Patent ID: 8347764

Claim:
A ratchetable open-ended wrench for turning a rotatable workpiece, comprising: a wrench head for rotating the workpiece, which includes a drive opening therein, comprising: a first jaw including a first driving wall; a second jaw substantially extending from a base portion of the wrench head to a free end, and comprising: a second driving wall, formed on the free end of the second jaw and facing the first driving wall; an inner wall, extending from the second driving wall to an inside portion of the second jaw; a rear-end wall provided adjacent to the base portion, said rear-end wall facing said first jaw so as to work with said first jaw to clamp a portion of the workpiece to be rotated; a concavity formed between said second driving wall and the rear-end wall; an auxiliary jaw retracting opening, extending from the base portion and adjoining the concavity; an auxiliary jaw elastically and longitudinally slidable along the auxiliary jaw retracting opening, comprising: a pillow facing the inner wall; a fastener contact surface for contacting the workpiece, comprising: a driving surface, substantially disposed adjacent a workpiece contact edge; and a pushing surface, substantially directed toward said drive opening and provided adjacent the portion of the workpiece contact edge that is away from the base portion; an interior end elastically coupled to the auxiliary jaw retracting opening; a limiting slot; an auxiliary jaw limiting member, coupled with the limiting slot, for confining the auxiliary jaw to move between an unbiased first position and a biased second position; and a fastener room, located between the auxiliary jaw and the first driving wall and adjoining the concavity, wherein the concavity and the fastener room together forms a working space which is sufficiently large to allow the workpiece to remain therein for a full 360-degree turn of the wrench head.