JP2023542050A - safety golf balls for practice - Google Patents

Abstract

The present invention relates to a safety golf ball for practice, and more particularly, to a safety golf ball for practice that provides substantially the same effects as when practicing with an actual golf ball and can prevent accidents. To this end, the practice safety golf ball is characterized by having a high elastic recovery rate, including a soft outer core in addition to the existing inner core.

Description

The present invention relates to a safe golf ball for practice, and more particularly to a safe golf ball for practice that can provide substantially the same effects as when practicing with an actual golf ball and can prevent accidents.

Golf is a game in which a stationary ball is hit into a hole with a golf club on a playing field with many holes, and the player who takes the least number of strokes to hit the hole wins. It is a competition. Recently, golf has become more and more popular, with many talented Korean professional players appearing and winning championships. For this reason, industries related to golf, such as golf equipment and clothing, are also growing together.

The structure of a golf ball is very important because it affects the flight distance and spin performance of the golf ball. In general, golf balls have different structures depending on their structure: a one-piece golf ball with a single structure, a two-piece golf ball with a two-layer structure consisting of a core and a cover surrounding the core, and a three-layer structure consisting of a double core and a cover. A 3-piece golf ball with a 3-layer structure consisting of a core and a double cover, a 4-piece golf ball with a 3-layer structure consisting of a core and a 3-layer cover, and a 4-piece golf ball with a 3-layer structure consisting of a double core and a double cover. It is classified into a piece golf ball and a four-piece golf ball consisting of a triple core and one cover. Golf balls classified in this way are generally very hard and suitable for outdoor use; however, when used indoors, large noises are generated when the golf ball is struck by a club, and golf balls that are struck by Due to the risk of injury caused by the ball, there is the disadvantage that it has not yet reached the level of revitalization as an indoor sport.

In addition, since there is no suitable golf ball for screen golf using a simulator, simulations must be performed using the actual ball used in the field, and in such cases, it is difficult to As shown in FIG. 1, noise problems occur during hitting, and it is necessary to install a number of shock absorbers in the booth to prevent injuries from being hit by the ball.

On the other hand, although some practice balls have recently been developed, these practice balls are completely different from actual golf balls, so they are not used for normal practice. I couldn't. For this reason, there is currently a desire to develop a safe golf ball for practice that can be used safely indoors while also maximizing the performance of an actual golf ball.

Republic of Korea Registered Utility Model Publication No. 20-0318661

The present invention was devised to solve the above-mentioned inconveniences, and the purpose of the present invention is to obtain substantially the same effect as when practicing with an actual golf ball and to prevent accidents. We provide safe golf balls for practice.

These and other objects and advantages of the present invention will become more apparent from the following description of the preferred embodiments.

The above objects are achieved by a practice safety golf ball having a soft yet fast elastic recovery outer core, with a hardness that gradually decreases towards the outside.

A safety golf ball for practice according to an embodiment of the present invention to solve the above problems includes an inner core, a soft outer core having a lower hardness than the inner core, and a cover located on the outside. However, the hardness of the outer core gradually decreases toward the outside.

In this case, the outer core may be a multi-piece golf ball having three or more layers covering the inner core.

The outer core may also be made from a polyurethane sponge material.

Furthermore, the hardness of the outer core may decrease linearly as it moves outward.

Furthermore, a pattern for recognizing rotation may be formed on the cover of the safety golf ball for practice.

At this time, the rotation recognition pattern is a sign having two or more folded structures, a sign having a combination of two dots and a straight line, a sign having a combination of three or more dots, or a QR code ( (registered trademark) may have a part of the pattern.

According to the present invention, by including a soft outer core in the existing inner core, it is possible to achieve substantially the same effect when practicing a full swing or half swing as when practicing with an actual golf ball.

Moreover, not only can it be used repeatedly while maintaining an appropriate level of elasticity, but it can also prevent accidents and can also be used indoors.

However, the effects of the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a partially cutaway sectional view of a golf ball according to an embodiment of the present invention. FIG. 3 is a diagram showing an example of a rotation recognition pattern formed on a golf ball cover according to an embodiment of the present invention. 2 is a graph showing the average flight distance after hitting an actual golf ball and Examples 1 and 2 using a simulator used in screen golf.

Hereinafter, the present invention will be described in detail based on embodiments of the present invention and drawings. It is common knowledge in the art that these embodiments are merely presented as examples to more specifically explain the present invention, and that the scope of the present invention is not limited in any way by these embodiments. It is self-evident for those who have the following.

In addition, all technical and scientific terms used in this disclosure are defined by those of ordinary skill in the art to which this disclosure pertains, unless specifically pointed out herein or clearly contradicted by context. In the event of conflict, the statements in this disclosure, including definitions, shall prevail.

In order to clearly explain the invention shown in the drawings, explanations of parts unrelated to the description are omitted, and similar parts are given similar drawing symbols throughout the specification. . Also, when a part is said to "comprise" a certain component, unless otherwise specified, this does not exclude other components, and means that it may further include other components. do. Note that the "unit" described in this disclosure refers to one unit or block that performs a specific function.

In each step, the wording of the identification code (such as "first" or "second") is used for ease of explanation, and the identification code does not explain the order of each step. Rather, steps may be performed out of the stated order, unless the context clearly dictates a particular order. That is, each step may be performed in the same order as specified, substantially simultaneously, or in the opposite order.

FIG. 1 is a partially cutaway sectional view of a golf ball 100 according to an embodiment of the present invention.

Referring to FIG. 1, a safety golf ball 100 for practice according to an embodiment of the present invention has an inner core 10 that is the same as existing golf balls, an outer core 20 that is soft and has quick elastic recovery, and is located on the outside. It is composed of a cover 30.

Considering a two-piece golf ball that is frequently used for practice as the basis, the inner core 10 of the existing golf ball may be made of polybutadiene, tungsten, or the like. At this time, the most important variable is hardness; higher hardness may mean something for advanced users, and lower hardness may mean something for beginners.

The principle behind the golf ball moving forward is that the golf ball receives force from the impact of the golf crumb and is sufficiently distorted and then recovers, converting the impact energy into kinetic energy and moving forward. At this time, if the hardness is high, the energy conversion efficiency will decrease and a large amount of impact energy will remain.

Additionally, because the golf ball is forced to rotate in the opposite direction due to the angle of the iron club, after receiving sufficient repulsive force, the impact energy changes into rotational force and repulsive force, causing the ball to fly. At this time, even if the force is the same, only when the rubber elasticity of the golf ball is fired to its maximum while the golf ball is severely distorted will the initial firing speed increase, the rotation will be well applied, and the flight angle will be sufficiently high.

As a result, techniques have been developed to produce golf balls that are soft and safe, yet can fly a long distance.

In the present invention, for this purpose, the outer core 20 is made of a material such as polyurethane sponge, which is soft and has quick elastic recovery.

At this time, the polyurethane sponge is a foam that has an elastic recovery force, that is, the ability to return to its original state when it is pressed and released.The reason why the elastic recovery is possible is that the empty space in the sponge This is because almost everything is connected, and the air that escapes when you press it fills its original place when it returns to its original state. The hardness and elastic recovery speed of the polyurethane sponge can be determined in various ways depending on the foaming ratio, that is, the air content per unit volume.

In addition, in terms of elasticity, since the elasticity of a golf ball is proportional to the flight distance, the flight distance will not decrease when compared to a normal golf ball by using a sponge that recovers quickly.

Furthermore, in terms of hardness, since the hardness of the outer core 20 is lower than that of a normal golf ball, the outer core 20 can be designed to have an n-layer structure in order to compensate for the reduction in flight distance. The foaming ratio of the polyurethane sponge from layer to layer can be varied to provide progressively decreasing hardness as one progresses outward.

The cover 30 is manufactured to have a thickness of 1 mm to 3 mm using a synthetic resin such as urethane or ionomer, and various pigments may be added to give variations to the color of the manufactured golf ball.

Furthermore, the cover 30 of the golf ball has various rotation recognition patterns (patterns, unevenness, structures, etc.) may be formed.

FIG. 2 is a diagram showing an example of a rotation recognition pattern formed on the golf ball cover 30 according to the embodiment of the present invention.

The rotation recognition pattern is used for simulation purposes by an optical recognition device such as a camera to recognize (photograph) and measure the rotation, and an optical recognition device such as a sensor to measure the rotation speed of the golf ball. In order to achieve this, after the golf ball is hit, a sensor photographs the hit golf ball at at least two locations spaced apart by a certain distance in the hitting direction, and measures changes in the position of the pattern for rotation recognition over a short period of time. is necessary.

By such a method, the rotation recognition pattern of the present invention for measuring rotation speed with an optical recognition device is a mark having two or more folded structures, or a mark having a combination of two points and a straight line, Alternatively, it may have a sign that is a combination of three or more dots, or a pattern that is part of a QR code (registered trademark).

Referring to FIG. 2, a number of patterns for rotation recognition are shown, which can be modified in various ways within the scope of the present invention. Note that this is displayed on one side of the cover 30 of the golf ball 100 to easily confirm the traveling direction and rotation direction of the golf ball 100, and is composed of at least one of figures and letters. Ru.

Fig. 2(a) shows a sign with a U-shape having two or more folded structures, and Fig. 2(b) shows a sign with a Z-shape with two or more folded structures. (c) is a label exhibiting a "T" shape with two or more folded structures. In addition, (d) is a sign that is a combination of two points and a straight line, and the two points are located on the same line, and (e) is a QR code (registered trademark). (f) is a sign in which three points are combined, two points of the same size are located on the same line, and the remaining one is located on the same line. The points are of different sizes.

Since such a pattern does not have a symmetrical structure inside the pattern, changes in the position of the pattern are analyzed based on the shape of the pattern that appears in two images taken at at least two locations after the ball is hit. This is because the rotation speed can be easily calculated.

Specifically, a sensor such as a high-speed camera installed at a screened golf course is used to continuously photograph the pattern of a specific structure, and the pattern is recorded along with the direction and speed of the golf ball measured during the hit. By analyzing and calculating the rotational speed of the golf ball using the instantaneous change in position of the ball, the trajectory of the hit golf ball can be calculated.

Normally, when playing a golf game or practicing using screen golf, the speed of the golf ball after hitting is acquired by a speed sensor installed in front of or above the practitioner, and the rotation of the golf ball is measured by the golf ball cover 30. The rotation speed is calculated by taking an image of the pattern formed in the image and measuring the change in the position of the pattern over a specific period of time. Using such velocity vector and rotational speed data, the simulator calculates the flight distance of a golf ball hit and its roll after falling, taking into account the speed and direction of the wind and the conditions of the grass at the point of fall. The distance will be calculated and displayed as an image on the screen.

In order for the safety golf ball 100 for practice of the present invention to be used at such a screen golf course, it is necessary that the trajectory of the ball measured and calculated by measuring equipment after hitting the golf ball be the same as the trajectory after actually hitting the golf ball. It is necessary to calculate almost the same as . For this reason, the golf ball 100 of the present invention must have the characteristic of maintaining a constant ratio to the distance measured by actually hitting it with various irons.

Hereinafter, the structure of the present invention and the effects thereof will be explained in more detail by giving specific examples. However, these Examples are merely provided to explain the present invention in more detail, and the scope of the present invention is not limited by these Examples.

[Example 1]
The diameter of the inner core 10 is 25 mm, the outer core 20 has a layer thickness of 3 mm from the first envelope layer to the fifth envelope layer, and the cover 30 has a thickness of 1 mm. The foaming ratio of the polyurethane sponge, that is, the air content per unit volume, was reduced at a constant rate for each layer to create 6 pieces of practice with hardness of 90, 80, 70, 60, and 50 from the inside. A safety golf ball 100 was prepared, and this was designated as Example 1.

[Example 2]
The diameter of the inner core 10 is 25 mm, the outer core 20 has a layer thickness of 3 mm from the first envelope layer to the fifth envelope layer, and the cover 30 has a thickness of 1 mm. The foaming ratio of the polyurethane sponge, that is, the air content per unit volume, was reduced at a non-constant ratio for each layer, and the hardness was 90, 75, 60, 55, and 50 in order from the inside. A safety golf ball 100 was prepared for use as Example 2.

[Experiment example]
After hitting No. 7, No. 8, and No. 9 irons 10 times at the same swing speed (100 MPH) using a golf swing machine (RoboGolfPro: registered trademark) and a flight distance measurement system for screen golf courses, The average flight distance was simulated. The results of each experiment are shown in Table 1 and FIG. 3 below.

As is clear from Table 1 and FIG. 3 above, an average flight distance of about 80 to 90% was obtained when compared to the average flight distance when hitting an actual golf ball. However, in the case of Example 2, the deviation of the measured values themselves was too large, and the reliability of the results was also low. In addition, it was found that Example 1 was also the most excellent in terms of recovery speed.

Referring to FIG. 3, in the case of Example 1, the flight distance appears linearly depending on the type of iron, whereas in the case of Example 2, the flight distance is affected by the type of iron and measurement deviation. You can see how it appears nonlinearly.

When playing screen golf using the safety golf ball 100 for practice of the present invention, there is a specific flight distance calculated from the speed and rotation measured after hitting with the golf ball 100 of the present invention. By calculating the distance by multiplying the ratio, the flight distance can be displayed on the screen almost the same as when hitting an actual golf ball, and when practicing with an actual golf ball. Almost the same effect can be obtained.

In addition, the hardness gradually decreases toward the outside, making the ball soft and safe, reducing the degree of damage caused by hitting the ball, and making it safe for children to use.

In this disclosure, only some examples of various embodiments made by the present inventor are cited and explained, but the technical idea of the present invention is not limited or limited thereto. It goes without saying that it can be modified and implemented in various ways by those skilled in the art.

100 Safety golf ball for practice 10 Inner core 20 Outer core 30 Cover

Claims (6)

inner core and
a soft outer core having a lower hardness than the inner core;
a cover located on the outside;
A safety golf ball for practice, comprising:
A safety golf ball for practice, wherein the hardness of the outer core gradually decreases toward the outside. The outer core is
The safety golf ball for practice according to claim 1, characterized in that it is composed of three or more layers. The outer core is
A practice safety golf ball according to claim 2, characterized in that it is made from a polyurethane sponge material. 4. The practice safety golf ball of claim 2 or claim 3, wherein the hardness of the outer core decreases linearly as it moves outward. The safety golf ball for practice according to claim 1, wherein the cover is formed with a pattern for recognizing rotation. The pattern for rotation recognition is a sign with two or more folded structures, a sign with a combination of two points and a straight line, a sign with a combination of three or more points, or a QR code (registered trademark). The safety golf ball for practice according to claim 5, characterized in that it has a pattern of a portion of.

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