thus the support base 40 can be fixed adjustably in vertical direction fig4 also clearly shows that the user sees only one line on the back wall 11 as a connection line of the side walls 12 and back wall 11 fig5 is a cross sectional view of b b from top of the cooling device 1 the section is obtained from fig4 the fig5 comprises sectional view of the support rail 30 and the walls 11 12 of the inner container 10 it also presents top view of the support base 40 fig6 illustrates the detail c gathered from fig5 the figure shows details of the support rail 30 and the side wall 12 and the back wall 11 the support rail 30 comprises a single body the body may be metal or plastic based the slot line 16 is presented in the middle of the front face of the support rail 30 and lies along the support rail 30 the support rail 30 is symmetrical with respect to the plane lying along the slot line 16 in each of the symmetrical half the support rail 30 comprises a housing 33 as a channel on an inner face 32 of the support rail 30 facing an inner face 32 of the other symmetrical half the housing 33 has a cross section of l shape one leg of l is parallel to and the other leg of l is perpendicular to the wall 11 12 of the inner container 10 the perpendicular leg extends toward the wall 11 12 in another alternative the perpendicular leg may extend away from the wall 11 12 according to that the edges 110 120 of the walls 11 12 are folded inside.