Abstract: An emergency exit is provided through a revolving door, having leaves angularly spaced from each other and rotatable in an enclosure in an operating condition, by automatically aligning all of these leaves parallel to a line of exit traffic through the enclosure. The revolving door leaves may be so aligned by first biasing the leaves toward each other, but maintaining the leaves angularly spaced by releasable retention against the bias exerted by such biasing, and by thereafter releasing such retention in response to an emergency condition and aligning the leaves automatically by force of the bias.