Patent ID: 8091166

Claim:
An extendable cover for a walkway having a rotunda and a tunnel, the cover of the walkway connecting the rotunda and the tunnel, the walkway comprising at least two telescopically coupled casings including an inner casing and an outer casing, defining a section for passage between the rotunda and the tunnel, the casings being linked to one another at a lower part by a transverse pin parallel and close to a passable surface, the casings are formed by two side walls and an upper wall or ceiling and are connected to one another through two aligned linkages connecting the side walls of each side of said casings at a lower part to define the linkage pin through which the inner casing can pivot with respect to the outer casing between maximum coupling drawn in position, in which said inner casing is inside the outer casing and forms therewith a minimum angle, and a drawn out position, in which the inner casing forms a maximum angle with the outer casing greater than minimum angle, limited by retaining elements; the inner casing being connected to the tunnel through an outer edge of the walls and ceiling, the outer casing being coupled inside the rotunda to move linearly with respect to the rotunda between a maximum coupling position, in which the tunnel reaches up to said rotunda, and a maximum drawn out position limited by retaining stops arranged between said rotunda and the outer casing.