(57) The mechanical underground car parks under streets and pedestrian areas are constructed
along the street, they consist of supporting walls, floor and roof of reinforced concrete,
which form tunnels (1), (2), and (3) and they are used as an underground parking space
for parking cars by mechanical means.
In all the cases, the car enters the enclosure (10) on the street level and passes
through the rectangular opening that lies on the enclosure floor, descends inside
the tunnel (1) by the assistance of a lever system (8) or elevator.
In the first case (fig. 1 and 2), the car is positioned on the platform (7) and then
placed upon the trailer (6), which moves on the rails (5) to the first available vacant
parking space inside the tunnels (1) and (2), after that, by the assistance of a lever
system (9) or elevator, the platform with the car descends and is placed on the floor
of the tunnel, and simultaneously the trailer (6) is released. For exiting the car
park, the reversed procedure is followed. In the second case, that concerns fig.3,
the continuous movement of a unique system of trailer-platforms (6) and (7) is used.
The trailer-platforms (6) and (7) move continuously on two series of rails (5) that
are found on different levels inside the tunnel (1) (fig.3), and by the assistance
of a lever system (9) or elevator at both ends of the tunnel (1), they pass from one
level to the other. During exiting the car park, the reversed procedure is followed.
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