Strongest, most reliable (and more) folder locks

Joined
Feb 7, 2000
Messages
3,221
Well, after what happened with the other lock strength thread, here's a new start. Here are my rankings (all assume ideal specimens of each lock design, so don't complain about the el-cheapo liner-lock which closed by pushing on the spine with your hand, only discuss the locks as the should be made) (locks which are not included are ones which either don't appear in current knives, or which I have no experience with, or the balisong-type lock, since I consider balis more of a fixed blade with can fold than a traditional folder
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):

Initial strength (how much it takes to damage the lock):
1. Frame lock
2. Axis Lock
3. REKAT's Rolling Lock
4. Sog's Arc Lock
5. Linerlock

The frame lock is just plain strong. The Axis follows next with a thick pin to take the force. The Rolling lock follows closely with a decent pin of its own. The Arc lock is currently pivoting on its much thinner pin, and the liner lock is being a typical liner lock.


Final strength (how much it takes to make the lock fail):
1. Frame lock
2. Axis lock
3. Sog's Arc Lock
4. REKAT's Rolling Lock
5. Liner lock

In this case, the Arc Lock's lock-pivot pin has sheared, converting it into pretty much the same thing as the Axis lock and bumping it up a notch, although the knife is now damaged significantly.


Wear resistance:
1. Axis lock
1. Frame lock
1. REKAT's Rolling Lock
(the above three are so close during normal use that there is almost no difference, however, I did place them in order, if you actually care about a margin that small)
4. Sog's Arc Lock
5. Liner lock

The only note I really have here is that, if you have more of a tendency to abuse knives, the frame lock may jump to number 1, as it's lock bar can act as a spring and absorb impacts with little damage.


Resistance to dirt:
1. Frame lock
2. Axis lock
3. Sog's Arc Lock
4. REKAT's Rolling Lock
5. Liner lock

Shouldn't be much controversy here. The more open a design, the less dirt accumulates, and the easier it falls back out when you pick the knife up.


Ergonomics (these are for me, since ergonomics depends on the person using the knife):
1. Axis lock
2. Sog's Arc Lock
3. REKAT's Rolling Lock
4. Liner lock
5. Frame lock

Both the Axis and Arc Locks are fully ambidextrous, which is a huge plus to me. Liner locks and frame locks sometimes stick, so they are a little lower, and the ability of the liner lock to have contoured scales in place over the liners bumps it up above the frame lock for general comfort.


So, there you have it.
Some caveats are:

1. Folding knives are folding knives; do not expect the same from a folder as from a fixed blade.
2. Try and get in the habit of assuming that the knife does not even have a lock when you are using it.

How this works:
-If you just want to flame me, save it for somewhere else.
-If you want to actually suggest a change in my rankings, please post actual reasons and back up your statements.
-The only reason my own statements aren't more thouroughly backed-up is that I didn't want the post to get too long; feel free to ask me to back anything here up, as long as you do it politely.
-Everyone is free to post their own ergonomics rankings, since that is solely personal choice.
-Yes, I know I left out lockbacks and many other locks; don't point that out as if it were a revelation.
-Keep posts on-topic; if you have something to say about something off-topic, by all means, start your own thread, but keep this one on this topic.
-No posts about locks which are not currently in existence (ie, something which is not available to the public at this point in time).
-Above all, let's play nice, shall we?

--JB

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e_utopia@hotmail.com
 
Well, I didn't read any of that other thread and I kind of don't want to wade through it now that it's locked (pun alert). So, I have three quick questions.

1) What are the above rankings based on; survey, testing, direct observation, or theoretical reasoning?
2) Why weren't lockbacks included, as they're the most common locking mechanism?
3) How about ranking the above locks on carryability? For instance: it seems like the axis-lock might be more uncomfortable to carry because it has little nodules poking out.

[This message has been edited by cerulean (edited 08-31-2000).]
 
1) all of the above
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No, I don't have the money to buy a bunch of knives and break them, but the above is very much a conglomeration.
2) Lockback weren't included because I just don't like them, personally, so I have never taken the time I did with the other locking mechanisms. If you want to include your view on lockbacks, by all means do so; that's why I created this thread.
3) Carryability is included in my ergonomics category to some extent, but it is ususally more a function of the knife than the lock, so it is not a big factor. FWIW, I never notice the 'nodules' on the Axis locks, but I tend to wear loose clothes, so I can't comment on how they might feel in tighter clothes.

Finally, since I recieved an email questioning why I started this thread so soon after the other was closed, I wanted to say that my intent was to get the same information as the other thread, but establish from the very beginning some rules.

--JB

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e_utopia@hotmail.com
 
e_utopia - sorry, it is not at all clear to me how you obtained the ranking you wrote. Can you please explain how you tested them? Or if you didn't test them, then how did you came to the conclusions?
I'm definitely not trying to raise a fight - I just what to know what your long post means. You see, you present these results about the strengths of different locks without any reference to the source of the findings or the method.

I must add that it's an interesting topic... Although I believe that these all are very good already for my usage
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Hugo.

[This message has been edited by Hugo (edited 09-01-2000).]
 
I am wondering where the variants on the liner lock and frame lock fit into this scheme. The Benchmade 330 and the William Henry Evolution series have exposed liner locks, adding a bit more reliability to them. Allen Elishewitz’s Bolster Lock, also used by Pat Crawford on the Janus, allow the use of inlayed scale materiel on the handles, and both Allen and Darrel Ralph are adding overlays to their frame locks. Chris Reeve Knives has virtually transformed the Sebenza with the Wood Inlay models, both in appearance (these knives are no gray turds), as well as ergonomics.

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James Segura
San Francisco, CA
 
No flames here. While I won't argue with the rankings, I still think the difference between the Axis and Roller are so slim that I'll pick between them based on the OTHER features of the knife, especially blade length
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but also grip ergonomics and blade steel.

As an example, a given BM Axis piece might be slightly stronger than the Carnivore, and of a similar blade length class...but I know of no BM that'll match the Carny for combat grip ergos.

Another thing: last night I handled a Mission frame-lock and was highly disappointed. The clip position made it IMPOSSIBLE to reinforce the lock strength with your own grip!!! And apparantly that's not all that uncommon. In these cases, unless the clip is removed and discarded, lock strength drops in my opinion.

That's not a LOCK flaw. The Sebenza avoids this trap.

What else...aren't the Arc Lock estimates still purely theoretical pending more detailed testing? Not to knock SOG, I really like much of what they're doing but...there's theory, there's maker's claims and then there's people like Cliff wailin' on 'em
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.

Jim
 
Regarding Cliff: it's worth remembering that he's focused on "heavy utility" as opposed to street self defense hardware. Which is fine; I'm pretty sure he'd agree and I don't mean it as an insult. His types of test are valuable, so long as you understand his "biases" in terms of purpose.

In my view, the connection between the grip and the blade of a folder needs to be "good enough" - but the connection between your hand and the grip is MORE critical. Right? Particularly on a hard stab when the tip stops and your hand doesn't want to. Or you need to subtly shift from a "reach" grip to a "Gorilla" (or "hammer") grip. A failure of YOUR personal hand is more likely than any other type even on most linerlocks. Hands are squishier than G10, Zytel or steel
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.

So is the Rolling lock "lesser" versus the Axis? Probably...but not to such a degree that it outweighs REKAT's sheer genius at doing combat ergonomics at a level BM doesn't even dream of or doesn't have the "gonzo guts factor" to emulate
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.

That's why I tend to scroll past long discussions of engineering. I personally test the locks in my street-carry folders. Like Steve Harvey, my experience with the Sifu's lock is 100% positive.

Jim
 
I hate to be so boring, but I've never had any kind of lock fail on me during use, so one of the things that I look for in a lock is how easy it is to unlock it and close the blade with one hand. That's one of the reasons I like liner-locks; they're really easy to unlock.

Some of these newer locks seem like they stick a lot or are just awkward to unlock. I don't know; maybe it just takes some practice manipulating them.
 
I'm with you cerulean. There is more to a knife than how much negative load, and spine whacks the lock can take.

I am not against product evolution. In addition, I am for making safer products. However, as cerulean points out, feeling comfortable with a particular lock/knife mechanism is most important. An Axis lock is meaningless if a person can't manipulate the damn thing.

BTW, what the heck are some of these people doing with their knives which inflict such brutality? Geez, get a small fixed blade.

P.S. Please, no far-fetched replies like, "What if I'm defending myself and some guy whacks the blade of my knife with a Louisville Slugger?" I say, "Run like hell."

 
Hugo, these are based upon a combination on personal experience, testing (by myself and others), and some amount of theory (but only theory which is pretty simple and straightforward; nothing far-fetched).

stjames, good question. I'm really not sure about the liner-lock variations. Since this design tends not to be on hard-use folders, I really hadn't given it much thought. I guess I will have to, now
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As for inlays on frame locks, I definitely note and improvement in ergonomics with the inlays. Not enough to overcome the best (remember, we're looking at ideal specimens, here) that a liner lock can be, but it fills the hand much better.

Jim, that's pretty much what I'm going for; this is just lock information, but a knife is a combination of many things in one item. People who choose solely upon the lock (assumeing it isn't faulty, that is) generally end up fairly unhappy with the knife.

As for the Arc Lock, the rankings should hold out through more detailed testing. That is why I did not attempt to say how close the margins were between dirrecent rankings. An interesting thing to note is that I was forced to differentiate between initial and final strength because of the 'two-stage' design of the Arc Lock, and I think this might be a nice feature, as you know when you puched the knife too far, and can avoid pushing it farther.

I've been trying to convince Benchmade to do some Axis lock combat folders, just to see them and REKAT go head-to-head, but they have been unresponsive as of yet.

cerulean, one of the things which pushed the Axis higher in my ergonomics ranking is ease of operability. I like being able to open and close one-handed (either hand), without putting my fingers in the path of the blade. I have not found it awkward, but that's me, with my hands, and what's important for you in choosing a knife is if it fits you, not me (unless you plan on buying a bunch of knives and giving them to me
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).

FTC, see my response to Jim.

--JB

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e_utopia@hotmail.com
 
The above seems like a reasonable swag, but without knowing what parts are direct testing and what parts are theory, it's hard to judge. Theory sometimes is wildly proven wrong by a little testing.

In the strength testing, for instance, everyone (including me at one time) has been theorizing that the Axis, which depends on shearing an intact pin, is stronger than the Rolling Lock, which depends on shearing a pin with a cut-out. But there are all kinds of variables here, especially in regards to implementation. What if REKAT is using a better steel for their pin, or is heat treating it just right? What if there's some weird angles on the Axis implementations that cause stress somewhere. What if, for practical purposes, the liners bend before the pin shears on either lock -- doesn't that mean that any theoretical difference in lock strength has no practical implications?

Wear resistance and tolerance to dirt can theoretically have the same kinds of issues. Especially in the case of wear resistance, I haven't seen any direct tests of this. We've all had liner locks and seen wear, and seen the same with integral locks (at a slower rate). But neither my rolling lock nor my axis seem to have had any wear at all, so I'm having problems judging.

Anyway, all those caveats aside, interesting topic, and I'm kind of hoping it's going to generate a little flurry of testing. In fact, I'm mulling over picking up an Arc lock knife (even though I don't like the current SOG ArcLock offerings and was going to wait until they came out with something I liked better), just to do the dirt tests.

Joe

 
e_utopia - Where did you get your figures from?

According to Sal Glesser's Testing the Rolling Lock came in a lot higher than the Integral lock in their testing and they have a machine that tests this scientifically. Sal's exact words were -
http://www.bladeforums.com/ubb/Forum20/HTML/000573-2.html

Stompy - We've only tested a few of Rekat's Rolling Lock knives, more as a favor to them so they can refine and develop. Really can't say which is the strongest.

They tested very favorably. Stronger than any other lock we've tested. Sometimes the steel in the knife makes a difference, but most of the knives that we've tested will destroy the knife before the blade steel actually breaks.

If the blade steel breaks, this generally tells us that the hardness isn't ideal and permits us to go back to the heattreat. It is a deveolment tool for Spyderco.

The Rolling Lock tested stronger than any of the liner locks that we have tested so far, but that doesn't mean that there aren't some out there that are stronger than those tested.

There were exact figures in there somewhere, but I forgot where - do a seach in the Spyderco Archive for "rolling lock" and you will be able to find them.

Spark

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Kevin Jon Schlossberg
SysOp and Administrator for BladeForums.com

Insert witty quip here
 
Originally posted by cerulean:
I hate to be so boring, but I've never had any kind of lock fail on me during use, so one of the things that I look for in a lock is how easy it is to unlock it and close the blade with one hand. That's one of the reasons I like liner-locks; they're really easy to unlock.

Some of these newer locks seem like they stick a lot or are just awkward to unlock. I don't know; maybe it just takes some practice manipulating them.

You have a good point on the liner-locks. Imagine how awkward Emerson's "The Wave" on an axis or rolling lock folder.

Another criticism from Bob Kasper is on the location of lock release. He expressed some concern with Pat Crawford whether it could be accidentally disengaged during combat. Again with my 0 combat experience so I have no comment.

Anyway, now we 've found one formidable lock: namely the Turber Lock (TM).
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Dew.

 
e_utopia,

Just to let you know my knock wasn't against you, your opinions, or even lock-testing in general. I'm very supportive of it all, and would agree with your hypotheses.

My knock is to people who always have some bizarre reason for needing an industrial strength lock. If that's the case, their needs would be better served by a good, small fixed blade.

I'm not kidding. The "Louisville slugger" comment is based on an actual response someone gave at another thread.
 
FTC: California law radically favors folders
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. We can conceal ANY length non-switchblade folder, and if it's got a thumbstud/hole/disk/etc they can't "declare" it an auto or "gravity knife".

So we buy folders. BIG folders, if desired
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.

Jim
 
Joe, this is based on theoretical 'perfect' examples of each lock, merely to compare the lock systems themselves. As for wear resistance, similar devices are in use in industry, so their wear properties are fairly well known.

Spark, these comparisons are based upon many different sources. Reports from people who have caused similar knives to fail, direct testing by me, some level of theory, as well as observation of similar devices outside of the knife world.

As for Spyderco's testing, with the integral lock coming out lower: if I understand the machine being described, there is nothing pushing in on the sides of the handle, so the lock is not being reinforced as it would be if someone was holding it. Also, I would like to see more of their set-up, since the size and shape of the contact area where the force is applied could affect the validity of the results.

FTC, I wasn't taking any offense, I merely didn't want to say the same thing twice, since my response to Jim was basically the same as what I would have said in response to your question. This is mostly academic, as quality locks will basically never fail in any vaguely acceptable use. My prefference for the Axis lock is mostly due to ease-of-use, not strength. (just an aside: who was it who thought the knife was going to get hit in the spine with a bat, and not go flying out of his/her hand?)

--JB

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e_utopia@hotmail.com
 
Here I'm with Joe again. It is no way to consider purely theoretically which lock is stronger, more reliable, wear resistant etc. Too many variables can obstruct this kind of evaluation. The nearest example is the liner lock. It's performance can vary from very good to completely pitiful - all depends on used materials, execution tolerances and some factors more.

Also, the stories collected from people who had lock failure or breakage do not display too much because it is no chances to compare the conditions caused these failures.
Example: I did break only one knife in my life though I'm 47 years old and since my father gave me my first penknife as gift on my 7-th birthday I always have a knife within my hand's reach. For comparison, Cliff Stamp seems to break his knives on a regular basis
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Maybe I'm a wimp, maybe Cliff has worse luck, maybe my knives are stronger, maybe life conditions in Canada cause more and harder knife use, maybe we have quite different weight categories, maybe we have quite different approach to knife use, maybe, maybe, maybe...
You see how many variables here are
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Only tests preformed according the same methods could answer these questions. I think this is only way for more or less scientific comparison.

And here is my addition: we can't to test the lock by itself because it is the integral part of certain knife. Thus naturally we would test knives equipped with particular locking devices. The knife A equipped with X-lock could be stronger than benchmark knife but it is absolutely no warranty that the knife B equipped with the same lock will be stronger also. Another design and/or used materials can cause a huge difference in test results.
So the test would display what knife but not locking device by itself is stronger, more reliable, wear resistant, etc., etc., etc.


[This message has been edited by Sergiusz Mitin (edited 09-02-2000).]
 
Okay, I think there has been a certain amount of confusion. The purpose of this thread is to look at ideal specimens of each lock, to compare the potential that each lock has, independent of what materials are currently being used, etc. If the purpose was to compare current knives using these locks, there would be some very definite answers, and the results could be testing. What I'm asking for (and presenting) here are opinions as to the potential each lock has, assuming that all other things (materials, manufacturing quality, etc.) are held equal. Does that help?

--JB

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e_utopia@hotmail.com
 
e-utopia, I have been following this thread with interest, and here is a point I want to bring up. The Rolling lock indeed beat the framelock in Spydercos tests. I dont have the specs but a person can find them with a little digging. The rolling lock needs no grip pressure to enhance the strength of the lock. This to me is a reliability issue, and I will give the nod to the rolling lock and the axis lock over the frame lock for overall strength and reliability. There are some great frame and liner locks out there, I just havent seen that many that were reliable though. Carson, Reeves and Ralph's are the ones I would pick though... Just my dimes worth.

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www.simonichknives.com
 
Besides which - if a knife relies on the pressure that your hand provides to keep it's lock reliable, then it's not a knife I'd want to rely on!

I doubt that any of us here could put enough pressure on an AXIS lock or Rolling Lock where it would make a difference if we were gripping the knife tight or not when it failed - and if I understand the mechanics correctly, the knives tend to self destruct before they fail, with the liners failing completely - something I doubt the prescence of my grip would in any way affect.

Spark

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Kevin Jon Schlossberg
SysOp and Administrator for BladeForums.com

Insert witty quip here
 
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