Patent ID: 8757032

Claim:
A shifting device for a wrench tool comprises: a tool head including a driving portion defined on one end thereof and an axial hole defined on another end thereof, and the axial hole having a plurality of inner teeth defined around an inner surface thereof; a rotating rod including an axial peg extending outwardly from one end thereof to be fitted in the axial hole of the tool head, and the axial peg including a first groove horizontally defined on a bottom end thereof and a second groove vertically formed on a top end thereof and communicating with the first groove; an engaging member received in the first groove of the rotating rod and having a toothed section defined on one end thereof and a pushing section formed on another end thereof; a controlling member fixed in the second groove of the rotating rod and having an abutting stem extending into the first groove, such that the controlling member pushes the pushing section of the engaging member so that the toothed section of the engaging member engages with the plurality of inner teeth of the tool head; two elastic loops fitted on the axial peg of the rotating rod to push the one end of the engaging member so that the engaging member moves back to an original position.