UNIT FOR MINING IRON-MANGANESE CONCRETIONS Russian patent published in 1994 - IPC

FIELD: sea mining. SUBSTANCE: unit comprises casing connected by flexible hanger to hoist of service vessel, and ground-receiving chambers in said casing. Load grabs of said chambers have the form of two-arm levers capable of turning on their axles so that their upper arms can interact with drive while their lower arms, with load handled. Lever axles are installed in a common plane parallel to one another and each axle carries a number of levers whose lower arms are made like perforated plates while upper ones have spherical surface and are installed on adjacent levers of adjacent in contrary direction. Casing has an opening and is provided with stops and spring-loaded latches. Drive is constituted by perforated plate connected to flexible hanger and capable of moving in casing opening between its stops. Lower surface of plate interacts with upper arms of levers while its edges engage spring-loaded latches when in lower position relative to casing. EFFECT: improved design. 4 dwg