Patent ID: 7334507

Claim:
A toothless adjustable spanner comprising: a handle, a head at one end of the handle; a fixing jaw extending from the head; the head being formed with a sliding groove and a receiving groove in the head and communicated to the sliding groove; a sliding rod being received in the sliding groove and installed below a movable jaw; the movable jaw being installed in the sliding groove; the movable jaw having an inclined lower surface; two rolling rods installed in the receiving groove; an elastic unit resisting against the two rolling rods and the rolling rod resists against the inclined lower side of the movable jaw; wherein the elastic unit includes a first spring received in an inclined spring hole in the head; and a second spring being installed between the two rolling rods; at least one driving sheet installed at one outer side of an opening of the receiving groove; the sliding rod being installed to the driving sheet so that the sliding rod moves as the driving sheets move; wherein when the driving sheet is driven to move, the sliding rod will compress the first and second springs so that the the movable jaw is released; thus, a size of a space between the movable jaw and fixing jaw is adjustable.