KR101309993B1 - Golf ball - Google Patents

Abstract

PURPOSE: A golf ball with dimples is provided to increase a flight distance by increasing the area of the dimples and to improve directivity and consistency. CONSTITUTION: A golf ball with dimples comprises four spherical triangle regions and three spherical rectangular regions. The four spherical triangle regions and three spherical rectangular regions are divided by a horizontal division line (21) for dividing the surface of a golf ball up and down and three incline division lines (22, 24) which crosses the horizontal division line with an interval. The triangle regions and the rectangular regions are symmetrically formed on an upper sphere and a lower sphere, respectively. Circular dimple groups are aggregately arranged on the triangle regions and the rectangular regions. The dimple groups have different diameters. The dimple groups are symmetrically formed on the border of the triangle regions and the rectangular regions.

Description

Golf ball {GOLF BALL}

The present invention relates to golf balls, and more particularly to the arrangement of dimples on the golf ball surface.

Golf balls have recently added a crosslinking agent to synthetic rubber in earlier models of golf history, made from natural materials such as wood balls, feather balls or gutta-percha balls. The appearance of 1PC golf balls produced by the appearance of the performance has improved dramatically. Later, DuPont, USA, developed ionomer resins incorporating metal ions into copolymers of ethylene and acrylic acid, and used them to cover golf balls. The ball also appeared.

On the other hand, after the early golf ball was found to have a smooth surface but a dimple on the surface, an unexpected flying distance was realized, with the above-mentioned efforts to improve the performance of the golf ball material, The dimple design has been renewed to improve the golf ball performance.

Measures of golf ball performance related to these dimples include straightness, consistency, and flying distance. Various attempts have been made to improve the performance of golf balls by improving the size, depth, shape, and division of the golf ball surface. ought.

As an example of the prior art for dimple design, US Pat. No. 4,560,168 discloses dividing a sphere into 20 spherical triangles and 12 spherical pentagons. However, in the U.S. Patent 4,560,168, since the dimples do not span the dividing line consisting of six members, the area ratio occupied by the dimples to the concrete surface area decreases, thus causing the lack of lift during flight and the drag force increases, thereby reducing the flying distance. have.

Attempts to increase the dimple area ratio in such spherical spheres have been disclosed in Korean Patent No. 113232. The patent improves the dimple area ratio by drawing dimples on five dividing lines except the equator (molding joint line) among the six members.However, the equator portion of the sphere has a straight line to improve the dimple area ratio. There are limitations, and the five dividing lines of the curved waveform and the straight equator line are not isotropic, so there is a problem in the straightness of the golf ball.

As another conventional example, Korean Patent No. 116773 discloses a sphere consisting of 6-8 polyhedrons, and among the division lines consisting of four members, three dimples except for the equator are designed to have dimples spanning them. This straight line also limits the dimple area ratio and also has problems with straightness and consistency.

On the other hand, the consistency of the putting distance is also important in terms of the performance of the golf ball, there is a demand for improved performance.

An object of the present invention is to increase the dimple area ratio to bring the maximum distance, improve the isotropy in the arrangement and structure of the partition and dimple on the surface of the sphere to improve the straightness and consistency during the flight process or putting golf ball To provide.

The present invention basically ensures symmetry in the divided partitions with respect to the golf ball surface for dimple placement, in addition to ensuring the symmetry and compactness in relation to the dimple arrangement at each divided partition area and its boundary, and at the same time By maximizing the area ratio of, it is intended to improve the distance, straightness and consistency of the golf ball described above.

In accordance with the above-described problems, the present invention, the surface of the golf ball, the horizontal partition line that divides the golf ball up and down; Three inclined partition lines having a plane angle of 60 degrees with the horizontal partition line and intersecting the horizontal partition line at equal intervals along the horizontal partition line, wherein four globular triangular regions and three globular rectangular regions are the upper and lower hemisphere surfaces of the golf ball. It is symmetrically formed in each, and each of the spherical triangular region and the spherical quadrangular region and the circular dimple groups are arranged in close proximity to each other to provide a golf ball.

The dimple groups may have different diameter sizes, in which case the dimple groups of different diameter sizes are preferably formed symmetrically in the boundaries and inside the spherical triangle and the spherical rectangle.

Further, the spherical triangular regions may be arranged in dimple groups of the same diameter size, in which case the spherical triangular regions are preferably arranged in dimple groups having the largest diameter size.

In addition, the spherical rectangular region may be arranged in a group of dimples having different diameters, and in this case, the spherical rectangular region may be smaller in diameter from the boundary to the center of the dimple.

The dimple groups having different diameter sizes may include: a first dimple group disposed within the spherical triangle region and being densely arranged on the sides of the spherical triangle at the same time; A second dimple group disposed at a boundary between the spherical triangular regions in contact with the spherical triangular regions and at the same time arranged in a dense manner with the first dimple group and occupying a part of the spherical triangular regions; And a third dimple group disposed densely with the first dimple group and the second dimple group at a vertex boundary of the spherical rectangle and occupying a portion of the spherical triangular region.

In this case, the waveform line formed by the first dimple group, the second dimple group, and the third dimple group exhibits a periodic waveform oscillating in the vertical direction about the boundary line between the spherical triangular area and the spherical rectangular area. It is done. It is preferable that the amplitude of the said waveform line is more than 0 and 2 mm or less.

The golf ball may be manufactured by using a vertical mold having a gate formed at a portion where the waveform line and the boundary line cross each other.

On the other hand, the dimple groups of different diameters are arranged within the spherical rectangular region and are dense with the second dimple group at the same time with each other, and are sequentially arranged from the boundary of the second dimple group. ; And different diameter sizes arranged in the direction of the center of the region at the vertices of the spherical rectangular region, each dimple disposed so as to occupy the maximum surface of the golf ball not occupied by the second to fourth dimple groups. It may further include a fifth dimple group having a.

In this case, it is preferable that the diameters of the first to fifth dimple groups be sequentially reduced in diameter.

In addition, the area ratio occupied by the dimple group is 84% or more with respect to the golf ball surface, and the diameter of the dimple group is preferably 2 mm to 6 mm.

According to the golf ball according to the present invention, in both the divided region and the boundary region, the dimple area ratio can be increased to bring the maximum flying distance, and the isotropy is improved in the arrangement and structure of the partition and the dimple on the surface of the sphere, during the flight process or putting. This can lead to improved straightness and consistency.

1 is a perspective view of a golf ball showing a state in which the surface is partitioned for dimple placement according to the present invention.
Figure 2 is a plan view of a golf ball showing a state where the surface is partitioned for dimple placement according to the present invention.
Figure 3 is another plan view of a golf ball showing a state in which the surface is partitioned for dimple placement according to the present invention.
4 is a plan view of a golf ball showing a dimple arrangement according to the present invention.
5 is a layout of dimples at the boundary of the golf ball section according to the present invention.
FIG. 6 is an explanatory diagram for calculating the dimple area ratio according to the dimple arrangement of FIG. 4. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or equivalent reference numerals are given the same or similar reference numerals, and throughout the specification, when a part includes a certain component, it is excluded that other components are excluded unless specifically stated otherwise. It also means that it may include other components.

First, the division method for the golf ball surface for dimple arrangement will be described. 1 is a perspective view of a golf ball 10 showing a state in which a surface is partitioned for dimple placement in accordance with the present invention, and FIGS. 2 and 3 show respective golf in a state in which a surface is partitioned for a dimple arrangement in accordance with the present invention. Ball 10 top view.

Referring to FIG. 1, the surface of the golf ball 10 is divided and partitioned by four circular partition line groups 20 (21; 22, 23, 24) whose center is the same as the center of the golf ball. Specifically, the circular partition line group 20 includes three horizontal partition lines 21 for partitioning the golf ball 10 up and down, and three inclinations intersecting each other at the same plane angle θ as the horizontal partition line 21. It consists of partition lines 22, 23, 24. In this case, the plane angle θ is preferably 60 degrees so that the partition area of the golf ball can have symmetry in all directions.

Each inclined partition line 22, 23, 24 forms two intersections with the horizontal partition line 21, and a total of six intersections 22a, 22b; 23a, 23b; 24a, 24b along the circumference of the horizontal partition line 21. ) Is formed. In this case, the spacing angle ω between the intersection points 22a, 22b; 23a, 23b; 24a, 24b is preferably 60 degrees so that symmetry with respect to the division area of the golf ball can be ensured.

FIG. 2 is a plan view showing a state in which the circular partition line groups 20 (21, 22, 23, 24) intersect the surface of the golf ball 10 at the same plane angle θ and at a separation angle ω. As shown, a total of four globular triangles 12a, 12b, 12c, 12d and three globular squares 14a, 14b, 14c are symmetric, including centered with respect to the hemisphere surface of golf ball 10. Is formed. 3 is another plan view in the state where the surface of the golf ball 10 is partitioned, and unlike FIG. 2, it is shown so that a spherical rectangle is located in the center.

Accordingly, if it is based on the entire surface of the golf ball 10, a total of eight spherical triangles and six spherical rectangles are symmetrical in all directions and divide and partition the surface of the golf ball 10, thereby allowing golf for dimple placement. Symmetry can be ensured in the splitting section with respect to the ball surface.

It should be noted that the horizontal partition line 21 and the inclined partition lines 22, 23, and 24 described above are arbitrarily distinguished for convenience of description, as can be seen from the symmetrical partitioning section for the golf ball surface. ), When properly rotated, each inclined partition line or horizontal partition line can be placed in a horizontal partition line or another inclined partition line position, thus having a geometrically substantially equivalent meaning in partitioning the golf ball surface.

One of the features of the present invention is to symmetrically divide and partition the golf ball 10 surface as described above in order to improve the distance, straightness and consistency of the golf ball 10 and to define a circular shape at each partition area and its boundary. The dimple group is arranged in a compact manner.

The group of circular dimples may be dimples of the same or different diameter sizes selected from the range 2-6 mm, in standardized standard diameter sizes such as 42.9 mm golf balls. If the dimple diameter is less than 2mm, the lift effect can be significantly reduced during flight, and if the dimple diameter is larger than 6mm, it is not preferable because it can inhibit the straightness and consistency when the speed of the golf ball is dropped during flight or putting.

On the other hand, if seen only in terms of density and symmetry in the arrangement of circular dimples, it may be sufficient to make each dimple diameter of the circular dimple group equal. In this case, the dimples are arranged densely, meaning that any one dimple is fixed by immobilization by being locked by adjacent adjacent dimples. However, when the circular dimple group consists of dimples of the same diameter, the dimple area ratio may be reduced at the entire golf ball 10 surface or at least at the boundary of the divided region.

Thus, as one of the other features of the present invention, it is preferable to configure the diameter of the dimple differently according to the position where the dimple is arranged in consideration of the area ratio together with the density and symmetry in the dimple arrangement.

Hereinafter, with reference to FIG. 4, the preferred embodiment of the dimple arrangement of the different diameter size which can ensure maximum density, symmetry, and area ratio in dimple arrangement | positioning as mentioned above is demonstrated.

In the embodiment of Fig. 4, basically, one of the divided regions is arranged in a dimple of the same diameter size (step 1), and then the boundaries of the other regions and inter-regions are sequentially arranged in different diameter sizes (step 2). An example of the dimple arrangement | positioning which can ensure maximum density, symmetry, and area ratio in dimple arrangement | positioning is shown. However, the diameter size of the plurality of dimple groups different from each other in the embodiment may be appropriately selected within the allowable dimple diameter, for example, 2-6 mm diameter size range, for the diameter size of each dimple group disclosed by way of example Specific numerical values are not to be understood as being limited to the problem of the present invention.

First, in relation to the first step, in the dimple arrangement in the divided region, the dense arrangement of the dimple arrangement is arranged even if a dimple group having the same diameter size is arranged in at least the spherical triangles 12a, 12b, 12c, and 12d. , Ensuring symmetry and area ratio is not impeded. On the other hand, in the case of arranging the insides of the spherical rectangular regions 14a, 14b, and 14c into dimple groups of the same diameter size, the dimple area ratio can be reduced due to the geometry of the spherical squares, which is not preferable.

In this case, arranging the spherical triangles 12a, 12b, 12c, and 12d into the first dimple group DG1 having the largest diameter size ensures the maximum dimple area ratio for the entire golf ball 10 and the golf. It is advantageous in terms of ease of placement of dimple groups of different diameter sizes relative to the remaining area of the ball 10 surface. That is, after arranging the first dimple group DG1 having the largest diameter size, the diameter smaller than the first dimple group DG1 in other remaining divided regions, that is, spherical rectangular regions 14a, 14b and 14c and the boundary region It is preferable to perform the dimple arrangement according to the following two steps of sequentially placing dimple groups of size.

Conversely, if the largest group of dimples with the largest allowable dimple diameter, e.g., the largest group of dimples of size 2-6 mm diameter described above, is first placed in the spherical rectangles 14a, 14b, 14c, the golf ball 10 surface The dimple area ratio at the whole or at least a part of the remaining area of the region is reduced, and as a result, it is difficult to design the arrangement of the dimples necessary to secure the desired maximum density, symmetry and area ratio.

Next, the arrangement of the dimples in the spherical rectangular regions 14a, 14b and 14c and the boundary region according to the second step is such that the diameter of the dimples becomes smaller in the center direction from the boundary of the spherical rectangular regions 14a, 14b and 14c. It is preferred to be configured. This is to secure the dimple area ratio in the boundary region with the spherical triangular regions 12a, 12b, 12c, and 12d on which the first dimple group DG1 having the largest diameter size is disposed, and then the remaining spherical rectangular regions 14a and 14b. , 14c) in order to secure the dimple area ratio in sequence, thereby ensuring the maximum dimple area ratio for the entire golf ball 10 surface. In addition, this criterion for dimple arrangement in the spherical rectangular regions 14a, 14b and 14c and the boundary region is also advantageous for ensuring symmetry of the dimple arrangement.

According to the preferred embodiment of FIG. 4, the dimple groups arranged according to the second step may be divided into second to fifth dimple groups DG2, DG3, DG4 and DG5 according to the arrangement position and shape. It is advantageous to configure the diameter of the second to fifth dimple groups so that the diameters of the second to fifth dimple groups are sequentially reduced according to the arrangement order in terms of securing the maximum dimple area ratio and symmetry and easy dimple arrangement design.

First, a second dimple group DG2 having a size of 4.826 mm smaller than the diameter of the first dimple group DG1 is disposed at the boundary between the spherical triangular region and the spherical rectangular regions 14a, 14b, and 14c. At the same time, the second dimple group DG2 is arranged to be dense with the first dimple group DG1 and occupy a portion of the spherical triangular region.

Next, a third dimple group DG3 having a size of 4.572 mm smaller than the diameter of the second dimple group DG1 is disposed at a vertex boundary of the spherical rectangle. The third dimple group DG3 is densely arranged with the first dimple group DG1 and the second dimple group DG2, and occupies a portion of the spherical triangular region.

Another feature of the present invention is that the dimple arrangement at all boundaries of the symmetrically partitioned region has symmetry or isotropy and at the same time ensures the maximum dimple area ratio, thereby improving the golf distance, straightness and consistency. Can be.

Referring to FIG. 5, the first dimple group DG1, the third dimple group DG3, and the second dimple group DG2 along the top and bottom of the equator line 25 forming a boundary between the spherical triangular region and the spherical rectangular region. ) And the dimple permutation set (DGS) consisting of the third dimple group (DG3) are arranged in a compact manner. The dimple waveform line 30 formed by the dimple permutation set DGS exhibits a periodic waveform oscillating in the vertical direction between the upper limit line 31 and the lower limit line 32 around the equator line 25. The interval l between the upper limit 31 and the lower limit 32 is preferably limited to 2 mm or less in order to facilitate the processing involved in removing burrs after molding and to have a uniform processing quality.

One thing to note here is that the equator line 25 may be either the horizontal division line 21 or the inclined division line 22, 23, 24. In general, golf balls are molded using upper and lower molds, and the upper and lower molds are manufactured so that the dimple corrugation lines 30 become the boundary surfaces of the upper and lower molds, and the dimple corrugation lines 30 are equator lines so as to easily remove burrs after molding. By molding with the gate 25a intersecting with (25) as a gate, the dimple arrangement shown in Fig. 5 is possible at the boundary of all the divided regions of the golf ball surface including the red line 25. That is, the dimple arrangement is isotropic at all boundary regions of the golf ball 10 surface.

Further, most of each dimple area belonging to the second dimple group DG2 and the third dimple group DG3 occupy spherical rectangular areas 14a, 14b, and 14c, but a part of the first dimple group DG1 is It is arranged in the form of intrusion into the spherical triangular regions 12a, 12b, 12c, 12d arranged. That is, the first dimple group DG1, the second dimple group DG2, and the third dimple group DG3 are the spherical triangular regions 12a, 12b, 12c, and 12d and the spherical rectangular regions 14a, 14b, and 14c. The maximum dimple area ratio is secured at the boundary by being arranged as close to each other as possible in the boundary area between the two ends.

In the case of a conventional golf ball molded by using the upper and lower molds, since a dimple is not disposed at the equator line forming at least the boundary of the upper and lower molds, there is a flying distance loss due to the decrease in the dimple area ratio. The arrangement is different from the arrangement of dimples at the boundaries of other divided regions, and there are flight deviations depending on the hitting position on the golf ball, for example, hitting the pole and hitting the equator, so that straightness and consistency are also a problem. On the other hand, as in the present invention, the golf ball having the dimple arrangement of FIG. 5 at the boundary of the divided region, by ensuring the maximum dimple area ratio and symmetry to isotropy at the boundary of all divided regions, including the equator line 25, Improvements in distance, straightness and consistency can be expected for golf balls.

Referring back to FIG. 4, a fourth dimple group DG4 having a size of 4.445 mm smaller than the diameter of the third dimple group is provided inside the rectangular rectangular regions 14a, 14b, and 14c. At the same time, the fourth dimple group DG4 is arranged to be dense with the second dimple group DG2, and are sequentially disposed from the boundary of the second dimple group DG2. Subsequently, at the vertices of the spherical rectangular regions 14a, 14b and 14c, golf is arranged in the direction of the center of the region, wherein each dimple is not occupied by the second to fourth dimple groups DG2, DG3 and DG4. A fifth group of dimples DG5 having different diameter sizes are provided which are arranged to occupy the maximum surface of the ball. In an embodiment, the fifth dimple group DG5 having different diameter sizes is illustrated by three dimple groups DG5a, DG5b, and DG5c having sizes of 4.064 mm, 2.921 mm, and 2.159 mm.

Examples of the arrangement of the fourth dimple group DG4 and the fifth dimple group DG5 include the inside of the spherical triangular regions 12a, 12b, 12c, and 12d, which are one of the divided regions, and the spherical rectangular region 14a, It can be understood as an example of dimples arranged in the boundary area with 14b and 14c, and then dimples are arranged inside the remaining spherical rectangular areas 14a, 14b and 14c so as to secure the maximum area ratio.

6 is an explanatory diagram for calculating a dimple area ratio according to the dimple arrangement of FIG. 4. Referring to FIG. 6, the virtual golf ball area S occupied by one dimple may be calculated by Equation 1 below.

의 범위는 0부터

,

의 범위는 0부터

이다. In this case, D represents the diameter of the golf ball, R represents the diameter of the dimple,

Ranges from 0 to

,

Ranges from 0 to

to be.

The dimple area ratio can be calculated by dividing the sum of the area of the virtual golf ball located on each dimple area calculated by Equation (1) by the total area of the golf ball. The diameter D of the golf ball is 42.9 mm, which is a standard specification, and the diameter R of the dimple group is the size disclosed in the example of FIG. 4, and the dimple area ratio calculated using Equation (1) is shown in the following table. We summarized in 1.

Golf ball
diameter
(mm) Golf ball
area
(mm ² ) Dimple
group Dimple
diameter
(mm) Unit dimple area
(mm ² ) Dimple
Count Dimple
Total area
(mm ² ) Dimple
Area ratio 42.9 5781.819 One 4.953 19.332 80 1546.575 84.37% =
4878.267 /
5781.819 2 4.826 18.350 72 1321.227 3 4.572 16.464 24 395.141 4 4.445 15.560 72 1120.305 5 4.064 13.001 24 312.023 6 2.921 6.709 24 161.016 7 2.159 3.663 6 21.980 302 4878.267

As can be seen from Table 1, the dimple arrangement according to the present invention, since the dimple area ratio of 84.37%, which is larger than 82% known as the conventional maximum, is possible when the dimple diameter is acceptable in a standard size golf ball. At the same time, the lift is increased and the drag is reduced.

The foregoing is a description of specific embodiments of the present invention. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments or constructions. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It should be understood that this is possible. It is therefore to be understood that all such modifications and alterations are intended to fall within the scope of the invention as disclosed in the following claims or their equivalents.

10: golf ball
12a, 12b, 12c, 12d: spherical triangle area
14a, 14b, 14c: spherical rectangular area
20: circular segment group
21: horizontal dividing line
22,23,24: sloped dividing line
22a, 22b, 23a, 23b, 24a, 24b: intersection of intersection lines
25: Equator
25a: Intersection of equator and dimple waveform lines
DG1: first dimple group
DG2: Second Dimple Group
DG3: Third Dimple Group
DG4: Fourth Dimple Group
DG5, DG5a, DG5b, DG5c: Fifth Dimple Group
DGS: Dimple permutation set near the equator
30: dimple waveform line
θ: face angle
ω: separation angle
l: thickness

Claims (16)

A horizontal dividing line on which the surface of the golf ball divides the golf ball up and down; Three inclined partition lines having a plane angle of 60 degrees with the horizontal partition line and intersecting the horizontal partition line at equal intervals along the horizontal partition line, wherein four globular triangular regions and three globular rectangular regions are the upper and lower hemisphere surfaces of the golf ball. Formed symmetrically on each,
And a circular dimple group is densely arranged at each of the spherical triangular region and the spherical rectangular region and its boundary.
The golf ball of claim 1, wherein the dimple groups have different diameter sizes.
The golf ball according to claim 2, wherein the groups of dimples of different diameter sizes are symmetrically formed at the boundary with the inside of the spherical triangle and the spherical rectangle.
The golf ball of claim 2, wherein the spherical triangular regions are arranged in groups of dimples of the same diameter size.
5. A golf ball according to claim 4, wherein the spherical triangular regions are arranged in groups of dimples having the largest diameter size.
The golf ball of claim 2, wherein the spherical rectangular regions are arranged in groups of dimples having different diameter sizes.
7. The golf ball according to claim 6, wherein the spherical rectangular area has a smaller diameter size of the dimple from the boundary to the center direction.
8. The dimple group according to claim 2, wherein the different diameter size dimple groups are
A first dimple group disposed within the spherical triangular region and being densely arranged on the sides of the spherical triangle at the same time;
A second dimple group disposed at a boundary between the spherical triangular regions in contact with the spherical triangular regions and at the same time arranged in a dense manner with the first dimple group and occupying a part of the spherical triangular regions; And
And a third dimple group disposed densely with the first and second dimple groups at a vertex boundary of the globular quadrangle, and occupying a portion of the spherical triangular region.
The method of claim 8, wherein the waveform formed by the first dimple group, the second dimple group, and the third dimple group vibrates in a vertical waveform about a boundary line between the spherical triangular region and the spherical rectangular region. A golf ball, characterized in that.
The golf ball according to claim 9, wherein an amplitude of the wave line is more than 0 and 2 mm or less.
10. The golf ball according to claim 9, wherein the golf ball is molded by using a vertical mold having a gate formed at a portion where the corrugated line and the boundary line cross each other.
The method of claim 8, wherein the different diameter size dimple group,
A fourth dimple group disposed within the spherical rectangular area at the same time and dense with the second dimple group, and sequentially disposed from a boundary of the second dimple group; And
Different diameter sizes, arranged in the direction of the center of the region at the vertices of the spherical rectangular region, each dimple disposed so as to occupy the maximum surface of the golf ball not occupied by the second to fourth dimple groups. And a fifth dimple group having a golf ball.
The golf ball according to claim 12, wherein the first to fifth dimple groups are sequentially smaller in diameter size.
13. The golf ball according to claim 12, wherein the area ratio of the dimple group is 84% or more with respect to the golf ball surface.
The golf ball according to any one of claims 2 to 7, wherein the diameter of the dimple group is 2 mm to 6 mm.
The golf ball according to any one of claims 2 to 7, wherein an area percentage of the dimple group is 84% or more with respect to the golf ball surface.

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