Bidirectional ratchet structure, bidirectional ratchet wrench and method for changing a direction thereof

A bidirectional ratchet wrench, comprising:

• a handle for being held by a user, and
• a bidirectional ratchet structure, comprising:
• a base connected with the handle;
• a first pawl element comprising a first engaging portion, wherein the first pawl element is pivotally disposed at the base;
• a second pawl element comprising a second engaging portion, wherein the second pawl element is pivotally disposed at the base, and the first engaging portion of the first pawl element and the second engaging portion of the second pawl element are pushed to protrude from the base alternatively;
• two reset elements, wherein one of the reset elements disposed between the base and the first pawl element is for pushing the first engaging portion of the first pawl element to protrude from the base, and the other one of the reset elements disposed between the base and the second pawl element is for pushing the second engaging portion of the second pawl element to protrude from the base;
• a direction controller pivotally and coaxially disposed at the base, wherein the first pawl element and the second pawl element are surrounded by the direction controller, and the direction controller comprises a pressing portion inwardly protruded from the direction controller to contact with the first engaging portion or the second engaging portion to prevent the first engaging portion or the second engaging portion from being protruded from the base;
• and
• a driving element pivotally and coaxially disposed at the base, wherein the first pawl element and the second pawl element are rotatably surrounded by the driving element, the driving element comprises an inner tooth portion, and the inner tooth portion engages with the first engaging portion of the first pawl element or the second engaging portion of the second pawl element which is pushed to protrude from the base;
• wherein the direction controller comprises an annular portion having an inner surface, a top, a bottom and a rim portion which extends radially inwardly from the inner surface of the annular portion at a location between the top and the bottom of the annular portion;
• wherein the rim portion of the direction controller has a top surface which contacts the driving element, a bottom surface which contacts the base, and an innermost surface which defines the pressing portion.