Patent ID: 7188551

Claim:
A spanner comprising: a lever; a first jaw extending from an end of the lever; a second jaw spaced from the first jaw in a predetermined distance to form a pair of jaws and having a recess therein; a toggle bar pivotally mounted in the recess by a pivot pin and having an inner end portion and an outer end portion; an urging member having one end supported by a wall of the recess and the other end supporting the outer end portion of the toggle bar for urging the toggle bar to pivot toward its inner end portion; an adjustable stopper for adjusting the limit of pivoting angle of the toggle bar being urged to pivot toward its inner end portion; wherein the adjustable stopper is a screw bolt mounted on the second jaw passing through the body of the second jaw so that an end of the screw bolt is in contact with the bottom surface of the inner end portion of the toggle bar, whereby the screw bolt can adjust the initial pivoting angle of the toggle bar.