Adjustable wrench with worm locking mechanism

An adjustable wrench having locked and unlocked conditions, the wrench comprising:

• a wrench body including a fixed jaw;
• a movable jaw slidably mounted on the wrench body;
• the wrench body having first and second contact walls, the second contact wall having a plurality of wall cam surfaces;
• an adjuster assembly including a worm gear on the body between the contact walls and threadedly engaged with the movable jaw for moving the movable jaw toward and away from the fixed jaw;
• a locking disc disposed between the worm gear and the second contact wall and having a plurality of disc cam surfaces, each disc cam surface being engagable with one of the wall cam surfaces of the second contact wall, the locking disc being rotatable by a user's finger between the locked and unlocked conditions, each disc cam surface engaging one of the wall cam surfaces in the locked condition for wedging the adjuster assembly and the locking disc between the first and second contact walls to substantially prevent rotation of the worm gear and movement of the movable jaw, the locking disc in the unlocked condition releasing the disc cam surfaces from engagement with the wall cam surfaces so that the worm gear is free to rotate;
• and
• structure for preventing axial movement of the worm gear when the locking disc is rotated from the unlocked to the locked condition.