| 摘要 |
A leaf (8) can move between an open position and a closed position relative to an opening (3, 4, 6, 7). In the closed position, a front edge (12) of the leaf is engaged in a groove (11) of the front edge (3) of the opening. At the beginning of the opening procedure, a thrustor (24) pivots two arms (18a, 18b), the ends of which slide in grooves (21a and 21b) of the leaf, toward the outside of the opening. This disengages the rear edge of the leaf relative to the rear edge (4) of the opening. Then, a thrustor displaces a carriage (39) along a slideway (38), while, by way of a roller (47) following a track (51), an arm (41) articulated to the carriage (39) and to the leaf (8) disengages the front edge (12) in a controlled manner relative to the plane of the opening. The arm (41) drives the leaf (8 ) toward the rear, while the leaf (8) pivots slightly and slides relative to the axis (19a) defined by the ends of the two rear arms (18a and 18b). The lower rear arm (18b) sustains in compression the reaction force of the pivoting of the leaf about the axis of the cylindrical slideway (38). The reaction force to the tilting of the leaf (8) about an axis perpendicular to the plane of the opening is provided by the slideway (38) via the joints of the arm (41).
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