Abstract: The present invention comprises a number of innovations in the design of self-adjusting pliers. A self-adjusting pliers tool formed of laminated sheet metal construction is provided with separately fabricated cast steel jaws that provide improved strength and durability relative to laminated jaws. Techniques are also disclosed for casting the steel jaws and for treating them to achieve improved surface hardness and corrosion resistance. In certain embodiments, the jaw and the jaw end of the laminated handle are designed to interlock to prevent the jaw from sliding out of position. In certain other embodiments, a “self-energizing” feature is provided in which the shape and tooth configuration of the jaw, and the angle of the jaw end of the pliers, cooperate to keep the tool secured to a workpiece even after the upward squeezing force on the lower handle is released.

Abstract: A pair of locking pliers includes a first assembly defining a first handle and a first jaw, a second handle, and a second jaw rotatably coupled to the first assembly and the second handle. The second handle is movable relative to the first handle to move the second jaw relative to the first jaw. An improved lock and release mechanism has a first setting wherein the second jaw is freely movable relative to the first jaw, a second setting wherein the second jaw locks at a preset distance from the first jaw when the second handle is moved toward the first handle, and a third setting wherein the second jaw unlocks when the second handle is moved toward the first handle.