| 摘要 |
Wrench structure for placement on over a generally circular workpiece in either a lateral or an axial direction and having a drive head with a cavity formed by a base member and an access cap, a bore formed thru the base member and cap around a rotational axis for accommodating the workpiece, a plurality of gripping jaws pivotally mounted within the cavity and arranged in a substantially circular pattern around the rotational axis and having gripping faces extending at least partially into the bore, each face being knurled and formed substantially on a radius line which makes an angle from about 6.0° to about 25° with a longitudinal axis of the jaw at a lateral midpoint of the face, and each face thereby having a neutral contact portion and a working contact portion.
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