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The Speedsafe Mechanism from Kershaw aids in quicker, easier opening—the user applies a manual push to the thumb stud or pulls back on the flipper. It is important to note that the Speedsafe mechanism is not a switchblade or automatic mechanism, as it still requires manual operation from the user and cannot be actuated by a simple push of a button. The Speedsafe mechanism utilizes a torsion bar to prevent the knife from opening by creating a bias toward the closed position. However, once the user applies pressure to the thumb stud or flipper, the torsion bar moves along a half-moon track to assist the knife into the open position. Although the Speedsafe mechanism is considered an assisted-opening mechanism and not automatic, there still may be laws and ordinances preventing its carry in your area, and it is recommended that you know your local laws before carry.
Bottom Right: Kershaw uses their excellent flipper-operated Speedsafe assisted opening mechanism on the AM-3 and 4, making them lightning fast to put into play.