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Buck Rush Knife Dismantled Assisted Opening Knives Information
Assisted opening knives are designed so that the knife can be opened with one hand. There are many situations where it is impractical to carry a fixed blade knife in a sheath. Instead a compact, lightweight folding knife is preferrable. Situations where one handed opening is necessary, include, during rock climbing, boating, kayacking, parachuting, motorsport and other emergency situations. The blade of an assisted opening knife does not open at the press of a button. The blade is held closed until it has been manually opened past the thirty degree position. Once the blade has been partially opened, it then engages a spring to rapidly open the blade.
Several manufacturers have developed their own assisted opening technology. These include the Benchmade 'Optimiser' and Kershaw 'Speed Safe' designs. In the case of the Buck Rush Knife, the force which fully opens the blade is provided by a pair of coiled springs, built into each aluminium handle slab. These act to open the blade fully once it has been manually opened past 30 degrees.
The action of the springs is controlled by an eccentric cam pivot in the blade tang behind the pivot pin. In the closed position, the direction of the force is such that it keeps the blade closed. As the blade is manually opened past the 30 degree position, the force of the springs gradually increases to rotate the blade open. The speed of opening may be adjusted by tightening or loosening slightly the pivot pin retaining screw (a size T7 Torx fixing).