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A Kershaw Leek Assisted-opening knife in action. On 28 December 1998, the USPTO granted and published U.S. patent 6,006,385 for inventors Peter G. Kershaw, Douglas B. Flagg, Craig Green and Katsumi Hasegawa. The patent was filed on 24 January 1997 by Kai USA Ltd, who was also the assignee for the duration of its 20-year life span.
[5] [6] The two became friends and Onion learned his basic knifemaking skills from Stanley, building his first knife in 1991. [6] Five years later, in 1996, Doug Flagg, then with Kershaw Knives met Onion while calling on an account for Kershaw and the two discussed an arrangement for the assisted-opening mechanism, which led to a contract.
An assisted-opening knife being opened. An assisted-opening knife is a type of folding knife which uses an internal mechanism to finish the opening of the blade once the user has partially opened it using a flipper or thumbstud attached to the blade. [1] When the knife is in the closed position, the blade is held in place by means of torsion ...
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CRKT owns fifteen patents and patents pending. These include the Outburst assist opening mechanism, Lock Back Safety (L.B.S.) mechanism, Veff-Serrated edges, and the Deadbolt Lock. The Outburst is the company's proprietary mechanism for their assisted-opening knives. These knives are standard pivot joint liner lock or frame lock folding knife.
A folding switchblade. A switchblade (also known as switch knife, automatic knife, pushbutton knife, ejector knife, flick knife, gravity knife, flick blade, or spring knife) is a pocketknife with a sliding or pivoting blade contained in the handle which is extended automatically by a spring when a button, lever, or switch on the handle or bolster is activated.
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