Patent ID: 8850930

Claim:
An adjustable wrench comprising: a handle having two lugs extending from one end thereof and each lug having a through hole; a head having a protrusion extending from a first end thereof and a passage defined through the protrusion, the protrusion located between the two lugs and a pivot extending through the two through holes and the passage, the head having a guide hole which has a first position and a second position, a pin extending through the guide hole and having a side hole defined radially in an outer periphery thereof, a positioning unit located in the side hole and engaged with the first position of the guide hole, the head having a slot defined in a second end thereof and an opening defined in a side of the head and communicating with the slot, two wing plates extending from the head and each wing plate having a hole, a pin extending through the holes of the two wing plates, and a clamping device having a fixed jaw and a movable jaw, the fixed jaw having a travel path and the movable jaw having a toothed rod connected thereto, a slide slot defined in a side of the fixed jaw, the fixed jaw having a board extending therefrom and the board inserted into the slot of the head, the board having a stop extending therefrom, the fixed jaw having an opening in which a push spring, a stop plate and a worm rod are received, a pin extending through the push spring, the stop plate and the worm rod, the fixed jaw connected to the head by inserting the board in the slot of the head, the pin extending through the two wing plates and the board, the movable jaw being slidably connected to the slide slot, the toothed rod located in the travel path and engaged with the worm rod.