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Another term is 'concertina' doors, inspired by the musical instrument of the same name. Folding doors can be used as internal or external room dividers and are made from a variety of materials. Most folding doors are glazed and the panels have frames of either wood, aluminium or upvc. They can open up and fold either internally or externally ...
A concertina is a free-reed musical instrument, like the various accordions and the harmonica. It consists of expanding and contracting bellows, with buttons (or keys) usually on both ends, unlike accordion buttons, which are on the front. The concertina was developed independently in both England and Germany. [1]
Note the internal lines of gabions to reduce and compartmentalize mortar effects. The Concertainer , [ 1 ] known colloquially as the Hesco barrier [ 2 ] or Hesco bastion , [ 3 ] with HESCO being the brand name of the manufacturer, is a modern gabion primarily used for flood control and military fortifications . [ 4 ]
Closing your interior doors can help disperse pressure throughout the home and reduce the overall force stacked up against your roof -- basically your first line of defense against Mother Nature.
The most notable innovations to the internal construction of the Chemnitzer concertina were made by German-American instrument builders in Chicago: Ernest Glass patented an aluminum action in 1912 (U.S. patent 1,024,771), which was quicker and quieter than earlier wooden actions; his son Otto further improved this action in 1928 (U.S. patent ...
Concertina wire or Dannert wire [1] is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina.