Patent ID: 8347763

Claim:
A wrench with a quickly rotatable driving head comprising: a handle having one end provided with a first positioning portion, said first positioning portion bored with an insert hole, said insert hole formed with an inner wall in an interior, said inner wall transversely formed with a restraining member; a driving head having one end disposed with a second positioning portion corresponding with said first positioning portion, said second positioning portion able to be positioned with said first positioning portion; and a quick-disengaging unit assembled between said first positioning portion and said second positioning portion, said quick-disengaging unit composed of a fixing member, an operating member, an elastic member and a restraining element; said fixing member having one end defined to be a fixing end to be secured with said second positioning portion, another end of said fixing member being a free end extended toward said insert hole of said handle, said fixing member having a circumferential side axially and continuously cut with a deep recess and a shallow recess, said deep recess and said shallow recess communicating with each other; said operating member having one end provided with an accommodating space, said operating member inserted through said insert hole of said handle and then fitted around said fixing member, said operating member able to slide axially along said fixing member, said operating member having another end transversely formed with a position-limiting member, said operating member having a circumferential side bored with a position-limiting hole communicating with said accommodating space; said elastic member positioned between said fixing member and said operating member; and said restraining element received in said position-limiting hole and having two opposite ends protruding out of said position-limiting hole and respectively pushing against said shallow recess and said restraining member.