Roller wrench

A roller wrench comprising:

• a body with a head, a chamber being disposed in the head;
• a driving member being a regular component with a plurality of sides, the driving member being installed in the chamber of the head and capable of rotating in the chamber;
• a plurality of rollers with a quantity the same as a quantity of the sides of the driving member, the rollers being installed in the chamber and respectively located between the sides of the driving member and a peripheral wall of the chamber;
• a reversing knob rotatably installed on the head, the reversing knob being capable of driving the rollers to move in the chamber, so that each of the rollers moves between one edge and another edge of each of the sides of the driving member;
• and
• at least one elastic positioning component installed at the driving member and comprising an elastic element and an abutting member;
• wherein each of the sides of the driving member has a central area, a latching surface is respectively provided on each side of two sides of the central area, the central area protrudes outward the two adjacent latching surfaces, each of the latching surfaces has an inner side connected to the central area and an outer side located away from the central area, a concave state of each of the latching surfaces is gradually concaved inwardly from the inner side to the outer side;
• for each latching surface, an included angle is formed between the inner side and the connected central area;
• when each of the rollers is located on one edge of each of the sides, a peripheral surface of each said roller of the plurality of rollers contacts with the latching surface and the peripheral wall of the chamber, so that the body, the rollers and the driving member are latched with one another, thereby the roller wrench is capable of driving the driving member;
• the driving member has a plurality of protrusions, each of the protrusions has a plane surface and two sloped surfaces, the plane surface is connected between the two sloped surfaces, the two sloped surfaces are connected to the outer sides of the two adjacent latching surfaces, respectively, a first one of the central areas is located between a first one of the protrusions and a second one of the protrusions, the sloped surface of the first one of the protrusions adjacent to the first one of the central areas is not parallel to the sloped surface of the second one of the protrusions adjacent to the first one of the central areas, and the abutting member of the at least one elastic positioning component is abutted by the elastic element of the at least one elastic positioning component to be exposed from a peripheral surface of the driving member so as to be located between two of the latching surfaces that belongs to one of the sides.