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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.
An OTF Knife, also known as an out-the-front knife, sliding knife, telescoping knife, or angel blade, is a pocketknife with a blade that opens and closes through a hole in one end of the handle. This design contrasts with the majority of utility knives, which are either standard folding knives or are "fixed blade" sheath knives (having no ...
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. [6]
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 ...
The majority of Emerson's folding knives are equipped with the Wave: a hook on the spine of the blade (originally designed as a blade catcher) which, when snagged on the edge of the pocket or sheath causes the knife blade to open as it is drawn. [3] Emerson called this innovation the Wave and secured a patent for it in March 1999. [4]
A gravity knife is a knife with a blade contained in its handle, which opens its blade through the force of gravity. [1] This mechanism of opening is fundamentally different from the switchblade, which extends its spring-propelled blade automatically upon the push of a button, switch, or fulcrum lever. [1]
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