KR20230002002U - Safety Sponge Golf Ball for Practice - Google Patents

Abstract

The present invention relates to a safety sponge golf ball, and more specifically, to a safety sponge golf ball that can achieve similar effects to practicing with an actual golf ball and prevent safety accidents. To this end, the safety sponge golf ball is characterized by a fast elastic recovery speed by including a soft outer core in addition to the existing inner core.

Description

Safety Sponge Golf Ball for Practice}

The present invention relates to a safety sponge golf ball, and more specifically, to a safety sponge golf ball that can achieve similar effects to practicing with an actual golf ball and prevent safety accidents.

Golf is a game in which players hit a stationary ball with a golf club into a hole in a stadium with multiple holes, and the person who takes the fewest strokes to get into the hole wins. Recently, golf has become increasingly popular, with many talented Korean professional players emerging and winning championships. Accordingly, industries related to golf, golf equipment, and clothing are also growing.

The structure of a golf ball is very important because it affects the distance and spin performance of the golf ball. Generally, depending on the structure, golf balls are divided into one-piece golf balls with a single structure, two-piece golf balls with a two-layer structure consisting of a core and a cover surrounding the core, and three-piece golf balls with 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 core and a 3-layer cover, a 4-piece golf ball with a double core and a double cover, and a triple core and It is classified as a 4-piece golf ball with one cover. Golf balls classified in this way are generally very hard and are suitable for use outdoors, but when used indoors, a loud noise is generated when the golf ball is struck by the club, and there is a risk of injury from the struck golf ball, which causes indoor use. There is a problem with it not being active as a sport.

In addition, since there are no suitable balls for the golf balls used in screen golf using simulators, there is no choice but to simulate them using actual balls used in the field. In this case, as mentioned earlier, noise problems occur when hitting, and To prevent injuries caused by hit balls, it is necessary to install many shock absorbers in the booth.

Meanwhile, some practice balls have been developed recently, but these practice balls are so different from actual golf balls that proper practice cannot be performed. Accordingly, there is a need for the development of a safety sponge golf ball that can be used safely indoors and can mimic the performance of an actual golf ball as much as possible.

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

The present invention is intended to solve the above problems, and the purpose of the present invention is to provide a safety sponge golf ball that can achieve similar effects to practicing with an actual golf ball and prevent safety accidents.

The above and other objects and advantages of the present invention will become clear from the following description of preferred embodiments.

The above objective can be achieved by a safety sponge golf ball that has an outer core that is soft and has quick elastic recovery, and whose hardness decreases toward the outside.

A safety sponge golf ball according to an embodiment of the present invention to solve the above problem has an inner core, an outer core composed of a soft polyurethane sponge with a lower hardness than the inner core, and a cover located on the outside, and the outer core. The core is composed of multi-layered surrounding layers, and each layer is characterized in that the foaming rate of the polyurethane sponge, that is, the air content per unit volume, is lowered by reducing the foaming rate of the polyurethane sponge at a constant rate for each layer.

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

Additionally, the outer core may be made of a material such as polyurethane sponge.

Additionally, the hardness of each surrounding layer of the outer core may decrease linearly toward the outside.

Additionally, a rotation recognition pattern may be formed on the cover of the safety sponge golf ball.

At this time, the pattern for rotation recognition may include a mark including two or more bent structures, a mark combining two dots and a straight line, a mark combining three dots, or a partial shape of a QR code.

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

In addition, not only can it be used repeatedly by maintaining an appropriate level of elasticity, but it can also be used indoors as it can prevent safety accidents.

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

1 is a partially cut cross-sectional view of a safety sponge golf ball according to an embodiment of the present invention.
Figure 2 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.
Figure 3 is a graph showing the average 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 with reference to embodiments of the present invention and drawings. These examples are only presented as examples to explain the present invention in more detail, and it will be obvious to those skilled in the art that the scope of the present invention is not limited by these examples. .

Additionally, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains, and in case of conflict, this specification including definitions The description will take precedence.

In order to clearly explain the proposed design in the drawings, parts that are not relevant to the description are omitted, and similar parts are given similar reference numerals throughout the specification. And, when it is said that a part "includes" a certain component, this means that it does not exclude other components, but may further include other components, unless specifically stated to the contrary. Additionally, “unit” as used in the specification refers to a unit or block that performs a specific function.

Identification codes (first, second, etc.) for each step are used for convenience of explanation. The identification codes do not describe the order of each step, and each step does not clearly state a specific order in context. It may be carried out differently from the order specified above. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

Figure 1 is a partially cut cross-sectional view of the safety sponge golf ball 100 according to an embodiment of the present invention.

Referring to FIG. 1, the safety sponge golf ball 100 according to an embodiment of the present invention includes an inner core 10 identical to a conventional golf ball, an outer core 20 that is soft and has quick elastic recovery, and a cover located on the outside. It consists of (30).

Considering the two-piece design commonly used for practice, the inner core 10 of an existing golf ball can be constructed using polybutadiene or tungsten. At this time, the most important variable is hardness. Higher hardness means it is for advanced users, and lower hardness means it is for beginners.

The principle by which a golf ball moves forward is that the golf ball, which has received force from the strike of the golf club, is sufficiently deformed and recovered, converting the impact energy into kinetic energy and moving forward. At this time, if the hardness is high, the energy conversion efficiency decreases and a lot of impact energy remains.

Additionally, since the golf ball is inevitably subject to reverse rotation due to the angle of the iron club, after receiving sufficient repulsion force, the impact energy is converted into rotation and repulsion force and the ball flies. At this time, even with the same force, the golf ball is deformed a lot and the rubber elasticity of the golf ball must be maximized to increase the initial launch speed, rotate well, and sufficiently increase the flight angle.

Accordingly, technologies are being developed to create soft, safe golf balls that can produce distance.

For this purpose, the present invention implements the outer core 20, which is soft and has fast elastic recovery, using a material such as polyurethane sponge.

At this time, the polyurethane sponge is a foam that has elastic recovery, that is, the power to return to its original state when pressed and released. The reason why elastic recovery is possible is because almost all of the empty spaces in the sponge are connected, so the air that escapes when pressed is restored to its original state. This is because it fills the space when needed. The polyurethane sponge can have various hardness and elasticity recovery rates depending on the foaming ratio, that is, the air content per unit volume.

Additionally, in the elastic part, since the elasticity and distance of a golf ball are proportional, the distance may not decrease when compared to a typical golf ball by using a sponge with fast elastic recovery.

In addition, in terms of hardness, in order to compensate for the decrease in distance due to the hardness of the outer core 20 being lower than that of a typical golf ball, the outer core 20 can be designed as an n-layer surrounded layer structure, By varying the foaming ratio of the star polyurethane sponge, hardness can be reduced toward the outside.

In addition, it is preferable that the hardness within each surrounding layer of the outer core decreases linearly toward the outside.

The cover 30 is manufactured as thin as 1 mm to 3 mm using a synthetic resin called urethane or ionomer, and various pigments may be added to vary the color of the golf ball being manufactured.

In addition, the cover 30 of the golf ball can be formed with various rotation recognition patterns (patterns, uneven structures, etc.) so that it can be used in a screen golf simulation device that calculates the trajectory of the golf ball by measuring the rotation speed after hitting. there is.

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

The pattern for rotation recognition is to measure rotation by recognition (filming) by an optical recognition device such as a camera for simulation. In order to measure the rotation speed of a golf ball by an optical recognition device such as a sensor, the rotation speed is measured in the hitting direction after hitting. It is necessary to measure the positional change of the rotation recognition pattern over a short period of time by photographing a golf ball that has been hit by a sensor at at least two spaced apart locations.

The rotation recognition pattern of the present invention for measuring rotation speed by an optical recognition device in this way is a mark containing two or more bent structures, a mark combining two dots and a straight line, a mark combining three dots, or a QR code. It may have some shape (QR code).

Referring to Figure 2, several rotation recognition patterns are shown, which can be modified in various ways within the scope of the present invention. In addition, it is displayed on one side of the cover 30 of the golf ball 100 to easily check the traveling direction and rotation direction of the golf ball 100, and is composed of at least one of a figure or a letter.

In Figure 2, (a) is a mark that is a left-right inversion of the digt 'ㄷ' shape containing two or more bent structures, (b) is a mark that has a jet 'Z' shape containing two or more bent structures, (c) is a mark in the shape of a 'T' containing two or more bending structures. In addition, (d) is a mark that is a combination of two dots and a straight line, with the two dots located on the same line, (e) is a mark that shows a partial shape of the QR code, and (f) is a mark that is a combination of three dots. Two dots of the same size are located on the same line, and the remaining dots are of different sizes.

This is because this pattern does not have a symmetrical structure inside the pattern, so the rotational speed of the ball can be easily calculated by analyzing the change in position of the pattern based on the shape of the pattern shown in two images taken at least in two places after hitting.

Specifically, a pattern of a specific structure is continuously photographed using a sensor such as a high-speed camera installed on a screen golf course, and the rotational speed of the golf ball is measured through the instantaneous position change of the pattern as well as the direction and speed of the golf ball measured at the time of hitting. By analyzing and calculating, 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 or on the top of the practitioner, and the rotation of the golf ball is measured through the pattern formed on the golf ball cover 30. The rotation speed is calculated by measuring the change in the position of the pattern over a specific period of time. Using these speed vectors and rotational speed data, the simulator calculates the flight distance of the hit golf ball and the rolling distance after falling, taking into account the wind speed and direction and the grass conditions at the landing point, and displays it as an image on the screen. .

In order for the safety sponge golf ball 100 of the present invention to be used on such a screen golf course, it is necessary that the trajectory of the golf ball measured and calculated by a measuring device after hitting is calculated to be similar to the trajectory after hitting an actual golf ball. For this purpose, the golf ball 100 of the present invention is required to maintain a constant ratio with the distance measured by hitting it with various irons and hitting it with an actual golf ball.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through specific examples. However, this embodiment is intended to explain the present invention in more detail, and the scope of the present invention is not limited to these embodiments.

[Example 1]

The diameter of the inner core 10 was 25 mm, the outer core 20 was manufactured with a thickness of each layer from the first to the fifth enclosure layer of 3 mm, and the cover 30 was manufactured with a thickness of 1 mm. In (20), the foaming ratio of the polyurethane sponge, that is, the air content per unit volume, is reduced at a constant rate for each layer, and the hardness is 90, 80, 70, 60, and 50 from the inside. A 6-piece safety sponge golf ball (100) is made. It was configured, and this was referred to as Example 1.

[Example 2]

The diameter of the inner core 10 was 25 mm, the outer core 20 was manufactured with a thickness of each layer from the first to the fifth enclosure layer of 3 mm, and the cover 30 was manufactured with a thickness of 1 mm. (20), the foaming ratio of the polyurethane sponge, that is, the air content per unit volume, is reduced at an irregular rate for each layer, and the hardness is 90, 75, 60, 55, and 50 from the inside. A 6-piece safety sponge golf ball (100 ) was constructed, and this was referred to as Example 2.

[Experiment example]

Using a golf swing machine (RoboGolfPro) and a distance measurement system for screen golf courses, the average distance was simulated after hitting the 7th, 8th, and 9th irons 10 times with the same force (swing speed 100 MPH). The results of each experiment are shown in Table 1 and Figure 3 below.

[Table 1]

As can be seen from Table 1 and Figure 3, an average distance of about 80 to 90% was obtained compared to the average distance when hitting an actual golf ball. However, in Example 2, the deviation of the measurement values themselves was so large that the reliability of the results was also low. In addition, it was found that Example 1 was the best in terms of recovery speed.

Referring to Figure 3, in Example 1, the distance appears linear depending on the type of iron, whereas in Example 2, the distance appears non-linearly depending on the type of iron and measurement deviation. there is.

When playing screen golf using the safety sponge golf ball 100 of the present invention, the distance calculated by the speed and rotation measured after hitting using the golf ball 100 of the present invention is multiplied by a specific ratio. By calculating the distance, a distance that is almost similar to hitting with an actual golf ball can be displayed on the screen, resulting in a very similar effect to practicing with an actual golf ball.

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

In this specification, only a few examples of various embodiments performed by the present inventor are described, but the technical idea of the present invention is not limited or restricted thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

100: Safety sponge golf ball
10: Inner core
20: external core
30: cover

Claims (6)

inner core; and
an outer core composed of a soft polyurethane sponge with lower hardness than the inner core; and
A safety sponge golf ball having a cover located on the outside,
The outer core is composed of a multi-layered enclosing layer, wherein each layer reduces the foaming rate of the polyurethane sponge, that is, the air content per unit volume, at a constant rate for each layer, so that the hardness decreases toward the outside. cheek. According to paragraph 1,
The outer core is,
Safety sponge golf ball, characterized in that it consists of three or more enclosing layers According to clause 2,
The outer core is,
A safety sponge golf ball, characterized by using a polyurethane sponge material. According to paragraph 2 or 3,
A safety sponge golf ball, characterized in that the hardness of each surrounding layer of the outer core decreases linearly as it goes outward. According to paragraph 1,
A safety sponge golf ball, characterized in that a pattern for rotation recognition is formed on the cover. According to clause 5,
The pattern for rotation recognition includes a mark containing two or more bending structures, a mark combining two dots and a straight line, a mark combining three dots, or a partial shape of a QR code, safety. Sponge golf ball.