Semi-submersible crane vessel

Details Semi-submersible crane vessel Semi-submersible crane vessel

1985-03-05

1990-02-06

Basinger, Sherman D.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

114121, 114125, 114333, B63B 3903

Patent

active

048982881

ABSTRACT:
A semi-submersible crane vessel has a chamber (3) which is open to the sea at the bottom. A piston (4) is movable up and down in the chamber by means of hydraulic jacks (5 and 6) acting on piston rod (7). The part (10) of the chamber above the piston contains air, which may be pressurized via air valve (13) to balance the pressure on both sides of the piston. To stabilize the vessel during movement of a load on the crane (2), the piston is moved in the chamber. This alters the underwater volume of the vessel and therefore its buoyancy.

REFERENCES:
patent: 695108 (1902-03-01), Maxim
patent: 726705 (1903-04-01), Lake
patent: 754222 (1904-03-01), Lake
patent: 836892 (1906-11-01), Pulliam
patent: 1232667 (1917-07-01), Fernandez
patent: 3689953 (1972-09-01), Markakis
patent: 4207828 (1980-06-01), Horowitz et al.
patent: 4231313 (1980-11-01), Heerema et al.

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