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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 ...
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.
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.
Drawbridge (British English definition) – the bridge deck is hinged on one end; Bascule bridge – a drawbridge hinged on pins with a counterweight to facilitate raising ; road or rail Rolling bascule bridge – an unhinged drawbridge lifted by the rolling of a large gear segment along a horizontal rack
A double-beam drawbridge, seesaw or folding bridge is a movable bridge . It opens by rotation about a horizontal axis parallel to the water. Historically, the double-beam drawbridge has emerged from the drawbridge. A (double-beam) drawbridge has counterweights, so that operating requires less energy compared with such a bridge without ...
The counterweighted four bar linkage type bascule bridge was designed by former Otis Elevator Company Chief Engineer Thomas Ellis Brown of New York and built in 1922 by the J. E. FitzGerald Construction Company of New London, Connecticut, according to its historical marker.
The Cortland Street Drawbridge (originally known as the Clybourn Place drawbridge) [4] over the Chicago River is the original Chicago-style fixed-trunnion bascule bridge, designed by John Ericson and Edward Wilmann. [3] When it opened in 1902, on Chicago's north side, it was the first such bridge built in the United States.