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Patent Searching and Data


Title:
ACCESSORY RAIL FOR BOATS
Document Type and Number:
WIPO Patent Application WO/1991/008138
Kind Code:
A1
Abstract:
An accessory rail (10) adapted to be attached to an existing spray rail (7) of a boat bottom (4) is disclosed. The accessory rail (10) includes a mounting portion (11) having a first supporting surface (12) adapted to abut a substantially vertical surface (9) of the existing spray rail (7), and a rail portion (13) extending downwards from the mounting portion (11) and including a water deflecting surface (14). The rail portion (13) may include a second supporting surface (15) adapted to abut a substantially horizontal surface (8) of the existing spray rail (7). The water deflecting surface (14) may be a flat or a curved surface.

Inventors:
Mannerfelt, Göran
Application Number:
PCT/SE1990/000774
Publication Date:
June 13, 1991
Filing Date:
November 23, 1990
Export Citation:
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Assignee:
Mannerfelt, Göran
International Classes:
B63B1/04; (IPC1-7): B63B1/18
Foreign References:
US4159691A
US3361104A
US3137261A
Download PDF:
Claims:
CLAIMS
1. A rail (10) adapted to be attached to an existing spray rail (7) of a boat bottom (4), including a mounting portion (11) having a first supporting surface (12) adapted to abut a substantially vertical surface (9) of the existing spray rail (7), and a rail portion (13) extending downwards from the mounting portion (11) and including a water deflecting surface (14) .
2. A rail according to claim 1, wherein the first supporting surface (12) and the water deflecting surface (14g) are aligned.
3. A rail according to claim 1, wherein the rail portion (13) includes a second supporting surface (15) adapted to abut a substantially horizontal surface (8) of the existing spray rail (7) .
4. A rail according to claim 3, wherein the water deflecting surface (14a) is a flat surface defining an angle with the second supporting surface (15).
5. A rail according to claim 3, wherein the water deflecting surface is a curved surface (14bf) .
6. A rail according to any one of the preceding claims, wherein the mounting portion (11) is provided with through holes for mounting screws (16).
Description:
ACCESSORY RAIL FOR BOATS

The present, invention concerns an accessory rail for boats, i.e. , a rail adapted to be mounted on existing longitudinally 5 extending raisers o spray rails at the bottom of a boat in order to improve the performance of the boat.

U.S. Patent 3,361,104 discloses one kind of accessory rail adapted to be attached to a smooth boat bottom in order to 10 improve the stability of the boat and to cushion the boat against slamming down on the water when cruising in rough sea.

Contrary to the patent mentioned the object of the present invention is to improve the performance of a boat already 15 provided with conventional spray rails.

A particular object of the present invention is to provide an accessory rail suitable for attachment to existing spray rails of the kind including a substantially horizontal surface and a 20 substantially vertical surface, both extending in the longitudinal direction of a boat bottom.

According to the present invention, an accessory rail adapted to be attached to an existing spray rail includes a mounting 25 portion having a first supporting surface adapted to abut a substantially vertical surface of the existing spray rail, and a rail portion extending downwards from the mounting portion and including a water deflecting surface.

30 In certain embodiments of the present invention the rail portion includes a second supporting surface adapted to abut a substantially horizontal surface of the existing spray rail.

The mounting portion may be provided with means for its 35 attachment to an existing spray rail such as through holes for screws .

The invention will now described more in detail reference being made to the accompanying drawings, wherein:

Fig. 1 is a schematic section through a boat hull the bottom of which is equipped with conventional spray rails, the spray rails on the starboard half of the bottom being provided with accessory rails according to the present invention; Fig. 2 is a section through a portion of the boat bottom of Fig. 1 showing at an enlarged scale a conventional spray rail and a rail according to the present invention mounted thereto; and Figs. 3a-g are sections through various embodiments of the accessory rail according to the present invention.

The hull shown in Fig. 1 is a conventional V-bottom hull 1 having a port side 2, a starboard side 3 and a bottom 4 including a port bottom half 5 and a starboard bottom half 6. Both bottom halves are shown being provided with three mutually parallel spray rails 7 extending in the longitudinal direction of the hull .

As is shown more clearly in Fig. 2 each spray rail 7 comprises a substantially horizontal surface 8 and a substantially vertical surface 9. Spray rails of this conventional kind serve as a means to bring a boat faster to a planing position and to stabilize the boat at planing speeds, the substantially horizontal surface lifting the boat and the substantially vertical surface preventing unintended lateral movement. The substantially horizontal surface directs the water flowing along the bottom in a mainly horizontal lateral direction away from the hull, as shown with a dashed arrow H in Fig. 2.

In order to provide more lifting force the present invention aims at directing such laterally flowing water in a downward direction and provides an accessory rail 10 having a mounting portion 11 including a supporting surface 12, and a rail portion 13 including a water deflecting surface 14 and a supporting surface 15. The supporting surfaces 12 and 15 are adapted to closely abut the substantially vertical surface 9 and the substantially horizontal surface 8, respectively, of the spray rail 7. By means of a plurality of longitudinally distributed screws, one screw 16 being shown in Fig. 2, extending through the mounting portion 11 and the substantially vertical surface 9 of the spray rail 7 into the bottom of the boat, the rail 10 is firmly attached to the existing spray rail 7. In this position, the water deflecting surface 14 merging with the supporting surface 12 in a relatively sharp tip 17, constitutes a concavely curved continuation of the substantially horizontal surface 8 of the spray rail 7 deflecting water flowing laterally along surface 8 in a downward vertical direction as shown by arrow V in Fig. 2. The degree of downward direction is, of course, dependent of the shape of the water deflecting surface 14, and, particularly, on the direction of the tangent thereto at the downwardly directed apex 18 of the rail portion 13.

Various shapes of the water deflecting surface 14 are shown in Figs. 3a-g .

In the embodiment, of Fig. 3a the water deflecting surface 14a is a plane surface defining an angle with the supporting surface 15 and deflecting the water approximately 40° downwards from its original flowing direction.

In Fig. 3b the water deflecting surface 14b is a concave curved surface having a relatively great radius and deflecting the water an angle of approximately 60°.

In the embodiment of Fig. 3c the water deflecting surface 14c is a conave curved surface having a relatively small radius and deflecting the water approximately 90°.

In the rail of Fig. 3d the water deflecting surface 14d has a relatively wide supporting surface 15 and an approximately part-elliptical concavely curved section deflecting the water approximately 50°.

Also in the embodiment of Fig. 3e the water deflecting surface

14e is approximately part-elliptical but terminates at a shorter distance from the substantially horizontal surface 8 of the spray rail 7 than in the embodiment of Fig. 3d. The water deflecting surface 14e deflects the water approximately 70°.

In the embodiment of Fig. 3f the supporting surface 15 has a relatively small width and the water deflecting surface 14f is approximately part-elliptical deflecting the water approximately 90°.

The simplest embodiment of the invention is shown in Fig. 3g and comprises a flat piece, the supporting surface 12g of which is aligned with the water deflecting surface 14g thereof . Since the accessory rail of this embodiment includes no horizontal supporting surface 15 as do the embodiments of Figs. 3a-f it may be mounted such that its downward directed apex 18 is located at variable vertical distances under the boat bottom, thereby enabling adjustment of the rail in order to obtain an optimum mounting position. In order to facilitate such variable mounting the rail according to this embodiment may be provided with substantially vertically extended oblong mounting holes (not shown) for screws 16.

It is common for all the embodiments shown that the surface IS of the mounting portion 11 opposed to the supporting surface 12 thereof is substantially parallel to the supporting surface 12 and is flush with a surface 20 of the rail portion 13 opposed to the water deflecting surface 14 thereof.

It should be appreciated that other means than screws can be employed for attaching the rail 7 to an existing spray rail, such as glueing. Further, a wide variety of shapes of the water deflecting surface 14 may be useful, and also different relative dimensions between the width of the supporting surface 15 and the height of the rail portion 13 counted from the substantially horizontal surface 8 of the spray rail 7.