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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 ...
Drawbridges listed on the U.S. National Register of Historic Places. 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.
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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.
If there is a hinged connection, it's referred to as ophaalbrug (literally "drawbridge"). This list lists both, and is incomplete as there are many such bridges in the Netherlands. Erasmusbrug, Rotterdam; Ketelbrug, Flevoland; Koninginnebrug, Rotterdam; Koningin Julianabrug (Alphen aan den Rijn) Magere Brug, Amsterdam
Drawbridge was created by the narrow-gauge South Pacific Coast Railroad on Station Island in 1876 and consisted of one small cabin for the operator of the railroad's two drawbridges crossing Mud Slough and Coyote Creek to connect Newark with Alviso and San Jose. At one time 10 passenger trains stopped there per day, five going north and five ...
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 ...
A retractile drawbridge is a rare type of moveable bridge in which the span is pulled away diagonally on rails. It is a variant of the retractable bridge. Only four examples are known to exist in the United States. [1] It is believed to have been invented by T. Willis Pratt in the 1860s.