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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 ...
A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.
In American English, the term is synonymous with drawbridge, and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers to only a specific type of moveable bridge often found in castles.
The HX Draw is a bascule bridge carrying the New Jersey Transit Bergen County Line and Pascack Valley Line across the Hackensack River between Secaucus, New Jersey and East Rutherford.
The Sparkill Creek Drawbridge is a historic Pratt Pony Truss drawbridge located at Piermont in Rockland County, New York. It was built in 1880 by the King Iron Bridge Company of Cleveland, Ohio, and is a single-leaf movable metal bridge. Chains can lift the bridge when an operator turns a crank, helped by counterweights.
Traditional use of the term "rolling bridge" dates from at least the Victorian era, and is used to describe a type of retractable drawbridge used to span a ditch or moat surrounding a fortification. That type of bridge is not hinged, and remains horizontal when it is rolled inside the gates of a fort.
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In American English, the term drawbridge refers to any type of movable/moveable bridge. This category includes both functioning drawbridges and ones whose draw span is no longer able to open. This category includes both functioning drawbridges and ones whose draw span is no longer able to open.