Ratchet wrench having positioning mechanism

A ratchet wrench having a positioning mechanism, comprising:

• a drive bar, the drive bar including a fork arm, a fork opening formed at the fork arm, an axial hole communicating with the fork opening, and a radial hole communicating with the axial hole;
• a rotary head, the rotary head being pivotally connected to two ends of the fork arm, the rotary head including a round housing, a ratchet apparatus disposed inside the round housing, a plurality of positioning recesses disposed on the round housing, and a pivot axis formed at the rotary head and passing through the two ends of the fork arm, wherein the pivot axis is perpendicular to the radial hole;
• and
• a locking button, the locking button including a locking rod disposed in the radial hole and a latch bar disposed in the axial hole, the locking rod being radially movable in association with movement of the latch bar, the latch bar being engaged with or disengaged from any of the positioning recesses.