| 摘要 |
A wrench capable of transferring power effectively comprise a wrench body having an end formed with a driving portion; the driving portion being formed with a receiving portion; a ratchet wheel being mounted in the receiving portion of the driving portion and having a periphery formed with a plurality of oblique concave portions; a plurality of rollers movably mounted in the oblique concave portions. When the roller is at a position where one side of the roller is in contact with a periphery of the driving portion and one side of he roller is in contact with a long side of the oblique concave portions, a line tangent to the periphery of the driving portion and passing through the contact point of the roller and the driving portion is inclined to the long side of the oblique concave portions with an angle preferably between 5 degrees to 30 degrees.
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