Device for coupling a barge unit to a pusher-tug for sea transpo

Details Device for coupling a barge unit to a pusher-tug for sea transpo Device for coupling a barge unit to a pusher-tug for sea transpo

1975-10-16

1977-05-31

Blix, Trygve M.

Ships

Towing or pushing

Nested vessels

B63B 2100

Patent

active

040262340

ABSTRACT:
A device for coupling a barge unit to a pusher-tug for sea transport, comprising guiding rollers mounted on the barge on a line perpendicular to the plane of symmetry of the pusher-tug. Two coupling cables pass on the rollers and the cables are connected at one end to shock absorbers at the stern portion of the tug and at opposite ends to hydraulic power devices at the bow portion of the tug. The cable has an inclination angle .alpha..sub.1 with respect to the symmetry plane of the tug at the connection with the shock absorber and an inclination angle .alpha..sub.2 at the connection with the hydraulic power devices. The angles are selected such that for a preload in the cable equal to force P developed by the hydraulic power devices, the difference between P cos.alpha..sub.1 and P cos.alpha..sub.2 is at least equal to one-half of the force tending to separate the tug and the barge. Each shock absorber has a stroke equal to the difference in the length of the cable at extreme positions of the tug as determined by the pitching and heaving amplitude of the tug.

REFERENCES:
patent: 2722907 (1955-11-01), Dyer
patent: 3483842 (1969-12-01), Ohcho et al.
patent: 3486476 (1969-12-01), Breit
patent: 3645225 (1972-02-01), Lunde

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