Ships – Displacement-type hull – Multiple hulls
Patent
1984-05-07
1986-04-15
Basinger, Sherman D.
Ships
Displacement-type hull
Multiple hulls
114165, 114345, 403400, B63B 110, B63B 708
Patent
active
045820120
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to demountable joints between elongated structural elements which are to be secured to each other at an angle, typically 90.degree.. The invention also relates to inflatable hull structures for boats. Two or more such hull structures may be detachably secured to cross beams by the demountable joints to form a multi-hull boat such as a catamaran.
The present invention also relates to rudders and is particularly suitable in respect of sailing boats such as dinghies and catamarans.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention which is defined in the claims, will now be further described by way of example with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a catamaran embodying the invention;
FIG. 2 show a a bow of the catamaran partly in elevation and partly in longitudinal section, on an enlarged scale;
FIG. 3 is a vertical cross-section on the line III--III of FIG. 2;
FIG. 4 is a cross-section on the line IV--IV of FIG. 2 on a further enlarged scale;
FIG. 5 is a cross-section on the line V--V of FIG. 1;
FIGS. 6 and 7 are plan and side elevationsl views of the aft end of one of the inflatable hulls;
FIG. 8 is an elevational view of a portion of the side of the framework of the catamaran showing the connection of a cross beam to a hull beam;
FIG. 9 is a plan view of the connection shown in FIG. 8;
FIG. 10 shows a vertical cross section on the line X--X of FIG. 9;
FIG. 11 shows in cross section the portion within the circle XI of FIG. 9 on an enlarged scale;
FIGS. 12 and 13 show the first and second brackets in flattened form, prior to bending;
FIG. 14 is a side elevational view of the stern of one hull showing the components of the rudder;
FIG. 15 is a plan view of the rudder shown in FIG. 14;
FIG. 16 is a view on an enlarged scale of the connection between the connecting rod and tiller shown in FIG. 14 in the direction of the arrow XVI, and
FIG. 17 is a plan view of the stern of the catamaran showing the linkage between the two tillers.
DETAILED DESCRIPTION
The demountable catamaran shown in the drawings comprises a pair of hull structures 1 interconnected by detachable cross-beams 2 and 3. Each hull structure 1 comprises an inflatable hull 4 in the form of a tube of cross-section which varies along its length to give the required form to the hull, a hull beam 5 extending along the top of the hull, a bow member 6 interconnecting the tapered down bow of the hull tube 4 with the hull beam 5, and a stern post 7 carrying a rudder assembly 8, the rudder assemblies being linked by a tiller link tube 9.
As is shown clearly in FIGS. 3 and 5, each hull beam 5 is of generally rectangular tubular construction, being formed from a length of aluminium alloy extrusion, suitable alloys being those used for yacht masts such as international designation 6082 in condition TF. The bottom wall of the hull beam 5, however, consists of two support surfaces or flanks 11 which slope upwards at about 30.degree. to the horizontal from near the bottom edges of side walls 12 of the hull beams to an entry portion 13 leading into a channel 14 which is conveniently shaped as the major portion of the circle. Where the entry portion 13 meets the channel 14, the width of the entry portion is further reduced by a nose formation on each side of the entry to the channel 14 thereby further reducing the width of the resulting throat and providing an increased thickness of metal at the bottom two edges of the channel 14. The hull beam extrusion is completed by a top wall 15 which is joined to the top edges of the side walls 12 by arcuate portions 16. The extrusion may for example have a wall thickness of 2 mm, a height of 85 mm and width of 80 mm.
Each hull tube 4 is constructed of suitable flexible air tight and water tight material, such as woven nylon cloth coated with polyurethane. Along its top edge, each hull beam has an upstanding rib consisting of a web portion W and a bead B. The height of the web portion W and diameter of the bead portion B
REFERENCES:
patent: 2646285 (1953-07-01), Snyder
patent: 3812805 (1974-05-01), Forssell et al.
patent: 4218986 (1980-08-01), Hackney
patent: 4284024 (1981-08-01), Montgomery
patent: 4348971 (1982-09-01), Montgomery
Basinger Sherman D.
Gulf Investments International S.A.
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