Published at Thursday, 12 December 2019. Tonneau Cover. By Ararinda Hartmann.
Most of today"s hinges developed from refinements of the basics of these simple designs. A common door hinge has open rings (sockets) on both the door and the frame and a pin (post) that runs through the rings. If that sounds familiar, it;s because it still uses the basic physics of the original pivot hinge developed over 3500 years ago.
These simple ones were called pivot hinges and consisted of a post that fits into a ring or a socket. If you put a post on the top and bottom of each door and a socket in the floor and top of the doorframe, you have a simple door that swings open both ways. Other mountings of them stop the door at a certain point. An example of an ancient pivot hinged door with a stop is a drawbridge. Two massive pivot hinges were mounted on the bottom outside corners of the castle; chains raised the bridge into a door position which was then barred from the inside to hold it in place.
Ancient pivot hinges wore out and were subsequently reinforced with metal. Eventually they were made only of metal. As advances in metallurgy made metal stronger, they could carry heavier loads. They were also advancing by being downsized and used in homes; on doors, trunks, and boxes.
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