Abstract: A wrench of the type having one handle produced by the manufacturing processes of drop forging and machining, incorporating a pivot point that acts as a fulcrum for a cam member that is integral with a wormwheel segment. The cam member terminates in the recess of a moveable jaw member which provides the surface for the cam to advance or retrack the jaw member toward or away from a fixed jaw that is integral with the handle member. The wormwheel is meshed with a worm gear member that can be rotated, advancing or retracking the moveable jaw member toward or away from a fixed jaw that is integral with the handle member.

Abstract: A wrench of the type having one handle member connected to a pivotal arm member at a pivot point. The handle member, and the pivot arm member terminate in a jaw member, the jaw in the handle member being fixed. Advancing a screw member causes the pivot arm member to rotate about the pivot point so that the jaw members are brought together. A pair of slots translate the rotating motion of the pivot arm member about the pivot point into linear components. The jaw member at the end of the handle member and the pivot arm member are biased apart from one another by a spring, but the bias may be overcome by squeezing the handle and pivot arm member or by advancing the screw member. When the screw member is fully retracted, the spring separates the jaw members. When the screw member is advanced, it prevents separation of the jaw members.

Abstract: A wrench of the type having two handle members pivotally connected to one another at a pivot point. Each handle member terminates in a jaw member. Advancing a screw member causes one of the handle members to rotate about the pivot point so that the jaw members are brought together. A pair of slots translate the rotating motion of the handle member about the pivot point into linear components. The jaw members at the end of each handle are biased apart from one another by a spring, but the bias may be overcome by squeezing the handle or by advancing the screw member. When the screw member is fully retracted, the spring separates the jaw members. When the spring member is advanced, it prevents separation of the jaw members.