Wrench

A wrench comprising:

• a body having a working end on one end thereof and the working end having a first toothed portion and a first room defined in an inner periphery thereof, a diameter of the first room being larger than that of the first toothed portion, the first toothed portion and the first room sharing a common axis, the body having a cap recess defined in a top face thereof, a second room defined beside the first toothed portion and communicating with the first room, the second room being not in communicating with the first toothed portion, a third room defined in the body and located away from the first toothed portion, the third room communicating with the second room, the second and third rooms both being opened through the top of the body, the cap recess located corresponding to the first, second and third rooms, a first pivot cavity defined in an end of the body and located opposite to the second room, the first pivot cavity being a closed circular hole, a first restriction portion formed in the body and located close to the first pivot cavity and being a slot, a first periphery defined in the inner periphery of the working end and located above the first toothed portion, a diameter of the first periphery being larger than that of the first toothed portion, and being less than that of the first room, the first periphery located between the first toothed portion and the first room, a second periphery defined in the inner periphery of the working end and located beneath the first toothed portion, a diameter of the second periphery being larger than that of the first toothed portion, the diameter of the second periphery being the same as the diameter of the first periphery;
• a driving unit pivotably located in the working end of the body and having a driving head, a first pawl, a second pawl and a pin, the driving head pivotably connected to the working end of the body and having a first recess and a second recess which is located beneath the first recess, the driving head having a first pivot hole which communicates with the first and second recesses, the driving head having a contact portion which is a flange and located between the first and second recesses, the contact portion being pivotably connected to the first periphery, the driving head having a groove defined in a periphery thereof, a rectangular protrusion extending from the driving head;
• the first pawl located in the first recess and having teeth formed in two ends thereof respectively, the teeth of the two ends of the first pawl engaged with the first toothed portion of the body respectively, a second pivot hole defined in a middle portion of the first pawl;
• the second pawl located in the second recess and having teeth formed in two ends thereof respectively, a third pivot hole defined in a middle portion of the second pawl;
• the pin extending through the first pivot hole, the second pivot hole and the third pivot hole;
• a first teeth disk pivotably located in the first room of the body and having a second toothed portion which is engaged with the teeth on the two ends of the second pawl respectively, two respective diameters of the second toothed portion and the first toothed portion being the same, the second toothed portion and the first toothed portion having the same number of teeth, the first teeth disk having a third toothed portion, the second toothed portion facing the first toothed portion;
• a second teeth disk pivotably located in the second room of the body and having a fourth toothed portion which is engaged with the third toothed portion of the first teeth disk, the second teeth disk having a first connection portion which is a hexagonal recess;
• a shaft located in the third room via the first pivot cavity and having a second restriction portion which is an annular groove, the shaft having a second connection portion at a first end thereof and the second connection portion being connected with the first connection portion of the second teeth disk, the second connection portion being a hexagonal rod which is inserted in the first connection portion;
• a grip connected to a second end of the second connection portion, the grip pivotably connected to the first pivot cavity of the body;
• a cap engaged with the cap recess to restrict the driving unit, the first teeth disk, the second teeth disk and the first end of the shaft in the body, the cap having a central hole through which the rectangular protrusion of the driving head of the driving unit extends, a third restriction portion being a recess and defined in an end of the cap;
• a restriction member extending through the third restriction portion of the cap, the first restriction portion of the body and engaged with the second restriction portion of the shaft, the shaft being restricted by the restriction member so that the shaft is pivotably located in the pivot hole, the restriction member and the third restriction portion of the cap being hidden in the grip, the restriction member being restricted by the grip such that the restriction member does not drop from the body;
• a washer located at the second periphery of the body, and
• a clip engaged with the groove of the driving head and contacting the washer.