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Sportsboard Stiffening System

a technology of stiffening system and surfboard, which is applied in the field of sportsboards, can solve the problems of board breaking problems, limited vertical height of wood stringers, and high cost, and achieve the effects of enhancing safety for surfboard riders, reducing costs, and reducing costs

Inactive Publication Date: 2018-05-31
RIGHTFAIR GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a break resistant composite strengthening system for surfboards. This system exhibits higher stiffness and flex recovery, making the surfboard more fracture resistant and increasing safety for surfboard riders. Compared to conventional soft surfboards, the present invention has the advantage of a flexible stiffening system with high tensile strength that can deform without casing the collapse of the core material and can return to its original position while restoring a major portion of the stored energy of bending. The fibrous profiles on the top and bottom of foam core exhibits surprising high flexural strength against external bending force. Overall, the stiffening system increases the breaking strength of the surfboard.

Problems solved by technology

Hard surfboards made by the fiberglass fabric and epoxy resin method requires a labor intensive process and results in high cost.
As a result, wood stringers of soft surfboard are usually encapsulated by the foam core and therefore the height of wood stringers in the vertical direction is limited by the thickness of surfboard foam core.
The impact from large waves can cause board breaking problems.
If the impact forces are strong enough and exceed the breaking strength of the wood stringer either in the vertical direction or the lateral direction, the surfboard fails by fracture and may pose a hazard to the user.
The fracture problem is caused by the lower flexural strength of stringers made from plywood board, timber board and resin laminated bamboo board compared to fibrous materials.
However such a change will considerably increase the weight of stringer and is not favorable for a surfboard application.
However surfboards equipped with hard fiberglass shell may be undesirable in the flex patterns because it has too little flex.
In addition, hard surfboard can cause injury to riders and therefore only suitable for experience riders.
Wood stringers have an inherent problem of high water absorption, leading to degradation and breakage of the stringers.
During surfboard usage, there are opportunities of water invasion from the fin holes seeping into the core of foam blank.
The water invasion results in degradation and breakage of the stringers.

Method used

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Examples

Experimental program
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first embodiment

[0082]In the preferred first embodiment shown in FIGS. 4 and 5, the stiffening system 10 comprises fibrous profiles 11 adhered on both the foam core top surface 12 and the foam core bottom surface 13 of the surfboard foam core 21. A foam core groove 16 formed on the surface of the foam core 21 can receive the fibrous profiles 11. The foam core groove 16 is preferably deep enough to allow the fibrous profile 11 to be encapsulated within the foam core. A typical foam core suitable for the present invention is made of expanded polystyrene foam (EPS). In the preferred embodiment, the fibrous profiles are completely or partially embedded inside the foam core such as in foam core grooves 16. The grooves can be cut as slots with a blade to create an incision. The foam core grooves 16 can receive a fibrous profile adhesive coating 17 such as a glue. In an alternative embodiment, the fibrous profiles may be bonded to the surface of the foam core. In another embodiment, a backing layer may be...

third embodiment

[0083]In an alternative embodiment, the fibrous profiles may be adhered only on the top surface of the foam core. In another alternative third embodiment, the fibrous profiles may be adhered only on the bottom surface of the foam core. Various modifications can be made without departing from the spirit and scope of the invention. For example, the fibrous profiles may be adhered on any desirable position of the stringer body and additional number of fibrous profiles may be applied to the foam core according to the requirement of mechanical properties. For example, the foam core upper rail surface 28 and the foam core lower rail surface 29 can receive fibrous profiles as well.

[0084]The fibrous profile has a cross-section of round shape, rectangle, parallelogram, triangle or any other profile shape, more preferable a round cross-section. As illustrated in FIG. 2, a typical surfboard 30 has an upturning front end 31 and an upturning tail end 32, which are commonly called the nose rocker...

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Abstract

The invention relates generally to sports boards, and more particularly to a reinforcing stiffening system for surfboards. The stiffening system comprises fibrous profiles adhered on the top surface and / or bottom surface of the surfboard foam core. The invention relates in particular to a surfboard equipped with the present stiffening system for preventing board breaking, whereas the surfboard exhibits high stiffness, flex recovery and fracture resistance, and thus enhancing safety for surfboard riders. The fibrous profiles may have a round cross-section. The foam core is encapsulated by a top laminated foam skin at a foam core top surface, and the foam core is encapsulated by an inner bottom foam layer and an outer bottom foam layer on a foam core bottom surface.

Description

FIELD OF THE INVENTION[0001]This invention relates generally to sportsboards, and more particularly to surfboards equipped with a stiffening system having a plurality of fibrous profiles.BACKGROUND OF THE INVENTION[0002]Surfboards are recreational sporting goods used for surfing in the ocean. Surfboards are typically used in a stand up position during surfing. Therefore surfboard structures are necessary reinforced to achieve high stiffness and break resistance. In general, surfboard structures can be divided into two main categories according to surfboard structures and production technology: fiberglass surfboards and non-fiberglass surfboards.[0003]A typical type one fiberglass surfboard manufacture utilizes a light density foam blank encased on both the deck surface and bottom surface with a hard coating of fiberglass cloth and resin. This type of surfboard has a hard surface and is usually referred as hard surfboard. Typical foam materials include expanded polystyrene foam (EPS)...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B63B35/79
CPCB63B35/7909B32B2266/0228B63B32/57B32B5/245B32B2262/101B32B21/10B32B5/18B63B32/40A63C2203/42B32B27/065B32B7/12
Inventor CHEUNG, KWONG KEECHEUNG, WAH KAN
Owner RIGHTFAIR GRP LTD
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