Patent ID: 8286375
Filing Date: 2012-10-16
Classification: E02F

Abstract:
1. Drag head of a trailing suction hopper dredger, comprising a rotatable visor connected to a suction pipe for discharging soil via the suction opening of the visor, wherein the visor is provided with a catching construction for preventing entrance of undesirable objects into said suction pipe, said catching construction includes a framework of rods closing off the suction opening except for passage openings between the rods, and preventing undesirable objects which are larger than the passage openings from entering the suction pipe, wherein at least a number of the passage openings have an adjustable passage area, wherein a first series of rods of said framework of rods is connected fixedly to the visor and a second series of rods of said framework of rods is connected movably to the visor, and wherein the second series of rods is connected movably to the first series of rods by means of a coupling slidable between two end stops arranged on the first series of rods.