HYDRAULIC DRIVE FOR HATCH COVERS Russian patent published in 2009 - IPC B63B19/14 B63B19/197 

FIELD: ship building.

SUBSTANCE: invention relates to ship building, particularly to hydraulic drive of hatch covers. Proposed hydraulic drive comprises at least two hinged-together sections, actuating double-acting hydraulic cylinders, three-position hydraulic control valves and pump station. The latter communicates, via the first three-position hydraulic control valve, pressure and drain lines, with rod and head ends of actuating hydraulic cylinders. Each of the latter is pivoted to the base and drive section hinged to the base to turn in vertical plane. Driven section end part has rolls for them to roll over the hatch coaming guides. Pressure lines communicates with actuating hydraulic cylinder head ends via the second three-position hydraulic control valve or via two-way hydraulic lock and flow rate regulator with return valve, or via two-way hydraulic lock. Hydraulic drive comprises hydraulic cylinder of hitch cover with its housing attached to the drive section, while its rod interacts with the driven section. Head and rod ends of hydraulic cylinder communicate, via appropriate hydraulic lines, head and rod ends of actuating hydraulic cylinders. Head end of hatch cover hydraulic cylinder can communicate with rod ends of actuating cylinders via additional yawing throttle with adjustable check valve.

EFFECT: higher reliability and improved performances.

7 cl, 7 dwg