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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.
In 1954, Dee Horton and Lew Hewitt invented the first sliding automatic door. The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the 1970s.
A sliding glass door, sometimes called an Arcadia door or patio door, is a door made of glass that slides open and sometimes has a screen (a removable metal mesh that covers the door). Australian doors are a pair of plywood swinging doors often found in Australian public houses.
The MVG Class A of the Munich U-Bahn uses sliding plug doors.. Many passenger trains in the world use sliding plug doors: early examples of passenger trains using plug doors include the MVG Class A of the Munich U-Bahn from 1967, [3] the first batch of trains for Line 2 of the Milan Metro from 1970, [4] and the DT1 of the Nuremberg U-Bahn, also from 1970.
The 20-foot (6.1 m) stretch was achieved by adding 10-foot (3.0 m) (five-frame) extensions forward and aft of the wing. The 787-8 and 787-9 have 50% commonality: the wing, fuselage and systems of the 787-8 had required radical revision to achieve the payload-range goals of the 787-9. Following a major revamp of the original 787-8 wing, the ...
A Qantas Airbus A380-800, the aircraft type that operated these flights from 2014-2020.. Qantas Flight 7 (QF7/QFA7) [a] and Qantas Flight 8 (QF8/QFA8) [a] are flights operated by Australian airline Qantas between Sydney Airport and Dallas/Fort Worth International Airport, which, from 2013 to 2016, were the longest regularly scheduled non-stop commercial flights in the world.
Pressing a button on the key unlocks all of the car doors. Another button locks the car. In 1980, Ford Motor Company introduced an external keypad-type keyless entry system, wherein the driver entered a numeric combination —either pre-programmed at the factory or one programmed by the owner— to unlock the car without the key.
In electric power distribution, automatic circuit reclosers (ACRs) are a class of switchgear designed for use on overhead electricity distribution networks to detect and interrupt transient faults. Also known as reclosers or autoreclosers , ACRs are essentially rated circuit breakers with integrated current and voltage sensors and a protection ...