Boarding installation, especially for vehicles transporting passengers between an air terminal and an aircraft

Boarding installation for vehicles transporting passengers between the platform of an air terminal and an aircraft, which installation is composed of telescopic plates and bellows elements forming a tunnel which is extended between the exit of the vehicle and the aircraft or the air terminal platform comprising a support carrying a pivoting plate and a counter-plate, the pivoting plate having the shape of half a circular disc with a rear edge in the form of an arc of a circle, the pivoting plate having a pivoting axis around the center of said circle, the counter-plate being fixed on the support, having an edge in the form of an arc of a circle of the same radius as the poviting plate and this edge of the counter plate coming in edge to edge contact against the rear edge of the plate, the pivoting support having a triangular shape with a vertex thereof reaching the pivoting axis of the plate, a supplementary sector pivoting telescopically in relation to and beneath the pivoting plate through a small angle on one half of the forward edge of the pivoting plate, means for controlling the telescopic movement of the assembly between a retracted position and an extended position, means for controlling the pivoting of the pivoting plate, and means controlling the pivoting of the sector.