JP4255698B2 - Tennis shoes - Google Patents

Description

【００４８】
表１に示されるように、各実施例のアウトソールは、全ての項目において良好な評価結果となっている。この結果から、本発明の優位性は明らかである。
【００４９】
【発明の効果】
以上説明されたように、本発明のテニスシューズは、防滑性能及びスライド性能の両方に優れている。このテニスシューズは、プレーヤーの競技成績の向上に寄与しうる。
【図面の簡単な説明】
【図１】図１は、本発明の一実施形態にかかるテニスシューズが示された側面図である。
【図２】図２は、図１のテニスシューズが示された底面図である。
【図３】図３は、図２のソールの一部が示された下方からの斜視図である。
【図４】図４は、図２のソールの一部が示された拡大断面図である。
【図５】図５は、本発明の他の実施形態に係るテニスシューズのソールの一部が示された断面図である。
【図６】図６は、本発明のさらに他の実施形態に係るテニスシューズのソールの一部が示された断面図である。
【図７】図７は、本発明のさらに他の実施形態に係るテニスシューズのソールが示された底面図である。
【図８】図８は、図７のソールの一部が示された拡大断面図である。
【符号の説明】
１・・・テニスシューズ
３・・・アッパー
５、１７、２９、４１・・・ソール
７、２１、３３、４３・・・ベース
９、１９、３１、４５・・・横筋山
１１、２３、３５、４９・・・接地面
１３、２５、３７・・・爪先側壁面
１５、２７、３９・・・踵側壁面
４７・・・縦筋山
５１・・・インサイド壁面
５３・・・アウトサイド壁面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to tennis shoes. Specifically, the present invention relates to an improvement in the bottom surface of a tennis shoe.
[0002]
[Prior art]
In a tennis rally, the player makes a stroke while moving violently through the court. The player predicts the direction of the ball from the opponent's stroke and moves toward the target point. Movement takes place when the foot kicks the ground. When approaching the target point, the player stops the kick and adjusts the posture of the stroke. After this, the player's feet slide with the ground. Although it is a short distance, the player's body moves forward by sliding. Most of the movement to the target point is by kick, but the final stage of movement is by slide. The player who reaches the target point makes a stroke. The player then flips his body, kicks the ground and moves to the next target point.
[0003]
In the movement by kick, it is preferable that the tennis shoes and the ground do not slip. Tennis shoes are required to have anti-slip performance. On the other hand, in the movement by the slide, it is preferable that the tennis shoes and the ground slip appropriately. Tennis shoes are required to have sliding performance. Japanese Patent Application Laid-Open No. 7-213304 discloses a tennis shoe in which both the anti-slip performance and the slide performance are achieved by devising the planar shape of the protrusion on the bottom surface.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-213304
[Problems to be solved by the invention]
Even the tennis shoes disclosed in the above publication do not have sufficient anti-slip performance and slide performance. An object of the present invention is to provide a tennis shoe that is excellent in anti-slip performance and sliding performance, and that is used particularly in a tennis court having a large coefficient of friction with the bottom surface of the tennis shoe.
[0006]
In the previous invention (Japanese Patent Application No. 2002-296980), the inventor is provided with a number of streak parallel to the bottom surface, and the cross-sectional shape of the streak is asymmetrical, and friction in one direction of the bottom surface A tennis shoe was proposed in which the ratio (μa / μb) between the coefficient μa and the friction coefficient μb in the reverse direction is 0.3 or more and 0.9 or less. In this earlier application, the focus was on the play performance of tennis shoes on an artificial grass tennis court with sand. The present inventor has found that the action and effect of the bottom surface of a tennis shoe having a number of muscle mountains in parallel may differ depending on the properties of the tennis court in which the shoe is used. The tennis shoes used in the hard court have arrived at the present invention because a desired function cannot be obtained unless the constitution is different from that for the artificial grass tennis court with sand.
[0007]
[Means for Solving the Problems]
The tennis shoe according to the present invention includes a large number of transverse muscles juxtaposed on the bottom surface thereof. The horizontal streak includes a grounding surface, a toe side wall surface and a heel side wall surface that are continuous with the grounding surface. The inclination angle θa of the toe side wall surface is larger than the inclination angle θb of the heel side wall surface. When the friction coefficient is measured on the hard coat, the ratio (μa / μb) between the friction coefficient μa in the toe direction on the bottom surface and the friction coefficient μb in the heel side direction is 0.3 or more and 0.9 or less. This tennis shoe is excellent in sliding performance in the toe direction and anti-slip performance in the heel direction.
[0008]
The difference (θa−θb) between the inclination angle θa of the toe side wall surface and the inclination angle θb of the heel side wall surface is preferably 10 ° to 60 °. This tennis shoe is excellent in sliding performance in the toe direction and anti-slip performance in the heel direction.
[0009]
The preferred height of the horizontal streak is 1 mm or more and 8 mm or less.
[0010]
Preferably, the tennis shoe further includes a vertical streak extending in the length direction. A horizontal streak is mainly formed in a region of the bottom surface closer to the toe than the center in the length direction and outside the center in the width direction. A longitudinal streak is mainly formed in a region of the bottom surface closer to the toe than the center in the length direction and inside the center in the width direction. This tennis shoe is excellent in sliding performance when moving forward and anti-slip performance when changing direction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.
[0012]
FIG. 1 is a side view showing a tennis shoe 1 according to an embodiment of the present invention. The tennis shoe 1 includes an upper 3 and a sole 5. The material of the upper 3 is equivalent to that of a known tennis shoe. The material of the sole 5 is the same as that of a known tennis shoe. Generally, the sole 5 is composed of a crosslinked rubber or a synthetic resin.
[0013]
FIG. 2 is a bottom view showing the tennis shoe 1 of FIG. In FIG. 2, the sole 5 is shown. In FIG. 2, the upper side is the toe side, the lower side is the heel side, the right side is the outside, and the left side is the inside. This sole 5 is for the left foot. The sole for the right foot has a shape obtained by inverting the shape shown in FIG.
[0014]
The sole 5 includes a base 7 and a large number of transverse muscle mountains 9. The horizontal streak 9 is formed integrally with the base 7 and protrudes from the base 7. The horizontal streak 9 extends in the width direction (left-right direction in FIG. 2). A large number of horizontal stripes 9 are arranged in parallel at a predetermined interval. In the area corresponding to the arch, the horizontal streak 9 does not exist.
[0015]
FIG. 3 is a perspective view from below showing a part of the sole 5 in FIG. 2, and FIG. 4 is an enlarged cross-sectional view showing a part thereof. In these figures, the left side is the toe side and the right side is the heel side. As is clear from FIGS. 3 and 4, the horizontal streak 9 includes a contact surface 11, a toe side wall surface 13, and a heel side wall surface 15. The ground contact surface 11 is a surface in contact with the ground when the tennis shoes 1 are worn. The toe side wall surface 13 is continuous to the ground contact surface 11 and is located closer to the toe side than the ground contact surface 11. The heel side wall surface 15 is continuous with the ground contact surface 11 and is located on the heel side with respect to the ground contact surface 11.
[0016]
In FIG. 4, what is indicated by a double arrow θa is the inclination angle of the toe side wall surface 13. The inclination angle θa is an angle formed by the toe side wall surface 13 with respect to the horizontal plane G (ground). In FIG. 4, what is indicated by a double-headed arrow θb is the inclination angle of the heel side wall surface 15. The inclination angle θb is an angle formed by the side wall surface 15 with respect to the horizontal plane G. The inclination angle θa is larger than the inclination angle θb.
[0017]
The inclination of the toe side wall surface 13 stands more than that of the heel side wall surface 15. Due to this shape effect, directionality occurs in the rigidity of the horizontal streak mountain 9. The muscle mountain having this cross-sectional shape is not easily deformed to the toe side and is easily deformed to the heel side.
[0018]
When the tennis shoe 1 is placed on the ground having a smooth surface and a large coefficient of friction with the bottom surface of the tennis shoe, when the tennis shoe 1 is pulled in the toe direction, the pulling force is mainly applied to the toe side wall surface 13. Since the horizontal streak 9 is hard to deform on the toe side, an increase in the contact area between the ground surface and the bottom surface is suppressed, and the friction coefficient μa is small. When the player slides the shoe, the sliding direction is the toe direction. Since this tennis shoe 1 has a small coefficient of friction μa, it has excellent sliding performance. A player wearing this tennis shoe 1 can smoothly transition from movement to stroke. The slide also contributes to mitigating impact when landing. The tennis court corresponding to the ground having a large coefficient of friction means a hard court, a carpet court, an artificial turf court not filled with sand, and the like. The tennis shoes of the present invention are suitable for these tennis courts, particularly for hard courts.
[0019]
When the tennis shoe 1 is placed on the ground having a large friction coefficient and pulled in the heel direction, the pulling force is mainly applied to the heel side wall surface 15. Since the inclination of the heel side wall surface 15 is gentle, the contact area between the ground surface and the bottom surface increases and the friction coefficient μb is large, contrary to the case of the toe side. When a player moves forward by kicking the ground, the kick direction is the heel direction. Since this tennis shoe 1 has a large friction coefficient μb, it is excellent in anti-slip performance when kicking.
[0020]
From the viewpoint of achieving both slide performance and anti-slip performance, the ratio (μa / μb) between the friction coefficient μa and the friction coefficient μb is preferably 0.9 or less, and more preferably 0.7 or less. If the ratio (μa / μb) is too small, unintentional slip in the toe direction tends to occur, so the ratio (μa / μb) is preferably 0.3 or more, and more preferably 0.5 or more. The coefficient of friction is measured on a hard coat with a surface layer made of polyurethane. In the measurement, a vertical load of 600 N is applied to the tennis shoe 1 and a horizontal force is applied so that the tennis shoe 1 is pulled in a predetermined direction at a speed of 50 cm / s. The pulling force is detected by the load cell, and the pulling force is divided by the vertical load to calculate the friction coefficient.
[0021]
From the viewpoint of achieving both sliding performance and anti-slip performance, the difference (θa−θb) is preferably 10 ° (degree) or more, and more preferably 20 ° or more. If the difference (θa−θb) is excessive, an unintended slip in the toe direction tends to occur, and therefore the difference (θa−θb) is preferably 60 ° or less, and more preferably 50 ° or less. The inclination angle θa is preferably 50 ° or more and 90 ° or less. The inclination angle θb is preferably 30 ° or more and 70 ° or less.
[0022]
The height H of the horizontal streak 9 is preferably 1 mm or more and 8 mm or less. When the height H is less than the above range, the anti-slip performance may be insufficient. In this respect, the height H is more preferably 2 mm or more. If the height H exceeds the above range, the stiffness of the horizontal streak 9 may be insufficient. In this respect, the height H is more preferably 6 mm or less.
[0023]
The ratio (L2 / L1) of the distance L2 of the ground plane 11 to the distance L1 of the boundary portion between the base 7 and the horizontal stripes 9 is preferably 0.2 or more and 0.8 or less. If the ratio (L2 / L1) is less than the above range, the stiffness of the horizontal stripe 9 may be insufficient. In this respect, the ratio (L2 / L1) is more preferably equal to or greater than 0.3. When the ratio (L2 / L1) exceeds the above range, the contact pressure may be insufficient and the anti-slip performance may be insufficient. In this respect, the ratio (L2 / L1) is particularly preferably equal to or less than 0.6.
[0024]
The ratio of the total area of all the ground planes to the projected area of the bottom surface is preferably 15% or more and 70% or less. When the ratio is less than the above range, the ground contact surface is likely to be worn. From this viewpoint, the ratio is more preferably 25% or more. If the ratio exceeds the above range, the contact pressure may be insufficient and the anti-slip performance may be insufficient. From this viewpoint, the ratio is more preferably 60% or less.
[0025]
FIG. 5 is a cross-sectional view showing a part of a sole 17 of a tennis shoe according to another embodiment of the present invention. In this figure, the horizontal stripe 19 and the base 21 are shown. In this figure, the left side is the toe side, and the right side is the heel side. The cross-sectional shape of the horizontal streak 19 is asymmetric. The horizontal streak 19 includes a grounding surface 23, a toe side wall surface 25, and a heel side wall surface 27. The heel side wall surface 27 is curved. Similar to the sole 5 shown in FIG. 2, the sole 17 includes a large number of horizontal stripes 19 arranged in parallel.
[0026]
In FIG. 5, what is indicated by a two-dot chain line is a tangent at a point P having a height of 1 mm from the ground contact surface of the heel side wall surface 27. This point P is located on the cross-sectional curve of the side wall surface 27 of the heel that protrudes convexly toward the heel side. The angle formed by this tangent and the horizontal line G is the inclination angle θb of the heel side wall surface 27. Also in this sole, the inclination angle θb is preferably 30 ° or more and 70 ° or less. On the other hand, the toe side wall surface 25 inclination angle θa is preferably 50 ° or more and 90 ° or less. From the viewpoint of achieving both sliding performance and anti-slip performance, the difference (θa−θb) is preferably 10 ° or more, and more preferably 20 ° or more. If the difference (θa−θb) is excessive, an unintended slip in the toe direction tends to occur, and therefore the difference (θa−θb) is preferably 60 ° or less, and more preferably 50 ° or less.
[0027]
In the sole 17 as well, the height H of the horizontal streak 19 is preferably 1 mm or more and 8 mm or less. Also in the sole 17, the ratio (L2 / L1) is preferably 0.2 or more and 0.8 or less.
[0028]
Also in the sole 17, the ratio (μa / μb) between the friction coefficient μa and the friction coefficient μb is preferably 0.9 or less, and more preferably 0.7 or less, from the viewpoint of achieving both sliding performance and anti-slip performance. If the ratio (μa / μb) is too small, unintentional slip in the toe direction tends to occur, so the ratio (μa / μb) is preferably 0.3 or more, and more preferably 0.5 or more.
[0029]
FIG. 6 is a cross-sectional view showing a part of a sole 29 of a tennis shoe according to still another embodiment of the present invention. In this figure, the horizontal streak 31 and the base 33 are shown. In this figure, the left side is the toe side, and the right side is the heel side. The cross-sectional shape of the horizontal streak 31 is asymmetric. The horizontal streak 31 includes a grounding surface 35, a toe side wall surface 37, and a heel side wall surface 39. The ground surface 35 is curved. The grounding surface 35 is narrower than the grounding surface 11 of the horizontal streak 9 shown in FIG. Similar to the sole 5 shown in FIG. 2, the sole 29 includes a large number of horizontal stripes 31 arranged in parallel.
[0030]
Also in the sole 29, the inclination angle θa formed by the toe side wall surface 37 with respect to the horizontal plane is preferably 50 ° or more and 90 ° or less. On the other hand, the inclination angle θb formed by the side wall surface 39 with respect to the horizontal plane is preferably 30 ° or more and 70 ° or less. From the viewpoint of achieving both sliding performance and anti-slip performance, the difference (θa−θb) is preferably 10 ° or more, and more preferably 20 ° or more. If the difference (θa−θb) is excessive, an unintended slip in the toe direction tends to occur, and therefore the difference (θa−θb) is preferably 60 ° or less, and more preferably 50 ° or less.
[0031]
Also in this sole 29, the height H of the horizontal streak 31 is preferably 1 mm or more and 8 mm or less. Also in the sole 29, the ratio (L2 / L1) is preferably 0.2 or more and 0.8 or less.
[0032]
In the sole 29 as well, the ratio (μa / μb) between the friction coefficient μa and the friction coefficient μb is preferably 0.9 or less, and more preferably 0.7 or less, from the viewpoint of achieving both sliding performance and anti-slip performance. If the ratio (μa / μb) is too small, unintentional slip in the toe direction tends to occur, so the ratio (μa / μb) is preferably 0.3 or more, and more preferably 0.5 or more.
[0033]
FIG. 7 is a bottom view showing a sole 41 of a tennis shoe according to still another embodiment of the present invention. In FIG. 7, the upper side is the toe side, the lower side is the heel side, the right side is the outside, and the left side is the inside. The sole 41 is for the left foot. The sole for the right foot has a shape obtained by inverting the shape shown in FIG.
[0034]
The sole 41 includes a base 43, a large number of horizontal stripes 45, and a large number of vertical stripes 47. The horizontal stripe 45 and the vertical stripe 47 are formed integrally with the base 43 and protrude from the base 43. The horizontal streak 45 extends in the width direction (left-right direction in FIG. 7). The vertical streak 47 extends in the length direction (vertical direction in FIG. 7). The cross-sectional shape and dimensions of the horizontal stripes 45 are the same as the cross-sectional shape of the horizontal stripes 9 shown in FIG.
[0035]
FIG. 8 is an enlarged sectional view showing a part of the sole 41 of FIG. In FIG. 8, a vertical streak 47 is shown. In FIG. 8, the left side is the inside and the right side is the outside. As is apparent from FIG. 8, the vertical streak 47 includes a ground contact surface 49, an inside wall surface 51, and an outside wall surface 53. The inclination angle θc of the inside wall surface 51 with respect to the horizontal direction stands more than the inclination angle θd of the outside wall surface 53 with respect to the horizontal direction.
[0036]
A one-dot chain line CL1 shown in FIG. 7 is a center line in the length direction. A one-dot chain line CL2 is a center line in the width direction. Of the bottom surface, the area above the center line CL1 and the right side from the center line CL2 is a toe side from the center in the length direction and an outside area from the center in the width direction. A horizontal streak 45 is mainly formed in this region. Specifically, the ground contact area of the horizontal streak 45 occupying the ground contact area of all the streaks 45 and 47 included in this region is 50% or more, particularly 70% or more. This region is a region where a large load is applied and the muscle peaks 45 and 47 are deformed when the player moves forward by kicking the ground and sliding the tennis shoes while moving forward. By mainly forming the horizontal streak 45 in this region, both slide performance and anti-slip performance are achieved.
[0037]
Of the bottom surface, the area above the center line CL1 and the left side from the center line CL2 is a toe side from the center in the length direction and an inside area from the center in the width direction. A vertical streak 47 is mainly formed in this region. Specifically, the ground contact area of the vertical streak 47 occupying the ground contact area of all the streaks 45 and 47 included in this region is 50% or more, particularly 70% or more. This area is an area where a large load is applied when the player changes direction. By forming the vertical streak 47 mainly in this region, the slip prevention performance at the time of changing the direction is enhanced. The outside wall surface 53 mainly contributes to the improvement of the anti-slip performance. Due to the gradual inclination of the outside wall surface 53, when a load is applied, the area of the ground contact surface 49 increases on the outside wall surface 53 side in the vertical streak 47. The ground contact surface 49 having an increased area increases the frictional force of the ground contact. This large frictional force contributes to the improvement of the anti-slip performance.
[0038]
The inclination angle θc formed by the inside wall surface 51 with respect to the horizontal plane is preferably 50 ° or more and 90 ° or less. On the other hand, the inclination angle θd formed by the outside wall surface 53 with respect to the horizontal plane is preferably 30 ° or greater and 70 ° or less. From the viewpoint of anti-slip performance, the difference (θc−θd) is preferably 10 ° or more, and more preferably 20 ° or more. The difference (θc−θd) is preferably 60 ° or less, and more preferably 50 ° or less.
[0039]
The height H of the vertical streak 47 is preferably 1 mm or more and 8 mm or less. The ratio (L4 / L3) of the distance L4 of the ground contact surface 49 to the distance L3 of the boundary portion between the base 43 and the vertical stripe 47 is preferably 0.2 or more and 0.8 or less.
[0040]
Also in this sole 41, from the viewpoint of achieving both sliding performance and anti-slip performance, the ratio (μa / μb) between the friction coefficient μa and the friction coefficient μb is preferably 0.9 or less, and more preferably 0.7 or less. If the ratio (μa / μb) is too small, unintentional slip in the toe direction tends to occur, so the ratio (μa / μb) is preferably 0.3 or more, and more preferably 0.5 or more.
[0041]
Also in the sole 41, the ratio of the total area of all the ground planes to the projected area of the bottom surface is preferably 15% or more and 70% or less. When the ratio is less than the above range, the ground contact surface is likely to be worn. From this viewpoint, the ratio is more preferably 25% or more. When the ratio exceeds the above range, the anti-slip performance may be insufficient. From this viewpoint, the ratio is more preferably 60% or less.
[0042]
【Example】
Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.
[0043]
[Example 1]
A rubber composition based on a styrene-butadiene copolymer was put into a mold, and a crosslinking reaction was caused to the rubber to obtain a sole (outsole). The pattern on the bottom of the sole is shown in FIG. A large number of transverse muscle mountains are formed on the sole. The inclination angle θa of the horizontal streak is 90 °, the inclination angle θb is 30 °, the height H is 3 mm, and (L2 / L1) is 0.25. A tennis shoe of Example 1 was obtained by attaching a midsole made of an ethylene vinyl acetate copolymer and an upper made of cotton to the sole.
[0044]
[Examples 2 to 3 and Comparative Examples 1 to 2]
Tennis shoes of Examples 2 to 3 and Comparative Examples 1 to 2 were obtained in the same manner as Example 1 except that the molding die was changed to form a sole having a horizontal streak of the shape shown in Table 1 below. It was.
[0045]
[Example 4]
A tennis shoe of Example 4 was obtained in the same manner as in Example 1 except that the molding die was changed to form a sole having a horizontal stripe and a vertical stripe having the shapes shown in Table 1 below. This sole pattern is shown in FIG.
[0046]
[Practical test]
A player wears tennis shoes and has a tennis rally on a hard court. The ease of direction change, anti-slip performance at the start, slide performance, and leg fatigue were evaluated in five stages from “1” to “5”. The highest evaluation was given as “5”. The average rating of 10 players is shown in Table 1 below.
[0047]
[Table 1]

[0048]
As shown in Table 1, the outsole of each example has good evaluation results in all items. From this result, the superiority of the present invention is clear.
[0049]
【The invention's effect】
As described above, the tennis shoe of the present invention is excellent in both slip prevention performance and slide performance. This tennis shoe can contribute to improving the player's performance.
[Brief description of the drawings]
FIG. 1 is a side view showing a tennis shoe according to an embodiment of the present invention.
FIG. 2 is a bottom view showing the tennis shoe of FIG. 1;
FIG. 3 is a perspective view from below showing a part of the sole of FIG. 2;
FIG. 4 is an enlarged cross-sectional view showing a part of the sole of FIG. 2;
FIG. 5 is a cross-sectional view showing a part of a sole of a tennis shoe according to another embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a part of a sole of a tennis shoe according to still another embodiment of the present invention.
FIG. 7 is a bottom view showing a sole of a tennis shoe according to still another embodiment of the present invention.
FIG. 8 is an enlarged cross-sectional view showing a part of the sole of FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tennis shoes 3 ... Upper 5, 17, 29, 41 ... Sole 7, 21, 33, 43 ... Base 9, 19, 31, 45 ... Yokosuji mountain 11, 23, 35 , 49 ... grounding surfaces 13, 25, 37 ... toe side wall surfaces 15, 27, 39 ... heel side wall surface 47 ... vertical streak 51 ... inside wall surface 53 ... outside wall surface

Claims (5)

  It has a large number of horizontal stripes juxtaposed on the bottom surface, and this horizontal stripe has a grounding surface, a toe side wall surface and a heel side wall surface continuous to the grounding surface, and an inclination angle θa of the toe side wall surface is 踵When the friction coefficient is measured on the hard coat, the ratio of the friction coefficient μa in the toe direction to the friction coefficient μb in the heel side direction (μa / μb) is 0. Tennis shoes that are 3 or more and 0.9 or less.   2. The tennis shoe according to claim 1, wherein a difference (θa−θb) between the inclination angle θa of the toe side wall surface and the inclination angle θb of the heel side wall surface is 10 ° or more and 60 ° or less.   The tennis shoe according to claim 1 or 2, wherein a height of the horizontal streak is 1 mm or more and 8 mm or less.   It further includes a vertical streak extending in the length direction, and a lateral streak is mainly formed in a region of the bottom surface that is closer to the toe side than the center in the length direction and outside the center in the width direction. 4. The tennis shoe according to claim 1, wherein a vertical streak is mainly formed in a region closer to the toe than the center in the length direction and inside the center in the width direction. The ratio of the distance of the grounding surface to the distance of the boundary portion between the bottom surface and the horizontal streak is 0.25 or more and 0.75 or less. 1 Tennis shoes as described in the section.

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