flat end of the supporting element contacts the upper face of the platform.