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    "headline": "Revolving door inventor Theophilus Van Kannel patented it in 1888 as a noiseless three-wing storm door",
    "description": "Theophilus Van Kannel's 1888 US patent 387,571 described the revolving door as a three-wing storm door that could not blow open or cause collisions.",
    "datePublished": "2026-11-14T11:52:00+00:00",
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    "keywords": "National Inventors Hall of Fame, Philadelphia, revolving door, Theophilus Van Kannel",
    "articleBody": "The revolving door started life with a different name. When Philadelphia inventor Theophilus Van Kannel was granted US patent 387,571 on August 7, 1888, he called his invention a “storm-door structure,” and the words “revolving door” appear nowhere in the document. What he described is the same machine millions of people push through every day: a central post, three wings radiating from it at equal angles, and a fixed casing with two curved sides that the wings brush past. He filed the application on February 10, 1888, so the patent took just under six months to issue. How a revolving door works The trick is that the door is never open. At every point in its turn, at least one wing seals against each curved side of the casing, so outside air never gets a straight path into the building. Van Kannel specified flexible strips on each wing’s outer edge, made by folding oilcloth or leather around a cord, to keep that seal tight. He listed the benefits himself. Because the wings fit snugly, he wrote, the door “is perfectly noiseless in its operation” and keeps out “wind, snow, rain, or dust.” It also cannot blow open, “as the pressure is equal on both sides of the center of motion.” Wind pushing on one wing is balanced by the same push on the wing opposite, so there is nothing to spin it. His favorite line may be this one: “there is no possibility of collision, and yet persons can pass both in and out at the same time.” A pawl at the top or bottom let the door turn in only one direction, and each wing carried a handrail and a sign showing which way to push. The clever extras in the 1888 patent Self-parking: a notched star-wheel on the post, pressed by spring-loaded rollers, nudged the wings back to a rest position so the entrance was always clear. Seasonal wings: solid or glazed wings in winter, swapped for “gauze or lattice wings during the summer.” Fold-back wings: one or more wings could be hinged and swung aside to carry long objects through or let air in on a warm spring day. Portable version: a model on casters could be rolled up to a church or theater doorway and fixed with light fastenings that would break away if a crowd rushed it from inside. That last feature anticipated a rule that arrived 55 years later. After a deadly 1942 nightclub fire in Boston, where a single revolving entrance jammed, Massachusetts in 1943 required revolving doors to be collapsible or flanked by a hinged door. American revolving doors are now built to collapse. Who really came first Van Kannel was not the first to try the idea. H. Bockhacker of Berlin received German patent DE18349 on December 22, 1881, for a “door without draft of air” that used a rotating cylinder. Van Kannel’s three-wing layout is the one that stuck. The Franklin Institute in Philadelphia gave him its John Scott Legacy Medal in 1889, the world’s first wooden revolving door went into a Times Square restaurant in 1899, and he entered the National Inventors Hall of Fame in 2007. A story that he invented the door because he disliked holding doors for women has circulated online since about 2008, but there is no evidence for it. Badiyaa’s quick math on why skyscrapers love the design: a three-wing door divides its circle into three 120-degree pockets, and since each curved side of the casing spans at least one pocket, one wing is always sealing each side. That airlock effect is what tames the stack effect, the chimney-like draft that pulls air through the base of a tall heated building. For more patents with surprising back stories, read how Garrett Morgan’s 1923 Cleveland traffic signal patent added an all-way stop and what Lewis Latimer’s 1882 light bulb filament patent actually covered. The original 1888 drawings, two sheets signed by Van Kannel and witnesses William D. Conner and Harry Smith, are still on file under patent number 387,571. Further reading Wikipedia: Revolving door Image: N509FZ, CC BY-SA 4.0 via Wikimedia Commons This article was produced with AI assistance and reviewed by our Editorial Desk. How we work.",
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