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





16.01.2021 must be used correct

The Rangers use a liner-lock and by pressing the emblem you can fold the blade in. This is a very safe and nice detail. Larger knives cannot have the slip-joint alone to have a safe functionality. Larger functions and tools will naturally find use for larger things.  Having a locking mechanism will prevent accidental closing and on you will find information about this.

I consider one hand opening and locking mechanism to be perfect for larger tools. It is also so that smaller constructions and Swiss knives use such as well. Swiza use this for their Swiss knives. You can also find it on the Titanium models. Locking mechanisms is the detail that increases the safety very much. Even if you have such features it can be smart to use the knife as it didn’t have one. These mechanisms are not designed to be forced against the lock too much. Victorinox amplified the liner-lock on the 130mm SAKs. Even so it is not made to be brutal with. One must use the knives correct still.

Check out my pages with information!
See my pages on them. Can be opened with one hand and got additional functions on the blade that must have a locking mechanism.

14:14 Thank you

There are several locking mechanisms in history on SAKs made to prevent accidental closing. I am very grateful that you are visiting I hope you enjoy my updates and development for my page. I planned this many years ago. Now I will take a week rest from knives. I see you in a week! Best wishes from Trond

06.02.2021 accidental closing

Victorinox improved the locking mechanism used on the New Ranger knives. Still most of the aspects and factors are still the same about how and why it is there. It is a solid locking mechanism that is not so different from the type used on their 111mm liner-lock models. Victorinox continued the emblem as a push button to release the lock. By release I mean when you press the button you can fold the blade in. This button can only be used for folding the blade in.

It is still a slip-joint with a lock to prevent accidental closing. The new design will perhaps be considered to be a bit more than just this sphere. Basically a slip-joint even with a lock should never be used for stabbing. It is not good for the springs, functions and lock. Long blades with a slip-joint construction must have a lock for safety. If not the spring must have been much harder in tension and you would need additional designs on the tang. When Wenger made the locking mechanism and the push button release they had safety in mind. In their history they made mechanisms to prevent accidental closing. The information I have from Victorinox is the same. In the 70s Wenger implemented the lock for the 85mm for this reason and Victorinox in the 1980s made a slide-lock for the 111mm models. Wenger had a slide release for their Ranger models from around 1990. Then they implemented the New Ranger push button later as you know. There is no doubt that the lock used on the soldier knife 2008 type is solid and that a similar locking system would be used when Victorinox did some changes to them. It is the closest thing you can get to a professional outdoors tool today on a SAK. The 130mm and 111mm models are superb there. In general from all my research on knives in my life I have always learned that a slip-joint with such locks are there to prevent accidental closing. I have no doubt they can take some extra. The correct use in my opinion still involves correct use and care. The emblem button release is a very smart safety factor and it is part of the Wenger ingenuity which Victorinox continued with. One hand opening locking blades are very good safety knives.

There must be no doubt that the 120mm and especially the 130mm category by Wenger are very good SAKs. I believe they started using a very strong rivet material with their 130mm knives. Several knife people mention the superb design and construction on them. The Wenger 120mm and 130mm knives are also the closest thing to a professional outdoors SAK. 


There is an evolution to everything and several mechanisms are made in combination with the slip-joint sandwich construction in history. Liner-locking can be a good system for larger Swiss Army Knives. It is always sad when people use them for violence because they serve a very important safety reason for people. It means you can have larger functions and knives better equipped for professional use. In the outdoors for both services and civilians this can be a very important factor. People should not be afraid of mechanisms because it is a natural evolution and safety for knives. For sure locks are not new in history. On the 111mm Victorinox slide-lock models it is the slip-joint spring that becomes locked while a liner lock works differently as you see on my pictures. Wenger made a superb 130mm SAK too.

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26.07 | 23:05

Hi and thank you very much for question. The closest I know is the Master Fisherman 1.4753.72. The. 73 is related to what inlay it got maybe. Best Regards Trond

26.07 | 19:22

Hello Trond,
I received a Mechanic in a red/white Victorinox box. The box is stamped item number 1.47 53.73. Do you know what knife goes in this box? Not Mech

01.07 | 23:13

Hi, sure I would like to see, BR.

01.07 | 16:24

Hello Trond.

Would you be interested in seeing progress pictures
Of my custom Champ with Voyager digital clock scales.
I could email them to you.


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