A hinge that you could use on a mailbox. I've been looking for one. I'm not sure if there is one.
You can check
www.3dcontentcentral
www.grabcad
Also check
McMaster.com
they have all sorts of hinges
I use Guden
Guden Hinges and Industrial Hardware: 3D CAD Models
You can check
www.3dcontentcentral
www.grabcad