Ships – Ballasting
Patent
1980-02-08
1982-07-06
Blix, Trygve M.
Ships
Ballasting
114 61, 114191, B63B 122
Patent
active
043377157
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a boat of the catamaran type, that is to say a boat comprising two hulls or floats united by a framework or a cockpit.
It is known that this type of boat has good stability and is endowed with a better speed compared with single-hulled boats. However, by the very fact of its design, stresses which may be very considerable in heavy weather are transmitted to the connections between the hulls or floats and the framework connecting them.
One object of the invention is to permit the production of a boat of this type arranged in such manner as to put an end to the stresses on the connections between the hulls or floats and the framework connecting them, also allowing the floats to move up and down in two planes parallel to the plane of symmetry of the vessel independently of one another and according to the shape of the liquid surface, thus obtaining better riding of the waves and a better behaviour in bad weather.
Another object of the invention is to produce a boat of this type arranged in such manner that the cockpit provided on the framework connecting the floats permanently maintains a horizontal position.
Thus, the invention relates to a boat combining at one and the same time qualities of good seaworthiness, speed and stability of the cockpit, suitable most particularly for pleasure, passenger transport and service (customs, coastguard, weather, etc . . .) boats or vessels.
It has already been proposed, as disclosed in U.S. Pat. No. 2,119,775 to connect two boat hulls through a transverse beam, whereby said hulls can pivot with respect to said beam, which can support a loading platform. However, in this case, there is provided between the two hulls, forwardly and rearwardly with respect to said beam, connecting members which are also connected to said platform, the assembly thus forming a complex system the elements of which can hardly admit the forces which are generated when such a vessel is moving on sea. The invention brings a simple and efficient solution to this problem through the use of a differential system.
The invention thus relates to a catamaran comprising two elongated floats interconnected by a beam system bearing a cockpit, wherein the beam system is connected to each float by a transverse articulation directed perpendicularly to the longitudinal axis of the float, characterized in that means constituting a differential are provided between this beam system and each float so as to maintain the axial plane of symmetry of the beam system in a mean position with respect to the floats.
According to one possible embodiment, this differential system is of hydraulic type and comprises in each case at least one jack interposed between one end of the beam and the float coupled to that end, the two jacks or sets of jacks provided at the two ends being interconnected to maintain the axial plane of symmetry of the beam system in a mean position with respect to the floats. The desired result may be obtained in particular by providing, between the beam system and the floats, double-acting jacks whose corresponding chambers are connected together.
According to another possible embodiment, the differential system is of mechanical type and between the ends of the beam system and each float there is provided one or more levers, the ends of these levers acting on the beam system being interconnected, for example by a compensating bar, so as to produce the compensation required for maintaining the axial plane of symmetry of the beam system in the aforesaid mean position.
According to another feature of the invention, the differential system provided between the beam system and the floats is under the control of a gyroscope, so that the median axial plane of the beam system may be maintained in a vertical position. In the case of a hydraulic differential system, the desired result can be obtained by connecting the chambers of the jacks to a device forming a valve and to a source of liquid and by placing this device forming a valve and (or) the source of liquid under the contro
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patent: 1558567 (1925-10-01), Schein
patent: 2047922 (1936-07-01), Seligmann
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patent: 2206100 (1940-07-01), McCormick
patent: 2325993 (1943-08-01), Zoll
patent: 2466164 (1949-04-01), Evans
patent: 2617376 (1952-11-01), Evans
patent: 2617377 (1952-11-01), Evans
patent: 3218015 (1965-11-01), Baer
Blix Trygve M.
Smith Harry A.
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