side of sliding cover 4 said shield consisting of an upper shield part 24 and a lower shield part 25 the two shield parts 24 and 25 overlap the upper shield part 24 is bent back along its upper edge forming an outwardly directed flange this bent back part 26 is inserted in a space between headlining 6 and sliding cover 4 and is retained therein by virtue of the fact that it comprises openings 27 which accept projections 28 on headlining panel 6 instead of projections 28 springs can also be provided on headlining panel 6 said springs engaging openings 27 alternatively of course openings 27 can be provided in headlining panel 6 and projections 28 can be provided on part 26 the lower shield part 25 in the first embodiment shown is provided with one forward and one rear sliding shoe 29 and 30 respectively said shoes being pushed onto the free ends of cover 8 lateral displacement of the lower shield part is prevented by virtue of the fact that this part is provided with a tab 31 near its forward end and a tab 32 near its rear end said tabs fitting around the lower edge of the upper shield part 24 as shown in.