Is it possible to have 2 locks (compression and frame) in the same knife?

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guitarted

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I mean for both sides of the tiframe to collapse in at the same time locking the blade from the two sides (oposite sides- one upper and one lower )for making an even stronger lock say for big choppers.

I know this is possibly stupid but I am asking from an engineering point of view.

The only problem then would be designing the (disengage) mechanism to make this type of lock close in one movement.

What are your thoughts? Has this idea been attempted? are there any obvious reasons this couldn't be done?
 
It could be done. I don't know why anyone would want to do it. Not only would it increase the cost of the product unnecessarily but it would make it fussy to use.
 
I personally can't stand the compression lock, from an aesthetic point of view, as well as a user point of view.

I think that would be silly to have a lock system like that, one on top and bottom.
 
One work. Spyderco Lockback.
I can understand the desire to have a secure knife. Lockbacks aren't as easy to open and close, and no lock is ever infallable, BUT, Spydercos are a sure bet.
If you're really that worried about it, I suggest getting a small fixed blade pocket knife from Bark River. Maybe a stainless MicroCanadian.:cool:
:thumbup:
There's no harm in the desire to protect your fingers, and a small fixed blade will take up no more room in your pocket. You could even get a clip sheath for it.
 
CRKT has the LAWKS system which blocks a liner lock so it can't close until the LAWKS is released first. MOD has a similar system for their button-lock CQD knives.

There comes a point when you're going to engineer in more places to fail, instead of making one single strong reliable lock for the knife instead.
 
I think Farid made something like that at one time. A real SUPER stout folder.
I think it's been sold a few times, probably because the owners got sick of disengaging the darn thing. ;)
 
It would be a PITA to use, and probably impossible to close one-handed.

The Schrade Lake & Walker is one knife with a double lock. It's a frame lock design, with an extra safety lock. If you want to engage the safety lock, it's available but optional. With a double-sided frame lock, there'd be no choice about using the second lock.

Also, I'm wondering about the structural effects on a double frame lock. I wouldn't want both handles to be carved open like that.

-Bob
 
It sounds like the extra security (having 2 liner type locks)
is wanted because liner/frame locks have been getting bad press lately.

If a liner/frame lock is done right (this includes integrating
it into the handle so you don't accidently unlock it while torquing it)
it is safe and reliable. So that would negate the reason
for two locks.
 
Doesn't Bob Dozier have a lock that comes from the top and bottom, like this?

Although my opinion is that if you have both liners cut, you weaken the integrity of the liners.

Also, the problem with chopping with a lock'd knife is more that the impact is going to keep hitting the lock or stop pin. This is much more troublesome than a slipping lock, especially in a chopper-style cutting device (most of the force is edge-directed, not spine-directed.)

-j
 
biogon said:
Doesn't Bob Dozier have a lock that comes from the top and bottom, like this?
Click to expand...

Not exactly. His "tab lock" is a liner lock that engages the entire tang from top to bottom. This eliminates the need for a blade stop. But it is a simplification, not an added lock.
 
Pointless to have those 2 locks since either of those 2 locks will be way stronger than the pivot in the first place. People worry way to much about folder locks. The current styles around tend to work far beyond our ability to break them when made correct. Even liner locks are easily tested and inspected. If they are well fit and the thickness is good they will not break. The pivot is usually the first weak point to give unless you count noobs snapping there tip off.
 
Esav Benyamin said:
CRKT has the LAWKS system which blocks a liner lock so it can't close until the LAWKS is released first. MOD has a similar system for their button-lock CQD knives.

There comes a point when you're going to engineer in more places to fail, instead of making one single strong reliable lock for the knife instead.
Click to expand...

I have had a CRK&T knife with LAWKS system open in my pocket, many years ago. I got rid of the knife ASAP.
 
BigJimSlade said:
Pointless to have those 2 locks since either of those 2 locks will be way stronger than the pivot in the first place. People worry way to much about folder locks. The current styles around tend to work far beyond our ability to break them when made correct. Even liner locks are easily tested and inspected. If they are well fit and the thickness is good they will not break. The pivot is usually the first weak point to give unless you count noobs snapping there tip off.
Click to expand...

most peoples pivots are thicker than 1/16";)
 
It would not be quick, but how about a lock-back or an Axis-lock that also has a collar-lock like the one found on the Opinel?
 
TheKnifeCollector said:
I have had a CRK&T knife with LAWKS system open in my pocket, many years ago. I got rid of the knife ASAP.
Click to expand...

That's a result of CRKT's love of very very weak holding-shut ball detents, for some unexplained reason.

I had a couple of early-model M16s that, for whatever reason, had utterly ZERO holding-shut power.

However, LAWKS shouldn't affect the holding-shut power, just the 'inadvertant unlock'.

Although I HAVE heard of CRKT knives disengaging WITH the LAWKS engaged... although it seems to be due to the LAWKS washer/bar -bending- out of shape from lateral liner pressure.

-j
 
biogon said:
Ah ha.... I misremembered, then.



-j
Click to expand...

No, you did not misremeber, Dozier had a knife with one liner lock for the blade, and another liner lock? on the other handle side that was for the blade stop. It was engineered so you did not have to manually move the blade stop liner tab to close the blade. :) It simply pushed flat with closing.
Tom
 
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