Rising butt hinge

The office bathroom has an unusual hinge on the cubicle door, which I’ve often wondered about while ensconced behind that door.

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What’s clever about that design is that the spiral shape of the joint makes the door close itself automatically, as the weight of the door pulling downwards is transformed into a torsional motion.

I finally learned today that such hinges are called rising butt hinges, and that one popular use of them is for doors in rooms with heavy carpeting – the door lifts upwards slightly as it opens, and in the process is able to clear the carpet layer.

What a simple, elegant design!

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