JP2000000329A - Ball for ball game - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball for a ball game further improved in softness as the whole ball in combination with the center part softness of leather panels while improving balance as a whole by heightening the deformation freedom of sewn parts so as to make the sense of touch of these parts soft and reducing the difference of softness between the sewn parts and non-sewn parts. SOLUTION: This ball for a ball game is provided with a rubber tube of a spherical hollow body filled with compressed air, and a skin layer 4 containing this tube being formed in spherical shape by folding the peripheries of a plurality of leather panels 5 and 6 inward and sewing the folded parts together with a thread. In this case, slits almost vertical to the sides of the leather panels 5 and 6 are formed at the folded parts of the leather panel parts 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a soccer ball,
The present invention relates to a ball for a ball game such as a handball and a volleyball, and particularly to a ball for a ball game having a sewing structure.

[0002]

2. Description of the Related Art Conventionally, there are two types of ball for ball games of this kind of air-enclosed structure, a pasted ball and a sewing ball.

The pasted ball is disclosed in, for example, US Pat.
As shown in the specification of Japanese Patent No. 33,648, a spherical hollow rubber tube made of an air-impermeable rubber and filled with compressed air through a valve, and a nylon filament on this tube for several thousands m A reinforcing layer formed by being wound in the circumferential direction, for the purpose of stabilizing the quality (weight, size, sphericity, durability, maintainability of sphere, strength against aging) as a ball, and this reinforcing layer The cover rubber layer is formed by a vulcanized rubber thin layer adhered thereon, and the skin layer is formed by a plurality of leather panels adhered on the cover rubber layer. The cover rubber layer has a function of strongly bonding the leather panel to the ball. As the leather panel, an artificial leather or a natural leather panel is used. Normally, the rear end of the leather panel is cut off diagonally (referred to as edge cutting), and a substantially V-shaped groove is formed at the joint of the leather panel.

In the ball having such a structure, the groove at the panel joint is wide (typically about 8 mm) and shallow (typically about 1 mm).
mm), there is a problem that the aerodynamic resistance does not decrease and the flight distance does not increase. In addition, there is also a problem that it is difficult to grasp because of poor grip.

[0005] A sewing ball is formed by folding a plurality of leather panels with their edges inwardly and forming a sewing thread (usually about 1000 pieces).
A tube similar to that described above was housed in a spherical skin layer sewn with a 0 denier thread). As the leather panel, the same artificial leather or natural leather as described above is used, and a backing material formed by laminating a plurality of woven fabrics is usually adhered to the back surface thereof. That is, these woven fabrics are adhered to the back surface of the leather panel with an adhesive such as latex lake to reinforce the leather panel.

In the ball having such a structure, since the panel joining portion is folded inward, the groove formed in this portion has a width of about 2.5 mm and a depth of about 1.5 mm. And the width is small and deep. Therefore,
There are advantages in that the air resistance is reduced, the jump distance is increased, and the grip properties, that is, the ease of gripping when held in the hand, and the ball control properties are excellent. Further, the packing material plays a role of a reinforcing layer in the above-mentioned pasted ball, but has an advantage that it is softer than a reinforcing layer such as a bobbin, so that an impact when the ball collides with a human body can be reduced. Therefore, there is a tendency for sewing balls to be generally preferred.

A proposal has been made to further soften the feel of a sewn ball. For example, a structure in which a foam (foaming material) layer is added to the back surface of a leather panel in addition to a backing material as an impact buffer layer is known. .

[0008]

In a sewing ball, each of the leather panels is easily deformed and soft by itself, but when a plurality of leather panels are folded around the periphery and stitched, the sewn portion becomes hard. Problem. That is, the folded portion around the leather panel functions to prevent deformation of the ball when an external force is applied to the ball. For example, in the case of a soccer ball, the skin layer is formed by 12 pentagonal leather panels and 20 hexagonal leather panels (constituting a quasi-regular 32 face), and the suture lines form a closed circuit and Since it covers the spherical surface evenly, this is a major factor in making the ball less deformable and thus giving a hard feel.

When the ball is kicked, each leather panel is smaller than the foot surface hitting the ball,
The foot will always hit both the stitched and non-stitched portions unevenly, and the difference in hardness may have a subtle effect on ball control.

In a structure in which an impact buffer layer such as a foam is interposed on the back surface of the leather panel, the feel of the leather panel itself is softened, but the hardness of the sewn portion is not improved. However, the deformation when the outside is applied is distorted, the mechanical balance of the whole ball is deteriorated, and the sewing strength decreases over time because the soft impact buffer layer is sewn with sewing thread. This causes problems such as expansion of the ball. Further, in order to add an impact buffer layer, it is necessary to reduce the number of woven fabrics of the backing material by about one, which causes a problem that durability is deteriorated.

According to the present invention, by increasing the degree of freedom of deformation of a sewn portion, the feel of the sewn portion is softened, the difference in softness between the sewn portion and the non-sewn portion is reduced, and the overall balance is improved. It is an object of the present invention to provide a ball for ball game in which the softness of the ball as a whole is further improved in combination with the softness of the central portion of the panel.

[0012]

According to a first aspect of the present invention, there is provided a ball for ball games, wherein a spherical hollow rubber tube filled with compressed air and a plurality of leather panels are folded inwardly. In a ball game ball comprising a skin layer in which the folded portion is sewn with sewing thread and formed into a spherical shape and including the tube, the folded portion of the leather panel portion is substantially perpendicular to a side of the leather panel. It is formed with a notch. With such a structure, the sewn portion of the adjacent leather panel is easily deformed in the direction perpendicular to the ball surface due to the cut formed in the fold. This softens the feel when the human body hits the suture portion of the leather panel.

[0013] In a ball for ball games according to a second aspect of the present invention, a backing material made of a woven fabric is adhered to the back surface of the leather panel, and the cuts are formed also in the backing material. is there. With such a structure, the leather panel is reinforced by the backing material and improves the durability of the ball.

According to a third aspect of the present invention, there is provided a ball for ball games, wherein the leather panel has a polygonal shape, and a folding line of a folding portion of the leather panel is set to a curved line curved outward. Things. With such a configuration,
The leather panel after suturing can be made into a natural sphere, and even if the leather panel is folded into a curved line due to the presence of the cut, it can be folded without difficulty.

[0015]

1 to 3, reference numeral 1 denotes an example of a soccer ball, and reference numeral 2 denotes a tube formed of a spherical hollow body made of an air-impermeable elastic material such as butyl rubber. Is enclosed. Reference numeral 3 denotes a valve for injecting compressed air into the tube 2, which is set to an internal pressure of about 1.0 kg / cm ² . Reference numeral 4 denotes a skin layer for accommodating the tube 2, and 12 regular pentagonal leather panels 5, 5, ‥‥‥ and 20 regular hexagonal leather panels 6, 6,
Consists of ‥‥‥.

The peripheries of the leather panels 5 and 6 are bent inward to form a fold 7 and are sewn together with a sewing thread (about 10,000 denier) 8 to expand a spherical (quasi-regular 32) body as a whole. (Spherical shape). The sewing thread 8 is sewn through the sewing thread 8 into slit-like sewing holes 9, 9, ‥‥‥ formed around the leather panels 5, 6. Here, natural leather or artificial leather is used as the leather panels 5 and 6. Sewing holes 9,
9 and ‥‥‥ are simultaneously drilled when the leather panels 5 and 6 are cut. In the case of a No. 5 size ball, these sewing holes 9, 9, ９ are usually 7 to 7 per side of the leather panels 5, 6.
Nine are formed. The distance between the sides of the leather panels 5, 6 and the sewing holes 9, 9, ‥‥‥ is about 3 mm.

Reference numeral 10 denotes a backing material adhered to the back surfaces of the leather panels 5 and 6 to reinforce them, and is constituted by bonding four woven fabrics. As the woven cloth, a cotton cloth or a mixed spinning cloth of cotton and polyester can be used. This woven fabric is
Depending on the thickness and strength of the leather panel, the thickness and strength of the woven fabric,
One or more sheets are used, but usually 3 to 4 sheets. These woven fabrics are bonded with a latex-based adhesive. The woven fabric has a continuous corrugated structure in which a sewing thread and a weft thread cross each other, and the upper and lower sides of the other thread are mutually wiped. The backing material 10 has the same shape as the leather panels 5 and 6 and is independent for each of the leather panels 5 and 6. Also, the woven fabric has a bias effect and has a function of absorbing impact.
The bias effect refers to an effect that shows a large expansion and contraction when the woven fabric is pulled in a direction at an angle such as a 45 degree direction with respect to the warp and the weft. Therefore, it is excellent in the expansion and contraction effect upon impact.

11, 11, ‥‥‥ are leather panels 5, 6
V-shaped cuts formed in the peripheral folds 7, 7,... Are provided in a direction perpendicular to the sides of the leather panels 5, 6. The cuts 11, 11, ‥‥‥ have a depth not reaching the sewing holes 9, 9, ‥‥‥, for example, a distance of 3 mm from the edges of the leather panels 5, 6 to the sewing holes 9, 9, ‥‥‥. , It is formed at a depth of about 2.5 mm. In the example shown in FIG. 3, the cuts 11, 11,.
Are formed between the apex angle and the sewing holes 9, 9, ‥‥‥, but the number thereof can be increased or decreased as appropriate. However, the cut 11,
The positions 11 and ‥‥‥ are desirably provided between the sewing holes 9, 9 and か ら from the viewpoint of maintaining the strength of the leather panel. Further, since the corner portions of the leather panels 5 and 6 are the hardest, it is desirable to form cuts 11, 11, and. In addition, the shape of the cuts 11, 11, and ス リ ッ ト may be a slit shape or a shape having a predetermined width, in addition to the V-shape. These cuts 11, 11, ‥‥
‥ is formed on all sides of all the leather panels 5, 6, ‥‥‥.

With the above structure, when an external force is applied to the ball, the ball is deformed as if crushed.
At this time, the cuts 11, 11, 部分
‥ opens in a V-shape and the suturing portion is bent. Therefore, the degree of deformation is large, the shock absorbing effect is increased, and the feel is softened.

Next, from the viewpoint of durability, the durability of the ball is such that the sewing thread 8 is pulled from the sewing holes 9, 9, ‥‥‥ toward the edges of the leather panels 5, 6 by the internal pressure of the tube 2. It is expressed by the force that blocks the force that is applied. In the ball according to the present invention, the cuts 11, 11,.
Is located outside and in the middle of the sewing holes 9, 9,. Therefore, the durability of the ball is not inferior to the conventional ball.

In the above embodiment, a case where the present invention is applied to a soccer ball has been described. However, such a structure can be applied to other ball for ball games, for example, a handball and a volleyball. Formed. Also in this strip-shaped panel, the folding line is curved outward or inward so as to follow the spherical shape.

[0022]

According to the ball for ball games according to the first aspect of the present invention, since the degree of freedom of deformation of the sewn portion is increased, when a shock is applied, the ball largely deforms to absorb and reduce the shock. Thus, the feel when the ball hits the human body can be softened. Also, since the difference in softness between the sewn and non-sewn portions of the leather panel can be reduced, even if any part of the ball is kicked, the movement can be uniform and the mechanical properties of the ball The balance can be improved. As a result, the controllability of the ball is increased, and a ball that can make full use of advanced technology can be realized.

According to the ball for ball games of the second aspect of the present invention, the sewing thread sew the leather panel and the backing material together, and the sewing strength is large and does not become warm over time, so that the durability is impaired. A soft ball with a soft touch can be realized.

According to the ball for ball games of the third aspect of the present invention, since a natural sphere can be formed, the difference in softness between different portions of the ball surface can be minimized, and the mechanical balance of the ball can be minimized. And a high-quality ball that can withstand advanced competition techniques can be realized.

[Brief description of the drawings]

FIG. 1 is a front view showing 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 the surface of the leather panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soccer ball 2 Tube 3 Valve 4 Skin layer 5, 6 Leather panel 7 Folding part 8 Sewing thread 9 Slit 10 Backing material 11 Cut

Claims (3)

[Claims] 1. A rubber tube of a spherical hollow body filled with compressed air and a plurality of leather panels are folded inward, and the folded portion is sewn with a sewing thread to form a spherical shape. A ball game ball comprising a built-in skin layer, wherein a notch substantially perpendicular to a side of the leather panel is formed in a folded portion of the leather panel portion. 2. The ball for ball games according to claim 1, wherein a backing material made of a woven cloth is adhered to the back surface of the leather panel, and the cut is formed also in the backing material. 3. The ball for ball games according to claim 1, wherein the leather panel has a polygonal shape, and a folding line of a folding portion of the leather panel is set to a curved curve.