Cushioning structure and supporter including the same

Abstract

To provide a cushioning structure with high impact reduction performance.SOLUTION: A cushioning structure 10 includes a plurality of warp yarns 30 made of synthetic resin, radially extending from a central part 26 to an outer peripheral part 27 with respect to a reference plane, and a plurality of weft yarns 40 made of synthetic resin, extending in a circumferential direction so as to connect between the adjacent warp yarns 30 with respect to the reference plane. Each of the warp yarns 30 has an upper warp yarn portion 31 and a lower warp yarn portion 32, where the upper warp yarn portion 31 and the lower warp yarn portion 32 are rod-like structures provided at a prescribed interval in a direction perpendicular to the reference plane. Each weft yarn 40 is a plate-like structure connected to the upper warp yarn portion 31 and the lower warp yarn portion 32 of each of the adjacent warp yarns 30, and has a bent cross-sectional shape in a direction perpendicular to the reference plane. The cushioning structure 10, as a whole, has a flat shape extending along the reference plane.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a buffer structure, a supporter including the same, and particularly a supporter attached to a kendō face protector.

Background Art

[0002] In kendō, in order to protect competitors from strikes with a bamboo sword, protective gear including a face protector, a torso protector, forearm protectors, and a skirt is worn. The face protector for protecting the head includes a face pad that protects from the top of the head through the temples to the shoulders, a face guard made of lattice-shaped metal that protects the facial part, and a throat guard that protects the throat and neck. Among these, the face pad generally has a structure in which a core material such as cotton is laminated between the front and back cloths, and is a material with a thickness of about 1 cm. The face pad functions to mitigate the impact transmitted to the competitor's head by a strike with a bamboo sword, but it can be said that its performance is not sufficient. For this reason, various proposals have been made for face protectors with improved shock absorption performance. However, in kendō, there is a tendency to value tradition and culture, so it is strongly required that the shape, appearance, etc. do not change from those of conventional face protectors.

[0003] For example, Patent Document 1 discloses the following technique as a method for obtaining a kendō face protector having a shock absorption function, an appearance that does not change from the conventional one, and excellent water absorption and breathability. That is, a fabric is laminated on the front and back surfaces of a core material sandwiching softened raw leather to form a laminate, and the laminate is sewn by stab stitching and formed into a predetermined shape before the softened raw leather dries. Thereafter, the laminate is held in a predetermined shape and the softened raw leather is dried. It is said that a face pad that meets the above conditions can be obtained in such a manner.

[0004] In recent years, in relation to contact sports including kendō, there have been reports that as a result of continuous blows to the head over the years, brain disorders and hearing loss have occurred. For this reason, it is required to further reduce the impact on the head.

Prior Art Documents

Patent Documents

[0005] Patent Document 1 Japanese Patent Application Laid-Open No. 2015-051053 Summary of the Invention Problems to be Solved by the Invention

[0006] An object of the present invention is to reduce impact. Means for Solving the Problems

[0007] According to one aspect of the present invention, a buffer structure includes a plurality of vertical yarn portions made of synthetic resin that extend radially from a central portion to an outer peripheral portion with respect to a reference plane, and a plurality of horizontal yarn portions made of synthetic resin that extend in a circumferential direction so as to connect between the adjacent vertical yarn portions with respect to the reference plane. Each of the vertical yarn portions has an upper vertical yarn portion and a lower vertical yarn portion, and the upper vertical yarn portion and the lower vertical yarn portion are rod-shaped structures provided at a predetermined interval in a direction perpendicular to the reference plane. The horizontal yarn portion is a plate-shaped structure connected to the upper vertical yarn portion and the lower vertical yarn portion of each of the adjacent vertical yarn portions, and has a bent shape in a cross-sectional shape in a direction perpendicular to the reference plane, and has a flat shape that spreads along the reference plane as a whole. Effects of the Invention

[0008] According to the present invention, impact can be reduced. Brief Description of the Drawings

[0009]

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DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment will be described with reference to the drawings. This embodiment relates to a buffer structure. Further, this embodiment relates to a mounting tool for attaching this buffer structure to a face protector for kendo, and a supporter having the buffer structure and the mounting tool. The buffer structure of this embodiment is configured to absorb an instantaneous impact such as a face strike in kendo. Further, the supporter of this embodiment is configured to be easily detachable from the upper outer part of the face protector that receives the face strike. The supporter of this embodiment is configured to effectively reduce the impact on the wearer's head due to the face strike by the buffer structure. This supporter is worn, for example, by a mitori who continuously receives face strikes during kendo practice. By wearing this supporter, it is expected to prevent brain disorders and hearing loss that may occur in a mitori who continuously receives face strikes.

[0011] [Structure of the buffer structure] The structure of the buffer structure 10 according to this embodiment will be described. FIG. 1 shows the structure of the buffer structure 10 according to this embodiment. FIG. 1(a) is a plan view, and FIG. 1(b) is a front view. FIG. 2 shows a cross-sectional view of the buffer structure 10. FIG. 2(a) shows the A-A cross-section shown in FIG. 1(b), and FIG. 2(b) shows the B-B cross-section shown in FIG. 1(a).

[0012] The buffer structure 10 is formed of a synthetic resin having flexibility. The buffer structure 10 is formed of, for example, a silicone resin, a polyurethane resin, various elastomer resins, or the like. The buffer structure 10 has a flat shape as shown in FIG. 1. The planar shape of the buffer structure 10 generally has an outer shape of a regular octagon.

[0013] When considering a reference plane parallel to the paper surface of FIG. 1(a), the planar shape of the buffer structure 10 includes eight vertical yarn portions 30 that radially extend from the central portion 26 to the outer peripheral portion 27, and horizontal yarn portions 40 that extend in the circumferential direction so as to connect the outer peripheral portion 27 and the three adjacent vertical yarn portions 30 between the central portion 26 and the outer peripheral portion 27. Thus, the buffer structure 10 has a spider web-like structure. Each of the four horizontal yarn portions 40 from the outer peripheral portion 27 toward the central portion 26 will be sequentially referred to as the first horizontal yarn portion 41, the second horizontal yarn portion 42, the third horizontal yarn portion 43, and the fourth horizontal yarn portion 44. The buffer structure 10 has a rotationally symmetric shape that is eight-fold symmetric about an axis passing through the central portion 26 and perpendicular to the reference plane. Further, the buffer structure 10 has a plane-symmetric shape with respect to a reference plane passing through the center in the thickness direction, that is, the center in the above-described axial direction.

[0014] Not limited to this, the size of the buffer structure 10 is, for example, about 70 mm - 130 mm for the maximum length and width, and about 100 mm, for example. The thickness of the buffer structure 10 is about 10 mm - 30 mm, and about 15 mm, for example. If it has a size of about 100 mm × 100 mm, it can cover the range of a standard face strike in kendo. Also, in the buffer structure 10 of this embodiment, since four horizontal thread portions 40 are provided from the outer peripheral portion 27 to the central portion 26, the interval between the horizontal thread portions 40 is, for example, about 7 mm - 20 mm, and about 10 mm - 15 mm, for example. Since the diameter of the tip portion of a kendo bamboo sword is 25 mm, if the interval between the horizontal thread portions 40 is within the above range, the tip of the bamboo sword will not bite into the space between the vertical thread portion 30 and the horizontal thread portion 40. Thereby, damage to the buffer structure 10 or the bamboo sword that may occur when the tip of the bamboo sword bites into the space between the vertical thread portion 30 and the horizontal thread portion 40 can be prevented.

[0015] The vertical thread portion 30 includes an upper vertical thread portion 31 which is a rod-shaped structure provided radially from the central portion 26 to the outer peripheral portion 27 along the upper surface 21 of the buffer structure 10, and a lower vertical thread portion 32 which is a rod-shaped structure provided radially from the central portion 26 to the outer peripheral portion 27 along the lower surface 22 of the buffer structure 10. The upper vertical thread portion 31 and the lower vertical thread portion 32 have a certain width. A space 33 is provided between the upper vertical thread portion 31 and the lower vertical thread portion 32. As shown in Fig. 1(b), when the buffer structure 10 is viewed from the front, hexagonal through holes are opened in the buffer structure 10 along the vertical thread portion 30.

[0016] The horizontal thread portion 40 is a plate-like structure provided so as to extend between adjacent vertical thread portions 30 from the upper surface 21 to the lower surface 22 of the buffer structure 10. The portions corresponding to the four corners of each plate-like horizontal thread portion 40 are connected to the upper vertical thread portion 31 or the lower vertical thread portion 32. Both longitudinal ends of the outermost peripheral first horizontal thread portion 41 are connected to the ends of the vertical thread portion 30. The upper surface of the vertical thread portion 30 and the upper surface of the horizontal thread portion 40 form the same plane and form the upper surface 21 of the buffer structure 10. The lower surface of the vertical thread portion 30 and the lower surface of the horizontal thread portion 40 form the same plane and form the lower surface 22 of the buffer structure 10. The central portion of each horizontal thread portion 40 in the thickness direction is located outside the buffer structure 10 with respect to the upper and lower portions. That is, the longitudinal cross-sectional shape in the direction perpendicular to the reference plane of each horizontal thread portion 40 has a bent shape like the Chinese character "く". A hexagonal through-hole 45 is provided in the central portion of the plate-like structure of the innermost peripheral fourth horizontal thread portion 44. Since the fourth horizontal thread portion 44 has a relatively short perimeter and is less likely to be crushed in the vertical direction as described later, it is configured to be easily crushed in the vertical direction by providing the through-hole 45.

[0017] When a force is applied to the buffer structure 10 in the vertical direction, the horizontal thread portion 40, which is the vertical support structure of the buffer structure 10, further bends at the bent portion in the central portion in the vertical direction and deforms so as to be crushed in the vertical direction. The horizontal thread portion 40 functions like a spring in the vertical direction. Since there is no support structure between the upper vertical thread portion 31 and the lower vertical thread portion 32 in the vertical thread portion 30, the distance between the upper vertical thread portion 31 and the lower vertical thread portion 32 is reduced according to the deformation of the horizontal thread portion 40. When an impact is applied to the buffer structure 10 in the vertical direction, the buffer structure 10 absorbs the impact by the above-described deformation and exhibits a buffering function. In the buffer structure 10, the horizontal thread portion 40 has a plate shape bent in the shape of the Chinese character "く", and a space 33 is provided between the upper vertical thread portion 31 and the lower vertical thread portion 32 so that the vertical thread portion 30 is hollowed out at the central portion in the thickness direction. Therefore, high impact absorption performance can be obtained.

[0018] Moreover, by having a spider web-like structure in the shape of a regular octagon, impact dispersion performance can be obtained. For example, the impact on the central part 26 where the impact of face hitting can be the highest is dispersed radially. Also, since the buffer structure 10 has large gaps, it is lightweight. Since the thickness of the buffer structure 10 is about 15 mm, for example, in the case of deformation due to a standard hit in kendo, the upper vertical yarn part 31 and the lower vertical yarn part 32 of the vertical yarn part 30 do not come into contact, and sufficient buffer performance is obtained so that a strong impact is not transmitted to the head.

[0019] In the buffer structure 10 of the present embodiment, the longitudinal cross-sectional shape of the horizontal yarn part 40 has a "く" shape. According to experiments, when compared with the case where the horizontal yarn part 40 has an "I" shape perpendicular to the upper surface 21 and the lower surface 22, the equivalent spring constant of the entire buffer structure 10 having the "く" shaped horizontal yarn part 40 of the present embodiment is 66.7% lower.

[0020] Since the buffer structure 10 has a shape in which the corners of the regular octagon are hollowed out, there are no sharp and hard parts, and even when the buffer structure 10 hits the face or the like, it has a structure in which injuries are less likely to occur.

[0021] Various methods can be used to manufacture the buffer structure 10. For example, the buffer structure 10 may be formed using a 3D printer. Also, the buffer structure 10 has a shape symmetric with respect to a reference plane passing through the center in the thickness direction, and the upper side and the lower side of this plane are formed separately and joined together, whereby the buffer structure 10 may be formed. In this case, each part has a shape that can be manufactured by various methods using, for example, a mold.

[0022] Note that, although an example in which the upper surface 21 and the lower surface 22 of the buffer structure 10 of the present embodiment are formed by parallel planes has been shown, the present invention is not limited to this. For example, the buffer structure may have a shape with different thicknesses depending on the location. For example, the buffer structure may be thicker or thinner at the central portion than at other portions. Further, the buffer structure 10 of the present embodiment is an example in which the number of vertical yarn portions 30 is eight and the general shape is a regular octagon, but the present invention is not limited to this. The number of vertical yarn portions 30 may be more or less. Further, it does not have to have the general shape of a regular polygon. Further, the buffer structure 10 of the present embodiment is an example in which the number of horizontal yarn portions 40 is four, but the present invention is not limited to this. The number of horizontal yarn portions 40 may be more or less.

[0023] [Structure of the supporter] The supporter 100 of the present embodiment will be described. FIG. 3 is a diagram schematically showing an outline of a configuration example of the supporter 100. FIG. 3(a) is a plan view of the supporter 100, and FIG. 3(b) is a front view of the supporter 100. The supporter 100 includes the above-described buffer structure 10. The supporter 100 is configured such that the buffer structure 10 is disposed and fixed on the outer upper portion of the kendo face protector.

[0024] The supporter 100 includes the buffer structure 10 and a fixture 110 configured to be attached to the face protector and support the buffer structure 10. The fixture 110 includes a base material 120 that is, for example, rectangular, thin, and flexible. The base material 120 is formed of, for example, canvas. The length of the base material 120 is, for example, about 300 mm to 450 mm, and is, for example, about 380 mm. The width of the base material 120 is, for example, about 80 mm to 160 mm, and is, for example, about 120 mm. The base material 120 is formed by folding two pieces of No. 11 canvas in half.

[0025] The mounting device 110 has a shape that is line-symmetric with respect to a line perpendicular to the long side assumed to be at the center in the longitudinal direction. In the central portion 122 of the base material 120, a housing portion 130 is provided that is configured to house the buffer structure 10. The housing portion 130 may be formed, for example, between two-folded canvas. The housing portion 130 does not necessarily have to be formed by two-folded cloth, and may be formed, for example, by sewing another cloth. The mounting device 110 may be configured such that the buffer structure 10 can be easily inserted into and removed from the housing portion 130, or the buffer structure 10 may be firmly fixed within the housing portion 130. When the buffer structure 10 is fixed to the mounting device 110, the buffer structure 10 may be fixed to the mounting device 110 with an adhesive or sewn, regardless of the housing portion 130.

[0026] On both side portions 124 on both sides of the central portion 122 of the base material 120, a pair of hook-and-loop fasteners 140 are provided respectively. One of the pair of hook-and-loop fasteners 140 is provided at one corner portion of the side portion 124 which is substantially quadrilateral including a rectangle or a square, and the other of the pair of hook-and-loop fasteners 140 is provided at the diagonal corner portion. One of the hook-and-loop fasteners 140 provided on the side closer to the central portion 122 is referred to as the first hook-and-loop fastener 141, and the other hook-and-loop fastener 140 provided at the corner portion of the base material 120 is referred to as the second hook-and-loop fastener 142. The shapes of the first hook-and-loop fastener 141 and the second hook-and-loop fastener 142 may be right-angled triangles with two sides along two sides of the side portion 124 respectively, as shown in FIG. 3(a), or may be other shapes.

[0027] In each of the side portions 124 of the base material 120, an exposed portion 150 is provided along the diagonal line connecting the two corners where the hook-and-loop fastener 140 is not provided, and the base material 120 is exposed without the hook-and-loop fastener 140. The mounting device 110 is configured such that the first hook-and-loop fastener 141 and the second hook-and-loop fastener 142 are brought together and fastened by folding back the base material 120 at the exposed portion 150.

[0028] Note that the hook-and-loop fastener 140 may be replaced with various fasteners such as various buttons, and a pair of one and the other of the fasteners may be provided at the diagonal portions.

[0029] [Attachment of the supporter to the face protector] A method of attaching the supporter 100 to the face protector 200 will be described with reference to FIG. 4. FIG. 4(a) is a diagram schematically showing the face protector 200 worn by the athlete. The face protector 200 includes a face cloth 210 formed of a single piece of sashiko that protects from the top of the athlete's head through the sides of the head to the shoulders, a face plate 220 formed of a lattice-shaped metal that protects the athlete's facial portion, and a hanging flap and a precautionary flap 230 that protects the athlete's throat and neck. The face plate 220 has an annular base ring 221 that forms the outer peripheral portion, one vertical bar 222 extending vertically fixed above and below the base ring 221, and, for example, 14 horizontal bars 223 extending horizontally. The vertical bar 222 and the horizontal bars 223 have a curved shape following the swelling of the face.

[0030] The face protector 200 worn on the athlete's head is fixed to the athlete's head by, for example, two face strings 242. One end of each face string 242 is attached to, via a face leather 244, the left and right end portions of, for example, the fourth horizontal bar 223 from the bottom of the face plate 220. The face strings 242 are each stretched from the face leather 244 upward and backward of the head, crossed at the back of the head, and stretched upward and forward of the head. These face strings 242 pass under the vertical bar 222 above the uppermost horizontal bar 223, the two face strings 242 are crossed under the vertical bar 222, and are stretched again toward the back of the head along the other face string 242. The two face strings 242 reaching the back of the head are tied at the back of the head.

[0031] As described above, the supporter 100 is attached to the face protector 200 firmly fixed to the head of the athlete as required. Fig. 4(b) is a diagram schematically showing the state during the attachment of the supporter 100 to the face protector 200. The supporter 100 is arranged along the face cushion 210 such that the central portion 122 in which the buffer structure 10 is accommodated is located at the front side of the top of the face cushion 210. At this time, both side portions 124 of the supporter 100 are inserted between the face string 242 stretched between the upper part of the vertical bar 222 at the top of the face plate 220 and the back of the athlete's head and the face cushion 210. At this time, the face string 242 passes through the exposed portion 150 between the first surface fastener 141 and the second surface fastener 142 of the side portion 124 of the supporter 100.

[0032] Fig. 4(c) is a diagram schematically showing the state where the supporter 100 is attached to the face protector 200. From the state shown in Fig. 4(b), both side portions 124 of the supporter 100 are folded back along the face string 242 stretched between the top of the face plate 220 and the back of the athlete's head, and the first surface fastener 141 and the second surface fastener 142 are bonded and fastened. As described above, the supporter 100 can be easily fixed to the face protector 200. Also, in the reverse procedure of the above, the supporter 100 can be easily removed from the face protector 200.

[0033] In this way, the supporter 100 includes the buffer structure 10, the accommodating portion 130 configured to accommodate the buffer structure 10 and be arranged at the top of the head of the kendo face protector 200, the side portions 124 provided on both sides sandwiching the accommodating portion 130 and configured to be inserted between the face string 242 stretched from the upper part of the vertical bar 222 at the time of wearing the face protector 200 to the back of the head and the face cushion 210, and the fasteners such as the surface fastener 140 provided on the side portion 124 and configured to fasten the side portion 124 when folded back so as to straddle the face string 242.

[0034] As shown in FIG. 4(c), the buffer structure 10 of the supporter 100 is disposed on the top of the head of the face protector 200. This position is where the face is struck with a bamboo sword in kendo. In a match, the number of times the face is struck is small, but in practice, it may be struck very many times. In particular, in practices such as driving practice and hanging practice where face strikes are continuously performed, it is remarkable that the instructor or the person standing as a target who receives the strikes is struck very many times. The supporter 100 of the present embodiment is configured such that, for example, only the instructor or the person standing as a target wears it only during such driving practice and hanging practice. As a result, as will be described later, it becomes possible for athletes to practice more safely.

[0035] [Regarding the Supporter] In recent years, it has been noted that in contact sports athletes and the like, repeated impacts to the head over a long period of time can accumulate damage to the brain and cause symptoms such as chronic traumatic encephalopathy. Such accumulation of brain damage may also occur in kendo. Also, it is known that in contact sports athletes and the like, as a result of repeated impacts to the head, some athletes become deaf. Such deafness may be caused by the impact to the head including bone conduction being transmitted to the inner ear and damaging the auditory sensory cells, or by the large sound generated by the strike damaging the auditory sensory cells.

[0036] In such a situation, according to the buffer structure 10 according to the present embodiment and the supporter 100 using the same, the effect of reducing the impact on the head and suppressing the generation of impact sound can be obtained. As a result, it is possible to prevent the occurrence of brain disorders and deafness in kendo athletes.

[0037] In traditional sports such as kendo, due to its cultural background, it is difficult to improve equipment. Also, for example, equipment such as practice-only headgear tends to increase the burden on athletes, is difficult to popularize, and may involve commercial difficulties. In contrast, the buffer structure 10 and the supporter 100 using the same according to the present embodiment are relatively inexpensive and are relatively easy to promote popularization. Also, the supporter 100 can be easily attached to and detached from the traditional headgear 200 as needed. Therefore, there is no conflict with the cultural background. Also, for example, effective injury prevention can be achieved, such as when only the basic stance is worn during driving practice.

[0038] The supporter 100 of the present embodiment is an example that is made suitable for attachment to the headgear 200 by the attachment tool 110. However, the buffer structure 10 can be used not only for kendo but also for various sports competitions in which repeated impacts are applied to the head, such as boxing, karate, American football, and soccer with heading. In this case, by using an attachment tool suitable for the characteristics of each sport, a supporter suitable for the buffer structure 10 to function can be constructed.

[0039] [Experimental Example] The impact reduction performance of the buffer structure 10 according to the above-described embodiment was evaluated by experiments.

[0040] 〈Experimental Method〉 FIG. 5 is a diagram schematically showing the configuration of an experimental apparatus 300 used in this experiment. The experimental apparatus 300 has a plaster head model 310. An acceleration sensor 322 is installed at the top of the head of the head model 310. The acceleration sensor 322 is connected to an acoustic vibration analysis system 332 (manufactured by Ono Sokki, DS-5100) connected to a computer 334. The data acquired by the acceleration sensor 322 was analyzed using the acoustic vibration analysis system 332 and the computer 334.

[0041] The face protector 200 was put on the head model 310 where the acceleration sensor 322 was arranged. At the top of the head outside the face protector 200, the honeycomb-shaped buffer structure 10 according to this embodiment was arranged and fixed. The buffer structure 10 was formed using a 3D printer. The buffer structure 10 was produced using a polyurethane resin. The size of the buffer structure 10 was 100 mm in both length and width, and the thickness was 15 mm. A photograph of the produced buffer structure 10 is shown in FIG. 6.

[0042] For the impact, a small bamboo sword striking device 340 was used. The small bamboo sword striking device 340 includes a small bamboo sword 342 and a swinging-down mechanism 344. The swinging-down mechanism 344 is configured to swing down the small bamboo sword 342 by 90° from the vertically upward direction to the horizontal. The position of the small bamboo sword striking device 340 was adjusted so that the tip of the swung-down small bamboo sword 342 strikes the top of the head portion of the face protector 200 where the buffer structure 10 is arranged.

[0043] In the experiment, in addition to the case where the honeycomb-shaped buffer structure 10 of this embodiment was arranged on the top of the head of the face protector 200, for comparison, an experiment was also conducted with only the face protector 200 without arranging the buffer structure 10 and with other conditions being the same. Also, instead of the honeycomb-shaped buffer structure 10 of this embodiment, an experiment was conducted in which a buffer structure 90 having a honeycomb structure according to a comparative example as shown in FIG. 7 was arranged on the top of the head of the face protector 200. This buffer structure 90 having a honeycomb structure has a shape in which hexagonal columns are hollowed out at regular intervals in two directions perpendicular to each other in the vertical and horizontal directions parallel to the main surface from a flat base material. The thickness of the buffer structure 90 having a honeycomb structure was set to 15 mm, the same as that of the honeycomb-shaped buffer structure 10. The experiment was conducted with other conditions being the same except for the structure of the buffer structure. The measurement was performed 5 times each.

[0044] 〈Experimental Results〉 When striking using the small bamboo sword striking device 340, the results of the impact acceleration measured using the acceleration sensor 322 are shown in FIG. 8. The impact acceleration, when using the honeycomb-type buffer structure 10 according to the present embodiment, was 27% of that in the case of only the face protector 200 without using it. That is, an impact reduction effect of 73% was obtained. By using the honeycomb-type buffer structure 10 according to the present embodiment, the impact acceleration becomes less than 30% of that in the case of only the face protector 200 without using it, and it has been clarified that the damage to the head caused by the strike is significantly reduced. The impact acceleration, when using the buffer structure of the honeycomb structure according to the comparative example, was 48% of that in the case of only the face protector 200 without using it. That is, an impact reduction effect of 52% was obtained. Thus, by using the buffer structure of the honeycomb structure according to the comparative example, the impact acceleration became less than 50% of that in the case of only the face protector 200 without using it, but it has been clarified that the damage reduction effect is greater when using the honeycomb-type buffer structure 10 according to the present embodiment. By significantly reducing the damage to the head caused by the strike, prevention of brain disorders such as chronic traumatic encephalopathy and auditory disorders such as hearing loss is expected.

[0045] As described above, the present invention has been described by showing preferred embodiments. However, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

Explanation of Signs

[0046] 10: Buffer structure 21: Upper surface, 22: Lower surface, 26: Central portion, 27: Outer peripheral portion 30: Vertical thread portion, 31: Upper vertical thread portion, 32: Lower vertical thread portion, 33: Space 40: Horizontal thread portion, 41: First horizontal thread portion, 42: Second horizontal thread portion, 43: Third horizontal thread portion, 44: Fourth horizontal thread portion, 45: Through hole 100: Supporter 110: Fitting, 120: Base material, 122: Central portion, 124: Side portion, 130: Accommodating portion, 140: Surface fastener, 141: First surface fastener, 142: Second surface fastener, 150: Exposed portion 200: Facial protective gear 210: Facial futon, 220: Facial metal, 221: Base wheel, 222: Vertical metal, 223: Horizontal metal, 230: Protruding curtain and precautionary curtain, 242: Facial string, 244: Facial leather for breast 300: Experimental device 310: Head model, 322: Acceleration sensor, 332: Acoustic vibration analysis system, 334: Computer, 340: Small shinai striking device, 342: Small shinai, 344: Swing-down mechanism

Claims

1. A plurality of vertical yarn portions made of synthetic resin extending radially from a central portion to an outer peripheral portion with respect to a reference plane, and a plurality of horizontal yarn portions made of synthetic resin extending in a circumferential direction so as to connect between the adjacent vertical yarn portions with respect to the reference plane are provided, each of the vertical yarn portions has an upper vertical yarn portion and a lower vertical yarn portion, and the upper vertical yarn portion and the lower vertical yarn portion are rod-shaped structures provided at a predetermined interval in a direction perpendicular to the reference plane, the horizontal yarn portion is a plate-shaped structure connected to the upper vertical yarn portion and the lower vertical yarn portion of each of the adjacent vertical yarn portions, and has a bent shape in a cross-sectional shape in a direction perpendicular to the reference plane, and has a flat shape extending along the reference plane as a whole, a buffer structure.

2. The interval between adjacent horizontal yarn portions is less than 25 mm, the size along the reference plane is 70 mm - 130 mm at the maximum portion, and the thickness in a direction perpendicular to the reference plane is 10 mm - 30 mm, The buffer structure according to Claim 1.

3. The buffer structure according to Claim 1 or 2, having a symmetric shape with respect to the reference plane passing through the center in the thickness direction.

4. The number of the vertical yarn portions is eight, and the number of the horizontal yarn portions is four from the outer peripheral portion to the central portion, The buffer structure according to Claim 1 or 2.

5. The buffer structure according to Claim 1, and a wearing tool having a flat shape are provided, the wearing tool has a housing portion configured to house the buffer structure and be disposed at the top of the head of the face protector for kendo, side portions provided on both sides sandwiching the housing portion and configured to be inserted between a face string and a face cushion that are passed from the upper part of the vertical gold to the back of the head when the face protector is worn, and a fastener provided on the side portion and configured to fasten the side portion when folded back so as to straddle the face string and has, a supporter.

6. Each of the side portions is substantially quadrilateral, and a pair of one and the other of the fasteners are provided at diagonal portions of the substantially quadrilateral, The supporter according to Claim 5.

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