Roller wrench

A roller wrench comprising:

• a body with a head, a circular chamber being disposed in the head;
• a driving member being a regular polygonal 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;
• and
• a reversing knob being disk-shaped and 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 moving between one edge and another edge of each of the sides of the driving member;
• further comprising:
• at least one elastic positioning component, each of the elastic positioning components being installed on one of the sides of the driving member and located between the two edges of the side, and capable of elastically moving into the driving member or protruding from a peripheral surface of the driving member;
• the elastic positioning component being moved into the driving member when being compressed;
• and being protruded from the driving member when not being acted on by an external force;
• at least one of the rollers being limited by the at least one elastic positioning component to position the rollers and the reversing knob;
• when the reversing knob being rotated, the roller pressing the elastic positioning component to make the rollers moving from one of the edges to the other edge of each of the sides of the driving member respectively;
• wherein the rollers are arranged in a circle at equal intervals, and one end of each of the rollers is directly rotatably pivotally connected to a bottom surface of the reversing knob via a pivot shaft;
• when the reversing knob is rotated, the reversing knob drives the rollers to displace.