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Articulated gate openers can be used for gates with wide posts allowing opening in small spaces. [1] An easy system for DIY installers as they are simple to install but not as aesthetically pleasing as other motor designs.
Portcullis at Desmond Castle, Adare, County Limerick, Ireland The inner portcullis of the Torre dell'Elefante in Cagliari, Sardinia, Italy A portcullis (from Old French porte coleice ' sliding gate ') is a heavy, vertically closing gate typically found in medieval fortifications. [1]
A sluice gate. A sluice (/ s l u s / SLOOS) is a water channel containing a sluice gate, a type of lock to manage the water flow and water level. It can also be an open channel which processes material, such as a river sluice used in gold prospecting or fossicking.
Some sliding doors run on a wall-mounted rail, like this one Sliding doors in a modern wardrobe. The 'top-hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move.
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.
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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 ...
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