JPH0919516A - Ball for ball game - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the soft touch while keeping the capacity as a ball, in a ball for a ball game having a skin layer formed by sewing the peripheries of leather panels, by curving the sewing lines formed along the peripheries of the leather panels toward the centers of the leather panels. SOLUTION: The skin layer 5 of a soccer ball 4 consists of, for example, 20 equilateral hexagonal leather panels 6 and 12 equilateral pentagonal panels 7 and the peripheries of the leather panels 6, 7 are folded inside to be sewn by yarn to be formed into a spherical shape as a whole. Packing layers composed of cloth are bonded to the rear surfaces of the leather panels 6, 7 and compressed air is sealed in the hollow spherical rubber tube housed in the skin layer 5. When the leather panels 6, 7 are sewn by yarn, the corner parts where the sides of three leather panels 6, 6, 7 cross each other are largely depressed toward the center of the ball and deep cavities are formed at a region where three grooves formed to stitches cross each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball game ball such as a soccer ball, and more particularly to a ball game ball having a sewing structure.

[0002]

2. Description of the Related Art Balls for soccer, such as soccer balls, can be roughly classified into two types, sewn balls and pasted balls, due to the difference in their structures. The sewn ball refers to a ball having a structure in which a plurality of leather panels forming a skin layer are sewn together, and the attached ball refers to a ball having a structure in which a plurality of leather panels are attached to a ball base. In general, a sewn ball has a deep groove on the seam, which makes the ball easier to grip, that is, easier to hold when holding it in the hand, ball controllability at the time of kicking a ball, and excellent flight distance. There is an advantage that the impact at the time of hitting the body or at the time of kicking is suppressed. Therefore, recently, sewing balls are becoming more widely used. The leather panel constituting the surface layer means a natural leather, artificial leather or other leather-like panel.

A soccer ball having a sewn structure is disclosed in, for example, Japanese Utility Model Publication No. 5-10833. FIG. 4 shows one regular hexagonal leather panel 1 which constitutes the surface layer of a soccer ball of the related art, and its periphery is provided with small holes 2, 2 ,. Multiple .. are formed. Threads are threaded through the small holes 2, 2, ... And the adjacent leather panels 1 are sewn together to form a spherical shape as a whole, and a spherical hollow rubber tube is housed inside. Usually, the suture line 3 connecting the small holes 2, 2, ... Is formed in a straight line parallel to one side of a regular hexagon as shown in the above-mentioned publication. A structure is also known in which the suture line 3 is curved to the outside of the leather panel 1 (actual flat blade 51-4.
5461 publication).

[0004]

Generally, in a sewn ball, the ball performance and the softness of touch are contradictory characteristics. That is, in the structure disclosed in the above-mentioned publication (Jpn. Pat. Appln. KOKAI Publication No. 5-10833), if it is attempted to improve the ball performance such as grip, controllability, and flight distance, it is formed on the seam of the leather panel in order to increase the unevenness of the ball surface. It is necessary to deepen the groove. In order to achieve this, it is conceivable to use a hard leather panel or thick sewing thread, but this makes the feel of the ball hard and the impact is great when it hits the body and it hurts. There is. On the other hand, when a soft leather panel is used to soften the feel, the groove becomes shallow and the ball performance is deteriorated.

When the suture line is curved to the outside of the panel as disclosed in the publication (Japanese Utility Model Publication No. 51-45461),
The skin layer becomes more spherical and the surface irregularities become smaller,
Therefore, ball performance is further reduced.

The present invention has been made in order to solve such a problem, and realizes a ball for ball game which has a soft feel while maintaining the performance as a ball.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a spherical hollow rubber tube in which compressed air is enclosed, and a skin layer formed by stitching the periphery of a plurality of polygonal leather panels to cover the tube. In a ball for ball game including, a suture line formed along the periphery of the leather panel is curved toward the center of the leather panel.

Further, in the present invention, the curvature of the suture line can be set substantially equal to the curvature of the surface of the ball for ball game.

Further, in the present invention, the above skin layer is
A soccer ball can be constructed by stitching together 0 hexagonal leather panels and 12 pentagonal leather panels.

[0010]

[Operation] Since the stitching line of the leather panel is curved toward the center of the panel, when the leather panels are sewn together, the overall shape is kept spherical, but the indentation of the groove at the polygonal corner portion becomes large, Therefore, the unevenness of the skin layer becomes large.

[0011]

EXAMPLES In FIGS. 1 and 2, 4 indicates a soccer ball, and a skin layer 5 comprises 20 regular hexagonal leather panels 6,
6 ... and 12 regular pentagonal leather panels 7, 7 .... The leather panels 6 and 7 have their peripheries bent inward and sewn together with threads 8 to form a spherical shape as a whole. 9 is a groove formed in the seam of the leather panels 6 and 7. A backing layer 10 made of cloth is adhered to the back surfaces of the leather panels 6 and 7. Reference numeral 11 is a hollow spherical rubber tube housed in the skin layer 5 and is filled with compressed air.

FIG. 3 shows a hexagonal leather panel 6, and in the case of a No. 5 size soccer ball (diameter of about 22 cm), a panel having a side length QR = 48.4 mm is used, and 2.5 mm (d1) inside thereof is used. A seam side ST (a straight line with a length of 44.4 mm, shown by a broken line in the figure) is provided. S and T are points on the straight line OQ, OR. a,
b, c, d, e, f, g, and h are eight small holes for suturing having a diameter of about 1 mm, which are formed by bending from the seam side ST toward the center of the panel 6. A curve (indicated by a one-dot chain line) connecting the small holes a, b, c, d, e, f, g, h is called a suture line 12. Here, the small hole a is the seam side ST
It is located 4.7 mm (d2) to the right in the figure above point S. The small holes b, c, d are located closer to the panel center O side than the seam side ST. The small holes a, b, c, d, e, f, g, h are arranged symmetrically with respect to a straight line OP that connects the center O of the panel 6 and the center P of the side. That is, the small holes a and h, the small holes b and g, and the small holes c and d and the small holes e and f are at the target positions. Here, the small holes c, d, e, f are arranged on the same straight line. When the small holes d and e are arranged on the panel center O side with respect to the small holes c and f, the thread 8
This is because the seam between the small holes d and e may open when stitched with (Fig. 2). However, considering the use of a particularly soft leather panel, the small holes d, e are replaced by small holes c,
It is also possible to place it on the panel center O side with respect to f. In the above example, the distance between the small holes a, b, and c in the linear OP direction (d3)
Is 0.5 mm each and the space between small holes a, b, c, d, e, f, g, h (d4)
Can be 5 mm. The pentagonal leather panel 7 also has similar small holes. With this structure, when the leather panels 6, 7 ... Are sewn together with the thread 8,
The corners where the sides of the three leather panels 6, 6 and 7 intersect form a large depression toward the center of the ball.

In the above embodiment, the suture line 12 has a trapezoidal upper base and left and right inclined sides. The suture line 12 is
In addition to the trapezoidal curve described above, a circular curve may be used, and these curves are included in the meaning of the term "curvature". The curvature of the suture line 12 is set to a value equal to or close to the curvature of the surface of the soccer ball 4 as a reference. This is because if the value is smaller than this value, the ball performance is hardly improved, and if it is larger than this value, irregular bouncing or the like may occur or the seam may be easily opened. Further, the number of small holes is generally 8 per side of a leather panel for a No. 5 size soccer ball, but there are also 9 small holes. Also, the number of No. 4 size balls is about 8 to 9. As the hole for suturing, a slit having a length of 2 to 3 mm can be used instead of the circular small hole as described above.

Clay is filled in the groove 9 at the seam portion of the soccer ball 4 having the above structure to form a true sphere so that the center O of the leather panels 6 and 7 appears on the surface, and the volume of the groove 9 determines the total volume of the groove 9. When measured, it was about 100 cm ³ . For comparison, the ball 9 of the conventional structure (the same size, the same leather panel is used, and the stitch line is a straight line) is measured and the volume of the groove 9 is about 60 cm ³ . Further, the difference between the circumference of the true sphere passing through the center O of the panels 6 and 7 and the circumference passing through the bottom of the groove 9 was 14 mm in the above-mentioned embodiment and about 9 mm in the conventional example.
From this, it is understood that the groove 9 of the example ball is larger and deeper than the conventional ball.

Next, as an experiment relating to the tactile sensation during collision between the example ball and the conventional example ball, the ball was held at a constant height (1 m).
The sample was allowed to fall naturally and the impact value was measured. As a result, the impact value of the example ball was 60.8 kgf, and the impact value of the conventional example ball was
It is 65.4 kgf, and it can be seen that the ball of Example has a smaller impact value and a softer feel when hitting a human body. It was also confirmed that the difference in impact value is a difference that can be perceived by human senses.

In the above embodiment, a soccer ball having a basic structure of a quasi regular hexahedron composed of 20 regular hexagons and 12 regular pentagons has been described.
The present invention can also be applied to a soccer ball having a basic structure of a regular regular polyhedron or a regular regular polyhedron or a regular regular polyhedron made of a combination of polygons. Further, the present invention is not limited to a soccer ball, but is also effective when used for a sewn ball whose surface layer is a polygonal leather panel, for example, a handball.

[0017]

According to the ball for ball game according to the present invention, a deep recess is formed at a portion where three grooves formed in a seam intersect by bending a suture line provided around a leather panel toward the center of the panel. It is formed. It was confirmed that the irregularities on the surface of the ball became larger, the grip and controllability were improved, and the flight distance was extended. In addition, the above-mentioned depressions are regularly arranged uniformly on the surface of the ball, and the depth thereof is set so as not to affect the movement of the ball. Therefore, the ball is irregularly bound or irregularly flies. There is no fear.

Further, according to the present invention, since the unevenness of the surface layer is large, it is possible to suppress the impact at the time of collision with a human body,
In addition, even if a soft leather panel is used, the deep groove is maintained, so it is possible to use soft leather that could not be used because it impairs ball performance such as grip, which makes it more comfortable to touch, safer and more competitive. It is possible to realize a ball for a ball game that can withstand the technique.

[Brief description of the drawings]

FIG. 1 is a front view of a ball for ball game according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing a hexagonal leather panel.

FIG. 4 is a plan view showing a conventional leather panel.

[Explanation of symbols]

 1,6,7 ………… Leather panel 2, a, b, c, d, e, f, g, h ……… Small hole 3,12 ……… Suture line 4 ……… Soccer ball 5 ……… Skin layer 8 ………… Thread 9 ……… Groove 10 ……… Backing layer 11 ……… Tube

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Atsushi Yamaguchi 1-8 Yokomachi Shinmachi, Nishi-ku, Hiroshima City Morten Co., Ltd.

Claims (3)

[Claims] 1. A ball game ball comprising a spherical hollow rubber tube in which compressed air is enclosed, and a skin layer formed by stitching the periphery of a plurality of polygonal leather panels to cover the tube. A ball for ball game, wherein a suture line formed along the periphery of the leather panel is curved toward the center of the leather panel. 2. The ball for ball game according to claim 1, wherein the curvature of the suture line is set to be substantially equal to the curvature of the surface of the ball for ball game. 3. The ball for ball games according to claim 1, wherein the skin layer is a soccer ball formed by stitching 20 hexagonal leather panels and 12 pentagonal leather panels together.