(57) The buckle according to the invention comprises, in a shell (11), a carriage (15)
slidable in a box-shaped casing (14) between a rest position and an operating position;
opposing means (16) movable with respect to the said carriage (15) and opposing the
simultaneous insertion into the casing (14) of two tongues (12) connected to corresponding
portions of the seat belt, but not opposing the insertion of one tongue (12) only;
a spring bolt (17), kept in the rest position by the said carriage (15), a catch lever
(17.4) connected to the said bolt (17) to keep a release button (18) depressed in
a corresponding aperture of the shell (11), when the bolt (17) is in the rest position,
so that the released condition of the buckle is indicated visually to the user.
The two tongues (12) inserted simultaneously into the casing (14) engage the opposing
means (16) and cause the carriage (15) to move, thus releasing the bolt (17) which
locks the tongues. This does not happen when only one tongue (12) is inserted.
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