Ratchet wrench with adjustable clamping size

A ratchet wrench with adjustable clamping size comprising:

• a body of the ratchet wrench including a head portion, a handle connected to the head portion and a switch member disposed at the head portion;
• a ratchet wheel pivotally disposed in the head portion and provided with a ratchet portion for engaging with the switch member, a pivot cavity with a bottom, and a guide slot formed in the bottom of the pivot cavity;
• an adjustment member pivotally disposed in the pivot cavity and including a rotating portion and a non-circular adjustment cavity located toward the guide slot;
• two engaging members oppositely provided on the ratchet wheel and the adjustment member and each including an engaging portion, a neck portion connected to the engaging portion and located in the guide slot of the ratchet wheel, and an upper portion connected to the neck portion and located in the adjustment cavity of the adjustment member, the upper portion being engaged with an inner surface of the adjustment cavity;
• and
• a spring disposed between the upper portions of the two engaging members to make the upper portion engaged with an inner surface of the adjustment cavity;
• by such arrangements, rotating the rotating portion of the adjustment member adjusts relative positions of the upper portions of the two engaging members in the adjustment cavity of the adjustment member, and makes the neck portions of the engaging members to move along the guide slot so as to change a distance between the two engaging portions.