JPH06292741A - Ball for ball game - Google Patents

Abstract

PURPOSE:To provide a ball for a ball game concurrently having durability and soft feeling. CONSTITUTION:Nylon or polyester fibers are wound on the surface of a spherical hollow tube 1 sealed with compressed air into the endless track shape to form a thread-wound reinforcing layer 2. The thread weight of the reinforcing layer is set within the range of 0.1-5(g). A leather panel or a rubber surface layer 3 is stuck and formed to the outside of the reinforcing layer 2 directly or via a rubber center sill layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball for a ball game such as a volleyball or a soccer ball, which has a soft feeling when hitting a hand or a leg.

[0002]

2. Description of the Related Art Conventionally, volleyballs, soccer balls,
The following structures are widely adopted for ball games such as dodge balls. That is, a spherical hollow rubber tube in which compressed air is enclosed, and a reinforcing layer formed by winding nylon or polyester monofilament of 100D (denier) to 200D on an endless track of about 3000 to 4000 m on the surface of the tube. It is composed of a leather panel and a rubber skin layer, which are directly adhered to the reinforcing layer via a rubber-clad layer. The ball having such a structure is adopted in a game ball such as volleyball or soccer in which trained players compete.

On the other hand, recently, a game called soft volleyball, which uses a volleyball having a high elasticity and made of a single layer of rubber having a thickness of about 1 mm, is becoming popular mainly with children, women and the elderly. Such a soft volleyball is a fluffy and extremely soft ball, and even if it hits the body, it hardly causes pain, so it can be used with peace of mind even for physically weak people.

[0004]

The ball for ball game having the above-mentioned wound-fiber reinforcing layer has excellent spherical stability and durability, but has a problem that it is painful when it hits a hand, arm, leg or the like because it is hard. Yes, it is not suitable for elementary school students, women, or beginners.

On the other hand, it is not uncommon for the above-mentioned soft volleyball consisting of only a rubber layer to be deformed and enlarged by about 10% after being used for several hours, and the air pressure is set to about 0.05 Kg / cm ² which is suitable for soft valley competition. Even if they are abnormally inflated or stacked in a storage basket,
There is a problem that the lower layer balls are inferior in durability such as being deformed or damaged due to heavy pressure. In addition, the ball having such a structure usually has a static growth rate of about 2.0%, which causes a problem of poor durability. Here, the static growth rate is based on the circumference of a ball with a pressure of 0.025 kgf / cm ² ,
It is the enlargement ratio (circumference) when the internal pressure is increased to 0.05 kgf / cm ² , and the reinforcing effect can be evaluated by this static growth rate.

The present invention has been made to solve such a problem, and provides a ball for ball game which has a soft feeling when hitting a hand, a leg or the like and has a shape maintaining property.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to a spherical hollow rubber tube in which compressed air is enclosed, a thread winding reinforcing layer formed by winding nylon or polyester fibers on the surface of the tube, and the thread winding reinforcing layer. In a ball for ball game comprising a leather panel or a rubber skin adhered directly on or through a rubber layer, the bobbin reinforcing layer has a weight of 0.1 g.
It is set within the range of 5 to 5 g.

[0008]

[Function] The wound-fiber reinforcing layer formed by winding nylon or polyester fiber on the surface of the tube so that the weight is within the range of 0.1 to 5 g makes the ball larger.
It suppresses permanent deformation within a range that does not interfere with ball games, and maintains a soft feeling upon impact on the human body.

[0009]

[Example] In FIG. 1, reference numeral 1 denotes a circumference of 640 mm and a thickness of 0.5.
mm butyl rubber tube, 2 is a thread wound reinforcement layer formed on the surface of the tube 2 and has a thickness of about 0.5 mm, and 3 is a tube wound reinforcement layer 2 formed on the surface of the tube 2 and has a thickness of about 0.5 mm. It is a rubber skin layer. The bobbin reinforcing layer 2 is made of 18D nylon monofilament wound on a 1363 m endless track, and its weight is 2.73.
It is g. In such a soft volleyball, compressed air is enclosed in the tube 1 through a valve (not shown) so that the internal pressure becomes 0.05 Kgf / cm ² . The total weight of the balls is 145 g.

The static growth rate of the ball having the above structure is 0.24%,
The impact force was 17.3 Kgf. Here, the impact rate is 1 m
It means the impact force when it falls from the height of. Normally, if the static growth rate is 1.0% or less in a ball with an internal pressure of 0.05 Kgf / cm ² , it has almost no effect on the competition, and the growth within this range is based on the ball standard (regulated by the Japan Volleyball Association). ) It fits inside. Further, if the impact force is 20 Kgf or less, it can be said that the feeling is soft, and this is obtained as a result of the field test by the inventors.

FIG. 2 shows the change in the growth rate when the number of thread windings of the ball having the above-mentioned structure, that is, the weight of the thread is changed. In order to achieve a growth rate of 1.0% or less, a minimum of 0.1 g of thread is required. It turns out that By the way, it is about 1 in the conventional volleyball with a bobbin structure.
8g, 33g of a soccer ball is wound.

Similarly, FIG. 3 shows a change in impact force when the yarn weight of the ball having the above-mentioned structure is changed, and it is understood that in order to obtain an impact force of 20 Kgf or less, the maximum yarn weight is 5 g or less. As described above, the yarn weight is preferably in the range of 0.1 g to 5 g from the relation of yarn weight-growth rate and yarn weight-impact force. In the figure, V indicates a conventional volleyball, and S indicates a soccer ball value.

FIG. 4 shows the relationship between the internal pressure and the growth rate. Curves A, B, and C show soft volleyballs having a wound-fiber reinforcing layer formed by winding nylon monofilaments of 100D, 18D, and 50D for 36,000 Dsec. Show. Here, D · sec is a unit showing the amount of wound thread, and the result of winding 18D nylon monofilament for 2000 seconds is displayed as 36,000 D · sec. 50D as well
720 seconds for the thread and 360 seconds for the 100D thread. 36,0
00D · sec is 2.73 g, and the weights of the three types of nylon monofilaments having different thicknesses are the same. As shown in the figure, the curves A, B, and C are substantially the same curve, which indicates that only the yarn weight is related to the growth rate regardless of the yarn thickness. The growth rate of the ball according to the embodiment of the present invention represented by the above curves A, B, and C is about 0.25% (internal pressure 0.05 Kg / cm.
^{It is 2} o'clock) and there is no problem in competition. Curves D and E in the figure are 18D nylon monofilaments with a winding amount of 11,000D · se.
The thread weight is 0.835.
g and 0.380 g. These balls have an internal pressure of 0.05 Kg
The growth rate is about 0.5% and 0.75% near / cm ² , which is included in the present invention as a softer ball. Curve F is made of 18D nylon monofilament with a winding amount of 1300D · sec,
It shows the characteristics of a ball with a yarn weight of 0.10 g and an internal pressure of 0.05 kgf / cm ²
Indicates a growth rate of 1.0%. This ball is also within the scope of the example. Curve V is the conventional example volleyball (thread weight 18
g, 100D, 215 × 10 ³ D · sec), and the curve S is a conventional soccer ball (thread weight 33 g, 140D, 392 × 10 ³
D · sec) is shown. A curve G shows the characteristics of a conventional soft volleyball consisting of only a rubber layer.

FIG. 5 shows the relationship between the internal pressure and the impact force, and the curves A, B and C are 100D, 18D and 50 as in the above example.
3 shows a soft volleyball with each nylon monofilament of D having a yarn weight of 36,000 D.sec. Also in this figure, the curves A, B and C form a single line, which shows that the impact force is also independent of the yarn thickness and only on the yarn weight. Curves D, G, V and S similar to the ball impact force-internal pressure curve corresponding to the curves D, G, V and S shown in FIG. 4 are shown. Balls represented by curves A, B, and C have an internal pressure of 0.05 kg.
The ball represented by the curve D exhibits an impact force of about 15 kgf at f / cm ^{2 and} an impact force of about 13 kgf. In addition, the curve G is a × point
It was impossible to measure due to abnormal enlargement in the vicinity of (about 0.075 Kgf / cm ² ).

There are two kinds of large and small soft volleyballs currently on the market, and a large ball has a total weight of 210.
g, small size ball is heavy type 180g, lightweight type 150
It is g. However, even for balls with different total weights, the bobbin weight is 1.0g for a 150g ball.
(0.66% of total weight), 1.0g for 180g ball (0.56% of total weight), 1.2g for 210g (0.57% of total weight)
g), and with these values, the growth rate can be suppressed low and the impact force can be mitigated. That is, the yarn weight is 0.
It can be said that 1 g to 5 g is an absolute value that is not directly related to the size (total weight) of the ball. By the way, the total weight of the conventional No. 5 volleyball (with leather panel attached) is 270.
g, yarn weight 18g (ratio to total weight 6.49%), 5
The total weight of the No. soccer ball (with leather panel) is 425.
g, yarn weight is 32 g (ratio of total weight to 7.53%). From this, it can be seen that the soft volleyball according to the present invention has a significantly smaller yarn weight both in absolute value and in ratio to the total weight as compared with the conventional ball.

In the above embodiment, a ball in which nylon monofilament is wound on a tube and a rubber skin layer is formed on the tube has been described, but a leather panel is attached on the wound layer to form a volleyball or soccer ball. It is also possible to form a rubber inner layer on the above or a wound layer, and attach a leather panel on this with rubber glue to make a volleyball or soccer ball. It is also possible to use polyester monofilament instead of nylon monofilament, and use these processed yarns, for example, twisted, heat-fixed and untwisted monofilament to give twist distortion, and spun yarn of these. You can also do it.

When an elementary school student uses this kind of soft volleyball, the degree of soft feeling can be changed and adjusted depending on the grade difference of 6 years, the difference between men and women, the difference in athletic ability and the like. For example, children in lower grades of elementary school prefer volleyball if it is softer, and it is desirable that the ball does not hurt the body and does not bounce. The thread weight of the ball suitable for this is about 0.1 g to 2 g. In addition, for children in the upper grades of elementary school, a ball that gives a more struck feeling and a bouncing ball is preferred to the above soft volleyball due to improvement in physical strength and athletic ability. This is because the fear of the impact force is faint and the player wants to play closer to an actual volleyball game. Therefore,
In this case, a ball having a yarn weight of 2 to 5 g is desirable.

The inventors of the present invention have found that the soft volleyball having the above structure (total weight: 145 g, yarn weight: 2.73 g, internal pressure: 0.05 Kgf / cm ² ).
50 were distributed to elementary schools (total number of children: about 1,500) in three regions of Hokkaido, Kansai, and Chugoku, and all the students used them in physical education for about half a year for evaluation. As a result, the growth and deformation that would hinder the competition did not occur, and it was confirmed that the durability was improved. Regarding the feel, a soft feel was obtained that was almost indistinguishable from the conventional soft volleyball of the rubber layer alone. From the lower grades to the upper grades, it was used evenly by grade.
At the time of providing the ball, at the same time, the soft volleyball of the conventional structure was also provided, but in the end, the conventional soft volleyball was hardly used. This is because the conventional ball grows and deforms in a short time, which hinders the game.

[0019]

EFFECT OF THE INVENTION The present invention is a basic element as a ball for ball games since nylon or polyester fiber is wound around a tube within a yarn weight range of 0.1 g to 5 g as a thread winding reinforcing layer. It is possible to remarkably improve the certain spherical shape maintaining property, and to mitigate the impact when hitting a hand, a leg or the like, and to make the feel soft. That is, it is possible to realize a ball for a ball game that simultaneously satisfies the durability and the soft feel, which are generally considered to be in conflict with each other.

[Brief description of drawings]

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

FIG. 2 is a curve diagram showing yarn weight-growth rate characteristics.

FIG. 3 is a curve diagram showing yarn weight-impact force characteristics.

FIG. 4 is a curve diagram showing internal pressure-growth rate characteristics.

FIG. 5 is a curve diagram showing internal pressure-impact force characteristics.

[Explanation of symbols]

 1 tube 2 hand-wound reinforcing layer 3 rubber skin layer

Claims (1)

[Claims] 1. A rubber tube having a spherical hollow body in which compressed air is enclosed, a thread winding reinforcing layer formed by winding nylon or polyester fiber on the surface of the tube, and a rubber layer directly or on the thread winding reinforcing layer. In a ball game ball comprising a leather panel or a rubber skin adhered together, the bobbin reinforcing layer has a weight set within a range of 0.1 g to 5 g.