Quick-action fastening device for a child's seat in a vehicle

A device for quick-action fastening of a child's seat on a vehicle seat having a seat substructure with a seat cushion and a backrest, comprising at least one plug-in connection having two mutually corresponding plug-in parts, with one of the plug-in parts being operatively connected with the child's seat and the other of the plug-in parts adapted to be retained in a region between the seat cushion and the backrest, on one of the seat substructure and a vehicle floor, and one of the plug-in parts being configured as a plug and the other of the plug-in parts being designed as a socket with a manually releasable locking member which locks the plug in the socket, and a tensioning device operatively connected with the plug-in connection such that when the plug has been locked in the socket, the child's seat is drawn against the seat cushion and backrest of the vehicle seat, wherein the locking member is displaceably retained in the socket, and the tensioning device has a manually operable, pivotably mounted tensioning lever arranged to transfer the locking member from and to a first position, located in a vicinity of a plug-in opening of the socket, and to and from a second position remote from said plug-in opening.