| 摘要 |
The new type of wrench is a hand tool used conveniently for tightening various kinds of hexagonal shaped members. It may be inserted easily, does not break angularity, does not slip and is suitable to be used in the narrow space. There are two working positions between which there is an angle of theta at the same turning direction, the angle of theta is range from 10 DEG to 20 DEG . The distance from the centre of two working positions to the center of the wrench is not more than 1/3 length of the edge of hexagonal member. All applied force points are positioned within 0.55-0.85 length of corresponding edge. Its construction is simple and made easily. Its cost is low.
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