(57) The method envisages: the construction of pairs of first and second bars (6 and 16)
with pairs of hooks (7 and 17) the working surfaces of which (7a and 17a) are slanted
in relation to axes (8 and 18) respectively by a first angle "β" and a second angle
"φ" which is complementary to the first; the positioning of the first and second bars
(6, 16) perpendicularly to each other, at the longitudinal sides (2a) and the transverse
sides (2b), respectively, in such a manner as to make the working surfaces (7a) of
hook pairs (7) co-planar with working surfaces (17a) of hook pairs (17), the said
hooks being fixed to the aforementioned bars; the attaching of the slats (1) to bars
(6 and 16) by press-fitting the curved edges (1a) of each slat on to the working surfaces
(7a and 17a) of hook pairs (7 and 17).
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