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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.
March 2023) ( Learn how and when to remove this message ) In hydraulic engineering , a gate is a rotating or sliding structure, supported by hinges or by a rotating horizontal or vertical axis, that can be located at an extreme of a large pipe or canal in order to control the flow of water or any fluid from one side to the other.
Electric gates alone, however solid and imposing they may be, cannot guarantee a completely secure environment electric locks, are often needed to boost the locking effectiveness of the gate motors. Electric gates are recommended to be used in combination with other security features to install a full security system.
The 2023 Kentucky Derby will be the fourth to use a custom-made 20-horse starting gate at Churchill Downs. How will horses on the inside and outside deal with their post positions?
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.
As well as these, as mentioned in the first paragraph, the troublesome gates at Redcar were replaced in 2015 with a new, exclusive telescopic sliding gate that slides across the road when a train is due. These were fitted with modern red and white reflective stripes as well as the red circle warning as seen on gates almost 100 years ago.
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