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Molded In Hinges (not live hinges)

Postby themonet » December 11th, 2017, 1:09 pm

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Hey guys,

I'm working on a project that requires a simple hinge mechanism to connect two injection molded parts. I started looking into simple folded metal hinges, but I think I want something with a bit more premium feel. I thought about molded in hinges (like the ones on dewalt drill cases shown below, not live hinges). I started searching to find some design guidelines, but I can't find anything. I can't even think of search terms that don't bring up live hinge details. Any help would be awesome. Thanks!
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Re: Molded In Hinges (not live hinges)

Postby Cyberdemon » December 11th, 2017, 1:22 pm

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I would whip out your calipers and just use those as a basic dimension for your design. You can get some 3D printed parts to test and your tooling vendor should highlight any issues. If that looks the way I think it looks when it's open, it's just a basic C channel on one side and a cylinder on the other side (with a core out feature if it's thick enough)

Re: Molded In Hinges (not live hinges)

Postby themonet » December 11th, 2017, 1:54 pm

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Yeah, definitely good next steps. I was just hoping to google and find some info to quickly determine if there were any glaring errors before I put the time into CAD and prototyping. But it probably shouldn't be too much time to do that.
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Re: Molded In Hinges (not live hinges)

Postby AVClub » December 11th, 2017, 1:58 pm


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It seems with something that simple you would really start to run into determining a correct wall thickness based on your strength requirements which will be material dependent (I think?) Good luck, I am staying tuned.

Re: Molded In Hinges (not live hinges)

Postby ralphzoontjens » December 13th, 2017, 10:02 am

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Yes, these hinges are great - besides construction, a lot depends on the material used too that will determine the deflection force.
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