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Irwin was founded in 1885 in Martinsville, Ohio as the Irwin Auger Bit Company by Charles Irwin, a pharmacist. Irwin had bought the rights to a solid-center auger bit from a local blacksmith. [3] In 1924, another blacksmith, Danish immigrant William Petersen of DeWitt, Nebraska, invented the first locking pliers [4] and named them Vise-Grips. [5]
An F-clamp consists of two horizontal bars joined together by a vertical bar. This gives the clamp an appearance of the letter F. There is a large screw on the lower bar to allow for the clamp to be tightened. [1] F-clamps are adjustable, which allows for them to be used on larger scale objects without the need for a large screw.
Some locking pliers have a lever (on lower arm, right) to aid release from the locked position. The first locking pliers, with the trade name Vise-Grip, were invented by William S. Petersen in De Witt, Nebraska, United States in 1924.
Top: Pipe clamp; Upper row: F-clamp or bar clamp, one-handed bar clamp ("Quick Grip"), wooden handscrew; Lower row: spring clamp, C-clamp (G-clamp ), wooden cam clamp. A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure.
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Hand tools Clamps Woodworking clamps. Top left two are f-style clamps. On the right is a quick-grip Irwin clamp. In the bottom middle is a spring clamp. Clamps are used to hold a workpiece while being worked. Clamps vary in all shapes and sizes from small c-clamps to very large bar or strap clamps. [20]
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