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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 ...
A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats [1] or barges. [2] 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 ...
This category includes both functioning drawbridges and ones whose draw span is no longer able to open. Pages in category "Drawbridges on the National Register of Historic Places" The following 50 pages are in this category, out of 50 total.
The bridge was built under the supervision of Mayor Carter Harrison, Jr., and Frederick W. Blocki, the Commissioner of Public Works. [7] This is the second bridge built on this site, which replaced a swing bridge with a mid-river pier supporting the swing span. The current bridge eliminated the need for the mid-river pier, allowing more room in ...
Unlike the bascule bridge, the simple drawbridge and the "oorgat" (earhole) bridge [definition needed], the double-beam drawbridge has two hinges. The road surface is connected to the bottom hinge. Above the hinge is a portal, the hamei gate. A rotating arm, the balance, is attached to this hamei gate.
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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.