The Nested Lock-Bar?

[DrFish]

It seems all the tension on the lockbar has transferred onto the screws so the lockbar itself actually not taking much of stress. No idea if that's good or bad.

That would be bad. You want the tension on the lockbar transferred to the frame. The screws are just there to hold it in place, they shouldn't be taking much stress at all. As said above, some people even dovetail it in place making the screws almost unnecessary.

 

[nosaj750]

Thanks for the pics Walter!!! Really like the design you have there. What kind of material do you use for the lock?

 

[Bob Ohlemann]

This is not a new idea. Bob Terzuola shows how he does it in his (long out of print) book. The ultimate effectiveness/strength of this arrangement depends on the makers understanding of material yield strength and forces applied. If the lock system is depending on screws in shear to bear the force of a spine whack test, it will probably fail. If the load is transferred through the body of the knife by a relatively large, precision, contact surface, it should hold well. There are several makers who are dovetailing in the lockbar on lightweight carbon fiber knives as a means of getting the weight down to the absolute minimum. Many of them have only a screw holding them in place and would be a fail on a larger knife but, how much abuse should a 1.5 ounce knife be subjected to anyway? I would say it is a good system that ultimately is application/maker dependent.

Bob

 

[Lycosa]

Thanks, Bob.
I recently found out about Bob T and this lock and his book.
I just love this locking system. And, some makers told me that's it's less complicated to make that the other lock systems.
rolf