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Modern manual door closer Eclipse door spring and separate checking mechanism. A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior.
Storm door, Japan. A storm door is a type of door that is installed in front of an exterior access door to protect it from bad weather and allow ventilation.Storm doors generally have interchangeable glass panels and window screen panels to provide visibility and prevent flying insects from entering the home.
On older houses, storm windows were installed in autumn when the window screens were removed; later homes had the pieces combined in one unit. Similarly, storm doors (also called "screen doors") allow similar energy savings for the necessarily less efficient primary doors – the screen allows for summer ventilation.
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Small, coiled torsion springs are often used to operate pop-up doors found on small consumer goods like digital cameras and compact disc players. Other more specific uses: A torsion bar suspension is a thick, steel torsion-bar spring attached to the body of a vehicle at one end and to a lever arm which attaches to the axle of the wheel at the ...
A storm shelter or storm cellar is a type of underground bunker designed to protect the occupants from severe weather, particularly tornadoes. They are most frequently seen in the Midwest (" Tornado Alley ") and Southeastern (" Dixie Alley ") United States where tornadoes are generally frequent and the low water table permits underground livings .
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