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The first locking pliers, with the trade name Vise-Grip, were invented by William S. Petersen in De Witt, Nebraska, United States in 1924. [1] [2] Later, in 1955, in the United Kingdom, M K Mole and Son, a hand tool manufacturing company, under the managing direction of Thomas Coughtrie, began making nearly identical pliers.
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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Parallel pliers have jaws that close in parallel to each other, as opposed to the scissor-type action of traditional pliers. They use a box joint system to do this, and it allows them to generate more grip from friction on square and hexagonal fastenings. [2] There are many kinds of pliers made for various general and specific purposes.
It is best known for its pliers—the company manufactures more than 75 types and sizes of pliers [1] —particularly its eponymous style of tongue-and-groove, slip-joint pliers. [2] Its pliers have distinctive sky-blue handle grips; the company has been using the same trademarked shade of blue since 1956. [3]
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