| 摘要 |
An open end wrench that is adapted to rotate a predetermined hexagonal nut having equal, flat sides without deforming any of the corners of the nut. The wrench includes a lever arm and a head. The head is joined to the lever arm. The head has a first jaw that may be integrally joined to a second jaw. Each of the jaws has an open end and a drive face. The drive face of the first jaw opposes the drive face of the second jaw. In addition, the drive face of the first jaw is joined to the drive face of said second jaw by a rear face. Each of the drive faces has a plurality of contact surfaces. Each contact surface is a convex curve that protrudes toward the opposing drive face. Each contact surface has a peak. The distance between opposing peaks may be about equal for each set of opposing peaks and only slightly greater than the distance between opposing sides of the nut. The jaws of the wrench may be slid over the nut such that a corner of the nut is placed in contact with the rear face. When a corner of the nut is placed in contact with the rear face, the peaks of at least two of the contact surfaces of each drive face are adapted to be substantially adjacent to intermediate portions of respective sides of the nut. In this drive position, the wrench is adapted to rotate the nut without placing a corner of the nut in contact with either of the drive faces. As a result, the wrench may rotate a nut without deforming the corners of the nut.
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