(57) The door comprises two panels (2) slidable in a straight line towards and away from
each other and mounted on a frame which, in turn,can move between a position of substantial
alignment with the outer surface of the vehicle and a position outside this surface.
The sliding of each panel (2) from the closed position towards the open position is
thus effected by means of a translational movement of the frame (3,4) and a sliding
movement of the actual panel (2) on the frame (3,4), performed in ordered sequence.
Each panel is held (6) substantially barycentrically both in the closed position and
in the open position. The translational movement of the frame (3,4) is controlled
by a hydraulic jack actuating device, bearing in association with it a hook member
which permits the movement of the frame towards the outer position only as a result
of the operation of the actuating device.
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