wing has a simpler structure as compared to known door systems and can be manufactured and serviced at favorable cost application_number US 15114998 A description turning now to the detail of the drawings fig1 shows the body of a carousel type revolving door 1 which is provided with an additional door system 2 system 2 is arranged on the body of carousel type revolving door 1 on the outer side of the building preferably system 2 serves as a night closure for closing the body of the carousel type revolving door as a whole for example as protection against unauthorized access door system 2 can be locked by means of a door lock 7 which is not described here in detail the body of carousel type revolving door 1 is shown in fig2 and includes two cylinder jacket segment shaped limiting walls 4 and 5 which oppose each other and which each release a passage 3 also included is a top cover 6 with a circular cross section limiting walls 4 and 5 are each divided into cylinder jacket segment shaped halves for facilitating the transport of the structural parts these halves are joined with each other by means of connection flanges 8 projecting on the face sides these connection flanges 8 however are not described in detail here cover 6 includes two halves which are detachably joined.