4 — panel of an element of furniture, which is attached to the beam;
5 — directly, the beam itself;
6 — guide attached to him.
As you can see, in this situation, the elements of interest to us have one common part — the same beam. And this is the main advantage of the scheme, since if necessary to carry out repairs (both the first element and the second) of some global work — it is not necessary to organize the dismantling.
