Patent ID: 7987749

Claim:
A wrench with a rotatable head comprising: a handle and at least one head, the handle and the head are connected via a first end and a second end, and an angle of the head with respect to the handle being adjustable, wherein: the first end includes an upper lug, a lower lug, and a space defined between the upper and lower lugs; a first toothed hole is formed in the upper lug, the inner surface of the first toothed hole is formed with a plurality of teeth; a through hole is formed in the lower lug and aligned with the first toothed hole; a second toothed hole is formed in the second end and the inner surface of the toothed hole is formed with a plurality of teeth; the second end is inserted in the space between the upper and lower lugs and the second toothed hole is located between the first toothed hole and the through hole; and a toothed pillar, the periphery of the toothed pillar is formed with a plurality of teeth, the toothed pillar is movably engaged in the toothed holes, the toothed pillar can be moved upward to an engagement position or be moved downward to a disengagement position; when the toothed pillar is in the engagement position, the teeth of the toothed pillar are synchronously engaged with the teeth of the first and second toothed holes; when the toothed pillar is in the disengagement position, the teeth of the toothed pillar are disengaged from the teeth of the first toothed hole and only engaged with the teeth of the second toothed hole, wherein at least one elastic positioning member is disposed on a lower side of an outer periphery of the toothed pillar; when the toothed pillar is in the engagement position, the elastic positioning member is abutted against an inner surface of the through hole.