Patent ID: 7690068

Claim:
Protective structure ( 1 ) for brushes of sweeping machines ( 30 ), said sweeping machine comprising: a frame ( 31 ) and at least one cup-shaped brush ( 20 ) supported by said frame ( 31 ) and laterally protruding from said frame ( 31 ); at least one flexible membrane ( 2 ) arranged near said cup-shaped brush ( 20 ) and suitable to prevent the diffusion of dust in the environment; a supporting system ( 3 ), for said flexible membrane ( 2 ) mounted on said frame ( 31 ), laterally protruding and movably connected to said frame ( 31 ) and comprising a movable portion ( 6 ) suitable to shape said flexible membrane ( 2 ) and to laterally translate the same toward said frame ( 31 ), against the action of the elastic means ( 9 ); a free hinge ( 7 b ) for connecting said movable portion ( 6 ) to said frame ( 31 ) and suitable to allow at least partial rotation of said movable portion ( 6 ); a fixed portion ( 5 ) suitable to connect said flexible membrane ( 2 ) to said frame ( 31 ); a fixed hinge ( 7 a ) for connecting said fixed portion ( 5 ) to said frame ( 31 ) and a locking element ( 8 ) suitable to constrain the rotation allowed by said fixed hinge ( 7 a ), said fixed hinge ( 7 a ) is positioned at one end of said fixed portion ( 5 ) and wherein said locking element ( 8 ) is a handwheel acting at the opposite end of said fixed portion ( 5 ).