My idea for a 3 piece titanium or steel handle barrel knife

Now make one, one of the biggest issues of engineering is that engineers don't make what they design, someone else does so the designers never encounter real world issues. Everything looks good on paper it's when you put into practice what seems good in theory do you flesh out the real problems and see if your idea is a viable one.

"Just what makes that little ol' ant think he can move that rubber tree plant?"

You might seriously want to consider having this moved to one of the knife making forums if your serious about trying out your idea. Either you'll find someone to make it out someone will talk you through making your own. Your design is not overly complex as you present it and you'll learn all the shortcomings and what works. That by it's self is invaluable information that will help you with future ideas.

Keep trying.
 
This titanium capsule looks like it would make a perfect handle if I could somehow open a slot on the bottom of the sealed end. The measurements are 4.49" x 0.79". I could get the outside milled to add a grippable surface.

exo-pol-stnd-open-large.jpg
 
Here's a little piece of advice, make the plug thicker, it'll give you more surface area to distribute the forces more evenly over a larger area. Also extend the blade tang beyond/through the plug and still a hole in the exposed end so when the knife is in its compact carry mode you could put a splitring through the exposed tang and put keys or a lanyard on it. The tang passing through the plug will also give added strength to weakest point the joint between your plug and the blade...

That one was on me, now let's see you get serious, finding existing components to modify is a great start, why rebuild what already exists modify it.
 
Keep in mind titanium is tough and expensive to machine, look for a softer more machine friendly material so you can do all the all the fine tuning yourself, the less figuring a fabricator/machinist has to do to make everything fit properly the less it'll cost and the more likely you'll find someone to make it gratis.

It's all about learning...
 
T. Erdelyi said:
Here's a little piece of advice, make the plug thicker, it'll give you more surface area to distribute the forces more evenly over a larger area. Also extend the blade tang beyond/through the plug and still a hole in the exposed end so when the knife is in its compact carry mode you could put a splitring through the exposed tang and put keys or a lanyard on it. The tang passing through the plug will also give added strength to weakest point the joint between your plug and the blade...

That one was on me, now let's see you get serious, finding existing components to modify is a great start, why rebuild what already exists modify it.
Click to expand...

Brilliant! Thanks!

I did look for capsules made out of other metals but they all have dual caps. This titanium one is everything the handle should be. It just needs the exit slot for the blade and maybe a machined grip added. Once I get over that hump I could get someone to make the blade and inner cylinder. I've decided the cylinder should angle inward as it goes further down into the handle, possibly into a flower petal or star-like shape to assure the round disc block never can slip inside the cylinder when in use.
 
orezona said:
What's interesting is from a patent viewpoint, this potentially has enough novelty to be unique.

Granted, I am NOT a patent attorney but I work with a good amount of engineers and have been included on a few patents so I've seen what goes into developing a patent.

The key here, and correct me if I'm wrong... Is that the knife blade is completely detachable from the handle and can be STORED within the handle when not in use, correct?

Something to note is that a folding knife has a pivot motion/mechanism that allow the blade to come out of the handle, whereas this design has the blade completely "free" of the handle and requires assembly by the user.

Now the trick part... What is the benefit over existing designs that would make this something worthy of a patent and give it a better likelihood of being issued? Is it because the blade is completely sealed in the tube? That the assembly of the blade to the handle keeps it from "lock-failure"? Not readily apparent from what's been described thus far.

Should you patent it, fsir? Not if you don't want to.
If you want to actually make a few and sell them to others, you're more than within your rights to do so but keep in mind that if you have a good enough idea that others want to steal it...
Click to expand...
Er. Except he's now disclosed the design, & so he can't patent it (except in the USA?)
 
Regarding the design, I can see a few easy improvements, & your niche market? There's a Scandinavian country where knives are only legal if it takes two hands to expose the blade.

I might knock something like this up next week. The handle storage and completely safe blade seem like a winner to me. Barring a likely fatal impact event that blade will never hurt you whilst stored!
 
nkt2 said:
Regarding the design, I can see a few easy improvements, & your niche market? There's a Scandinavian country where knives are only legal if it takes two hands to expose the blade.

I might knock something like this up next week. The handle storage and completely safe blade seem like a winner to me. Barring a likely fatal impact event that blade will never hurt you whilst stored!
Click to expand...

Have at it! Listen, I posted this as a totally open source idea with no conditions on it's use. So if you make this and want to sell a copy I might buy it from you if I like it.

I posted a few options for possible handles above that might make the work easier. I'm looking for it to have a blade at least as wide as an Opinel Outdoor No. 8. I don't know if the handle options I posted above will fit that size blade. But, obviously, later reincarnations of the design would have a new blade specifically designed to fit and work with the handle. That might require hiring a blade maker to first make a blade stub of the correct size to see if it would work and then, once it is determined to fit and function properly, get a better quality blade made.

I don't have the cash to throw down to make one of these right now but I might part with some money for a finished product. Again, if I like it.

There was another knife maker who posted a survival tube that also could be modified into a handle here:

http://jungletraining.com/forums/showthread.php?49435-New-Survival-Tube-Feedback-Wanted

I was hoping to find a concave cap that will fit on one of the handle options to accommodate a longer blade, of course. You might have to dispense with the preferred blade measurements in order to get a prototype made and then refine it later.

I posted a lot of design info in this thread but I'm sure you get the idea.

Btw, the titanium capsule whose pic I posted above can be found here, should you want to use it:

http://www.bladehq.com/item--TiSurvival-Exo-Tube-Titanium--12891

It, however, would be the more pricey route at $180, and you'ed have to carve a slot into it. But it has the perfect length already and that concave cap to accommodate a longer blade.

My idea has altered slightly from the original drawings posted to overcome a few design problems so if you get stuck, I can probably advise you. For instance, one poster speculated there would be an issue, when inserting the blade, of lining it up with the slot. I had to think of a way to make that easier for the user and came up with the idea of markers on the outside of the handle in parallel to the slot and markings on the blade disc (base) to indicate the angle of the blade when blindly inserting into the handle.
 
Last edited:
Has anyone tried to build this knife since I started this thread? Nkt2 said they might try but they haven't posted here since then.
 
You must log in or register to reply here.
Back
Top