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A geared continuous hinge is a type of continuous hinge used mostly on doors in high-traffic entrances and features gear teeth that mesh together under a cap that runs the length of the hinge. The hinges use a number of fasteners to attach the door to the frame from top to bottom to distribute a door’s weight more evenly along the frame to ...
Manual gates are sometimes hung in the manner of a normal gate (i.e. hinged horizontally). In some places, bar gates are installed across suburban streets as a traffic calming measure, preventing through traffic, while allowing authorised vehicles such as emergency services and buses to take advantage of the shorter and more direct route.
Faster aircraft have retractable undercarriages, which fold away during flight to reduce drag. Lagrangian mechanics – Introduced by the Italian-French mathematician and astronomer Joseph-Louis Lagrange in 1788, Lagrangian mechanics is a formulation of classical mechanics and is founded on the stationary action principle .
Hiraki shoji are mounted on hinges in a doorframe, and open like a standard western door. Some are single doors, some double doors. [89] Double doors, whether bifold doors or not, are termed ryōbiraki shoji (両開障子). [90] Tsukuritsuke shoji (造付障子, "fixed shoji"), are often horizontal strips. [6]
A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a ...
However, these gates are less effective than full platform screen doors in preventing people from intentionally jumping onto the tracks. [14] These gates were first [clarify] in practical use by the Hong Kong MTR on the Disneyland Resort line for the open-air station designs. Most half-height platform edge door designs have taller designs than ...
The landing gear represents 2.5 to 5% of the maximum takeoff weight (MTOW) and 1.5 to 1.75% of the aircraft cost, but 20% of the airframe direct maintenance cost. A suitably-designed wheel can support 30 t (66,000 lb), tolerate a ground speed of 300 km/h and roll a distance of 500,000 km (310,000 mi) ; it has a 20,000 hours time between overhaul and a 60,000 hours or 20 year life time.
1939 Starting gate A starting gate, also known as starting stalls, is a machine used in the sports of thoroughbred horse and dog racing to ensure a fair start in a race. The starting gate was invented by Clay Puett of Chillicothe, Texas, when it was used at Lansdowne Park in Vancouver, British Columbia, Canada for the first time on July 1, 1939 ...