(57) Counterframe, for an interior door, including two parallel jambs consisting of a
first and a second metal profile, connected at the upper end by an orthogonal connecting
element and a counterframe for disappearing sliding door including a case intended
to receive the plaster or plasterboard coating, an upper crosspiece containing a sliding
track, a rabbeted jamb profile that houses the doorpost, in which at least one metal
jamb profile has a deep, continuous and rectilinear U-shaped seat turned towards the
interior of the counterframe, in which at least one tubular duct held inside said
U-shaped seat by clips and with, along the base of the U-shaped seat, some removable
sheet metal portions, is longitudinally housed. In one version of the counterframe,
the orthogonal connecting element consists of a support box with or without box of
the internal split, which is obtained from the coupling of two sheet metal panels
which at the two ends are closed by bottom plates which are connected to the fixing
upper ends of the first and second jamb profiles.
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