TAC Force Spring Assist Folding Knife Review

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Spring Assist Knife
4.5" Closed
3Mm Black Blade
Half Serrated Blade
Desert Camo Coated Nylon Fiber Handle

Tac-Force Tactical Spring Assisted Knife

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]

The first assisted opening knife was designed by Blackie Collins in 1995 and was named the "Strut-and-Cut"; it was based on the strut of his Ducati motorcycle.[2] A similar concept was developed three years later by knifemaker Ken Onion with Onion's idea based on a similar mechanism in his Harley Davidson motorcycle.[1] Onion applied for a patent on his design in 1998.[3]

When the knife is in the closed position, the blade is held in place by means of torsion springs and an additional blade lock (optional). As the user applies manual pressure to the thumbstud to open the knife, a mechanism such as a torsion spring moves along a track in the liner and rapidly rotates the blade into the open and locked position.[1]

Although commonly confused with switchblade knives, a switchblade can be opened automatically simply with the push of a button, but the user of an assisted-opening knife must open it about one-quarter of the way (45°) before the mechanism opens the knife the rest of the way.[4] The difference is important legally; because the blade does not open simply "by the push of a button or by force of gravity" the assisted-opening knife is typically not considered a switchblade,[5] and may escape the restrictions applying to those in many places. In 2018, New York's highest court sustained a criminal conviction for possession of a switchblade against a defendant found in possession of an assisted-opening knife.[6]

Additionally, despite the explicit illegal classification of switchblade knives in the UK, assisted opening knives remain permissible to own.[7]

Other trade names for assisted-opening knives are: Forward Action Spring Technology, A/O Knife, Torsion Assist Knife, Assisted Knife, Spring Assist Knife, Spring Assisted Knife, Quick Release, Quick Draw, Alternative Automatic, Outburst, SpeedSafe, Blade Launcher, S.A.T (SOG Assisted Technology), and the Semi-Auto.