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Locking pliers (also called Vise-Grips, Mole wrench or Mole grips) are pliers that can be locked into position, using an "over-center" cam action. Locking pliers are available with many different jaw styles, such as needle-nose pliers, wrenches, clamps and various shapes to fix metal parts for welding.
Mole branded Self-grip wrench locking pliers. Thomas Robb Coughtrie (25 November 1917 – 27 August 2008) was a chartered engineer from Motherwell, Lanarkshire, Scotland.. He was credited by The Times as the inventor of the self-grip Mole wrench [1] although this conflicts with other sources which show the invention of the Vise-Grip locking pliers [2] in Nebraska, United States, with an ...
In 1924, another blacksmith, Danish immigrant William Petersen of DeWitt, Nebraska, invented the first locking pliers [4] and named them Vise-Grips. [5] In 1934, Petersen formed the Petersen Manufacturing Company to produce them. [6] In 1957, Petersen added an easy-release trigger to the design, creating the modern locking pliers design. [7]
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Self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece.
Medieval pincers found in Hamburg-Harburg (15th/16th century) As pliers in the general sense are an ancient and simple invention, no single inventor can be credited.Early metal working processes from several millennia BCE would have required plier-like devices to handle hot materials in the process of smithing or casting.