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  2. Electric gate - Wikipedia

    en.wikipedia.org/wiki/Electric_gate

    A sliding electric gate with electric motor and backup battery in case of mains failure. Note also the Infrared obstacle sensor located on the wall to prevent the gate from closing while a vehicle or other obstacle is in the way.

  3. Portcullis - Wikipedia

    en.wikipedia.org/wiki/Portcullis

    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.

  4. Automatic door - Wikipedia

    en.wikipedia.org/wiki/Automatic_door

    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.

  5. Caisson (lock gate) - Wikipedia

    en.wikipedia.org/wiki/Caisson_(lock_gate)

    Hinged gates are relatively complicated, and so expensive, to construct. Large gates require powered machinery to operate them, machinery that must be provided for each set of gates. Chevron gates can also only resist deep water on one side of the gate, which may be a drawback in some tidal areas where a high tide outside can exceed the depth ...

  6. Gate - Wikipedia

    en.wikipedia.org/wiki/Gate

    Gate from Bucharest (Romania) Art Nouveau gate of Castel Béranger (Paris) Candi bentar, a typical Indonesian gate that is often found on the islands of Java and Bali. A gate or gateway is a point of entry to or from a space enclosed by walls. The word derived from old Norse "gat" [1] meaning road or path; But other terms include yett and port.

  7. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    The tenons of the gates at Balawat were sheathed with bronze (now in the British Museum). These doors or gates were hung in two leaves, each about 2.54 m (100 in) wide and 8.2 m (27 ft) high; they were encased with bronze bands or strips, 25.4 cm (10.0 in) high, covered with repoussé decoration of figures. The wood doors would seem to have ...