WO2018131923A1

WO2018131923A1 - Sports board

Info

Publication number: WO2018131923A1
Application number: PCT/KR2018/000601
Authority: WO
Inventors: 김도년; 도영경; 이지환
Original assignee: 서울대학교산학협력단
Priority date: 2017-01-13
Filing date: 2018-01-12
Publication date: 2018-07-19
Also published as: KR101904755B1; KR20180083524A

Abstract

A sports board comprises: an upper board and a lower board disposed to be spaced apart from each other; and a core attached between the upper board and the lower board. The core comprises an auxetic buffer part having a structure with a negative Poisson's ratio. By comprising the core comprising the auxetic buffer part, the sports board can reflect a structural characteristic in the core corresponding to the entire board or a part of the board, so as to meet a specific numerical range of required physical characteristics.

Description

Sports board

The present invention relates to a sports board, and more particularly to a sports board, such as skiing and snowboarding, or water skiing.

[Description of National Support R & D]

This research was conducted under the auspices of Seoul National University Industry-Academic Cooperation Foundation (Source Technology Development Project (Original Technology Development Project, Optimal Design and Fabrication of Ski Elasticity for Vibration Control of Jump Skis) Research, task unique number: 0420-20160093).

Seasonally, the population of leisure sports in leisure time is increasing. In winter, there are sports such as skiing and snowboarding on a snowy field, and in summer, there are sports such as water skiing on the water.

What these sports have in common is the use of boards designed to slide over water or snow while supporting the user's weight. These boards are reliably fixed to the user's feet and are rigidly formed to withstand weight-related deformations, while being generally thin, long and light for reduced friction with water or eyes, and increased wear and speed.

Considering the characteristics of the use of such a board, sports boards are generally made of a light and elastic material, and at the same time is manufactured to have a structure capable of having sufficient rigidity and elasticity.

Performance may vary depending on the material and structure of the board. In particular, the board used in the competition may directly affect the performance. For example, skis used for ski jumping provide sufficient support for the user's weight when jumping, and provide resilience to jump, allowing for stable landing by frequent and stabilizing deformations applied to skis before landing. It is good to be made.

Existing sports boards disclosed in U.S. Patent No. 4,068,861 are made of a lightweight structure with a generally positive Poisson's ratio, such as a honeycomb structure. However, it is difficult to meet all of these requirements with a limited structure, although the physical properties required for some or all of the boards vary depending on the sport or situation used.

Accordingly, it is difficult to improve the operation by predicting physical quantities such as forces and moments occurring in specific portions of the board and reflecting them in the partial structure of the board.

Accordingly, a sports board having a structure different from the existing structure is required to identify structural characteristics required through structural dynamic analysis through simulation or actual experiment, and to reflect performance thereof to enable performance improvement.

The present invention has been made to solve the above-described problems of the conventional sports board, including the core having an aggogetic buffer having a negative Poisson's ratio, so as to satisfy the specific numerical range for the required physical characteristics Another object is to provide a sports board capable of reflecting structural features on a core corresponding to a part thereof.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

Sports board according to an embodiment of the present invention for solving the above problems is the top and bottom plates spaced apart up and down; And a core attached between the upper plate and the lower plate, wherein the core includes an oggetic buffer configured to have a negative Poisson's ratio.

According to one embodiment of the present invention, the aggistical buffer portion is formed of a plurality of unit structures that are continuously disposed in the transverse direction, one unit structure is two first side walls disposed to face each other, and each of the first Four second sidewalls extending at an acute angle from both ends of the first sidewall toward the opposite first sidewall, wherein the two first sidewalls and the four second sidewalls form one closed inner space, Two adjacent unit structures may share one of the first sidewall and the second sidewall.

According to one embodiment of the present invention, at least one of the first sidewall and the second sidewall of each of the two unit structures of the plurality of unit structures may be different from each other.

According to an embodiment of the present invention, the magnitude of the angle formed by the first sidewall and the second sidewall of each of the two unit structures of the plurality of unit structures may be different from each other.

According to an embodiment of the present invention, the heights of any two unit structures among the plurality of unit structures may be different from each other.

According to an embodiment of the present invention, thicknesses of at least one of the first sidewall and the second sidewall of each of the two unit structures of the plurality of unit structures may be different from each other.

According to one embodiment of the present invention, one or more of the first side wall and the second side wall may be formed to be bent.

According to one embodiment of the present invention, one or more of the first side wall and the second side wall may be formed obliquely extending to the surface formed by the lower plate.

According to an embodiment of the present invention, the upper plate and the lower plate may be formed to extend in length, and the first side wall may be disposed to face the extending direction of the upper plate and the lower plate.

According to an embodiment of the present invention, the upper plate and the lower plate may be formed to extend in length, and the first sidewall may be disposed to face in a direction perpendicular to the extending direction of the upper plate and the lower plate.

According to an embodiment of the present invention, the core may include a plurality of augitive buffers having a structure having different Poisson's ratios.

According to an embodiment of the present invention, the core may further include a non-oggetic buffer having a positive Poisson's ratio.

According to an embodiment of the present invention, a plurality of cores are stacked between the upper plate and the lower plate, and each of the core buffer portion of the core may have a structure having a different Poisson's ratio.

1 is a perspective view of a sports board according to an embodiment of the present invention.

2 is a partially enlarged perspective view of the sports board of FIG. 1.

3 is a side cross-sectional view of the sports board of FIG. 1 along line A-A.

4 is a plan view of a sports board comprising a core according to one example comprising an aggressive buffer and a non-ogetic buffer.

5 is a schematic plan view of a unitary structure of the sporting board of FIG. 1.

FIG. 6 is a plan view of an aggressive buffer of a sports board according to a modified embodiment. FIG.

FIG. 7 is a plan view of an ugly shock absorbing part of a sports board according to another modified embodiment; FIG.

8 is a plan view schematically showing the distribution of a single structure of a sports board according to a variant embodiment.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

Shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated items. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'comprises', 'haves', 'consists of' and the like mentioned in the present specification, other parts may be added unless 'only' is used. In the case where the component is expressed in the singular, the plural includes the plural unless specifically stated otherwise.

In interpreting a component, it is interpreted to include an error range even if there is no separate description.

In the case of the description of the positional relationship, for example, if the positional relationship of the two parts is described as 'on', 'upon', 'lower', 'next to', etc. Alternatively, one or more other parts may be located between the two parts unless 'direct' is used.

References to elements or layers "on" other elements or layers include all instances where another layer or other element is directly over or in the middle of another element. Like reference numerals refer to like elements throughout.

Although the first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another. Therefore, of course, the first component mentioned below may be a second component within the technical spirit of the present invention.

The size and thickness of each component shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated configuration.

Each of the features of the various embodiments of the present invention may be combined or combined with each other in part or in whole, various technically interlocking and driving as can be understood by those skilled in the art, each of the embodiments may be implemented independently of each other It may be possible to carry out together in an association.

Hereinafter, a sports board according to an embodiment of the present invention will be described.

1 to 3, the sports board 100 according to an embodiment of the present invention includes an upper plate 110, a lower plate 120, and a core 130.

The sports board 100 may be various types of skis or snowboards, such as alpine skiing, Nordic skiing, carving skiing, short skiing, skiing boards, slalom skiing, giant slalom skiing, downhill skiing, or water skiing. Through the following description, it will be clearly understood that, in addition to the above-described examples of the sports board 100, various types of boards that can support weight and move along the water or snow surface may be included.

The upper plate 110 and the lower plate 120 is formed to extend in the transverse direction. The upper plate 110 and the lower plate 120 is formed to extend to almost the same length. The width of the upper plate 120 and the lower plate 120 may be set differently depending on the position between the front end and the rear end. For example, the front and rear ends of the upper plate 120 and the lower plate 120 may be formed relatively large in width, and the central portion thereof may be formed relatively small in width. On the other hand, the upper plate 110 and the lower plate 120 may be formed flat or bent depending on the position between the front and rear ends.

The upper plate 110 and the lower plate 120 are spaced apart vertically. The user's feet are fixed to the top plate 110 by a separate fixing mechanism (not shown). The upper plate 110 is subjected to a load according to the weight of the user. The lower plate 120 contacts the tongue and supports the load applied to the upper plate 110 with respect to the tongue.

Although not shown, the upper plate 110 and the lower plate 120 may be formed of two or more plate-like structures each stacked. It is to be understood that the structure and shape of the upper plate 110 and the lower plate 120 can be variously designed through known sports boards.

The core 130 is attached between the upper plate 110 and the lower plate 120. The core 130 has substantially the same planar shape as the upper plate 110 and the lower plate 120. The core 130 is surrounded by the upper plate 110 and the lower plate 120 by attaching the upper plate 110 and the lower plate 120 to the upper and lower surfaces, respectively.

The core 130 may transfer forces applied to the upper plate 110 and the lower plate 120 to each other, or absorb and offset energy therein. Hereinafter, the structure of the core 130 affecting the transfer and absorption of energy between the upper plate 110 and the lower plate 120 will be described in detail.

Referring to FIG. 4, the core 130 includes an optical buffer 130a formed of a structure of a negative Poisson's ratio. In addition, the core 130 may include a non-ogetic buffer 130b having a positive Poisson's ratio structure. Figure 4 is shown by way of example for convenience of explanation and understanding, the size, arrangement, shape, etc. of the augmentary buffer portion 130a and non-oggetic buffer portion 130b may be different from that shown. Be careful.

Poisson's ratio represents the ratio of compressive strain in its vertical direction to tensile strain in the tensile direction under tensile load. The Poisson's ratio of the core 130 is the first direction with respect to the tensile strain in the first direction when a tensile load is applied in any first direction on the surface formed by the lower plate 120 on which the core 130 is disposed. It can be defined as the ratio of the compressive strain in the second direction perpendicular to the. On the other hand, it should be noted that the direction or plane in which the Poisson's ratio of the core 130 is determined may be set differently according to the shape of the sports board 100.

Since the aggressive buffer portion 130a has a negative Poisson's ratio, it expands in a direction perpendicular thereto when it is extended in the direction in which the tension is applied. For example, as the tensile load is applied to the aggressive buffer 130a in the extending direction of the upper plate 110, the aggressive buffer 130a extends in the width direction of the upper plate 110.

Correspondingly, when the compressed buffer 130a is compressed in the direction in which the pressure is applied, it also contracts in the direction perpendicular thereto.

The optical buffer unit 130a may be formed of a plurality of unit structures that are continuously disposed in a horizontal direction, that is, a direction perpendicular to the direction of the surface formed by the upper plate 110 or the lower plate 120. As shown in FIG. 4, each unit structure may be opened in the longitudinal direction toward the upper plate 110 and the lower plate 120, and disposed to be adjacent to each other in the transverse direction.

Referring to FIG. 5, one unit structure extends acutely toward two first sidewalls 131 disposed to face each other and opposite first sidewalls 131 from opposite ends of each first sidewall 131. Four second sidewalls 132 may be formed.

In addition, two adjacent unit structures share one of the first sidewall 131 and the second sidewall 132. That is, two unit structures sharing two first sidewalls 131 and four unit structures sharing four second sidewalls 132 may be disposed around one unit structure.

Two first sidewalls 131 and four second sidewalls 132 constituting one unit structure form one closed inner space. The second sidewall 132 extending from both ends of each of the first sidewalls 131 may be connected to the second sidewall 132 extending from the opposite first sidewall 131. At the point where the two second sidewalls 132 are connected, the first sidewalls 131 of the unit structure sharing each second sidewall 132 may be connected together. That is, two second sidewalls 132 and one first sidewall 131 may be connected to one connection point.

The first side wall 131 is formed to have a width h in the lateral direction. The larger the width h of the first side wall 131 is, the farther the distance between the unit structures adjacent to both ends of the first side wall 131 is obtained, and the smaller the width h of the first side wall 131 is the first side wall 131. The distance between the unit structures adjacent to both ends of the () closes.

The second side wall 132 is formed to have a width l in the transverse direction. In addition, the second sidewall 132 forms a predetermined angle θ with the first sidewall 131 connected thereto.

When the angle between the first sidewall 131 and the second sidewall 132 is constant, the greater the width ℓ of the second sidewall 132, the two first sidewalls of the unit structure including the second sidewall 132. The distance between the unit structures on both sides sharing the 131 is greater, and the smaller the width l of the second sidewall 132 is, the closer the distance is between the two unit structures.

In addition, when the width ℓ of the second sidewall 132 is constant, the larger the angle θ between the second sidewall 132 and the first sidewall 131 is, the two first sidewalls 131 of the unit structure are separated. The distance between the unit structures on both sides that are shared is increased, and the smaller the angle θ of the second sidewall 132 is, the closer the distance is between the two unit structures.

In addition, the thickness t of the first sidewall 131 and the second sidewall 132 included in one unit structure may be adjusted to be the same or different from each other. As a result, the density, elasticity, rigidity, and the like of the optical buffer 130a may be adjusted.

The plurality of unit structures constituting the above-described optical buffer unit 130a may all be formed to have a predetermined size and shape, but different sizes to have different physical characteristics according to respective positions on the sports board 100. Or it may be formed to have a shape.

Transverse widths of at least one of the first sidewall 131 and the second sidewall 132 of each of the two unit structures of the plurality of unit structures may be different from each other.

Referring to FIG. 6, the second sidewall 132 of some unit structures has a relatively small width l1, and the second sidewall 132 of some other unit structures has a relatively large width l2. Can be. In this case, in the unit structure connecting the unit structure having the small width l1 and the unit structure having the large width l2, the two second sidewalls 132 on one side have a small width l1, The two side walls 132 are formed to have a large width l2.

Referring to FIG. 7, the first sidewall 131 of some unit structures has a relatively small width h1, and the first sidewall 131 of some other unit structures has a relatively large width h2. Can be. In this case, as the unit structures having the small width h1 are continuously connected to the unit structures having the large width h2, the unit structures may be formed to have smaller and smaller widths.

As such, the width of one or more of the first sidewall 131 and the second sidewall 132 may be adjusted, such that the number of unit structures per unit area in the aggressive buffer 130a may be adjusted.

FIG. 8 schematically illustrates a distribution of a plurality of unit structures by corresponding a central position of one unit structure to one point. Distribution of the unit structure as shown is shown by way of example for illustrative purposes, it will be readily understood that it may differ from that shown according to the type, shape, purpose, etc. of the sports board 100.

The aggressive buffer portion 130a is formed such that the width h of the first side wall 131 or the width l of the second side wall 132 differs depending on the position on the sports board 100. The unit structure may be formed so as to be densely disposed in the front, rear, and lateral directions, in some positions, relatively coarse in the front, or side, and in some positions, coarse in the front, rear, and side.

As such, as the density of the unit structure is set differently in the front and rear or side directions, the aggistical buffer 130a may have structural characteristics such as partially different elasticity and rigidity.

For example, the central portion or the rear portion where the bending deformation is relatively small is relatively low in density of the unit structure, and the front portion where the bending deformation is relatively large may be formed relatively in the density of the unit structure. Can be.

In addition, in consideration of the fact that the bending deformation is relatively large with respect to the longitudinal direction of the sports board 100, the aggistical buffer unit 130a has a density of the unit structure with respect to the longitudinal direction, in It may be formed to be larger than the density of the unit structure for.

On the other hand, the aggressive buffer unit 130a may be formed such that the heights of any two unit structures among the plurality of unit structures are different from each other. As a result, the thickness of the core 130 is different according to the position of the sports board 100, so that the interval between the upper plate 110 and the lower plate 120 may be different. For example, a portion to which relatively large stress can be applied is designed to have a thicker core 130, and a portion to which a relatively small stress is applied may be designed to be thinner to a core 130.

In addition, the thickness t of at least one of the first sidewall 131 and the second sidewall 132 of each of the two unit structures of the plurality of unit structures may be different from each other. For example, portions where relatively large stress can be applied are designed with thicker sidewalls 131 and 132, and portions where relatively small stress is applied may be designed with thinner sidewalls 131 and 132.

As such, as the widths, thicknesses, heights, and the like are different from each other, the optical buffer 130a may be formed to have different Poisson's ratios.

Although not shown, at least one of the first sidewall 131 and the second sidewall 132 may be formed to be bent. That is, the

sidewalls

131 and 132 may be convexly formed inside the unit structure or may be formed outwardly convex. In addition, some

sidewalls

131 and 132 may be convexly formed inside the unit structure, and

other sidewalls

131 and 132 may be formed convexly outside the unit structure.

In addition, one or more of the first sidewall 131 and the second sidewall 132 may be formed obliquely with respect to the surface of the lower plate 120. The bending deformation at the front and rear ends may be relatively large with respect to the center of the sports board 100, and in particular, considering that the bending deformation is formed to retract upward, the unit structure disposed at the front side has an upper opening. The unit structure disposed obliquely toward the front and disposed at the rear side may be obliquely disposed with the upper opening facing rearward.

Since the unit structure of the optical buffer unit 130a having the same shape as in the present embodiment has a different shape with respect to the front, rear, and side, the unit structure may have different characteristics with respect to the front, rear, or side. In consideration of this point, the first sidewall 131 may be disposed to face the extending direction of the upper plate 110 and the lower plate 120, as shown in FIG. 4.

On the contrary, the first sidewall 110 may be disposed to face in a direction perpendicular to the extending direction of the upper plate 110 and the lower plate 120. In addition, the unit structures may be disposed obliquely with respect to the extending directions of the upper plate 110 and the lower plate 120.

Referring back to FIG. 4, the core 130 may further include a non-oggetic buffer 130b having a positive Poisson's ratio.

Thus, in consideration of the distribution of the pressure exerted on the sports board 100 during use and the possible bending deformation, the agglutination buffer 130a is disposed at some positions, and the non-aggressive buffer 130b is disposed at other positions. ) May be arranged. The non-ogetic buffer 130b may also include a plurality of unit structures, and each unit structure may be formed of various known structures having a positive Poisson's ratio, such as a honeycomb shape.

Although not shown, a plurality of cores 130 may be stacked between the upper plate 110 and the lower plate 120. In this case, each of the cores 130 may include an optical buffer unit 130a each having a structure having a different Poisson's ratio.

For example, the upper core 130 includes an oggetic buffer 130a having a relatively larger Poisson's ratio, and the lower core 130 has an oggetic buffer of a structure having a relatively smaller Poisson's ratio. It may include a portion 130a.

As another example, any core 130 may include an aggressive buffer 130a, and another core 130 may include a non-ogetic buffer 130b.

As described above, cores of various structures may be manufactured in consideration of the shape, size, direction, arrangement, distribution, and the like of the unit structure. The specific design of the core calculates the pressure distribution, energy absorption, tensile stress, shear stress, yield stress, hysteresis, etc. on the board through experiments and simulations of actual operation and structural dynamic analysis. It may be determined by calculating a specific numerical range according to physical properties such as elasticity, density, and rigidity.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

[Description of the code]

110: tops

120: bottom plate

130: core

130a: ogetic buffer

130b: non-oggetic buffer

131: first sidewall

132: second side wall

100: sports board

Claims

An upper plate and a lower plate spaced apart up and down; And

It includes a core attached between the upper plate and the lower plate,

The core is a sports board, characterized in that it comprises an optical buffer portion made of a negative Poisson's ratio.
According to claim 1,

The optical buffer portion is formed of a plurality of unit structures that are continuously disposed in the transverse direction,

One unit structure includes two first sidewalls disposed to face each other, and four second sidewalls extending at an acute angle from opposite ends of each of the first sidewalls toward opposite first sidewalls, the two The first side wall and the four second side walls form one closed inner space,

Two adjacent unit structures, the sports board, characterized in that sharing any one of the first side wall and the second side wall.
The method of claim 2,

And a lateral width of at least one of the first sidewall and the second sidewall of each of the two unit structures of the plurality of unit structures is different from each other.
The method of claim 2,

Sports board, characterized in that the magnitude of the angle formed by the first side wall and the second side wall of each of the two unit structures of the plurality of unit structures are different from each other.
The method of claim 2,

Sports board, characterized in that the height of any two unit structures of the plurality of unit structures are different from each other.
The method of claim 2,

Sports board, characterized in that the thickness of at least one of the first side wall and the second side wall of each of the two unit structures of the plurality of unit structures are different from each other.
The method of claim 2,

At least one of the first side wall and the second side wall is a sports board, characterized in that the formed bent.
The method of claim 2,

At least one of the first side wall and the second side wall is a sports board, characterized in that extending obliquely to the surface formed by the lower plate.
The method of claim 2,

The upper plate and the lower plate is formed to extend long,

The first side wall is a sports board, characterized in that disposed to face the extension direction of the upper plate and the lower plate.
The method of claim 2,

The upper plate and the lower plate is formed to extend long,

The first side wall is a sports board, characterized in that disposed to face in a direction perpendicular to the extending direction of the upper plate and the lower plate.
According to claim 1,

The core board is a sports board, characterized in that it comprises a plurality of augmentary buffer portion made of a structure having a different Poisson's ratio.
According to claim 1,

The core is a sports board, characterized in that it further comprises a non-oggetic buffer portion made of a positive Poisson's ratio.
According to claim 1,

It includes a plurality of cores stacked between the upper plate and the lower plate,

Sports board, characterized in that the augitive buffer portion of each core is made of a structure having a different Poisson's ratio.