Floor spring
Floor springs, relate to door closing systems, also known as door closers or floor door hinges, as opposed to sprung floors which refers to floor systems that are designed to absorb shock and used for example in dance halls (see article sprung floor)
A floor spring is defined in the Guild of Architectural Ironmongers publication 'Glossary of architectural hardware terms.' as 'A hydraulic unit fitted to doors with heavier duty requirements. They are used in place of the more standard face fixed door closing device. They are set into the floor underneath the door and are covered by a metal cover plate, made in either stainless steel or brass finish. They can close the door in either single or double action and can also be held open electro-magnetically as an integral part of the unit.
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