10 over the second connecting elements 18 referring again to fig4 the second gap 24 left between the landing sill 14 and the car sill 7 at the point of the opening 22 is greater than the first gap 20 as shown in fig3 8 the car sill 7 comprises a closing element 25 which contains a covering surface 26 essentially the size of the opening 22 the closing element 25 can be moved by means of the turning mechanism 28 between the opened position i presented in fig3 5 and 7 and the closed position presented in fig4 6 and 8 in the opened position i the closing element 25 is away from the point of the opening 22 in the closed position ii the closing element 25 is at the point of the opening referring to fig4 in the closed position ii the closing element forms a filling of the opening 22 such that the third gap 27 between the closing element 25 and the second front edge 16 of the landing sill 14 is essentially as large as the first gap 20 i e at most 15 mm preferably 1 10 mm as shown in fig7 and 8 the closing element 25 is hinged to the car sill 7 below the level of its top surface 30 to rotate in the perpendicular plane of the car sill 7 i e perpendicular to the plane of the figure around the horizontal shaft 31 such that in the closed position ii of fig8 the covering surface 26 of the closing element 25 is on the level of the top surface 30 of the car.