accidental closing

I have touched this around my page. It is very important to know and learn about the mechanisms. It does not hurt having some more talk about it.


The anatomy and performance of a modified liner locking mechanism for “preventing accidental closing” used on the 130mm Wenger knives:

The purpose of preventing accidental closing is a term for knives that are designed to have an extra safety against closing during normal motion. Normal motion is the direction that put the least amount of pressure against the lock. Some cutting motions and directions will to some degree put strain on the lock. This it is designed to take but it is not designed to be stabbed or forced against the lock with. The lock is designed to prevent accidental closing from a motion or a slip with the feet on the ground and that the blade shall not fold over the fingers during a fall but this is with no guarantee.  It is there for safety but it is no guarantee against failure. Most likely it will protect you very well.

The construction of the Wenger knife is free from the locking mechanism and by this I mean that the spring construction will hold the blade open or closed. The knife shall be used as if there is no lock at all. With a blade with length then the back springs would have to be very strong to prevent the blade from closing so a lock for accidental closing must be made for that reason as well. It is there to preserve the comfortable cutting during use. The lock will immediately support when the edge sticks to the surface. Sometimes it is not easy to feel that the edge will not let go of the material you cut and it will therefore fold over the fingers, or it may fold. This is also a factor that the preventing accidental closing is for.

Because the back spring will prevent you or counter the thumb from opening the blade you may get a slower one hand opening blade, it let go the last 20% and locks into place. When the lock is active it will prevent accidental closing. When opening the blade go 100% out and do not stop with the thumb before it locks into place.

The mechanism on the Wenger knife got flexibility in it. The lock is typical Wenger because it will flex just as the blade does. It will flex to avoid bending. The components are very good and durable.

A lock designed for accidental closing will never be a product for combat in any way.

The safest way is always the most controlled way and not with speed usually.

When you cut with a folding knife you pull the blade out in a way to prevent the blade folding. Backing out of a cut the edge may stick to the surface and fold and also put strain on a lock. This the lock is also designed to take but not with force backing out of a cut. There is no guarantee.

A lock to prevent accidental closing will also serve as a support and safety when you apply serious force on the back spring. This is when you put force against the edge. This is not against the lock but when you let go of the pressure against the edge then there will be a release of tension and the lock will set in. This is also a factor in accidental closing philosophies.

The locking mechanism on my New Ranger knife is as new even after years of testing.

The Wenger knife is a perfect design in itself and all the components function as one entity. The forces during motions that distribute into the knife are perfected in the design. There is no flaw in the design. Every function is balanced in dimensions and performance. The SAK is a very advanced



……….Yes the SAKs are very advanced knives and the locking mechanism the same. In my article I did mention that a knife shall be used as if there is no lock at all. This is the key philosophy in knife use and for the locking mechanism type. For sure you must press the emblem button to release the blade folding in. With mechanisms for preventing accidental closing it is important that you learn to use the knife as there is no lock because this will save wear on it and it is the safest way to use a knife,  when you have a traditional slip-joint knife you are safe and sound and do not forget.

It is important that you open the blade controlled and with a secure grip. In my videos I did show a few things for speed. This is absolutely not the safest for everyone and people can get injuries and so on. It is usually not about opening it the fastest or having fun with it. I have had much fun with it that said. Mechanisms and constructions are educational and important for the knife evolution. If anyone says folding knives with locking mechanisms are not necessary they are wrong plain and simple.

There are many tactical knives in the US or in the world that makes knives for safety or rescue with mechanisms. A spring assist knife can be helpful for many. One hand opening blades are in my opinion evolution in knives. A Spyderco Tenacious can in many ways be better than a fixed blade knife because it is so easy to open and close. It takes very little place and for a person that would work in an office or in a storage facility would have this as the best choice for his work. It is not about combat at all.

Folding knives are also excellent backup knives.


Opening or closing a Wenger 130mm in the most controlled way is with both hands. With training it is one hand all the way.


safety tips:

do not walk around with a open blade

have a secure grip always

have in mind the direction of a cut and where the blade would swing

do not point it at people

never let the knife with open blade on the ground

open and close it secure

have the SAK in a pouch or in a pocket

do not cut with the edge towards you





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06.10 | 15:47

I agree

06.10 | 15:18

Yep - I have seen Packlock in lots of documentation too. It's just as a native English speaker I have NO IDEA what it means! :-O

06.10 | 13:50

In the Backpacker 1979, It is mentioned patented Packlock, by Precise. Google books. BR

06.10 | 13:35

Wenger europe used French language, It is possible error. Packlock became a name that followed it. It will be interesting to see. BR Trond

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