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A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
Double portcullis gates at Petersberg Citadel, Erfurt. Portcullises fortified the entrances to many medieval castles, securely closing them off during times of attack or siege. Every portcullis was mounted in vertical grooves in the walls of the castle and could be raised or lowered quickly by using chains or ropes attached to an internal winch ...
A simple suspension bridge (also rope bridge, swing bridge (in New Zealand), suspended bridge, hanging bridge and catenary bridge) is a primitive type of bridge in which the deck of the bridge lies on two parallel load-bearing cables that are anchored at either end.
Double gate or double gates is generally a pair of gates which open together. It may also refer to the following: One set of the Huldah Gates, a pair of sealed Gates of the Al Aqsa Compound. Multigate device, a type of transistor; A type of locking mechanism in some carabiners; Two gates or Twin gates gate may refer to:
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Animation showing the operation of a drawbridge. A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.In some forms of English, including American English, the word drawbridge commonly refers to all types of moveable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the ...
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 ...
A kissing gate is a gate that allows people, but not livestock, to pass through. The normal construction is a half-round, rectangular, trapezoidal or V-shaped part-enclosure with the free end of a hinged gate trapped between its arms. When the gate is touching an arm it must be pulled or pushed to pass through.