Patent ID: 7021002

Claim:
A revolving door comprising: an at least partly cylindrical shell wall, said cylindrical shell wall comprising an entrance and an exit; and two rotating door leaves which are placed inside said shell wall and that together span essentially a breadth of said partly cylindrical shell wall; wherein between said shell wall and an end of at least one of said door leaves, said end moveable near and along said shell wall, a sliding door is provided that is suitable for closing off said entrance or exit; wherein said sliding door can move in only one rotational direction; and wherein during rotation of said door leaves in a start-up phase, as said sliding door begins to close off said entrance or said exit, said sliding door moves more slowly than said end of said at least one door leaf which is between a first lateral edge and a second lateral edge of said sliding door, and wherein during a closing phase that succeeds said start-up phase, and in which said sliding door completely closes off said entrance or exit, said sliding door moves faster than said end of said at least one door leaf to complete said closing phase, until said end of said at least one door leaf and said second lateral edge of said sliding door are close together and said at least one door leaf and said sliding door synchronously move on, or stand still until, said start-up phase starts anew.