Method and apparatus of raising objects from the sea bed

Details Method and apparatus of raising objects from the sea bed Method and apparatus of raising objects from the sea bed

1995-01-11

1996-05-14

Bagnell, David J.

Hydraulic and earth engineering

Diving

Underwater docking or mooring

114 50, 114 52, B63C 710

Patent

active

055162355

ABSTRACT:
A flexible envelope, of fabric, plastic sheet or similar material, is made buoyant by being filled with water of lower salinity than the surrounding medium, and used to lift loads underwater. The lift can be generated in situ by pumping water into the envelope after it has been attached to the load through a hose form the surface, and reduced by either releasing the water from within the envelope or pumping it back to the surface again. By combining these two operations, the lift can be exactly controlled. Several envelopes can be used to lift a single load, and the load itself can be made up of small objects placed in a suitable container by other means. The envelopes may be towed into position, or may be provided with their own means of propulsion.

REFERENCES:
patent: 1373643 (1921-04-01), Ariura
patent: 3090976 (1963-05-01), Liu
patent: 3702597 (1972-11-01), Odum et al.
patent: 4078509 (1978-03-01), Buecher et al.

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