The locking bars (6) are mounted slidably in C-shaped receiving grooves (3) of the leaf (1). The locking bars (6) are of U-shaped cross-section and have lateral legs (7) which are each equipped with a side groove (8) extending over the entire bar length. Each side groove is limited by a lower web of the thickness S1 and an upper web of the thickness S2. The clear height of each side groove has the dimension N. The clear height H1 of the receiving groove (2) is greater than the constructional height H2 of the locking bar (6) by the amount of the web thickness S1. The receiving grooves and the associated locking bars (6) are of identical cross-section on all the spars of the leaf. The receiving grooves (3) have inwardly extending edge strips (5), the constructional height H3 of which is a little smaller than the clear groove height N of the side grooves. There are two installation positions I or II for the locking bars. In the installation position I, the side legs of the locking bar are supported on the bottom face (4) of the receiving groove (3), whilst in the installation position II the locking bar (6) is mounted slidably on the edge strips (5) of the receiving groove (Figure 1). IMAGE
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