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A portcullis (from Old French porte coleice ' sliding gate ') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.
Driveway gate openers can be the rollback (sliding) type that retracks a gate along the fence or wall on wheels or bearing, or the swing type that draws the gate open or closed on hinges. They are usually operated by a remote controller or a sensor
A wicket gate is also used for a stand-alone gate that provides convenient secondary access, for example to the rear of a walled park or garden. The cricket term "wicket" comes from this usage. [7] "The Wicket Gate" is an important feature in John Bunyan's 17th-century Christian allegory The Pilgrim's Progress. As the first stage of the journey ...
An ornate 19th-century porte-cochère, at Waddesdon Manor A modern example at a hospital. A porte-cochère (/ ˌ p ɔːr t k oʊ ˈ ʃ ɛ r /; French: [pɔʁt.kɔ.ʃɛʁ]; lit. ' coach gateway '; [1] pl. porte-cochères – pl. portes-cochères) [2] is a doorway to a building or courtyard, "often very grand," through which vehicles can enter from the street [3] or a covered porch-like ...
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.
Locking is provided by a key lock in the centre of the door moving two square sliding lock bars in and out of holes in the door tracks, locking and unlocking it, or by the solenoid lock in the automatic motor. Newer homes feature more American styled tilting panel lift doors which slide up onto a track on the ceiling via a motor and chain drive.
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