Patent ID: 8485069

Claim:
A wrench with a ratchet device comprising: a wrench body, a driving set, a cover member and a controlling member; a hole opened at one end of the wrench body therethrough, a receiving space axially defined on an inside wall of the hole relative to the wrench body, the receiving space being corresponding to another end of the wrench body, a side entry opened on one side of the receiving space, an assembling groove axially defined at a bottom of the receiving space relative to the wrench body, the controlling member assembled into the assembling groove, a positioning groove axially defined at a bottom of the assembling groove relative to the wrench body; the driving set having a ratchet and a driving block, the ratchet assembled into the hole, a plurality of teeth defined around an outer periphery of the ratchet, the driving block assembled into the receiving space, two abutting faces respectively defined at two ends of the driving block, the two abutting faces both abutting against the bottom of the receiving space, two engaging parts defined on one side of the driving block, the two engaging parts being close to each other, the two engaging parts being both corresponding to the ratchet, the teeth of the ratchet selectively engaged with one of the two engaging parts; the cover member covering the hole and the side entry of the receiving space, a cover opening opened on the cover member, the cover opening being corresponding to the ratchet and being used to sleeve a top of the ratchet; and the controlling member having a switching member, a first elastomer and a second elastomer, the switching member inserted into the assembling groove and being rotatable relative to the assembling groove, the switching member having two indentations defined thereon, the two indentations being close to each other, the positioning groove being selectively corresponding to one of the two indentations, the first elastomer assembled onto the positioning groove to selectively abut against one of the two indentations of the switching member, the second elastomer assembled on the switching member to abut against the driving block; wherein when the ratchet is rotated relative to the wrench body in one direction, the teeth of the ratchet are engaged with one engaging part of the driving block; in contrast, when the ratchet is rotated relative to the wrench body in another direction, the teeth of the ratchet are disengaged with one engaging part of the driving block step by step.