Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having hydrofoil
Patent
1996-04-22
1997-07-15
Sotelo, Jesus D.
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having hydrofoil
114219, B63B 124
Patent
active
056472960
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a shock damper for a boat, which is mounted below and in front of the bow of a boat and serves as a device for damping the shocks or impacts generated by waves.
This type of shock damper is prior known from the patent publication U.S. Pat. No. 3,641,963. This prior known shock damper is only flexible in the longitudinal direction of a boat and, thus, the line of action does not comply with various forms of waves. The shock damper does not ride on top of the waves but sends the splash water flying on the sides and forward in the air with water falling into the boat.
An object of the invention is to provide a shock damper for a boat, which does not impair the handling characteristics of a boat yet serves effectively as a shock damper by lifting the bow up before the bow hits the water, thus reducing the side splashes produced by waves hitting the sides of the bow.
A second object of the invention is to provide an improved shock damper, which eliminates the forward flying of splash water and rises or tends to rise on top of the wave by adapting itself to the surface of waves having varying shapes.
A particular additional object of the invention is to provide a shock damper, which serves as a shock damper over an extensive area both within the bow and forward part of the bottom, i.e. within the area which is not in contact with water in normal driving. The shock damper must be flexible in a manner that protects a boat from vibration in view of providing a pleasant ride.
These objects are achieved on the basis of the characterizing features set forth in the appended claims. The scope of protection is defined by the allowed claims.
One exemplary embodiment of the invention will now be described in more detail with reference made to the accompanying drawings, in which
FIG. 1 shows a side view of the fore part of a boat provided with a shock damper of the invention;
FIG. 2 shows a section along a line II--II in FIG. 1, and
FIG. 3 shows alternative cross-sectional shapes for a shock damper as a section along a line III--III in FIG. 1.
To the bottom of a boat, below the bow section is fastened by means of bolts 5 a leaf spring 1, which is made of a fiber-reinforced plastic, a so-called composite material. Fitted between the spring 1 and the bottom of a boat are vibration absorbing rubber pads 3 as well as mounting strips 4 which are fastened to the bottom of a boat by means of bolts or screws 6. The mounting strips 4 facilitate the attachment of a shock damper to bottoms of various shapes. The spring 1 has its leading end curving upwards but gently enough to diverge from the bow rib of a boat. The leading end of the spring 1 is provided with a pivot hinge 7 for mounting an impact plate or ski 2 whose material and shape can be the same as those of the curved leading section of the spring 1. The cross-sectional shape of the leading end of the spring 1 and that of the ski 2 is a shallow trough whose edges 1a are directed downwards or obliquely downwards. FIG. 3 illustrates a few examples of possible cross-sectional shapes. The spring 1 and the ski 2 may have a width which is within the range of 100-250 mm, typically within the range of 150-200 mm. The edges 1a may have a height which is e.g. 30 mm. The dimensions are correspondingly larger in larger boats. At the mounting points 4 said spring 1 may be in a flat shape without downwards extending edges 1a.
The spring 1 and the ski 2 are located along the centre line of a boat in the longitudinal direction thereof.
The ski 2 is freely pivotable and the hinge point 7 is located slightly above the median line whereby, during the driving, the air pressure and/or waves keep the ski 2 in an inclined impact position, wherein its tail end rests against a rubber pad 9 secured to the bottom surface of the spring 1. Between the leading end of the spring 1 and the bow of a boat is fitted a spring 8, which supports the leading end of the spring 1 and together with the spring 1 provides a shock receiving spring force. At rest, the ski 2 is capable of p
REFERENCES:
patent: 2776637 (1957-01-01), Chadwick
patent: 3636907 (1972-01-01), Scarritt, Sr.
patent: 3641963 (1972-02-01), Chancellor, Jr.
patent: 3670684 (1972-06-01), Helker
patent: 3703877 (1972-11-01), Ueda
O'Neil Michael A.
Rippamonti Russell N.
Sotelo Jesus D.
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