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Locking pliers
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Locking pliers
please note:
- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
{{Short description|Clamping hand tool}}{{Redirect|Vice Grip|the Parkway Drive song|Ire (album)}}{{EngvarB|date=August 2016}}- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
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- Locking pliers.jpg -
A historic version of the Vise-Grip brand locking pliers
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. They also come in many sizes.- Locking pliers.jpg -
A historic version of the Vise-Grip brand locking pliers
History
(File:Pince étau.jpg|thumb|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.WEB,weblink Vise Grip, Living History Farm, York, Nebraska,weblink Vise-Grip at Irwin BrandsLater, 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.Etymology
In the United States, the brand name "Vise-Grips" is close to a generic name for this type of pliers. The same is true in the United Kingdom of the brand name "Mole Wrench".The spelling "vise" is mentioned in Samuel Johnson's 1755 dictionary.WEB,weblink Johnson's Dictionary Online, This spelling is orthodox in the United States.The spelling "vice" can be traced back to 1584, for the clamping sense of the word.(Oxford English Dictionary, Quote from F. Collins Wills & Admin. Knaresborough Court Rolls (1902) I. 145 "...one vice, all my naile tooles and all my hammers". This is the current spelling in the English speaking world except for the United States.Mechanism
Locking pliers remain clamped to an object without requiring continuous pressure on the handles based on the "over-center" principle. After being properly adjusted using a threaded screw, the pliers are brought to bear by cam action. In the process of being closed on an object the mechanism passes through a point of maximum tightest clamping and as the handle levers are closed further, the jaws release slightly. This means that to open the jaws have to be tightened, thus maintaining the clamping pressure. The inherent flexibility of the pliers maintains a spring pressure on the jaws such that the handle needs to be pulled open to release the clamping pressure. In many modern versions an additional inner lever aids release.Operation
File:Locking plier misuse.JPG|thumb|Locking pliers being used as a substitute knob on an espresso machineespresso machineThe bolt is used to set the jaws to a size slightly smaller than what is to be gripped.The jaws are then closed on the gripped object.Because of the lever action the jaws move only slightly but with much force.Locking pliers have four advantages:- Their lever action is stronger than that of ordinary pliers, so they can apply much more force;
- Even though they can apply more force, they do so in a very controlled manner; this is because the jaws will never close beyond the set point;
- The closing point and with it the force that is applied on the gripped object can be finely controlled;
- When they are closed they remain closed on their own until manually released, in many modern versions using a supplementary lever on the lower handle.
References
{{Reflist}}External links
{{commons category|Locking pliers}}- History of the Vise-Grip
- "New Tool Is Both Pliers and Wrench" Popular Science, December 1935, page 42
- "Wrench with Vise Like Grip Keeps Work from Slipping", Popular Mechanics, September 1935, page 326
- Last Day Cover Newport Mon The Home Of The Mole Wrench at newportpast.com
- content above as imported from Wikipedia
- "Locking pliers" does not exist on GetWiki (yet)
- time: 5:43pm EDT - Sat, May 04 2024
- "Locking pliers" does not exist on GetWiki (yet)
- time: 5:43pm EDT - Sat, May 04 2024
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