Patent ID: 8099827

Claim:
A device ( 1 ) for suction of waste and contaminating substances from the ground, of type used in road sweepers and similar, comprising a suction pipe ( 2 ) and a recirculation pipe ( 3 ), said device ( 1 ) further comprising: an inlet aperture ( 2 a ) of said suction pipe ( 2 ) and an outlet aperture ( 3 a ) of said recirculation pipe ( 3 ), said outlet aperture ( 3 a ) consisting substantially of as lot which substantially surrounds said inlet aperture ( 2 a ) near the ground and comprising a front part and a rear part designed to create opposing air flows, a wing element ( 7 ) bordering said outlet aperture ( 3 a ) suitable to drive said air flows from said outlet aperture ( 3 a ) to said inlet aperture ( 2 a ) so as to create a depression near the ground, said front part and having a greater distance from the ground than said rear part having distances from the ground that differ each other of; and wherein the difference between the distance from said ground of the front part, and the distance of the rear part from the ground is between 4 cm and 12 cm.