two locks

jefroman

jefroman

Gold Member
Joined
May 17, 2001
Messages
774
Why doesn't a knife company make a new folding knife with two locks. Because then, if one lock failed for some reason, the other one would already be engaged. Would this idea work if you used a liner lock and a lockback?
The opening just wouldn't be as smooth, and it would take longer to close because you would have to disengage two locks. I guess if it was done with a liner lock and a lockback, you would have to hold done the lockbar while pushing the liner out of the way. Anyway, it's probably a dumb idea but I was just thinking.

Jeff
 
I don't know about the two-lock idea, but I've been clamoring for a one-hand-opening, two-hand-closing knife for a while. Safety first, kids.

Sal Glesser mentioned that he has a couple of knives like these in the back of his mind.
 
Originally posted by Shmackey
Sal Glesser mentioned that he has a couple of knives like these in the back of his mind.
Click to expand...
Sounds painful :eek:



Seriously, the MOD CQD is another with a secondary safety. Not exactly two seperate locks, but about as close as you're going to get.
 
The CRK&T Crawford and Kaspar knives, and Gerber Covert have liner locks with safety devices. I think these work very well. Well enough that I still own a Covert, and it is in my regular carry rotation when I want to carry something pretty light.
 
The now discontinued Spyderco Centofante models (C25 and C50) had two locks: a nested liner lock and the Centofante-designed SecureLock.
 
None of the knives mentioned above has two locks--just one and a safety--and none has the feature I'd be thrilled to see: I want a knife that *requires* me to use two hands to close it.
 
One of the reasons why I think linerlocks are silly is that I can close all of my linerlock knives with one hand. And it's not like some kind of trick; just hold it pointing forwards, depress the lock so the blade swings down, and then move your hand so that you can complete the closing with your index finger.

I guess what I'm looking for is a knife that *will not* close without some kind of two-hand contortion/combination.
 
Jeff -- I think that basically you may have a good idea. However, it does not seem like the knife world or manufacturers necessarily share your safety concerns. Tho I am not as leary of many liner locks as many forumites are, I do agree that they offer the greatest potential for accidents and injuries.

I suggest you keep thinking about this. Not just the concept, but how it actually might be done. I think simplicity is pretty important, but not at the expense of your basic idea of safety. You have to look at how difficult or easy things are to manufacture. More manufacturing steps means higher cost.

You're young enough to spend some real time thinking about such things. I'd do as many drawings as you can. Be better if you could do them on a computer, so you could more easily store your ideas, and put notes with them, etc. Don't have your eyes fixed too firmly on the goal. SPend some time looking where you're putting your feet, so to speak. I think a lot of important htings have been invented while people were trying to invent other things. You wouldn't want to miss something like a great lock idea, just because it wasn't part of a 2-lock system. Think about it, if you could design an absolutely certain lock that could not fail, then maybe there wouldn't be any need for a double lock system.

Good luck.
 
Originally posted by Shmackey
...........

I guess what I'm looking for is a knife that *will not* close without some kind of two-hand contortion/combination.
Click to expand...

Try this one:

View


The neeley-lock
you have to pull the blade out ohe front and the spring is very stiff.

:cool:
 
Originally posted by Shmackey
None of the knives mentioned above has two locks--just one and a safety--and none has the feature I'd be thrilled to see: I want a knife that *requires* me to use two hands to close it.
Click to expand...

Sorry, have to disagree with you: the SecureLock doesn't prevent the liner lock from disengaging, it prevents the blade from closing. That makes it a locking mechanism, not a safety.

One of the reasons why I think linerlocks are silly is that I can close all of my linerlock knives with one hand. And it's not like some kind of trick; just hold it pointing forwards, depress the lock so the blade swings down, and then move your hand so that you can complete the closing with your index finger.
Click to expand...

Yes, that's what many of us like about liner locks -- one hand opening and closing. One good feature I've found with the Ken Onion Speed-Safe design is that the blade can't just swing closed when the lock is released; the torsion bar stops the blade about half-way open.

FWIW, I think Bugs3x is right on target. You have an idea that may be the basis of a useful (and maybe even profitable) invention. Keep your brain working at it in its spare moments.

Meanwhile, if you want a knife that won't close on you accidentally, your only real choice is a fixed blade. Folders are called that for a reason.
 
bigbore, those thing are pretty sweet, i saw a few a recent knife show but i didn't buy them since i've been trying to cut back on the frn :D. it'd be fun just to show to my friends and watch them try to close it.

- Pete
 
I've always thought that a combination axis style lock combined with a lockback would work great. Something that locks the blade in place after the lockback is engaged either by engaging the blade or stopping the spring from moving up and realeasing. It would definately require two hands to close.
 
check lout the spyderco centofante and the CRKT kasper, kasper pro, and point guard, among others.....


sifu
 
I'd forgotten about the Neeley lock. Sure seems to me to meet Shmackey's criterium. A device/mechanism that requires two hands to close the blade. I got one with a Gatco sharpening system I bought, but never used -- the knife either. Wonder what became of it??

Course, have no idea as to how strong that lock was. Given the need to pull out the blade, must have been something fairly solid in the way of the tang rotating.
 
I'm trying to figure out Shmackey's reasoning...

Speaking purely of utility, if I have a need to open a knife one-handed (my other hand is otherwise occupied), I very likely have the need to make the knife safe again one-handed, after use. Why on earth would one hand opening be a good thing, and one hand closing be bad? Makes no sense to me.
 
An alternative safety measure dealing with unintended blade closure would be a pronounced choil that would allow the index finger to be fully placed in the choil. Thus, if the blade were to close accidently, the choil would close on the index finger, blocking the cutting edge from making contact with the other fingers. In this situation, the index finger would be pinched, but that's a lot better than the fingers being cut by a sharp edge. Not too many knives have a pronounced choil like this. Two knives with such a choil are the Spyderco Native and the Buck Odyssey, both very good knives.
An additional benefit of a pronounced choil is that having the index finger right next to the cutting edge provides for better control of the knife's cutting action. A drawback is a reduction in the length of the sharpened edge of the blade.
 
you want a nice long choil for your fingers? Buy a Spyderco C48 Wegner (senior).
it has the thickest blade from spyderco(up to that point, maybe the Chinook is thicker) and the choil is about 1" long... no way you'll cut yourself if your fingers are on it if the lock fails.
 
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