Loose Pin Hinges

While they are hinges, loose pin hinges are not meant to be used on doors or anything that typically swings open. These hinges are designed to connect Broadway flats together. The loose pin allows the flats to quickly come apart for storage or transportation.

Typically there would be two to a side, about a third of the way in from the top and bottom. If every connecting flat has them in the exact same location, then flats can be easily interchangeable. 

By placing the hinges on the backside of the flat, there is no need to paint them (as these old ones were). In this way you can have a long run of flats that comes apart quickly.

Do not use Loose Pin Hinges to create a book fold of two or more flats. They are not designed to provide that much support and easily bend and twist, making it even harder to insert the pin again.