Protecting the edges of sports boards

Abstract

An edge protector for a sports board in the form of a bead of a resilient material having a cross-section comprising a central portion and, extending therefrom in one direction, a tapering impact-absorbing section and, extending from the central portion in the opposing direction, a pair of convergent leg sections for engaging an edge of the board. The central portion and the impact-absorbing section together form a triangular cross-section, which is particularly suited to receiving and dissipating an impact. The triangular section can be a hollow triangular section to reduce weight and tailor the impact response. One leg of the pair extends beyond the other leg to case fitting. The bead is preferably formed by extrusion; silicone with a Shore A hardness of between 62 and 68 provides an ideal resilient material.

Claims

1. An edge protector for a sports board in the form of a bead of a resilient material having a cross-section comprising a central portion and, extending therefrom in one direction is a tapering impact-absorbing section and extending from the central portion in an opposing direction is a pair of convergent leg sections, the central portion and pair of convergent legs provided for engaging an edge of a sports board therein, wherein the central portion and the impact-absorbing section together form a hollow triangular cross-section and wherein the central portion has a non-uniform thickness, the central portion having an increasing thickness between bases of each leg section in the pair of convergent leg sections.

2. The edge protector according to claim 1 in which the hollow triangular section has a wall thickness of at least 4 mm.

3. The edge protector according to claim 1 in which the central portion forms one side of the triangle and the impact-absorbing section is provided by the remaining two sides of the triangle.

4. The edge protector according to claim 1 in which one leg of the pair extends beyond the other leg, providing a shorter leg section and a longer leg section in the pair of convergent leg sections.

5. The edge protector according to claim 1 in which the leg sections have a cross-sectional thickness of between 2 mm and 4.5 mm.

6. The edge protector according to claim 1 in which the legs are narrower at their tip than at their base.

7. The edge protector according to claim 1 in which the bead is formed by extrusion.

8. The edge protector according to claim 1 in which the resilient material is silicone.

9. The edge protector according to claim 8 in which the silicone has a Shore A hardness of between 62 and 68.

10. The edge protector according to claim 1 in which the cross-section of the bead is substantially constant along its length.

11. The edge protector according to claim 1 in which the sports board is one of a snowboard, a ski, a surfboard, a body board or a skateboard.

12. The edge protector according to claim 1 and wherein the edge protector is removably fitted to an edge of a sports board.

13. The edge protector according to claim 4 wherein the central portion becomes thicker toward the base of a shorter leg of the of pair of convergent legs.

14. The edge protector according to claim 4 wherein at a base of the longer leg section the central section is at least 4 mm thick, and the thickness of the central portion increases toward a base of the shorter leg section to a thickness of at least approximately 6 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) An embodiment of the present invention will now be described by way of example, with reference to the accompanying figures.

(2) FIG. 1 shows a cross-section through an edge protector according to the present invention.

(3) FIG. 2 shows a view of a length of edge protector according to the present invention.

(4) FIG. 3 shows a snowboard fitted with the edge protector of the present invention.

(5) FIG. 4 shows a section through the edge of a snowboard fitted with the edge protector of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) FIGS. 1 to 4 show an edge protector suitable for limiting or reducing the damage to a snowboard whilst in transit. With appropriate adjustments to its dimensions, the same design can be employed as an edge protector for other types of sports boards such as a ski, a surfboard, a body board or a skateboard. The principal aim is to enable the board to withstand a severe impact such as from being dropped and/or absorbing the force of a luggage item colliding whilst in airline transit. In the inventors' experience, it is fairly common to see oversized baggage being thrown in piles at airport collection areas. To achieve this, a design should fit the sidewall of a variety of snowboard shapes/sizes whilst retaining the ability to grip and stay in place. Flexibility and strength are other important factors.

(7) A snowboard can vary in appearance, but in most cases the sidewall dimensions vary only very little between the various manufacturers. The sidewall is the section which has been created when the top and bottom of the board is formed with a number of layers sandwiched together between them. The top layer usually covers a smaller surface area than the bottom layer and therefore the top layer is set back/offset from the bottom/base. This is critical to ensuring the steel base edge of the board is in contact with snow or ice at the point of a turn to ensure stability and grip. A snowboard is taperedthicker in the middle and becoming thinner towards the nose and tail to ensure greater flexibility. The thickness of the sidewall is typically about 10 mm in the middle of the board and about 4 mm at the edges.

(8) The majority of snowboards have the same round shape at the nose and tail, however some are designed differently to allow for deeper snow conditions or different style/type of ride. Common variations include a longer pointed nose, or a fish tail (similar to a surfboard) at the rear.

(9) The design shown in the figures is able to hold position around the majority of snowboard shapes. It is in the form of an elongate extruded bead of industrial grade silicone with a Shore A hardness of 65, a grade selected for providing the most effective blend of strength, grip, and flexibility. We have determined that a hardness of 62 or 62.5 to 67.5 or 68 is acceptable, with 65 being the target for this product. The properties of silicone offer flexibility, varying degrees of strength, hardness, and impact absorption which work to ensure long term durability and addresses the fundamental objective of protecting the board. The Shore hardness range noted above combines the necessary hardness to meet the protective requirements with a degree of flexibility that enables the protector to meet the required shape and grip.

(10) The processes for extruding Silicone are well characterised and will be familiar to those skilled in that art. Generally, it requires that the silicone is forced through a custom die which has a unique shape through which the silicone is forced. The shape of the die can be cut using a CNC machine. FIG. 1 shows the cross-sectional shape 10 created by the die according to the present invention. It consists of a generally triangular section 12 made up of a central base section 14 from which extend the other two sides 16, 18 of the triangle to form a generally equilateral shape. The triangle is made up of 4 mm (minimum) thick walls (except as noted below) and in this design has a hollow centre 20 in the shape of a similar triangle with a minimum of 4 mm long sides. This hollow centre saves weight and material, and also allows the triangular section to deform more easily under load; along with the wall thickness, this allows the impact properties of the protector to be tailored to provide an ideal balance between strength and flexibility. The triangular shape also spreads the impact force over most of the central section 14 thus dissipating the force.

(11) Two legs 22, 24 extend from the other side of the central section 14, directed in the opposite direction to the triangular impact-absorbing section 12 in order to allow the protector 30 to be attached to the base and top surface covering the sidewall and steel edge of a snowboard. The legs are in the form of strips of 4 mm thick silicone, tapering in their outer halves 26, 28 down to approximately 2.3 mm. In the relaxed state shown in FIG. 1, the legs are angled together and almost meet at their tips. As a result of being angled together, they must be flexed apart in order to insert an edge between them; this allows the legs to grip the edge and retain the protector in place. One leg 22 is made slightly longer than the other leg 24 in order to make the process of insertion, application easier; the edge of the board can be pressed against the end of the longer leg 22 in order to open that leg and allow the legs to separate 22, 24.

(12) The central section 14 has a non-uniform thickness, becoming approximately 50% thicker toward the base of the shorter leg 24 to act as an anti rocking structure that prevents lateral movement when the protector is fitted. Thus, at the base of the longer leg 22 the central section 14 is (minimum) 4 mm thick, which increases steadily toward the base of the shorter leg 24 to a thickness of approximately 6 mm.

(13) FIG. 2 shows a short length of the protector 30 strip in the form of an elongate bead with a substantially uniform cross-section 10 corresponding to that shown in FIG. 1. The product is made as one complete unit by extrusion, as noted above. As a result, it does not have parts or features which require maintenance. FIG. 3 shows the protector 30 applied to a snowboard 32, extending in a long loop around the edge 34 of the snowboard 32. The protector 30 starts at one end 36 which is ideally located along a long edge of the snowboard 32 where it is approximately straight or concave and the protector is unlikely to become detached. It extends around the length of the edge 34 to its other end 38 which can but up or end close to the start 36. As the perimeter lengths of snowboards vary, the protector can be provided in a slightly oversize form for trimming by the end user as required, or it can be provided in a standard size allowing for a gap between the ends which (in practice) will not adversely affect the protection offered.

(14) FIG. 4 shows a section through the edge 34 of a snowboard 32 to which the protector 30 has been fitted. The legs 22, 24 are spread apart from their relaxed inwardly-angled position shown in FIG. 1 and grip the faces of the board 32 to provide the necessary friction to retain the protector 30 in place on the edge 34 of the board 32. The triangular section 12 extends away from the edge 34 and is thus located to accept and dissipate any incoming impacts.

(15) Prototypes (of varying hardness) were tested using metal hammers to investigate the resilience of each prototype to the board's edge when subjected to force. The two factors that were most relevant were the point at which the silicone split against the steel rim of the board, and the resilience of the protector to the force of the hammer. We found the breaking point of the silicone at Shore A 65 was not easily reached, requiring a very strong force to eventually split the product against the board's edge. We also found that if the surface or inner seam of the protector splits slightly due to an impact, then that is still acceptable as the integrity of the board is still protected by the remainder of the triangular section.

(16) Silicone offers a number of benefits in practice, including a resilience risk of general damage (not just in transit), stable properties over a wide range of temperatures, resistance to fungal or moisture damage, ease of application even with repeated usage, a pleasant aesthetic image and feel, and the ability to retain its properties over a long time without the need for regular maintenance.

(17) It will of course be understood that many variations may be made to the above-described embodiment without departing from the scope of the present invention.