| 主权项 |
1. A wrench comprising:
a first part having a first toothed portion defined in a curved and convex surface thereof, a first pivotal portion formed in a first end of the first part, a first room defined in an opposite side of the tooted portion and located close to a second end of the first part, a second pivotal portion defined in the second end of the first part, the first room communicating with the second pivotal portion; a second part being a curved part and having a third pivotal portion and a first passage respectively defined in two ends thereof, a second room defined in the second part and dividing the second part to be a fork-shaped part having a first extension and a second extension, the first passage defined through the first extension and a first engaging portion defined through the second extension, the first passage and the first engaging portion both communicating with the second room, the first passage located corresponding to the first engaging portion, the second room located between the first passage and the first engaging portion, a diameter of the first engaging portion being larger than that of the first passage, the first pivotal portion being pivotably connected to the third pivotal portion so that the second part is pivotable about the first pivotal portion, a second passage defined through the first and second extensions, the second passage located between the third pivotal portion and the first passage, the second part having a curved first face which faces the first part; a curved third part movably connected to the second part so that the third part is overlapped the second part on various areas, the third part being positioned relative to the second part on at least two positions, the third part having a second toothed portion defined in an concaved side thereof and facing the first toothed portion, the second toothed portion and the first toothed portion adapted to clamp objects of different sizes therebetween, the third part having an insertion portion which is located within the second room, a height of the second room being smaller than a thickness of the third part except for the insertion portion, the insertion portion having a curved slot which has a first inner end and a second inner end, the curved slot having a second engaging portion and at least one third engaging portion, a diameter of each of the second engaging portion and the at least one third engaging portion being the same as the diameter of the first engaging portion, the second engaging portion located corresponding to the first inner end, the at least one third engaging portion located between the first and second inner ends, a second face defined between the insertion portion and the third part, the second face facing the first face, a cross sectional area between the insertion portion and the second face being a T-shaped area, the second face being a curved face; an engaging member extending through the first passage and having a fourth engaging portion and a recess, the fourth engaging portion engaged with the second engaging portion and the first engaging portion so that the third part is positioned relative to the second part at a first position by the engaging member, the second room and the curved slot being hidden in the second part, when pressing and moving the engaging member to disengage the fourth engaging portion from the third engaging portion and to be located in the second engaging portion, the third part is movable relative to the second part and along the curved slot, when the fourth engaging portion is engaged with the third engaging portion and the first engaging portion, the third part is positioned relative to the second part at a second position, the second room and the curved slot partially protruded beyond the second part, the engaging member having a recess defined therein; a spring received in the recess of the engaging member so that the engaging member returns to its initial position after being pushed; an end piece fixed to an inner periphery of the first engaging portion, the spring being biased between the engaging member and the end piece; a restriction member being a cylindrical member and extending through the second passage and the curved slot, the curved slot being tangent to the restriction member, the third part being movable along the curved slot and being adjusted relative to the second part by the engaging member and the restriction member, the restriction member preventing the third part from disengaging from the second part, and restricting a maximum displacement of the third part, when the fourth engaging portion is restricted by the third engaging portion and the first engaging portion, the third part is positioned relative to the second part at the second position, the restriction member contacting the second inner end of the curved slot, and a fourth part being a cylindrical part and having a head which is located in the first room, a fourth pivotal portion defined in the head and pivotably connected to the second pivotal portion so that the first part is pivotable relative to the fourth part an angle about the second pivotal portion. |
