there are 1000s of hinge patents.
Here is the abstract of one issued in 2015
"A hinge device for a door is provided. The hinge device has two hinge members which engage with each other and a hinge cap. A bearing with one or more tapered ends engages with the hinge members to allow easy opening and closing of a door attached to the hinge device."
Yeah, other patents are problematic, but at least patents of yore were more like "here's my design for a door hinge. Here's a diagram showing my specific implementation. There are many ways to mount a door and this is one I've invented and physically produced. Anyone else is free to create a different hinge mechanism."
A modern software patent version of that is "I thought of the idea of a hinge in my basement. They've existed for centuries but I'll be the first to file. No, I've never physically produced a single one. Yes, any implementation of opening a door infringes on my system-for-opening-a-door patent."