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Living hinge out of metal

Postby nickbaker » April 26th, 2016, 12:18 am

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Hey all,

I am working on a project that involves sheet metal and would like to put a bendable hinge in the design. Essentially it would be similar to laser kerf bending.

What would be the best metal alloy to give me the most bends before breaking?

I've tested 6061 Aluminum and 4130 Steel. The steel lasted a decent amount before breaking, but maybe there is a better alloy.

Thanks,
Nick

Also, if any lawyers have some free time, can you explain to me why all the laser kerf bending projects don't infringe on Apples patent here.

http://www.google.com/patents/US20130216740

Re: Living hinge out of metal

Postby Sparkywan » April 26th, 2016, 2:38 pm


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Hey Nick:

Also, if any lawyers have some free time, can you explain to me why all the laser kerf bending projects don't infringe on Apples patent here.


I'm not an attorney, but it appears that this patent application has not yet issued and the claims shown in this "publication" may not be allowable in light of the prior art. The claims shown are essentially what the applicant hopes for. The true scope of the claims will be determined during the prosecution of the application. If the patent issues, the claims may be narrower in scope.

Hope this makes sense.

Scott

Re: Living hinge out of metal

Postby John_Moran » April 26th, 2016, 4:02 pm


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Hello Nick

If you want a metal hinge to last any length of time then you must make sure that the metal never yields. This means for the living hinge design that the flexure of the individual parts is small. You achieve this with thin material and fine strips.

Ordinary steel or aluminium will fail in this application. You need a spring steel or something like beryllium copper or some of the high nickel alloys such as Inconel X750. However, the latter two are very expensive, and beryllium dust is carcinogenic so I wouldn't recommend laser cutting it.

Regarding the patent, it should get thrown out on prior art. Unfortunately, the US patent system rarely takes any notice of the fact that something has been in the public domain for centuries and just grants patents willy-nilly and lets the lawyers make small fortunes fighting it out in court.

Kind regards - John

Re: Living hinge out of metal

Postby singletrack » April 26th, 2016, 4:12 pm


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Hello Nick
I worked on a personal product for my company Leaf Fly Fishing Equipment. That I used a living hinge in metal for. You can see the product here on my website

www.leafequipment.com

It will fail over time but it is a 1000 cycles or so before it fails which is fine for my application. I ended up using a Stainless Steel alloy that was stamped and kept a very thin piece between the outer and inner plates as the hinge. It works quite well if you don't over flex the part.

Re: Living hinge out of metal

Postby nickbaker » April 26th, 2016, 9:02 pm

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Thanks all!

@singletrack

This is what I am looking for. Do you know the exact stainless steel alloy that you used?

Thanks,
Nick

Re: Living hinge out of metal

Postby energ8t » April 26th, 2016, 10:42 pm


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Titanium works. Look at the Ibis Bow Ti bike. Uses Ti as living hinge.

Re: Living hinge out of metal

Postby singletrack » April 27th, 2016, 11:37 am


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Can we private message about that. It is proprietary to my company and I don't want to put it on a public forum. my email is daniel@leafequipment.com.

Re: Living hinge out of metal

Postby Lowe9 » April 27th, 2016, 12:53 pm

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I backed this on Kickstarter several years ago and the living hinge is still going strong after daily use and occasionally cracking open a bottle of beer.

http://www.amazon.com/Design-Premium-Gr ... B00IR3A71O

The carabiner is a titatnium alloy (unsure which) that is then EDM cut into shape.


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