Patent ID: 8443701
Filing Date: 2013-05-21
Classification: B25B

Abstract:
1. An open wrench comprising: a handle which is flat relative to a horizontal plane, a first driving head connected to a first end of the head and having a clamping opening with which a hexagonal head of a bolt being clamped, an axis of the clamping opening being perpendicular to the horizontal plane, an opening communicating with the clamping opening and located at a front end of the first driving head, the first driving head having two second flat portions which are located on top and bottom of the driving head respectively and symmetric relative to the horizontal plane, the second flat portions each having an outer face, an inner face and a recess, the outer face, the inner face and the recess located around the clamping opening and arranged in U shape, the inner face located close to the clamping opening and the outer face located close to the inner face, the outer face being higher than the handle, the inner face being higher than the outer face, the outer face being raised, relative to the horizontal plane, from a mediate portion thereof and toward two ends of the outer face, a first inclined angle being defined between the outer face and the horizontal plane, the first inclined angle being in a range between 1 to 3.5 degrees.