KR20180083524A - Board for sports - Google Patents

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

{BOARD FOR SPORTS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sports board, and more particularly, to a sports board such as a ski and a snowboard or a water ski.

The number of people enjoying leisure sports in their leisure time is increasing with the seasons. In winter, there are sports such as skiing and snowboarding where you can enjoy a sense of speed on snowy fields, and water sports such as water skiing where you can enjoy the feeling of speed on the water in summer.

The commonality of these sports is that boards made to slip over water or snow while supporting the weight of the user are used. These boards are firmly fixed to the user's feet, are rigidly formed to withstand the strain due to their weight, are made thin, long and light in order to reduce the friction with water or eyes and to enhance the feeling of comfort and speed of the user.

In consideration of the characteristics of use of the board, the board for sports is generally made of a material having light and elasticity, and at the same time, has a structure capable of having sufficient rigidity and elasticity.

Depending on the material and structure of the board, the performance may vary. Especially, the boards used in the contest may directly affect the performance. For example, in the case of skiing used for ski jumping, it provides sufficient elasticity to support the weight of the user while leaning and helps to jump, and stabilizes the skiing by stabilizing the deformation applied to the ski before landing It is good to be produced.

Conventional sports boards have a lightweight structure with a positive Poisson's ratio, such as a honeycomb structure. However, although the physical characteristics required for some or all of the board vary depending on the item or situation used, it is difficult to meet all of these requirements with a limited structure.

Accordingly, it has been difficult to improve the operation by predicting a physical quantity such as a force and a moment generated in a specific portion of the board and reflecting the physical quantity on a partial structure of the board.

Therefore, a sports board having a structure different from the conventional one is required in order to grasp the structural characteristics required through the simulation of the structural or mechanical analysis through actual experiments, and to enable the performance improvement by reflecting the structural characteristics.

U.S. Patent No. 4,068,861

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional sports board, and it is an object of the present invention to provide a golf club having a core including an oggetic buffer having a negative Poisson's ratio, Or a core corresponding to a part of the core.

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

According to an aspect of the present invention, there is provided a sports board comprising: a top board and a bottom board spaced apart from each other; And a core attached between the upper plate and the lower plate, wherein the core includes an oggetic buffer made up of a negative Poisson's ratio structure.

According to an embodiment of the present invention, the oggetic buffer is formed of a plurality of unit structures arranged continuously in the transverse direction, and one unit structure includes two first sidewalls arranged to face each other, Wherein the two first sidewalls and the four second sidewalls form one closed inner space, the two first sidewalls and the four second sidewalls form one closed inner space, The adjacent two unit structures may share either the first sidewall or the second sidewall.

According to an embodiment of the present invention, at least one of the first sidewall and the second sidewall of each of the two arbitrary unit structures of the plurality of unit structures may have different lateral widths.

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

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

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

According to an embodiment of the present invention, at least one of the first sidewall and the second sidewall may be formed to be bent.

According to an embodiment of the present invention, at least one of the first sidewall and the second sidewall may be formed to extend obliquely with respect to a surface of the lower plate.

According to an embodiment of the present invention, the upper plate and the lower plate are elongated and the first side wall may be disposed to extend in the extension direction of the upper plate and the lower plate.

According to an embodiment of the present invention, the upper plate and the lower plate are elongated, and the first side wall may be disposed to face the 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 oggic cushions having a Poisson's ratio different from each other.

According to an embodiment of the present invention, the core may further include a non-oggic buffer made up of a positive Poisson's ratio structure.

According to an embodiment of the present invention, a plurality of cores stacked between the upper plate and the lower plate may be formed, and the ogle-cheek buffers of the respective cores may have a Poisson's ratio different from each other.

1 is a perspective view of a sports board according to an embodiment of the present invention.
2 is a partially enlarged incisional perspective view of the sports board of Fig. 1;
3 is a side cross-sectional view of the sports board of Fig. 1 taken along line AA.
4 is a plan view of a sports board including a core according to an example comprising an oggetic buffer and a non-oggic buffer.
Figure 5 is a schematic plan view of a single structure of the sports board of Figure 1;
6 is a plan view of an oggic cushion of a sports board according to a modified embodiment.
7 is a plan view of an oggic cushion of a sports board according to yet another modified embodiment.
8 is a plan view schematically showing a distribution of a single structure of a sports board according to a modified embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

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

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

The board for sports 100 may be various kinds of ski or snowboard, such as Alpine ski, Nordic ski, Carving ski, Short ski, Ski board, Slalom ski, Giant slalom ski, Downhill ski, or water ski board. It will be clearly understood from the following description that, in addition to the examples described above as an example of the sports board 100, various types of boards capable of supporting weight and moving along the water or eye surface may be included.

The upper plate 110 and the lower plate 120 are elongated in the transverse direction. The upper plate 110 and the lower plate 120 are formed to extend substantially in the same length. The widths of the upper plate 120 and the lower plate 120 can be set differently depending on positions between the front end and the rear end. For example, the front end and the rear end of the upper plate 120 and the lower plate 120 may have a relatively large width and the middle portion may have a relatively small width. Meanwhile, the upper plate 110 and the lower plate 120 may be formed to be flat or bent according to positions between the front end and the rear end.

The upper plate 110 and the lower plate 120 are vertically spaced. A user's foot is fixed to the upper plate 110 by a separate fixing mechanism (not shown). A load according to the weight of the user is applied to the upper plate 110. The lower plate 120 is in contact with the snowy surface and supports a load applied to the upper plate 110 with respect to the snowy surface.

Although not shown, the upper plate 110 and the lower plate 120 may have two or more plate-like structures stacked on each other. It should 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.

A 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 upper and lower plates 110 and 120 are attached to the upper and lower surfaces of the core 130 to be surrounded by the upper plate 110 and the lower plate 120, respectively.

The core 130 can transfer the force applied to the upper plate 110 and the lower plate 120 to each other, or can absorb and absorb energy therein. Hereinafter, the structure of the core 130 that affects the transmission 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 oggetic buffer 130a having a negative Poisson's ratio structure. In addition, the core 130 may include a non-oggic cushion 130b having a positive Poisson's ratio structure. 4 is illustratively shown for ease of explanation and understanding, and the size, arrangement, shape, etc. of the oggetic buffer 130a and the non-oggic buffer 130b may differ from those shown Be careful.

The Poisson's ratio represents the ratio of the compressive strain in its vertical direction to the tensile strain in the tensile direction under tensile load. The Poisson's ratio of the core 130 is set such that when a tensile load is applied to a certain first direction on the plane formed by the lower plate 120 on which the core 130 is disposed, Of the compressive strain in the second direction perpendicular to the first direction. 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 depending on the shape of the sports board 100. [

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

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

Such an augmented shock absorber 130a may be formed of a plurality of unit structures arranged continuously in the transverse direction, that is, in the direction perpendicular to the direction in which the face formed by the upper plate 110 or the lower plate 120 is oriented. As shown in FIG. 4, each of the unit structures may be longitudinally opened toward the upper plate 110 and the lower plate 120, and disposed adjacent to each other in the transverse direction.

5, one unit structure includes two first sidewalls 131 arranged to face each other, and a first sidewall 131 extending from both ends of each first sidewall 131 to an acute angle toward the first sidewall 131 And may include four second sidewalls 132 formed therein.

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

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

The first sidewall 131 is formed to have a width h in the transverse direction. As the width h of the first sidewall 131 increases, the distance between the unit structures adjacent to both ends of the first sidewall 131 increases. As the width h of the first sidewall 131 decreases, ) Approaches the distance between the adjacent unit structures.

The second sidewall 132 is formed to have a width l in the transverse direction. Also, the second sidewall 132 forms a predetermined angle? With the first sidewall 131 connected thereto.

When the angle between the first sidewall 131 and the second sidewall 132 is constant, as the width (l) of the second sidewall 132 increases, the distance between the two first sidewalls 132, The distance between the two unit structures sharing the first side wall 131 is shortened, and the distance between the two unit structures becomes closer as the width (l) of the second side wall 132 is short.

The larger the angle? Between the second sidewall 132 and the first sidewall 131 is, the larger the distance between the two first sidewalls 131 of the unit structure becomes. The closer the distance between the two unit structures that are shared, the closer the distance between the two unit structures becomes as the angle? Of the second side wall 132 becomes smaller.

Also, the thicknesses t of the first and second sidewalls 131 and 132 included in one unit structure may be adjusted to be equal to or different from each other. Thus, the density, elasticity, rigidity, etc. of the oggetic buffer 130a can be adjusted.

The plurality of unit structures constituting the above-described oggetic buffer 130a may be formed to have a predetermined size and shape. However, the plurality of unit structures may have different sizes and shapes depending on positions on the sports board 100, Or shape.

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

6, the second sidewall 132 of some unit structures has a relatively small width ll and the second sidewall 132 of some other unit structures has a relatively large width l2. . At this time, the unit structure connecting the unit structure having the small width (l1) and the unit structure having the large width (l2) has a structure in which the two second sidewalls 132 on one side have a small width (l1) 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. . At this time, since the unit structure is continuously connected from the unit structure having the small width h1 to the unit structure having the large width h2, the unit structure can be formed to have a gradually smaller width.

Thus, by adjusting the width of at least one of the first sidewall 131 and the second sidewall 132, the number of unit structures per unit area in the oggetic buffer 130a can be adjusted.

8 schematically shows the distribution of a plurality of unit structures in correspondence with the center position of one unit structure to one point. It will be readily understood that the distribution of the unit structures as shown is illustratively shown for illustrative purposes and may differ from that shown depending on the type, shape, purpose, etc. of the sports board 100.

The oggetic buffer 130a is formed such that the width h of the first sidewall 131 or the width l of the second sidewall 132 is different according to the position on the sports board 100, The unit structures are arranged densely in an anteroposterior direction and in a lateral direction and are arranged in a relatively rearward or rearward direction at some positions and at a certain position in an anteroposterior direction and in a lateral direction.

As described above, since the densities of the unit structures are set differently in the forward and backward directions or the lateral direction, the oggetic bushing 130a can have structural dynamics such as partially different elasticity and rigidity.

For example, in the central portion or the rear portion where relatively less bending deformation occurs, the density of the unit structure is relatively small, and the front portion where relatively large bending deformation may occur is relatively large in density of the unit structure .

In consideration of the fact that the warpage deformation is relatively large with respect to the longitudinal direction of the board 100 for sports, the density of the unit structure with respect to the longitudinal direction of the oggetic bushing 130a is set to be in the vertical direction of the longitudinal direction May be formed to be larger than the density of the unit structure.

On the other hand, the oggetic buffer 130a may be formed such that the height of any two unit structures of the plurality of unit structures are different from each other. The distance between the upper plate 110 and the lower plate 120 may be different due to the difference in thickness of the core 130 depending on the position of the sports board 100. For example, the portion where the relatively large stress can be applied may be designed so that the core 130 is thicker, and the portion where the relatively small stress is applied may be designed so that the core 130 is thinner.

In addition, the thickness t of at least one of the first sidewall 131 and the second sidewall 132 of each of two arbitrary unit structures of the plurality of unit structures may be different from each other. For example, the portion where the relatively large stress can be applied is designed to be thicker than the side walls 131, 132, and the portion where the relatively small stress is applied may be designed so that the side walls 131, 132 are thinner.

As described above, since the width, the thickness, the height, and the like are partially different, the oggetic buffer 130a may be formed to have a slightly different Poisson's ratio.

Meanwhile, 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 side walls 131 and 132 may be convex toward the inside of the unit structure, or may be convex toward the outside. Some of the side walls 131 and 132 may be formed to be convex inside the unit structure, and some of the other side walls 131 and 132 may be formed to be convex outside the unit structure.

At least one of the first sidewall 131 and the second sidewall 132 may be formed to extend obliquely with respect to a plane defined by the lower plate 120. In consideration of the fact that a warpage deformation at the front and rear ends is relatively large with respect to the center of the board 100 for sports, and in particular, a bending deformation is formed so as to shrink upward, the unit structure disposed on the front side has an upper opening And the unit structure disposed at the rear side may be arranged obliquely so that the upper opening faces rearward.

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

The first sidewall 110 may be disposed to face the direction perpendicular to the extending direction of the upper plate 110 and the lower plate 120. [ In addition, the unit structures may be arranged obliquely with respect to the extending direction of the upper plate 110 and the lower plate 120.

Referring again to FIG. 4, the core 130 may further include a non-oggic cushion 130b having a positive Poisson's ratio structure.

Thus, the oggetic bumper 130a is disposed at some position and the non-oggic bumper 130b (not shown) at another position in consideration of the distribution of the pressure applied to the board 100 for use and the possible bending deformation May be disposed. The non-augmented buffer 130b may also include a plurality of unit structures, and each unit structure may have a variety of 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. At this time, each of the cores 130 may include an oggetic buffer 130a having a Poisson's ratio different from each other.

For example, the upper core 130 includes an oggetic buffer 130a having a relatively larger Poisson's ratio, and the lower core 130 includes a relatively smaller Poisson's ratio. 130a. ≪ / RTI >

As another example, any of the cores 130 may include an ogotic buffer 130a and the other cores 130 may include a non-oggic buffer 130b.

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

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of 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 above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: top plate
120: lower plate
130: Core
130a: Oggetic buffer
130b: Non-Oggetic buffer
131: first side wall
132: second side wall
100: Sports board

Claims (13)

A top plate and a bottom plate arranged up and down; And
And a core attached between the upper plate and the lower plate,
Characterized in that the core comprises an oggetic buffer consisting of a negative Poisson's ratio structure. The method according to claim 1,
Wherein the oggetic buffer is formed of a plurality of unit structures arranged continuously in the transverse direction,
One unit structure includes two first sidewalls arranged to face each other and four second sidewalls extended at an acute angle toward opposite first sidewalls from both ends of each of the first sidewalls, The first sidewall and the four second sidewalls form one closed inner space,
Wherein the adjacent two unit structures share one of the first sidewall and the second sidewall. 3. The method of claim 2,
Wherein a lateral width of at least one of the first sidewall and the second sidewall of each of two arbitrary unit structures of the plurality of unit structures is different from each other. 3. The method of claim 2,
Wherein the angle between the first sidewall and the second sidewall of each of the two arbitrary unit structures of the plurality of unit structures is different from each other. 3. The method of claim 2,
Wherein the height of any two unit structures of the plurality of unit structures is different from each other. 3. The method of claim 2,
Wherein a thickness of at least one of the first sidewall and the second sidewall of each of two arbitrary unit structures of the plurality of unit structures is different from each other. 3. The method of claim 2,
Wherein at least one of the first sidewall and the second sidewall is formed to be curved. 3. The method of claim 2,
Wherein at least one of the first sidewall and the second sidewall extends obliquely with respect to a surface of the lower plate. 3. The method of claim 2,
The upper plate and the lower plate are elongated,
Wherein the first sidewall is disposed to face the extending direction of the upper plate and the lower plate. 3. The method of claim 2,
The upper plate and the lower plate are elongated,
Wherein the first side wall is disposed so as to face a direction perpendicular to an extending direction of the upper plate and the lower plate. The method according to claim 1,
Wherein the core comprises a plurality of oggic cushions of a structure having a Poisson's ratio different from each other. The method according to claim 1,
Wherein the core further comprises a non-oggic cushion of positive Poisson's ratio structure. The method according to claim 1,
And a plurality of cores stacked between the upper plate and the lower plate,
Wherein each of the cores has a structure having a Poisson's ratio different from each other.

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