Ratchet driver

A ratchet driver including:

• a grip unit including a grip portion and a base connected to each other;
• a drive rod rotatably disposed on the base, and defining an axial direction, a radial direction and a circumferential direction;
• a rotatable member assembled to the base in the axial direction and rotatable relative to the drive rod about the drive rod, an inner surface of the rotatable member facing the drive rod including a first positioning hole, two second positioning holes and two pushing portions arranged at intervals along the circumferential direction, the first positioning hole being located between the two second positioning holes;
• a positioning assembly disposed on the drive rod and including an elastic member and a positioning member, the elastic member elastically abutting between the drive rod and the positioning member so that the positioning member is radially engageable in one of the first positioning hole and the two second positioning holes;
• and
• a ratchet mechanism including a ratchet ring and two engaging assemblies, the ratchet ring being disposed around an inner surface of the base, the two engaging assemblies being respectively disposed on opposite sides of the drive rod and selectively engageable with the ratchet ring, each of the two engaging assemblies including a driving portion, an engaging portion, a spring and a seat, the driving portion and the engaging portion being integrally connected to each other, the engaging portion being located on an inner side of the ratchet ring, the driving portion protruding beyond the ratchet ring and located on an inner side of the rotatable member, a portion of the driving portion being located on a moving path of the pushing portion, the engaging portion, the spring and the seat being arranged in a straight line in a direction perpendicular to the axial direction, a side of the engaging portion facing away from the seat including a plurality of teeth, the spring elastically abutting between the engaging portion and the seat so that the plurality of teeth are normally urged to mesh with the ratchet ring, and the seat slidably abutting against the ratchet ring;
• wherein when the rotatable member is rotated such that the positioning member is engaged in the first positioning hole, the two pushing portions do not push against the driving portions of the two engaging assemblies, and the engaging portions of the two engaging assemblies engage with the ratchet ring such that the grip unit and the drive rod are rotatable with each other;
• wherein when the rotatable member is rotated such that the positioning member is engaged in one of the two second positioning holes, one of the pushing portions pushes one of the driving portions along the circumferential direction toward the seat to drive the plurality of teeth of one of the engaging portions to disengage from the ratchet ring such that the drive rod and the grip unit rotatable with each other unidirectionally and idle in a reversed direction.