(57) A panel for building multi-panel sliding-folding doors, said panel comprising an
intermediate member (4) provided with an elongated male member (12) and an elongated
female member (14) engaging a female member (14') and a male member (12') of two adjacent
panels, respectively, characterized in that:
- said intermediate member (4) is formed by two metal sheets (6, 8) with a layer (10)
of insulating material sandwiched therebetween,
- said male member (12) is provided with a curved portion (22) and with a pawl-shaped
portion (26) having a curved outer wall (28), both portions being connected to a cylindrical
sleeve (24), both said curved portion and wall (22, 28) having the shape of arcs of
circle with their centers of curvature coincident and located on the axis of said
cylindrical sleeve (24),
- said female member (14) is provided with a curved inwardly projection (38) the shape
of which is substantially complementary to the outer surface of said sleeve (24) which
rotatably rests on said projection (38) and is retained by a blocking means (46) applied
to a flat portion (36) of said female member (14), on a tab substantially in contact
with and rubbing against said curved portion (22) of the male member (12) when this
latter (12) is rotated in respect of the former (14), said female member (14) being
provided on the side opposite to that carrying the curved projection (38) with a curved
reinforcing rib (48) in form of arc of circle whose center of curvature is located
on the axis of said leeve (24).
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