Support Block for a Watercraft
A support block for a watercraft which can include a pontoon having a keel strip, comprises a curved upper surface for accommodating the bottom of the watercraft, wherein upper surface has a radius of curvature that is larger than the radius of curvature of the bottom of the watercraft, and the block is made from a material that will deform when loaded such that the upper surface will conform to the radius of the bottom of the watercraft. The upper surface of the block can have a notch for accommodating the keel strip.
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This application claims the benefit of U.S. provisional application No. 61/057,526, filed May 30, 2008, which is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTIONIt is often necessary to take watercraft out of the water for storage. The watercraft can be placed on a support structure so that it does not rest directly on the ground. Watercraft such as pontoon boats have at least one, usually two, pontoons that are cylindrical in shape and have a thin keel strip running along the bottom-most portion of the pontoon. Previously, supports for pontoon boats have been made from hard materials such as concrete, wood, or hard plastic have been used to support pontoon boats. When using a hard support, all of the weight of the boat is concentrated on the contact point between the keel strip and the support. This support arrangement can damage the bottom of the pontoon.
SUMMARY OF THE INVENTIONAccording to the invention, a support block for a watercraft comprises a curved upper surface for accommodating the bottom of the watercraft, wherein upper surface has a radius of curvature that is larger than the radius of curvature of the bottom of the watercraft, and the block is made from a material that will deform when loaded such that the upper surface will conform to the radius of the bottom of the watercraft. The watercraft can have at least one pontoon with a keel strip, and the upper surface of the block can have a V-shaped notch for accommodating the keel strip.
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The support block 12 of any of the embodiments can be fabricated from a resilient polymeric material, such as expanded polystyrene foam. The density of the support block 12 can be configured to compress or deform when loaded, such as with the watercraft 100 (
Testing performed in accordance with ASTM C578-07 entitled “Specification for Rigid, Cellular Polystyrene Thermal Insulation” and ASTM D1621-04a entitled “Method for Compressive Properties of Rigid Cellular Plastics” has shown that the support block 12 made from a polystyrene foam having a density within the given range of 1.1 lbs/ft3 to 1.5 lbs/ft3, an upper wall 24 with a surface area of approximately 76 in2, a base 14 with a surface area of approximately 96 in2, and a height between the base 14 and the planar surfaces 28, 30 of approximately 10.75 inches is capable of withstanding a compressive force of approximately 20 psi. Therefore, each such support block 12 is capable of supporting a load of approximately 1,520 lbs (76 in2×20 psi). Therefore, four such support blocks 12 can support a load over 6000 pounds, with some distortion. This is more the sufficient to support many types of watercraft 100 on the market. For example, a pontoon boat having a length of 21 ft. with a 50 hp motor weights approximately 2,300 lbs. A pontoon boat having a length of 25 ft. with a 90 hp motor weights approximately 3,500 lbs.
The invention provides a support system for a watercraft 100 comprising at least one support block 12 is lightweight, provides stability, evenly distributes the weight of the watercraft 100, reduces stress on the watercraft 100, and can fit watercrafts of many different sizes. The compression of the support block 12 evenly distributes the weight of the pontoon 102 over a larger surface area than if the support block 12 did not compress or conform. Moreover, the compression of the support block 12 increases the stability of the pontoon 102 on the support block 12 because the pontoon is cradled by the deflection and deformation of the upper surface 24 and lateral walls 20, 22. Furthermore, the support block 12 further reduces stress on the pontoon 102 by providing a stable surface even on uneven ground through the contouring ability of the support block 12. The radius of curvature R of the concave surface 26 can be deliberately shallower than the radius of curvature RP of known pontoons 102 to enable the support block 12 to fit any size pontoon 102.
While the invention has been specifically described in connection with certain specific embodiments thereof, it is to be understood that this is by way of illustration and not of limitation. Reasonable variation and modification are possible within the scope of the forgoing disclosure and drawings without departing from the spirit of the invention which is defined in the appended claims.
Claims
1. A support block for a watercraft having a bottom having an effective radius of curvature comprising:
- a deformable body having an upper surface, a lower surface, and a peripheral wall connecting the upper and lower surface; and
- a concave portion provided in the upper surface and having a radius of curvature that is greater than the effective radius of curvature of the bottom of the watercraft;
- wherein the body is made from a material that will deform when loaded such that the concave portion will conform to the bottom of the watercraft.
2. The support block according to claim 1, wherein the material comprises expanded polystyrene foam.
3. The support block according to claim 1, wherein the material comprises a density of approximately 1.1 lbs/ft3 to 1.5 lbs/ft3.
4. The support block according to claim 1, wherein the concave portion has radius of curvature of approximately 21 to 27 inches.
5. The support block according to claim 1, wherein the concave portion has radius of curvature of approximately 25 inches.
6. The support block according to claim 1 and further comprising a channel formed in the upper surface for accommodating a keel strip on the bottom of the watercraft.
7. The support block according to claim 6, wherein the channel is formed in the nadir of the concave portion.
8. The support block according to claim 6, wherein the channel is V-shaped.
9. The support block according to claim 6, wherein the channel is trapezoid-shaped.
10. The support block according to claim 1, wherein upper surface further comprises a pair of planar portions that join the concave portion to the peripheral wall.
11. The support block according to claim 1, wherein the body further comprises a rectilinear base defining the lower surface and the peripheral wall comprises a pair of opposing parallel walls and a pair of opposing angled walls joined to the base.
12. The support block according to claim 1, wherein the watercraft is a pontoon boat having at least one pontoon, and the effective radius of curvature is the radius of curvature of the pontoon.
13. A support block system for a pontoon boat having at least two pontoons, each with a predetermined radius of curvature, the system comprising:
- a plurality of support blocks, each support block comprising a deformable body having an upper surface, a lower surface, and a peripheral wall connecting the upper and lower surface, and a concave portion provided in the upper surface and having a radius of curvature that is greater than the predetermined radius of curvature of the at least two pontoons, wherein the body is made from a material that will deform when loaded such that the concave portion will conform to the at least two pontoons.
14. The support block system according to claim 13, wherein the material comprises expanded polystyrene foam.
15. The support block system according to claim 13, wherein the material comprises a density of approximately 1.1 lbs/ft3 to 1.5 lbs/ft3.
16. The support block system according to claim 13, wherein the concave portion has radius of curvature of approximately 21 to 27 inches.
17. The support block system according to claim 13, wherein the concave portion has radius of curvature of approximately 25 inches.
18. The support block system according to claim 13, wherein each support block further comprises a channel formed in the upper surface for accommodating a keel strip on the at least two pontoons.
Type: Application
Filed: May 29, 2009
Publication Date: Dec 31, 2009
Applicant: Grand Packaging, LLC (Wayland, MI)
Inventors: David Clark (Edwardsburg, MI), Andre L. Levesque (Chagrin Falls, OH)
Application Number: 12/474,519