Patent ID: 7694441
Filing Date: 2010-04-13
Classification: E02F

Abstract:
1. Device for dislodging and recovering dredging material of varying nature, comprising a bearing housing, a drive shaft mounted therein for rotatingly driving with a determined torque a cutter head with a support ring, which cutter head is mountable on the drive shaft via a hub, a suction pipe which can be connected to a suction mouth which is surrounded by a fixed cutter shield which fills the space between the rotating support ring on the one side and the suction mouth and the bearing housing on the other, a number of cutter heads with a different support ring diameter, a first cutter head of said number of cutter heads having a first support ring dameter configured for a relatively hard bed material, including rock, a second cutter head of said number of cutter heads having a second support ring diameter configured for a relatively soft bed material, including sand, said number of cutter heads being alternatively mountable via the same hub on the drive shaft, a number of suction mouths with a different entry section which are alternatively connectable to the suction pipe, a first suction mouth of said number of suction mouths being configured for a relatively hard bed material, including rock, and being sized to cooperate with said first cutter head, and a second suction mouth of said number of suction mouths being configured for a relatively soft bed material, including sand, and being sized to cooperate with said second cutter head, the first suction mouth having a first entry section, and the second mouth having a second entry section, said first entry section being smaller than said second entry section, wherein the first support ring diameter is smaller than the second support ring diameter, the first support ring diameter being determined for a relatively hard bed material and the second support ring diameter being determined for a relatively soft bed material.