Head mounting fixture and method for evaluating its shock absorption performance

Abstract

To provide a head mounting fixture equipped with a shock absorbing member suitable for a head mounting fixture worn when playing sports, and a method for evaluating its shock absorption performance.SOLUTION: A head mounting fixture 1 includes a head mount main body 2 that is mounted on a head, and a shock absorbing member 3 provided on the head mount main body 2, in which a ratio of an amount of impact input to the head via the shock absorbing member during playing soccer to an amount of impact input to the head without passing through the shock absorbing member during playing soccer, is set at 57% or less, and a bending recovery property of the shock absorbing member is set to 29 gf.cm / cm or less.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a headgear and a method for evaluating its shock absorption performance.

Background Art

[0002] Generally, when playing sports, the head may be impacted by contact between players, falling, etc. For example, Non-Patent Document 1 discloses the need to mitigate impacts on the head caused by heading during soccer, especially in the growth years (infancy to U-15), impacts on the head due to competition during heading, and impacts on the head caused by collisions between heads or between the head and the elbow or the ground. On the other hand, in the football cap as a headgear disclosed in Patent Document 1, an impact buffering member (shock absorption member) for absorbing the impact on the forehead where the ball contacts during heading is arranged when playing sports such as soccer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Since the shock-absorbing member disclosed in Patent Document 1 is a highly water-absorbent sheet for cooling the forehead, Patent Document 1 does not disclose performance such as the shock absorption rate by the shock-absorbing member. Further, there are no regulations regarding criteria such as what shock absorption performance should be provided in a headgear corresponding to Non-Patent Document 1 and a measurement method therefor.

[0006] For example, the shock absorption performance may be evaluated by a coefficient of restitution (so-called GB coefficient) that correlates with shock absorption. In contrast, since the applicant of the present application believes that the coefficient of restitution evaluates the resilience, it is difficult to determine whether the suppression of the impact on the head is achieved by evaluating only the coefficient of restitution, and it is considered that it may be different from the amount of impact that can actually be input to the player's head. The applicant of the present application has found a new problem that since the amount of shock absorption may also change depending on other factors in addition to the coefficient of restitution, it is necessary to directly evaluate the amount of impact input to the head. Further, the applicant of the present application has found a new problem that there may be a sense of discomfort during wearing due to the configuration for reducing the amount of impact, and there is room for improvement in terms of wearing comfort.

[0007] The present invention provides a headgear provided with a shock-absorbing member suitable for a headgear worn when playing soccer and a method for evaluating the shock absorption performance thereof in order to solve at least one of the above new problems.

Means for Solving the Problems

[0008] One aspect of the present invention is a headgear main body worn on the head, and a shock-absorbing member provided on the headgear main body, and is configured such that the ratio of the second impact amount that can be input to the head via the shock-absorbing member during a soccer play to the first impact amount that can be input to the head without passing through the shock-absorbing member during a soccer play is 57% or less, and provides a headgear in which the bending resilience of the shock-absorbing member is set to 29 gf·cm / cm or less.

[0009] As the impact amount, impact force or impact acceleration may be used. In this specification, the impact force is defined as the value obtained by multiplying the G value of the impact acceleration by the mass (kg) of the object colliding therewith. Further, as the impact amount, a Head Injury Criterion value (HIC value), which is a numerical value representing the degree of damage to the brain and skull due to an impact, may be used.

[0010] The measurement of the bending recovery property is measured by a method widely known as the KES method, i.e., the Kawabata Evaluation System (objective measurement method for fabric texture). Details are described in "Standardization and Analysis of Texture Evaluation (2nd Edition)" by Yoshio Kawabata, published by the Japan Society of Fiber Science and Technology (1980). Specifically, it was measured using a pure bending tester KES-FB2 (manufactured by Kato Tech Co., Ltd.). For the bending recovery property 2HB, the smaller the value, the better the impact absorbing member recovers from bending deformation, which means that the impact absorbing member has an elastic feeling. In other words, for the bending recovery property 2HB, the smaller the value, the easier it is for the impact absorbing member to recover from the bent state to the original state.

[0011] According to the present invention, since the degree of reduction of the impact amount input to the head is appropriately set, for example, when the head contacts the ground during a fall, when the heads of players contact each other, when the head contacts the elbow, or when the ball abuts against the head during heading, the impact on the head can be absorbed. If the ratio of the second impact amount input to the head via the impact absorbing member to the first impact amount that can be assumed to be input to the head without passing through the impact absorbing member exceeds 57%, the impact absorption for the head is likely to be insufficient.

[0012] Generally, when trying to increase the impact absorption amount, it is conceivable to increase the deformation amount (stroke amount) of the impact absorbing member at the time of collision. However, when increasing the stroke amount of the impact absorbing member, the thickness of the impact absorbing member increases, which is not preferable because it leads to a sense of discomfort when worn as a sports headband. On the other hand, by setting the bending recovery property to 29 gf·cm / cm or less, the impact absorbency can be improved without increasing the thickness of the impact absorbing member.

[0013] More specifically, by appropriately setting the bending resilience, it is estimated that while the shock-absorbing member absorbs the impact force by deforming, the resilience due to the bending resilience that resists the deformation of the shock-absorbing member can further absorb the amount of impact. In other words, when the deformation amount of the shock-absorbing member is the same, it can be assumed that the amount of impact force absorbed by the deformation of the shock-absorbing member can be increased compared to the case where the resilience exceeds 29 gf·cm / cm. Therefore, without increasing the thickness of the shock-absorbing member, the amount of impact force absorbed can be increased, and the impact force transmitted to the head after the shock-absorbing member is crushed and deformed is likely to be alleviated.

[0014] For example, when the bending resilience exceeds 29 gf·cm / cm, the shock-absorbing member can absorb the impact force by deforming. However, it is estimated that the resilience due to the bending resilience for resisting deformation is insufficient compared to the case where the bending resilience is 29 gf·cm / cm or less. Therefore, the impact force transmitted to the head after the shock-absorbing member is crushed and deformed is not easily alleviated sufficiently.

[0015] Another aspect of the present invention is a head-mounted device main body worn on the head, and a shock-absorbing member provided on the head-mounted device main body, wherein the coefficient of restitution of the shock-absorbing member is set to 34% or less, and the bending resilience of the shock-absorbing member is set to 29 gf·cm / cm or less, to provide a head-mounted device.

[0016] In the present invention, the GB coefficient is used as the coefficient of restitution. The GB coefficient means that a golf ball (manufactured by Bridgestone: product name NewBreed) is freely dropped from a height of 100 cm onto the upper surface of the shock-absorbing member placed on a concrete floor. At this time, the height to which the golf ball rebounds is measured, and the GB coefficient is calculated. GB coefficient (%) = {rebound height (cm) / 100 (cm)} × 100.

[0017] According to this configuration, since the resilience coefficient and the bending recovery property of the shock-absorbing member are appropriately set, for example, when the head contacts the ground during a fall, when the heads of players contact each other, when the head contacts the elbow, or when the ball abuts against the head during a header, the shock to the head can be absorbed. If the resilience coefficient exceeds 34%, the shock absorption for the head tends to be insufficient. On the other hand, even if the resilience coefficient is 34% or less, the shock absorption for the head may be insufficient in some cases.

[0018] On the contrary, by appropriately setting the bending recovery property, it is presumed that while the shock-absorbing member absorbs the impact force by deforming, the shock-absorbing member can further absorb the impact amount by the restoring force due to the bending recovery property that resists the deformation of the shock-absorbing member. In other words, when the deformation amount of the shock-absorbing member is the same, it can be assumed that the absorption amount of the impact force caused by the deformation of the shock-absorbing member can be increased compared to the case where the restoring force exceeds 29 gf·cm / cm. Therefore, by increasing the absorption amount of the impact force, the impact force transmitted to the head after the crushing deformation of the shock-absorbing member is likely to be alleviated.

[0019] For example, when the bending recovery property exceeds 29 gf·cm / cm, the shock-absorbing member can absorb the impact force by deforming. However, compared with the case where the bending recovery property is 29 gf·cm / cm or less, it is presumed that the restoring force due to the bending recovery property for resisting deformation is insufficient. Therefore, the impact force transmitted to the head after the crushing deformation of the shock-absorbing member is not easily alleviated sufficiently.

[0020] The bending rigidity of the shock-absorbing member may be set to 48.4 gf·cm 2 / cm or less.

[0021] The measurement of the bending rigidity is the same as that of the bending recovery property, and is measured by the KES method.

[0022] According to this configuration, since the bending rigidity of the shock-absorbing member is appropriately set, even when the shock-absorbing member is disposed on the headgear, it is possible to avoid inhibiting the wearing comfort of the headgear and sewing is possible. Specifically, when the bending rigidity exceeds 48.4 gf·cm 2 / cm, the bending rigidity of the portion where the shock-absorbing member is disposed becomes excessive, making it difficult to conform to the shape in the circumferential direction of the head. Furthermore, in the portion where the shock-absorbing member is disposed and the bending rigidity becomes excessive, displacement is likely to occur because it does not follow the head.

[0023] Also, when the bending rigidity of the shock-absorbing member exceeds 48.4 gf·cm 2 / cm, for example, when the headgear is a cap and the shock-absorbing member is disposed along the circumferential direction of the head, it is difficult to sew the shock-absorbing member along the circumferential direction of the head of the cap.

[0024] The resilience coefficient of the shock-absorbing member may be set to 12% or more.

[0025] According to this configuration, for example, it is possible to obtain a repulsive force for rebounding the ball while absorbing the impact on the head during heading. When the resilience coefficient is less than 12%, for example, the repulsive force for rebounding the ball during heading is insufficient.

[0026] More specifically, generally, when the resilience coefficient is small, the shock absorption rate improves, so when the rebound rate decreases, a sense of discomfort may occur due to insufficient ball rebound during heading or the like. In contrast, the inventor of the present application has obtained a new finding that even when the resilience coefficient is 12%, a repulsive force for rebounding the ball that does not cause discomfort during heading can be obtained. Therefore, since the upper and lower limit values of the resilience coefficient of the shock-absorbing member described above are set based on this new finding, it is possible to have a shock-absorbing property that does not cause discomfort during heading while enhancing the shock absorption during heading. As a result, it is possible to provide a headgear provided with a shock-absorbing member suitable for a headgear worn when performing sports.

[0027] The thickness of the shock-absorbing member may be set to be 3 mm or more and 5 mm or less.

[0028] According to this configuration, since the thickness of the shock-absorbing member is appropriately set, both shock absorption and a comfortable fit can be achieved. Specifically, when it is less than 3 mm, shock absorption is insufficient, and when it exceeds 5 mm, a sense of discomfort may occur when wearing the headgear, and the aesthetics may be impaired, and it is difficult to sew along the head circumference of the headgear such as a cap.

[0029] The headgear main body has a rear covering portion corresponding to the frontal region of the wearer. The shock-absorbing member may be disposed at least in a part of the rear covering portion.

[0030] According to this configuration, since the shock-absorbing member is provided at a position corresponding to the frontal region, for example, the impact load input to the head by heading or the like can be reduced.

[0031] The headgear main body has a front covering portion corresponding to the occipital region of the wearer. The shock-absorbing member may be disposed at least in a part of the front covering portion.

[0032] According to this configuration, since the shock-absorbing member is provided at a position corresponding to the occipital region, for example, the impact load input to the head at the time of contact and fall can be reduced.

[0033] The headgear main body has a pair of side covering portions corresponding to a pair of temporal regions of the wearer. The shock-absorbing member may be disposed at least in a part of the pair of side covering portions.

[0034] According to this configuration, since the shock-absorbing member is provided at a position corresponding to the temporal region, for example, when contact occurs between the heads of players during play, the impact load input to the temples and temporal region can be reduced.

[0035] The head-mounted device body has an upper covering portion corresponding to the top region of the wearer's head. The shock-absorbing member may be disposed at least in part of the upper covering portion.

[0036] According to this configuration, since the shock-absorbing member is provided at a position corresponding to the top region of the head, for example, the impact load input to the head due to falling, heading, etc. can be reduced.

[0037] The head-mounted device is a cap.

[0038] According to this configuration, the effects of the present invention can be obtained.

[0039] The head-mounted device is a headband.

[0040] According to this configuration, the effects of the present invention can be obtained.

[0041] A method for evaluating the shock-absorbing performance input to the head via the head-mounted device, The head mannequin for evaluating the shock-absorbing performance includes a shock amount sensor for measuring the amount of shock input to the head mannequin. The head-mounted device is mounted along the circumferential direction from at least the forehead to the back of the head of the head mannequin. By means of an impact force input means, the largest first shock amount assumed to be input to the head during a soccer play is input to the head mannequin with the head-mounted device mounted thereon and the head mannequin without the device mounted. Measure the second shock amount that can be input to the head via the head-mounted device during a soccer play. A method for evaluating the shock-absorbing performance of the head-mounted device is provided as the ratio of the second shock amount to the first shock amount.

[0042] According to this configuration, the shock-absorbing performance of the head-mounted device can be evaluated.

[0043] When the ratio is 57% or less, The headgear may be determined to satisfy a predetermined shock absorption performance.

[0044] According to this configuration, since the shock absorption performance of the headgear is appropriately set, the amount of shock input to the wearer can be reduced. If the ratio of the second shock amount to the first shock amount exceeds 57%, shock absorption for the head is likely to be insufficient.

[0045] The shock amount sensor may measure shock acceleration.

[0046] According to this configuration, by measuring the shock acceleration related to the shock amount, the shock absorption performance can be evaluated.

[0047] When the shock acceleration input to the head through the shock absorption member is 199 m / s 2 or less, the headgear may be determined to satisfy the shock absorption performance.

[0048] According to this configuration, since the shock acceleration input to the head mannequin is appropriately set, the amount of shock input to the wearer can be reduced. When the shock acceleration input to the head through the shock absorption member exceeds 199 m / s 2 shock absorption for the head is likely to be insufficient.

[0049] The shock force input means may be configured to cause a pendulum type impactor to collide with the stationary head mannequin.

[0050] According to this configuration, by adjusting the mass of the impactor and the pendulum angle of the impactor, the amount of shock input to the head mannequin can be set to a desired value.

[0051] The shock force input means may be configured to input a shock force to the head mannequin by freely dropping the head mannequin from a predetermined drop height.

[0052] According to this configuration, by adjusting the dropping height of the head mannequin, the amount of impact input to the head mannequin can be set to a desired value.

Advantages of the Invention

[0053] It is possible to provide a headgear equipped with a shock-absorbing member suitable for a headgear worn when playing soccer according to the present invention, and a method for evaluating the shock-absorbing performance thereof.

Brief Description of the Drawings

[0054]

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Mode for Carrying Out the Invention

[0055] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0056] [First Embodiment] FIG. 1 is a side view of a cap as a headgear according to an embodiment of the present invention. In FIG. 1, a cap 1 and each region of the wearer's head are shown. Referring to FIG. 1, as the headgear 1, a football cap (hereinafter, also referred to as a "cap") 1 that is worn on the head when playing sports such as soccer will be described as an example.

[0057] The cap 1 includes a cap body (head mounting tool body) 2 to be mounted on the head, and a shock absorbing member 3 provided on the cap body 2.

[0058] The cap body 2 has a crown portion 21 that is substantially hemispherical and covers the head, and a flange portion 22 that extends outward from a part of the circumferential direction of the lower edge portion of the crown portion 21. In the present embodiment, the cap 1 is mounted with the flange portion 22 disposed on the rear head side in consideration of the ease of heading when playing soccer. However, the side on which the flange portion 22 is provided will be described as the front side, and the side opposite to the flange portion 22 (front side) will be described as the rear side. The flange portion 22 has a core material and a surface material that wraps around the core material. The flange portion 22 is stitched at the lower edge portion of the crown portion 21 in a state where the core material and the surface material are overlapped.

[0059] The crown portion 21 has a rear covering portion 21a, a front covering portion 21b, a side covering portion 21c, and an upper covering portion 21d. FIG. 2 is a plan view showing each region of the cap 1 and the head H of the wearer. Referring also to FIG. 2, the rear covering portion 21a covers the frontal region H1 corresponding to the frontal part of the wearer's head. The front covering portion 21b covers the occipital region H2 corresponding to the occipital part of the wearer's head. The side covering portions 21c cover the bilateral temporal regions H3 corresponding to both sides of the wearer's head. The upper covering portion 21d covers the vertex region H4 corresponding to the vertex of the head.

[0060] FIG. 3 is a longitudinal sectional view of the cap 1 in the front-rear direction along the line III-III in FIG. 2. Referring to FIG. 3, the shock absorbing member 3 is disposed inside the crown portion 21 (on the head side). The shock absorbing member 3 is sewn to the surface material 2a that constitutes the outer diameter of the crown portion 21. The shock absorbing member 3 has a first shock absorbing member 4 and a second shock absorbing member 5.

[0061] FIG. 4 is a front perspective view of the shock absorbing member 3, and FIG. 5 is a rear view of the shock absorbing member 3. Referring to FIGS. 4 and 5 together, the first shock absorbing member 4 extends in the circumferential direction (head circumference direction) along the peripheral edge portion on the lower end side of the crown portion 21 and is disposed substantially over the entire circumference. The second shock absorbing member 5 is disposed above the first shock absorbing member 4 and extends in the front-rear direction.

[0062] The first shock-absorbing member 4 includes a rear shock-absorbing portion 41 provided in the rear covering portion 21a (see FIG. 1), a front shock-absorbing portion 42 provided in the front covering portion 21b (see FIG. 1), and a side shock-absorbing portion 43 provided in the side covering portion 21c (see FIG. 1).

[0063] As shown in FIG. 3, since the rear shock-absorbing portion 41 is provided in the rear covering portion 21a, it is arranged corresponding to the wearer's forehead. Since the front shock-absorbing portion 42 is provided in the front covering portion 21b, it is arranged corresponding to the wearer's occipital head. Since the side shock-absorbing portion 43 is provided in the side covering portion 21c, it is arranged corresponding to the wearer's temporal head.

[0064] As shown in FIG. 5, in a rear view, the upper rear edge portion 41a of the rear shock-absorbing portion 41 has a gently mountain-shaped form, and the lower rear edge portion 41b is a uniform straight line extending along the lower edge portion of the crown portion 21.

[0065] As shown in FIG. 5, the upper front edge portion 42a of the front shock-absorbing portion 42 has a mountain-shaped form that rises more steeply than the upper rear edge portion 41a in a rear view. The lower front edge portion 42b is a uniform straight line extending along the lower edge portion of the crown portion 21.

[0066] As shown in FIGS. 4 and 5, the side shock-absorbing portion 43 is integrally formed so as to be continuous with both side portions 42c of the front shock-absorbing portion 42 between both side portions 41c of the rear shock-absorbing portion 41 and both side portions 42c of the front shock-absorbing portion 42. The upper side edge portion 43a is continuous with the upper front edge portion 42a, and the lower side edge portion 43b is continuous with the lower front edge portion 42b.

[0067] Referring to FIG. 5, the rear end portion 43c of each side impact absorbing portion 43 extends to the vicinity of the side portion 41c of the rear impact absorbing portion 41. A gap 45 is provided between the rear end portion 43c and the side portion 41c. Due to this gap 45, between the rear covering portion 21a and the side covering portion 21c, without arranging the impact absorbing member 3, an adjuster portion for changing the perimeter (head circumference) of the crown portion 21 by the adjuster 25 (see FIG. 1) provided across the rear covering portion 21a and the side covering portion 21c is formed. The adjuster 25 is constituted by, for example, a hook-and-loop fastener. The adjuster 25 may be constituted by a slider or the like.

[0068] As shown in FIGS. 3, 4, and 5, the second impact absorbing member 5 is provided on the upper covering portion 21d. Thereby, the second impact absorbing member 5 is arranged corresponding to the top of the head. Referring to FIG. 2, the second impact absorbing member 5 is a strip-shaped member having a predetermined width W1 and extending generally in the front-rear direction in plan view. Both side edges 5a in the width direction of the second impact absorbing member 5 extend linearly in the front-rear direction. The rear edge portion 52 of the second impact absorbing member 5 is sewn to the rear upper edge portion 41a, and the front edge portion 53 of the second impact absorbing member 5 is sewn to the front upper edge portion 42a.

[0069] In the present embodiment, the width W1 of the second impact absorbing member 5 is set to approximately 1 / 3 of the width W of the crown portion 21, for example. Outside the width direction of the second impact absorbing member 5, a region where no impact absorbing member is provided and having substantially the same width direction dimension as the second impact absorbing member 5 is formed. Thereby, compared with the case where the entire upper covering portion 21d is covered by the impact absorbing member 3, the air permeability of the crown portion 21 can be improved.

[0070] Referring to FIG. 3, the shock-absorbing member 3 is composed of, for example, a sheet body 3a made of ethylene-vinyl acetate copolymer resin (EVA) or the like, a surface fabric 3b covering the surface of the sheet body 3a, and a back fabric 3c covering the back surface. The sheet body 3a may be composed of, for example, a closed-cell polyethylene foam product name: Semperca C-700 manufactured by Sanwa Chemical Co., Ltd., a high-performance urethane foam product name: PORON manufactured by Rogers Inoaak Co., Ltd., or a low-rebound soft foam product name: Trans Yellow manufactured by Daiichi Chemical Co., Ltd. In particular, when a styrene-based elastomer (for example, Trans Yellow) is adopted for the sheet body 3a, it is less likely to deteriorate over time than urethane or the like that has low resistance to sweat and water. In addition, since the styrene-based elastomer has the same level of weather resistance as EVA and PE foams, it is also suitable for intense sports outdoors. In the cap 1, from the viewpoint of ease of sewing, it is preferable to adopt EVA, which has higher rigidity than the styrene-based elastomer, for the sheet body 3a. More specifically, EVA has higher rigidity than the styrene-based elastomer. For example, in the part where the sheet body 3a is sewn together like a cap (more specifically, the rear upper edge part 41a and the rear edge part 52 that are sewn together, and the front upper edge part 42a and the front edge part 53), sewing is easier.

[0071] The thickness T1 of the sheet body 3a is, for example, 3 mm or more and 5 mm or less. In the present embodiment, the surface fabric 3b of the shock-absorbing member 3 is constituted by the surface fabric 2a that constitutes the crown part 21. That is, the shock-absorbing member 3 is sewn to the surface fabric 2a in a state where the sheet body 3a and the back fabric 3c are overlapped, and has a three-layer structure.

[0072] The headgear 1 is configured such that the ratio of the second impact amount that can be input to the head through the shock-absorbing member 3 during a soccer play to the first impact amount that can be input to the head without passing through the shock-absorbing member 3 during a soccer play is 57% or less. The method for evaluating the impact amount input to the head and the upper limit value will be described in detail in the evaluation test. In this embodiment, since the impact amount is a value related to the impact force input to the head, the impact force may be used as the impact amount. Also, in this specification, since the impact force is a value obtained by multiplying the G value of the impact acceleration by the mass (kg) of the object that collides, as the impact amount, the impact acceleration (hereinafter, also referred to as "head acceleration") (m / s 2 ) is used. Further, as the impact amount, the head injury criterion value (HIC value), which is a numerical value representing the degree of damage to the brain and skull due to an impact, may be used. The HIC value is a numerical value established by the US NHTSA (National Highway Traffic Safety Administration) and represents the degree of damage to the brain and skull due to impacts such as collisions and falls. It is also used for evaluating the safety of vehicle occupants during a collision and as a head protection criterion value for playgrounds when a child falls from a play equipment. The HIC value is defined by the following mathematical formula using the time change of acceleration. Here, a(t) is the resultant head acceleration (measured at the head center of gravity position) expressed in terms of the gravitational acceleration g, and t1 and t2 are the initial time and the final time (s) in the time interval when the HIC value takes the maximum value.

[0073]

Equation

[0074] The coefficient of restitution (GB coefficient), which is an evaluation test of the shock-absorbing property of the shock-absorbing member 3, is set to be 12% or more and 34% or less. The method for setting the upper and lower limit values of the coefficient of restitution will be described in detail in the examples.

[0075] The method for measuring the coefficient of restitution is to freely drop a golf ball (manufactured by Bridgestone: product name NewBreed) from a height of 100 cm onto the upper surface of the shock-absorbing member placed on the concrete floor, measure the height to which the golf ball rebounds at this time, and calculate the GB coefficient. GB coefficient (%) = {rebound height (cm) / 100 (cm)} × 100.

[0076] The bending recoverability of the shock-absorbing member 3 is set to 29 gf·cm / cm or less. The method for setting the upper limit value of the bending recoverability and the method for measuring the bending recoverability will be described in detail in the examples.

[0077] The measurement of the bending stiffness and the bending recoverability was performed by a method widely known as the KES method, namely the Kawabata Evaluation System (objective measurement method for fabric texture), and the details are described in "Standardization and Analysis of Texture Evaluation (2nd Edition)" by Yoshio Kawabata, published by the Japan Society of Fiber Engineers (1980). Specifically, it was measured using a pure bending tester KES-FB2 (manufactured by Kato Tech Co., Ltd.).

[0078] The bending stiffness of the shock-absorbing member 3 is 48.4 gf·cm 2 / cm or less. The method for setting the upper limit value of the bending stiffness and the method for measuring the bending stiffness will be described in detail in the examples.

[0079] As shown in FIG. 3, in this embodiment, it is also preferable to provide a bin skin 26 on the cap 1. The bin skin 26 is provided so as to extend in the circumferential direction inside the cap 1. When the bin skin 26 is provided so as to extend in the circumferential direction of the crown portion 21, the bin skin 26 may be provided with a width of about 10 mm to 40 mm. By providing the bin skin 26, it is possible to prevent sweat from dripping onto the face and to prevent sweat stains from occurring at the edge of the crown portion 21. The material of the bin skin 26 is not particularly limited, but it is preferable to select a material having better water absorption and quick-drying properties than the anti-slip material 27 described later.

[0080] As shown in FIG. 3, in the present embodiment, it is preferable to provide an anti-slip material 27 on the cap 1. The mounting position of the anti-slip material 27 is not particularly limited as long as it is provided inside the cap 1, and it may be provided on the entire inner surface of the crown portion 21, or may be provided on a part of the inner surface of the crown portion 21. However, it is preferably provided so as to extend in the circumferential direction of the crown portion 21. When the anti-slip material 27 is provided so as to extend in the circumferential direction of the cap 1, the anti-slip material 27 may be provided with a width of about 5 mm to 30 mm.

[0081] Also, as shown in FIG. 3, it is also preferable to provide a bottle skin 26 on the inner circumference of the cap 1 and provide the anti-slip material 27 along the inside of the bottle skin 26. If the anti-slip material 27 is provided on the cap 1 in this way, even if the wearer makes violent movements, it is difficult for the cap 1 to shift or come off. In addition, by arranging the bottle skin 26 together, it is possible to prevent sweat from dripping onto the face and prevent sweat from seeping into the fabric of the crown portion 21. Further, when the bottle skin 26 and the anti-slip material 27 are provided so as to extend in the circumferential direction of the cap 1 as in the embodiment of FIG. 3, it is preferable that the anti-slip material 27 has a smaller width than the bottle skin 26.

[0082] According to the football cap 1 according to the present embodiment, the following effects can be obtained.

[0083] (1) Since the amount of impact input to the head is appropriately set, for example, when the head contacts the ground during a fall, when the heads of players contact each other, when the head contacts the elbow, or when the ball contacts the head during a header, it is possible to absorb the impact on the head. If the ratio of the second impact amount to the first impact amount that can be input to the head exceeds 57%, the impact absorption for the head is likely to be insufficient.

[0084] Generally, when attempting to increase the amount of impact absorption, it is conceivable to increase the amount of deformation (stroke amount) of the impact absorption member during a collision. However, when increasing the stroke amount of the impact absorption member, the thickness of the impact absorption member increases, which is not preferable as a headband for sports because it leads to a sense of discomfort when worn. On the other hand, by setting the bending recovery property to 29 gf·cm / cm or less, it is possible to improve the impact absorption property without increasing the thickness of the impact absorption member.

[0085] More specifically, by appropriately setting the bending recovery property, it is presumed that the impact absorption member can absorb the impact force by deforming and, due to the restoring force caused by the bending recovery property that resists the deformation of the impact absorption member, further absorb the amount of impact. In other words, when the amount of deformation of the impact absorption member is the same, it can be assumed that the amount of impact force absorbed by the deformation of the impact absorption member can be increased compared to the case where the restoring force exceeds 29 gf·cm / cm. Therefore, without increasing the thickness of the impact absorption member, the amount of impact force absorbed can be increased, and the impact force transmitted to the head after the crushing deformation of the impact absorption member is likely to be alleviated.

[0086] For example, when the bending recovery property exceeds 29 gf·cm / cm, the impact absorption member can absorb the impact force by deforming. However, it is presumed that the restoring force due to the bending recovery property for resisting deformation is insufficient compared to the case where the bending recovery property is 29 gf·cm / cm or less. Therefore, the impact force transmitted to the head after the crushing deformation of the impact absorption member is not easily alleviated sufficiently.

[0087] (2) Since the coefficient of restitution of the impact absorption member 3 is set to 34% or less, for example, when a ball contacts the head during heading or when contact occurs between the heads of players, it can absorb the impact on the head. If the coefficient of restitution exceeds 34%, the impact absorption for the head is likely to be insufficient. On the other hand, even if the coefficient of restitution is 34% or less, there may be cases where the impact absorption for the head is insufficient.

[0088] On the other hand, by appropriately setting the bending resilience, it is presumed that the shock-absorbing member can absorb the shock force by deforming, and can further absorb the amount of shock by the restoring force due to the bending resilience that resists the deformation of the shock-absorbing member. In other words, when the amount of deformation of the shock-absorbing member is the same, it can be assumed that the amount of shock force absorbed by the deformation of the shock-absorbing member can be increased as compared with the case where the restoring force exceeds 29 gf·cm / cm. Therefore, increasing the amount of shock force absorbed makes it easier to mitigate the shock force transmitted to the head after the shock-absorbing member is crushed and deformed.

[0089] For example, when the bending resilience exceeds 29 gf·cm / cm, the shock-absorbing member can absorb the shock force by deforming. However, compared with the case where the bending resilience is 29 gf·cm / cm or less, it is presumed that the restoring force due to the bending resilience for resisting deformation is insufficient. Therefore, it is difficult to sufficiently mitigate the shock force transmitted to the head after the shock-absorbing member is crushed and deformed.

[0090] Further, since the bending resilience of the shock-absorbing member 3 is set to 29 gf·cm / cm or less, even when the shock-absorbing member is disposed on the headgear, displacement of the headgear can be suppressed. Specifically, for example, when the shock-absorbing member 3 is sewn circumferentially along the lower edge of the crown portion 21 of the cap 1, the cap 1 has its circumference extended along the head circumference as shown in FIG. 1 during wearing, and the curvature of the shock-absorbing member changes before and after the cap is worn. At this time, by setting the bending resilience 2HB to 29 gf·cm / cm or less, the cap 1 is less likely to be displaced with respect to the head due to the restoring resilience that tries to return to the base curvature of the shock-absorbing member. In other words, when it exceeds 29 gf·cm / cm, the shock-absorbing member has insufficient resilience to return to its original curvature, and is likely to be displaced with respect to the head.

[0091] Thus, if the cap 1 and the headband 101 are displaced with respect to the head, for example, there is a risk of degrading the performance of the play, such as the position of the flange portion 22 of the cap 1 worn so that the flange portion 22 is located on the back head side being displaced laterally.

[0092] For example, when an impact load from a ball is input to the shock-absorbing member 3 during wearing, such as during heading, the shock-absorbing member 3 undergoes bending deformation such that both side portions in the circumferential direction of the contacted portion are relatively positioned outside compared to the portion where the ball contacts. At this time, if the bending recovery 2HB exceeds 29 gf·cm / cm, the shock-absorbing member 3 lacks the recovery ability to return to its original state along the head circumference, leaving a portion that does not conform to the head partially, and the cap 1 and the headband 101 are likely to shift relative to the head.

[0093] (3) Since the bending rigidity of the shock-absorbing member 3 is set to 48.4 gf·cm 2 / cm or less, even when a shock-absorbing member is arranged in the headgear, it is possible to avoid inhibiting the wearing comfort of the headgear and sewing is possible. Specifically, when the bending rigidity exceeds 48.4 gf·cm 2 / cm, the bending rigidity of the portion where the shock-absorbing member is arranged becomes excessive, making it difficult to conform to the shape in the circumferential direction of the head. Further, in the portion where the shock-absorbing member is arranged and the bending rigidity becomes excessive, displacement is likely to occur because it does not conform to the head.

[0094] Also, when the bending rigidity of the shock-absorbing member 3 exceeds 48.4 gf·cm 2 / cm, for example, when the headgear is a cap and the shock-absorbing member is arranged along the circumferential direction of the head, it is difficult to sew the shock-absorbing member along the circumferential direction of the head of the cap. Also, the bending rigidity is preferably 25.45 gf·cm 2 / cm or more. When the bending rigidity is less than 25.45 gf·cm 2 / cm, the bending rigidity is insufficient, and for example, it is difficult to sew the portions where the sheet body 3a is sewn together (more specifically, the rear upper edge portion 41a and the rear edge portion 52, and the front upper edge portion 42a and the front edge portion 53) that are sewn together, such as in the case of a cap.

[0095] (4) Since the coefficient of restitution of the shock-absorbing member 3 is set to 34% or less, for example, it is possible to obtain a repulsive force for rebounding the ball while absorbing the impact on the head during heading. On the other hand, when the coefficient of restitution is less than 12%, for example, the repulsive force for rebounding the ball during heading is insufficient.

[0096] More specifically, generally, when the coefficient of restitution is small, the shock absorption rate improves, so when the rebound rate decreases, a sense of discomfort may occur due to insufficient ball rebound during heading or the like. In contrast, the inventor of the present application has obtained a new finding that even when the coefficient of restitution is 12%, a repulsive force for rebounding the ball that does not cause a sense of discomfort during heading can be obtained. Therefore, the upper and lower limit values of the coefficient of restitution of the shock-absorbing member described above are set based on this new finding, so that it is possible to have a repulsion without a sense of discomfort during heading while enhancing shock absorption during heading. As a result, it is possible to provide a headgear provided with a shock-absorbing member suitable for a headgear worn when performing sports.

[0097] (5) Since the thickness of the shock-absorbing member 3 is set to 3 mm or more and 5 mm or less, it is possible to achieve both shock absorption and a comfortable fit. Specifically, when it is less than 3 mm, shock absorption becomes insufficient, and when it exceeds 5 mm, a sense of discomfort may occur when wearing the headgear, the aesthetics may be impaired, and it may be difficult to sew along the head circumference of the headgear such as a cap.

[0098] (6) Since the shock-absorbing member 3 is provided at a position corresponding to the frontal region H1, for example, the impact load input to the head by heading or the like can be reduced.

[0099] (7) Since the shock-absorbing member is provided at a position corresponding to the occipital region H2, for example, the impact load input to the head during contact and falling can be reduced.

[0100] (8) Since the shock-absorbing member 3 is arranged corresponding to a pair of temporal regions H3 located between the frontal region H1 and the occipital region H2 in the circumferential direction portion, for example, when contact occurs between the heads of players during play, the impact load input to the temples and temporal regions can be reduced.

[0101] (9) Since the shock-absorbing member 3 is arranged corresponding to the vertex region H4 in the front-rear direction portion, for example, the impact load input to the head by falling, heading, etc. can be reduced.

[0102] In the above-described embodiment, the example of wearing with the flange portion 22 facing the occipital region H2 side of the wearer has been described, but it may be worn with the flange portion 22 facing the frontal region H1 side of the wearer.

[0103] Figs. 9 to 15 are photographs of the cap 1 provided with the shock-absorbing member 3.

[0104] [Second Embodiment] Fig. 6 shows a developed state of a headband 101 as a head-mounted device according to the second embodiment. Since the shock-absorbing member 103 made of the same material as in the first embodiment is used for the headband 101 according to the second embodiment, a detailed description of the shock-absorbing member 103 will be omitted.

[0105] Referring to Fig. 6, the headband 101 is a long strip-shaped member having a predetermined width. The headband 101 is generally entirely composed of the shock-absorbing member 103. More specifically, as shown in Fig. 7, the headband 101 is composed of a sheet body 103a, a surface material 103b covering the surface of this sheet body 103a, and a back material 103c covering the back surface. The sheet body 103a, the surface material 103b, and the back material 103c are sewn so as to surround while sandwiching the peripheral edge portion with an edge member 103d. The thickness T2 of the sheet body 103a is set to be 3 mm or more and 5 mm or less. As shown in Fig. 6, the width W4 of both end portions 132 of the headband 101 in the developed state is wider than the width W3 of the central portion 131 of the major axis of the headband 101.

[0106] As shown in FIG. 8, the headband 101 is wound around the head along the wearer's head circumference so that both end portions 132 come closer to form an annular shape. In the present embodiment, the headband 101 is connected by a hook-and-loop fastener 134 with both end portions 132 arranged on the posterior region H2 side. Therefore, the central portion 131 is arranged in the frontal region H1 of the wearer, and a connecting portion 133 connecting the central portion 131 and both end portions 132 is arranged in the temporal region H3. Thereby, the impact load input to the frontal part, the posterior part, and the temporal part of the wearer can be reduced by the headband 101.

[0107] FIGS. 16 to 24 are photographs of the headband 101 provided with the shock-absorbing member 3.

Example

[0108] The shock-absorbing members of each example and each comparative example were appropriately cut to prepare test pieces, and the shock absorption, bending rigidity, and bending recovery were measured. In addition, a sensory evaluation test of shock absorption and resilience was conducted on headbands (headwear) provided with the shock-absorbing members of Comparative Examples 1 to 3 and Examples 1 to 3. The measurement results and evaluation test results are shown in Table 1.

[0109] The test pieces used for shock absorption (restitution coefficient), bending rigidity, and bending recovery have a three-layer structure of a surface fabric, a shock-absorbing member, and a lining. For the surface fabric, TWINCOT UV (90% polyester, 10% polyurethane) manufactured by Asahi Kasei Corporation is adopted, and for the lining, a mesh (double raschel mesh 3 layers) is adopted. The following materials were adopted for the shock-absorbing members in Comparative Example 3 and Examples 1 to 3, respectively.

[0110] Comparative Example 1 is a state without a test piece or a state without wearing a headband. Comparative Example 2 is a two-layer structure test piece of a face material and a back material or a headband without a shock absorption member. Comparative Example 3 is a test piece or a headband in which a 3-mm thick Poron (a high-performance urethane foam product name: PORON, manufactured by Rogers Inoaak Co., Ltd.) is used for the shock absorption member. Example 1 is a test piece in which a 3-mm thick EVA (a closed-cell polyethylene foam product name: Sunperka C-700, manufactured by Sanwa Chemical Co., Ltd.) is used for the built-in shock absorption member. Example 2 is a test piece in which a 3-mm thick Trans Yellow (a low-rebound soft foam product name: Trans Yellow, manufactured by Daiichi Chemical Co., Ltd.) is used for the shock absorption member. Example 3 is a test piece or a headband in which a 5-mm thick Trans Yellow is used for the shock absorption member.

[0111] In the evaluation of the sensory test, as Comparative Example 1, a state without wearing a headgear (headband), a headband without a shock absorption b material of Comparative Example 2, and a state of wearing a headband with a built-in shock absorption member of Comparative Example 3, Example 1, and Example 3 were used to evaluate the shock absorption and resilience when the subject performed heading. Specifically, five subjects A to E (aged 11 to 12) were asked to throw a soccer ball (size 4 ball) from a place 5 m away from the coach from below, and when they performed heading, the shock absorption (painful / not painful) and resilience (flying / not flying) were compared between the cases with and without wearing each headband.

[0112] The shock absorbency by sensory evaluation was evaluated by comparing Comparative Examples 2 and 3 and Examples 1 to 3 with Comparative Example 1 without a headband, using "not feeling painful" as "〇", "less painful than Comparative Example 1" as "△", and "no difference from Comparative Example 1" as "×". The resilience by sensory evaluation was evaluated by comparing Comparative Examples 2 and 3 and Examples 1 to 3 with Comparative Example 1 without a headband, using "flying without any particular discomfort" as "〇", "slightly less likely to fly than Comparative Example 1" as "△", and "difficult to fly, with a sense of discomfort" as "×". Here, the sense of discomfort refers to "a state where the ball does not fly as expected". In Table 1, Comparative Examples 1 to 3 are cases where at least one of the evaluations of shock absorbency and resilience by sensory evaluation has an evaluation of "×", and Examples 1 to 3 are cases where at least one of the evaluations of shock absorbency and resilience by sensory evaluation has no evaluation of "×" (in other words, only combinations of evaluations of "△" or "〇").

[0113]

Table 1

[0114] As is clear from Table 1, the headbands according to Comparative Example 3 and Examples 1 to 3 incorporating the shock absorbing member 3 have a lower coefficient of restitution and better shock absorbency than Comparative Examples 1 and 2. From the results in Table 1, it is preferable to set it to 34% or less of Example 1, which has the largest coefficient of restitution, and based on this result, the upper limit value of the coefficient of restitution of the present invention is set. Therefore, in Comparative Example 2, since the coefficient of restitution is 65%, the result is insufficient shock absorption. In Comparative Example 3 and Examples 1 to 3, since the material and thickness of the shock absorbing member 3 are appropriate, the restitution rate is 12% to 34%, and the target of the shock absorption rate is achieved.

[0115] The evaluation results of the shock absorption performance by the sensory test are generally consistent with the results of the coefficient of restitution evaluation test. The headbands according to Examples 1 and 3 incorporating the shock absorption member 3 have improved shock absorption performance compared to Comparative Examples 1 to 3. In particular, for Example 3, the results were that it did not hurt or was not felt as painful compared to Comparative Examples 1 to 3. On the other hand, regarding the evaluation results by the subjects A and B of the headband according to Comparative Example 3, although there was no deterioration from Comparative Example 1 to Comparative Example 2, no improvement results were obtained. As will be described in detail later, it is considered that the bending recovery 2HB contributes to the shock absorption performance based on this result.

[0116] From the coefficient of restitution shown in Table 1, it is expected that the bounce of the ball during heading deteriorates in the order of Comparative Example 3, Example 3, Example 2, Example 1, Comparative Example 2, and Comparative Example 1. However, in terms of the restitution by the sensory test, even when the headbands according to Comparative Example 3 and Example 3 were worn, there were no evaluation results of "difficult to jump, with a sense of discomfort". From this, a new finding was obtained that even when the shock absorption member 3 with a coefficient of restitution of 12% is incorporated, the bounce of the ball during heading is not significantly deteriorated.

[0117] In other words, in Comparative Examples 1 and 2, while having the required restitution during heading, the shock absorption performance is insufficient. In Comparative Examples 3 and Example 3, while absorbing the impact load during heading, generally the desired restitution can be obtained. Therefore, by setting the shock absorption member 3 to be equal to or higher than the coefficient of restitution of Comparative Example 3, which is the lowest coefficient of restitution among Comparative Example 3 and Example 3, both shock absorption performance and restitution can be achieved. Based on this result, the upper and lower limit values of the coefficient of restitution of the present invention are set.

[0118] The flexural rigidity B indicates that the greater the value, the greater the flexural rigidity. Therefore, if it exceeds an appropriate upper limit value, it becomes difficult to sew the shock-absorbing member along the shapes of the cap and the headband. In the caps and headbands incorporating the shock-absorbing members of Comparative Example 3 and Examples 1 to 3, the shock-absorbing member can be sewn along the shapes of the caps and headbands that are easy to conform to the wearer's head (easy to obtain a fitting feeling). Therefore, as shown in Table 1, the flexural rigidity B is rounded to the second decimal place of the value of Example 3, which has the greatest flexural rigidity B, to 48.4 gf·cm 2 / cm or less, and based on this result, the upper limit value of the flexural rigidity B of the present invention is set.

[0119] Also, since the smaller the value of the flexural rigidity B, the softer it is, if it is less than an appropriate lower limit value, it becomes difficult to sew the shock-absorbing member as a cap. In the caps incorporating the shock-absorbing members of Comparative Example 3 and Examples 1 to 3, since sewing is possible, as shown in Table 1, the flexural rigidity B is rounded to the second decimal place of the value of Example 3, which has the smallest flexural rigidity, to 25.45 gf·cm 2 / cm or less, and based on this result, the lower limit value of the flexural rigidity B of the present invention is set.

[0120] The bending resilience 2HB indicates that the smaller the value, the better the resilience from bending deformation and the more elastic it is. Therefore, by appropriately setting the bending resilience, the displacement of the cap and headband with respect to the head can be suppressed. Specifically, for example, when the shock-absorbing member is sewn circumferentially along the lower edge of the crown portion of the cap, when the cap is worn, as shown in FIG. 1, the circumference of the cap is extended along the head circumference, and the curvature of the shock-absorbing member changes before and after the cap is worn. At this time, by setting the bending resilience 2HB below the upper limit value, the resilience of the shock-absorbing member to return to its original curvature makes it difficult for the cap 1 to shift with respect to the head. In other words, when the bending resilience 2HB exceeds the upper limit value, the shock-absorbing member lacks the resilience to return to its original curvature, and displacement occurs with respect to the head.

[0121] Further, when an impact load from the ball is input to the shock-absorbing member during heading or the like, the shock-absorbing member undergoes a bending deformation such that both side portions in the circumferential direction of the contacted portion are relatively positioned outside the contacted portion rather than the portion where the ball contacts. At this time, if the bending resilience 2HB exceeds the upper limit value, the shock-absorbing member has insufficient resilience to return to its original state along the head circumference, leaving a portion that does not conform to the head partially, and the cap and headband are likely to shift relative to the head.

[0122] Thus, when the cap and headband shift relative to the head, there is a risk of degrading the performance of the play, such as the position of the flange portion of the cap worn so that the flange portion is located on the back head side shifting laterally. In the sensory evaluation, in Example 1 and Example 3 in which a headband incorporating a shock-absorbing member was worn, there was no discomfort such as the headband shifting during heading.

[0123] In addition, in the results of the sensory evaluation of the shock absorbency of Subjects A and B, although Comparative Example 3 did not deteriorate compared to Comparative Examples 1 and 2, no improvement was obtained. This indicates that there is a correlation between the bending resilience 2HB and the shock absorbency. The bending resilience 2HB of the shock absorbing member in Comparative Example 3 is greater than that in Example 1 and Example 3, suggesting that the effect of reducing the impact force input to the head is insufficient. On the other hand, in Example 1 and Example 3, the shock absorbency of all of Subjects A to E has improved. It is considered that Comparative Example 1 and Example 3 have obtained the effect of reducing the impact force input to the head due to the bending resilience 2HB. Therefore, considering the evaluation results that the deterioration of Subjects A and B in Comparative Example 3 does not occur and the improvement of Subjects C to E in the evaluation of the shock absorbency, if the upper limit value of the bending resilience 2HB is slightly lower than that of Comparative Example 3 which does not satisfy the shock absorbency, it can be estimated that the shock absorbency is improved (satisfies the shock absorbency) compared to Comparative Examples 1 and 2. Thus, it is preferable to set the upper limit value of the bending resilience 2HB to 29 gf·cm / cm or less, which is lower than that of Comparative Example 3. More preferably, it is preferable to set it to 21.5824 gf·cm / cm or less, which is the largest value among Example 1 and Example 3 where all of Subjects A to E satisfy the shock absorbency.

[0124] Specifically, by setting the bending resilience to 29 gf·cm / cm or less, it is estimated that the shock absorbing member 3 can absorb the impact force by deforming and, furthermore, absorb the impact amount by the restoring force due to the bending resilience 2HB that resists the deformation of the shock absorbing member 3. In other words, assuming the same deformation amount of the shock absorbing member 3, it can be assumed that the amount of impact force absorbed by the deformation of the shock absorbing member 3 can be increased compared to the case where the bending resilience exceeds 29 gf·cm / cm. Therefore, increasing the amount of impact force absorbed makes it easier to relieve the impact force transmitted to the head after the shock absorbing member 3 is crushed and deformed.

[0125] As in Comparative Example 3, when the bending resilience exceeds 29 gf·cm / cm, the shock-absorbing member 3 can absorb the impact force by deforming. However, compared with the case where the bending resilience is 29 gf·cm / cm or less, it is presumed that the restoring force due to the bending resilience for resisting deformation is insufficient. Therefore, the impact force transmitted to the head after the crushing deformation of the shock-absorbing member 3 is difficult to be sufficiently alleviated.

[0126] As described above, although there is a correlation between the value of the coefficient of restitution and the shock-absorbing property, it is difficult to determine whether the suppression of the impact on the head is achieved only by evaluating the coefficient of restitution. It has been found that the shock-absorbing property changes depending on other parameters such as the bending resilience 2HB. In other words, in addition to the coefficient of restitution, the amount of shock absorption can be achieved by appropriately setting the bending resilience 2HB as another factor, and a new finding is obtained that it is necessary to directly evaluate the amount of impact input to the head.

[0127] Based on this new finding, in Evaluation Test 1, using Example 1 and Example 3, which were the results of sensory evaluation showing good shock-absorbing properties, the amount of impact (first impact amount) input without passing through the shock-absorbing material and the amount of impact (second impact amount) input through the shock-absorbing material were measured, and the ratio of the second impact amount to the first impact amount was calculated respectively. In Evaluation Test 1, the impact acceleration was used as the amount of impact.

[0128] [Evaluation Test 1] An evaluation test was conducted to evaluate the shock-absorbing performance of the headband 101 and the cap 1 worn on the head and neck of the dummy humanoid (hereinafter also referred to as "head mannequin") 200 for the collision test. The sheet body 3a of the shock-absorbing member 3 provided in the headband 101 corresponding to Example 1 of this evaluation test is composed of a closed-cell polyethylene foam (hereinafter referred to as EVA) manufactured by Sanwa Chemical Co., Ltd., product name: Sunperka C-700 (thickness 3 mm). The sheet body 3a of the shock-absorbing member 3 provided in the headband 101 corresponding to Example 3 is composed of a low-rebound soft foam manufactured by Daiichi Chemical Co., Ltd., product name: Trans Yellow (thickness 5 mm).

[0129] As shown in FIG. 25, the head 201 of the head mannequin 200 with the headband 101 attached was freely dropped from a predetermined dropping height h, and the impact acceleration input to the head 201 was measured.

[0130] As the sheet body 3a of the shock absorbing member 3, when the headband 101 incorporating trans-yellow or EVA was attached and when there was no protector, the head 201 with the triaxial accelerometer 302 attached was dropped freely from a predetermined dropping height (for example, 5 cm, 15 cm) h onto a strong steel plate (which does not distort even when the head 201 is dropped), and the head acceleration (maximum triaxial combined acceleration) generated at the head center of gravity G was measured to evaluate the ratio of the impact amount when the headband 101 was attached to that when the headband 101 was not attached.

[0131]

Table 2

[0132] Table 2 shows the test results of Evaluation Test 1. When the predetermined dropping height h = 5 cm, the head combined acceleration of Comparative Example 1 (when there was no protector) was 53 G (519 m / s 2 ), while the head combined accelerations of Example 1 (when the headband 101 incorporating EVA was attached) and Example 3 (when the headband 101 incorporating trans-yellow was attached) were 31 G (304 m / s 2 ). When the predetermined dropping height h = 15 cm, the head combined acceleration of Example 1 was 125 G (1225 m / s 2 ), while the head combined acceleration of Example 1 was 71 G (695.8 m / s 2 ), and the head combined acceleration of Example 4 was 78 G (764 m / s 2 ).

[0133] Therefore, the ratio of the combined acceleration when the headband 101 is worn to the head combined acceleration in Example 1 and Example 3 for a predetermined drop height h = 5 cm is 58.5% (the reduction degree is 41.5%). The ratio of the head combined acceleration when the headband 101 is worn to the head combined acceleration in Comparative Example 1 for a predetermined drop height h = 15 cm is 57.6% (the reduction degree is 42.4%) for Example 1 and 62.4% (the reduction degree is 37.6%) for Example 3, respectively. From the results of Evaluation Test 1, it was found that the ratio of the impact amount when the headband 101 is worn to the impact amount input to the head mannequin 200 when the headband 101 is not worn has a similar reduction effect in Example 1 and Example 3.

[0134] Furthermore, in order to more appropriately set the ratio of the second impact amount to the first impact amount and the second impact amount input to the head via the shock absorption member, the applicant of the present application set the first impact amount to a value that can be input during a soccer play in Evaluation Test 2, and calculated the ratio of the second impact amount to the first impact amount and measured the second impact amount. In Evaluation Test 2, similar to Evaluation Test 1, the impact acceleration was used as the impact amount.

[0135] [Evaluation Test 2] An evaluation test was conducted to evaluate the shock absorption performance of the headband 101 and the cap 1 worn on the head and neck of a dummy doll for collision tests (hereinafter also referred to as "head mannequin") 200. In this evaluation test, the sheet body 3a of the shock absorption member 3 provided in the headband 101 is made of a low-rebound soft foam manufactured by Daiichi Chemical Co., Ltd., product name: Trans Yellow (thickness 5 mm). In this evaluation test, for the head mannequin 200 with the headband 101 attached and the head mannequin 200 without attachment, the largest first impact amount that can be input to the head during a soccer play was input, and the second impact amount input to the head mannequin 101 via the headband 101 during a soccer play was measured, and the ratio of the second impact amount to the first impact amount was evaluated. In this embodiment, based on the results of the shock absorption properties in the evaluation test 2 and the examples, it is determined that the headband 101 satisfies the desired shock absorption properties when the ratio of the second impact amount to the first impact amount is 57% or less.

[0136] In this embodiment, the head acceleration of the head mannequin is used as the impact amount. In other words, it is determined that the shock absorption property of the headband 101 is satisfied when the ratio of the head acceleration when the headband is attached to the head acceleration when not attached is 57% or less. In this evaluation test, as a method of inputting an impact amount to the head mannequin 200, a spherical impactor 301 was used.

[0137] FIG. 26 shows the head mannequin 200 with the headband 101 not attached and the state in which the headband 101 shown by the two-dot chain line is attached to the head mannequin 200. The headband 101 is attached along the circumferential direction from the forehead 211 to the back of the head 212 of the head mannequin 200. The impactor 301 is configured to collide with the headband 101 attached to the head mannequin 200. In this evaluation test, the head accelerations (m / s 2 ) in the state where the headband 101 is not attached (hereinafter also referred to as "without protector") shown in FIG. 25 and the state where the headband 101 is attached were acquired. In this evaluation test, in consideration of the reproducibility of the data, the test was carried out three times under the same conditions.

[0138] The head mannequin 200 used in this evaluation test is called Hybrid III 5th Female and corresponds to the head 201 and neck 202 of a dummy representing a petite adult female. The dummy was developed to evaluate the crash safety performance of automobiles and has a height of 150 cm, a weight of 50 kg, a combined head + neck weight of 4.6 kg, and a head circumference of 53.8 kg. The dummy used in this evaluation test is also used to examine the equipment and potential for injury in recreational vehicles, wheelchairs, medical devices, sports equipment, etc., in addition to automobiles. In this evaluation test, the head 201 and neck 202 were removed from the dummy, and a triaxial accelerometer (hereinafter also referred to as the "accelerometer") 302 was installed at the center of gravity position G of the head 201.

[0139] Figure 26 also shows the accelerometer 302 attached to the head mannequin 200 and its sensitivity direction. The front-rear direction of the head mannequin 200 is Ax, the left-right direction is Ay, and the up-down direction is Az, with the front, left, and up being defined as positive.

[0140] Figure 25 shows the calibration method for the head mannequin 200. Whether the head mannequin 200 has the characteristics of the required specifications was confirmed by conducting a calibration test. As shown in Figure 25, the characteristics of the required specifications for the head mannequin 200 are that at a test temperature of 18.9 - 25.6 degrees and a test humidity of 10 - 70%, when the head 201 is freely dropped from a height h = 37.6 cm onto a rigid steel plate (one that does not distort even when the head 201 is dropped), the head acceleration (maximum three-axis combined acceleration) generated at the head center of gravity G is within the range of 250 - 300 G, and the maximum lateral acceleration in the Ay direction is -15.0 - 15.0 G. Also, it is specified that the shape of the acceleration curve is such that the second peak is 10% or less of the first peak. In this evaluation test, the test temperature was 21.1 degrees, the test humidity was 48%, the maximum three-axis combined acceleration was 267.1 G, the maximum lateral acceleration was 2.4 G, and the shape of the acceleration curve had a second peak that was 1.6% of the first peak.

[0141] Figure 27 shows the impact resistance test device (impact force input means) 300 used in this evaluation test. The impact resistance test device 300 is a device used for the impact resistance test of JIS T9203 "Electric Wheelchair". The impact resistance test device 300 is a method of raising a pendulum type impactor 301 to a predetermined height (angle control) and releasing the impactor 301 fixed by a quick release device to cause it to collide with the target object. The impactor 301 is spherical, has the same size as a No. 5 soccer ball, and has a mass of 25 kg.

[0142] Figure 28 shows the method of conducting the evaluation test. In this evaluation test, the head mannequin 200 removed from the dummy is attached to the aluminum frame 221, and further, the lower end of the aluminum frame 221 is fixed to the bearing unit 222, so that it has a configuration of falling backward after colliding with the impactor 301. The height h1 from the rotation axis 223 of the bearing unit 223 to the head center of gravity G is set to 70 cm in accordance with the length of the pendulum used in this evaluation test.

[0143] The dropping angle θ1 of the impactor 301 is set to 20 degrees. The dropping angle θ1 was determined with reference to the research results in the United States (NAUNHEIM, R.S. et al., Linear and Angular Head Accelerations Med. Sci. Sports Exerc., Vol. 35, No. 8, pp. 1406 - 1412, 2003). Specifically, the head acceleration generated when a subject (an adult male with soccer experience) heads a soccer ball was measured. When the ball speed is 12 m / s, it is described that an acceleration of 199 ± 27 m / s 2 occurs in the subject's head. Based on this result, in this evaluation test, the head acceleration of the head mannequin 200 without a protector is 226 m / s, which is the maximum range of the research results 2 (199 + 27 m / s 2 ) equivalent to 1.5 times (considering the safety factor) of 340 m / s 2 is set as the dropping angle θ1. In other words, in this embodiment, as an example of the largest first impact amount that can be input to the head during soccer play, a head acceleration of 340 m / s2 was used. The first impact amount may be any impact amount that can be input to the head during a soccer play. For example, among the impact amounts on the head due to collisions between heads during competition in heading, or between the head and the elbow or the ground, etc., the largest impact amount may be adopted as the first impact amount. For example, when the head collides with the ground during competition in heading (when falling from 2.5 m), the head acceleration may become 490 m / s 2 and so on.

[0144] Fig. 29 shows the method of measuring acceleration. The data output from the accelerometer 302 is recorded in a data recording device (manufactured by Kyowa Electronic Instruments Co., Ltd.: model number DIS-2000A) 303 via a transmission cable, and is taken into a measurement personal computer 304 connected to the data recording device 303 for calculation processing. Regarding the data acquisition and filter processing method of acceleration, it conforms to the international standard ISO 6487: Road vehicles - Measurement techniques in impact tests - Instrumentation.

[0145] Table 1 shows a list of the measurement results in the evaluation test. More specifically, the head accelerations in the front-rear direction Ax, left-right direction Ay, and up-down direction Az obtained by the triaxial accelerometer 302, and Head Resultant = (Ax 2 + Ay 2 + Ax 2 ) -2 are used to calculate the head resultant acceleration (Head Resultant), which is taken as the head acceleration. In this evaluation test, in order to verify the reproducibility of the data, the same test was repeated three times. In this evaluation test, since the head acceleration is used as the impact amount, the triaxial accelerometer 302 constitutes the impact amount sensor.

[0146]

Table 3

[0147] Figure 30 shows the time variation of the average value of the head combined acceleration in Example 3 (when the headband 101 with built-in trans-yellow is worn) and Comparative Example 1 (when there is no protector). As shown in Table 3 and Figure 30, the head combined acceleration in Comparative Example 1 was 340 m / s 2 whereas the head acceleration in Example 3 was 194 m / s 2 and the ratio of the combined acceleration when the headband 101 is worn to the head combined acceleration without the protector is 57% (the reduction degree is 43%). In other words, the ratio of the impact amount (the second impact amount) when the headband 101 is worn to the impact amount (the first impact amount) that can be input to the head mannequin 200 when the headband 101 is not worn is 57% or less, so the headband 101 satisfies the desired shock absorption performance.

[0148] Regarding the shock absorption performance of the headband 101, when the head combined acceleration (shock acceleration) when the headband 101 is worn is 199 m / s 2 or less, the headband 101 may be determined to satisfy the shock absorption performance. The upper limit value of the shock acceleration was set based on the largest value among the shock accelerations in Example 3 of [Evaluation Test 2] and the results of the sensory test of the shock absorption property of Example 3.

[0149] The head combined acceleration was used as the evaluation of the shock absorption performance input to the head. Instead of this, as shown in Table 1, the HIC value may be used for evaluation. Referring to Table 1, the average value of the HIC value without the protector was 18.3, whereas the average value of the HIC value when the headband 101 was worn was 7. Therefore, the ratio of the HIC value when the headband 101 was worn to the HIC value without the protector was 38% (the reduction degree was 62%). In other words, the ratio of the impact amount (the second impact amount) when the headband 101 is worn to the impact amount (the first impact amount) that is input to the head mannequin 200 when the headband 101 is not worn is 57% or less, so the headband 101 satisfies the desired shock absorption performance.

[0150] In Evaluation Test 2, the case where the headband 101 was worn as the headgear was described, but the same results can be obtained for the cap 1 as well.

[0151] In the above-described embodiment, the shock-absorbing member 3 having the first shock-absorbing member 4 and the second shock-absorbing member 5 was described, but the present invention is not limited thereto, and either the first shock-absorbing member 4 or the second shock-absorbing member 5 may be provided.

[0152] In the above-described embodiment, the first shock-absorbing member 4 continuously extends in the circumferential direction (head circumference direction) along the lower end peripheral portion of the crown portion 21, but the present invention is not limited thereto, and a plurality of shock-absorbing members may be arranged in the circumferential direction.

[0153] In the above-described embodiment, the second shock-absorbing member 5 continuously extends in the front-rear direction, but the present invention is not limited thereto, and a plurality of shock-absorbing members may be arranged in the front-rear direction.

[0154] Note that the headgear of the present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible.

[0155] The headgear 1 of the present invention is suitable for playing soccer. However, in addition to that, it can also be applied when performing other sports or the like in which the head may be impacted due to contact between players, falling, or the like.

Explanation of Reference Numerals

[0156] 1 Soccer cap (headgear) 2 Headgear main body 3 Shock-absorbing member 21a Rear covering portion 21b Front covering portion 21c Pair of side covering portions 21d Upper covering portion 101 Headband (headgear) 200 Head mannequin 211 Forehead 212 Occipital region 300 Impact force input means 301 Impactor 302 Accelerometer (impact amount sensor) h1 Predetermined drop height H1 Frontal region H2 Occipital region H3 Pair of temporal regions H4 Vertex region T1 Thickness T2 Thickness

Claims

1. a headgear main body to be worn on the head; and a shock absorbing member provided on the headgear main body, configured such that a ratio of a second impact amount that can be input to the head through the shock absorbing member during a soccer play to a maximum first impact amount that is assumed to be input to the head without passing through the shock absorbing member during the soccer play is 57% or less; a headgear, wherein a bending recovery property of the shock absorbing member is set to 29 gf·cm / cm or less.

2. a headgear main body to be worn on the head; and a shock absorbing member provided on the headgear main body, wherein a coefficient of restitution of the shock absorbing member is set to 34% or less; a headgear, wherein a bending recovery property of the shock absorbing member is set to 29 gf·cm / cm or less.

3. The bending rigidity of the shock absorbing member is set to 48.4 gf·cm ２ / cm or less. The head-mounted device according to claim 1 or claim 2.

4. The headgear according to claim 2, wherein the coefficient of restitution of the shock absorbing member is set to 12% or more.

5. The headgear according to claim 1 or claim 2, wherein a thickness of the shock absorbing member is set to 3 mm or more and 5 mm or less.

6. wherein the headgear main body has a rear covering portion corresponding to a forehead region of a wearer; The headgear according to claim 1 or claim 2, wherein the shock absorbing member is disposed at least in a part of the rear covering portion.

7. wherein the headgear main body has a front covering portion corresponding to an occipital region of the wearer; The headgear according to claim 1 or claim 2, wherein the shock absorbing member is disposed at least in a part of the front covering portion.

8. wherein the headgear main body has a pair of side covering portions corresponding to a pair of temporal regions of the wearer; The headgear according to claim 1 or claim 2, wherein the shock absorbing member is disposed at least in a part of the pair of side covering portions.

9. wherein the headgear main body has an upper covering portion corresponding to a vertex region of the wearer; The headgear according to claim 1 or claim 2, wherein the shock absorbing member is disposed at least in a part of the upper covering portion.

10. The headgear according to claim 1 or claim 2, wherein the headgear is a cap.

11. The headgear according to claim 1 or claim 2, wherein the headgear is a headband.

12. A method for evaluating a shock absorbing performance input to the head through the headgear, The head mannequin for evaluating the shock absorption performance is provided with a shock amount sensor for measuring the amount of shock input to the head mannequin. The headgear is worn along the circumferential direction from at least the forehead to the back of the head of the head mannequin. By means of shock force input means, the largest first shock amount assumed to be input to the head during a soccer play is input to the head mannequin with the headgear worn and the head mannequin without the headgear worn. Measure the second shock amount that can be input to the head through the headgear during a soccer play. A method for evaluating the shock absorption performance of the headgear according to claim 1, as the ratio of the second shock amount to the first shock amount.

13. When the ratio is 57% or less, The method according to claim 12, wherein the headgear is determined to satisfy a predetermined shock absorption performance.

14. The method according to claim 12 or claim 13, wherein the shock amount sensor measures shock acceleration.

15. The impact acceleration input to the head through the shock absorbing member is 199 m / s ２ The method according to claim 14, wherein the headgear determines that it satisfies the shock absorption performance when the following conditions are met.

16. The method according to claim 12 or claim 13, wherein the shock force input means has a configuration in which a pendulum type impactor is collided with the head mannequin in a stationary state.

17. The method according to claim 12 or claim 13, wherein the shock force input means inputs a shock force to the head mannequin by freely dropping the head mannequin from a predetermined drop height.

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