Abstract: A quick coupling device, particularly for connecting a seat assembly to a toilet bowl, comprising a post which can be fixed to a toilet bowl. On the post there is provided an open socket for inserting therein, and extracting therefrom, at least one pivot for the connection of a seat assembly. The socket forms an engagement portion which can be detachably engaged by a mating portion of the connection pivot for the removable retention of the connection pivot in the socket.