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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.
The 'Slip Gate' etc. is a refinement of the 'Slap' gate that simply used spars that were slotted into hedgerow trees or dry stone dykes without purpose made piers [6] and as these were still in use in the mid 20th century [6] it is difficult to date when 'Slip Gates' were first used, however all field enclosures required gates and therefore they could date back as far as the Iron Age, however ...
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 ...
Most architecture can be classified as a chronology of styles which change over time reflecting changing fashions, beliefs and religions, or the emergence of new ideas, technology, or materials which make new styles possible. Styles therefore emerge from the history of a society and are documented in the subject of architectural history. At any ...
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Nikkō Tōshō-gū's omote-mon (front gate) structurally is a hakkyakumon (eight-legged gate). Mon (門, gate) is a generic Japanese term for gate often used, either alone or as a suffix, in referring to the many gates used by Buddhist temples, Shinto shrines and traditional-style buildings and castles.
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Tainter gates are usually controlled from above with a chain/gearbox/electric motor assembly. A critical factor in Tainter gate design is the amount of stress transferred from the skinplate through the radial arms and to the trunnion, with calculations pertaining to the resulting friction encountered when raising or lowering the gate. Some ...