Ships – Spars – Masts and masting
Patent
1993-02-08
1995-02-28
Swinehart, Ed
Ships
Spars
Masts and masting
114124, B63B 1502
Patent
active
053927273
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a balancing system for a sailing boat comprising a mast tiltable laterally about the mast foot.
2. Description of the Related Art
Numerous sailing boat designs have been suggested with the above mentioned features, comprising a transversally pivotably mounted mast thereby utilizing forces transmitted from the wind forces on the sail causing the transversal mast movement in relation to the hull to angularly rotate the keel or displacing weights transversally in the hull, with the purpose such as to prevent capsizing or maintaining the hull in a substantially stable position. Sailing boats of the aforementioned art are known from e.g. U.S. Pat. Nos. 559,983, 830,720, 3,099,976 and U.S. Pat. No. 3,985,106.
From SE 456 237 is furthermore known a sailing boat in which wires attached to the mast act on hydraulic cylinders from which a hydraulic fluid of a hydraulic system is transferred to hydraulic devices adapted to transversally displace balancing weights inside the hull, preferably near the hull bottom. The hydraulic system may be set to a desired transmission ratio between the mast wire movement and the weight wire movement, e.g. a certain heeling angle of the mast is causing a desired lateral displacement of the balancing weight.
Prior art sailing boat balancing systems, however, are complex, partly comprising a large number of space consuming means, requiring hydraulic systems for the transmission of the mast movement to the weight devices and also for effecting the transversal displacement of the balancing weights.
SUMMARY OF THE INVENTION
The present invention is related to a balancing system designated to maintain the hull of a sailing boat in a desired steady position, such as horizontally, essentially independently of wind forces exerted on the sail, thereby utilizing a transversal tilting of the mast in relation to the hull of the sailboat to transversally displace a weight inside the hull by means of wires connected to the mast and the weight via at least one transmission device.
For this purpose arrangements are made for displacement of a balancing weight in the transverse direction by means of direct actuation on the weight by wires connected with the mast, in dependence of the heeling angle of the mast, in addition to which, the ratio between the lateral displacement of the balancing weight and the heeling angle of the mast may be set to a desired value. Furthermore it is required to maintain the interior of the hull free of equipment connected to the balancing system, thereby to be utilized by the sailing boat user.
With the balancing system according to the present invention the above mentioned advantages are achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawing FIG. 1 discloses a vertical longitudinal center section of a sailing boat comprising one embodiment of the balancing system of the present invention, FIG. 2 discloses a cross section along II--II in FIG. 1, FIG. 3 discloses a ground view of the embodiment disclosed in FIGS. 1 and 2 of the inventive balancing system, FIG. 4 discloses cross section corresponding to FIG. 2 of a second embodiment of the present invention, FIG. 5 discloses a partial ground view corresponding to FIG. 3 of the second embodiment of the present invention, FIG. 6 discloses a partial longitudinal section corresponding to FIG. 1 of the second embodiment, FIG. 7 discloses a halc cross section corresponding to FIG. 2 of a third embodiment of the present invention, FIG. 8 discloses a partial longitudinal section corresponding to FIG. 1 of the third embodiment and FIG. 9 discloses a ground partial view corresponding to FIG. 3, of the third embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The mast 1 of the sailing boat is supported in a mast bearing 15 substantially at the deck level, allowing lateral tilting movements of the mast. Wires 2 and 3 are connected to an upper portion of the mast, preferably to a transverse stay on the mast. T
REFERENCES:
patent: 559983 (1896-05-01), McLean
patent: 3903827 (1975-09-01), Marcil
patent: 3985106 (1976-10-01), Ross
patent: 4094263 (1978-06-01), Marcil
Christensen Jan A.
Ohrn Carl O.
Sailmatic AS
Swinehart Ed
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