JP2008132171A - Golf ball for practice - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf ball suitable for practicing golf. <P>SOLUTION: A golf ball for practice is provided with a sphere body 12, a first protrusion 14, and a second protrusion 16. The first protrusion 14 and the second protrusion 16 are placed respectively on the surface of the sphere body 12 in a way that they project in symmetric direction across its center point C. The first protrusion 14 and the second protrusion 16 are in an approximately conical shape that is symmetric about the axis of rotation. The first protrusion 14 and the second protrusion 16 so that their respective axis 30 of rotation may be placed in the positions on a same straight line L which runs through the center point C of the sphere body 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a golf ball, and more particularly to a practice golf ball used for golf practice.

Conventionally, various practice golf balls have been proposed for practicing golf in a golf driving range or a home garden. For example, Patent Document 1 proposes a practice golf ball having a mass larger than that of a competition golf ball.
JP 2000-107338 A

  By the way, in order to fly the golf ball straight in the aimed direction, it is important to hit the ball with the club face at a right angle to the aimed direction. Striking a ball when the face is not perpendicular to the target direction causes slice balls and hook balls.

  The present invention has been made in view of such a situation, and an object thereof is to provide a golf ball suitable for golf practice.

  In order to solve the above-described problems, a golf ball for practice according to an aspect of the present invention is disposed on the surface of the sphere portion so as to protrude in a symmetric direction around the center point of the sphere portion and the sphere portion. A first protrusion and a second protrusion.

  The practice golf ball according to this aspect is set so that the axis of the ball is parallel to the ground when a straight line connecting the sphere, the first protrusion, and the second protrusion is the axis of the ball. Is done. When the user hits the golf ball for practice with a golf club, the ball axis and the axis on which the ball actually rotates are shifted unless the club face and the axis of the ball are in contact with each other. Therefore, it is impossible to fly the ball straight. Therefore, by practicing shots using this golf ball for practice, the drawbacks of the swing form can be clearly recognized and the swing form can be corrected effectively.

  The first protrusion and the second protrusion may have substantially the same shape. Further, the shape may be symmetrical about the rotational axis. The first projecting portion and the second projecting portion may be provided such that the rotational axes of the respective shapes are located on the same straight line passing through the center point of the sphere portion. The first protrusion and the second protrusion may be substantially conical. In this case, a golf ball for practice having symmetry can be formed.

  A line may be provided along the equator of the sphere when the positions where the first protrusion and the second protrusion are disposed are the poles of the sphere. In this case, if the practice golf ball does not roll straight, the line width appears to be thick. Therefore, the user can recognize the defect of his / her swing form more finely by observing the line together with the bending of the ball by the first protrusion and the second protrusion.

  At least one of the sphere, the first protrusion, and the second protrusion may have a different surface color. In this case, when the ball flies in a state where the ball axis and the rotation axis of the ball are deviated, the user mixes at least one color of the sphere, the first protrusion, and the second protrusion, The color of the ball appears to have changed. Thereby, the user can recognize that his swing form is not appropriate.

  The spherical body portion, the first protrusion portion, and the second protrusion portion may be integrally formed. In this case, since there is no possibility that the first protrusion and the second protrusion are separated from the sphere, the durability of the ball can be improved.

  According to the present invention, a golf ball suitable for golf practice can be provided.

  FIG. 1 is a diagram showing a practice golf ball 10 according to an embodiment of the present invention. As shown in FIG. 1, the practice golf ball 10 includes a spherical body portion 12, a first protrusion portion 14, a second protrusion portion 16, and dimples 18.

  The spherical body portion 12 is a spherical object, and may be a golf ball that conforms to standards defined by the British Golf Association (R & A), the American Golf Association (USGA), the Japan Golf Association (JGA), or the like. For example, R & A specifies that the weight of a ball is 45.93 g or less and the ball diameter is 42.67 mm or more. The structure of the sphere 12 is not particularly limited, and a one-piece ball in which some chemicals are mixed with high resilience synthetic rubber and heated and molded in a mold, or a synthetic resin cover that is not easily damaged by the center of the synthetic rubber Golf balls with various structures, such as a two-piece ball made by integrally molding the two, can be used.

  A plurality of dimples 18 are formed on the surface of the spherical portion 12. By forming the dimple 18 on the sphere 12, the flight distance of the ball can be extended. Depending on the dimple depth, diameter, number, arrangement, etc., the ball trajectory, flight distance, etc. vary, but these are not particularly limited.

  The golf ball for practice 10 according to the present embodiment includes a first protrusion 14 and a second protrusion 16. The 1st projection part 14 and the 2nd projection part 16 are substantially cone-shaped objects, and are attached to the surface of the spherical body part 12 through an adhesive layer. Below, the 1st projection part 14 and the 2nd projection part 16 are demonstrated in detail.

  FIG. 2 is a cross-sectional view of the practice golf ball 10 shown in FIG. In FIG. 2, the structure inside the sphere part 12, that is, the core and the cover are not shown. In the following, when the first protrusion 14 and the second protrusion 16 are collectively referred to, they are simply referred to as “protrusion 22”.

  As described above, the protruding portion 22 is a substantially conical object, and includes the side surface portion 24, the bottom surface portion 26, and the apex portion 28. The material for forming the protrusion 22 is not particularly limited as long as it can be molded, such as rubber, metal, resin, and the like. As shown in FIG. 2, the bottom surface portion 26 is formed in a spherical shape so as to engage with the spherical body portion 12. The side surface portion 24 is a conical surface having a rotation axis 30 as a straight line connecting the vertex portion 28 and the center 26 a of the bottom surface portion 26. The side part 24 is formed symmetrically about the rotational axis, and the side formed by the side part 24 and the bottom part 26 is circular.

  As for the 1st projection part 14 and the 2nd projection part 16, each bottom face part 26 is attached to the spherical surface part 12 surface via the contact bonding layer 20. FIG. The kind of the adhesive layer 20 is not particularly limited, and examples thereof include an adhesive and a double-sided tape. An optimum bonding member may be used in consideration of the material of the surface of the sphere 12 and the material of the protrusion 22. In the present embodiment, the first protrusion 14 and the second protrusion 16 can be manufactured simply by attaching them to an existing golf ball. Therefore, the ball is not particularly selected, which is advantageous in terms of cost.

  The 1st projection part 14 and the 2nd projection part 16 are each arrange | positioned by the spherical body part 12 surface so that it may protrude in the symmetrical direction centering | focusing on the center point C of the spherical body part 12. FIG. As shown in FIG. 2, the first protrusions 14 and the second protrusions 16 are provided such that the rotation shafts 30 of the respective shapes are located on the same straight line L that passes through the center point C of the sphere part 12. (Hereinafter, the straight line L is referred to as a ball axis L). In order to maintain symmetry, it is preferable that the first protrusion 14 and the second protrusion 16 have substantially the same shape.

  FIG. 3 is a view for explaining a method of using the practice golf ball 10 according to the embodiment of the present invention. In FIG. 3, the case where putting practice is performed by the putter 40 will be described as an example.

  When practicing putting using the practice golf ball 10, first, the practice golf ball 10 is placed on the ground such that the ball axis L is parallel to the ground. When the ball portion 12 of the practice golf ball 10 is hit in a state where the ball axis L and the putter face 40a are parallel, the ball axis L and the rotation axis of the practice golf ball 10 coincide with each other. Can be rolled straight in the direction of arrow A perpendicular to the axis. If the ball portion 12 of the practice golf ball 10 is hit in a state where the ball axis L and the putter face 40a are not parallel, the ball axis L and the rotation axis of the ball are displaced, so the practice golf ball 10 rolls straight. Instead, it bends in the direction of arrows B and C.

  Since a normal golf ball is a sphere, the ball does not have a single axis of rotation, and the ball rolls straight even if the target direction and the putter face are not perpendicular. In the golf ball for practice 10 according to the present embodiment, since the first protrusion 14 and the second protrusion 16 are provided, the ideal rotation axis of the ball becomes one. If is not parallel, the ball cannot be rolled straight. By practicing putting using such a golf ball 10 for practice, the defects of its own foam are clearly recognized and the foam can be corrected effectively.

  In FIG. 3, the case where the practice golf ball 10 is used for putting practice has been described. However, the practice golf ball 10 can also be used for practice of a shot with an iron. When the practice golf ball 10 is hit in a state where the iron face is not parallel to the ball axis L, the practice golf ball 10 has the first axis of the ball because the ball axis L and the rotation axis of the ball are misaligned. The projecting portion 14 side and the second projecting portion 16 side receive different air resistances and fly as extreme slice balls or hook balls. That is, the ball bends faster than when a normal golf ball is hit.

  For example, when a golf practice field is small, the player reaches the net immediately after hitting the ball, so that it may not be possible to check whether the hit ball is a slice ball or a hook ball. In such a case, by using the practice golf ball 10 according to the embodiment of the present invention, since the ball bends faster than when a normal golf ball is hit, it is easy to check the swing.

  FIG. 4 is a diagram for explaining the size of the protrusion 22. In FIG. 4, illustration of the adhesive layer is omitted. If the protrusion 22 is too large, the club face may come into contact with the first protrusion 14 and the second protrusion 16 when the golf ball 10 for practice is hit. Therefore, the spherical portion 12 of the practice golf ball 10 needs a spherical area (hereinafter referred to as a hitting area) where a club face of a certain size contacts.

  Therefore, in the practice golf ball 10 according to the present embodiment, when the radius of the sphere portion 12 is R, and the perpendicular line dropped from the side formed by the side surface portion 24 and the bottom surface portion 26 to the ball axis L is r, r is preferably 3/4 or less of R, and r is preferably 1/2 or less of R. By forming the protrusions 22 in such a size, it is possible to ensure a moderately sized hitting region.

  Moreover, when the projection part 22 is too small, since the adhesion area with the spherical body part 12 cannot be secured sufficiently, the projection part 22 is easily detached. Furthermore, when the projection part 22 is too small, the effect of this Embodiment as mentioned above will become small.

  Therefore, in the practice golf ball 10, r is preferably 1/8 or more of R, and more preferably r is 1/4 or more of R. By forming the protrusion 22 in such a size, the degree of adhesion of the protrusion 22 can be improved, and the effects of the present embodiment can be suitably generated.

  The height h of the protrusion 22, which is the distance from the apex 28 to the center 26 a of the bottom 26, is preferably less than or equal to ½ of the radius R of the sphere 12. This is because if the height h of the protruding portion 22 is too large, the first protruding portion 14 comes into contact with the ground immediately when the practice golf ball 10 is bent and rolled. Moreover, it is preferable that the height h of the protrusion 22 is ¼ or more of the radius R of the sphere 12. This is because if the height h of the protrusion 22 is too small, the above-described effects of the present embodiment cannot be suitably generated.

  FIG. 5 is a view showing a modified example of the practice golf ball according to the present embodiment. The practice golf ball 50 shown in FIG. 5 is different from the practice golf ball 10 shown in FIG. 1 in that it has a line 52 provided along the equator of the sphere 12. The other components are the same as those in the practice golf ball 10 shown in FIG. 1 and are denoted by the same reference numerals.

  The line 52 is provided along the equator of the spherical portion 12 when the positions where the first protruding portion 14 and the second protruding portion 16 are disposed are the poles of the spherical portion 12. Both poles of the sphere 12 correspond to two points where the ball axis L intersects the sphere 12. This line 52 may be provided using, for example, an oil pen. The line width of the line 52 may be about 1 mm to 3 mm.

  The practice golf ball 50 shown in FIG. 5 is also used in the same manner as the practice golf ball 10 described with reference to FIG. Since the practice golf ball 50 is provided with a line 52 along the equator with respect to the ball axis L, if the practice golf ball 50 does not roll straight, the width of the line 52 looks thick. Accordingly, the user can recognize the defects of his / her foam more finely by observing the line 52 together with the ball being bent by the first protrusion 14 and the second protrusion 16.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and various modifications can be made to combinations of the respective constituent elements. Those skilled in the art will appreciate that such modifications are also within the scope of the present invention.

  For example, at least one of the sphere, the first protrusion, and the second protrusion may be formed so that the surface color is different. When the golf ball for practice is configured in this way, when the ball flies with the ball axis and the rotation axis of the ball deviating from each other, the user moves the sphere, the first protrusion, and the second protrusion. It appears that at least one of the colors is mixed and the color of the ball has changed. Thereby, the user can recognize that his swing form is not appropriate.

  Moreover, in this Embodiment, although the projection part was formed in the substantially cone shape, the shape of a projection part is not restricted to this, What is necessary is just a rotational axis symmetrical shape. For example, the protrusion may have a substantially cylindrical shape or a substantially truncated cone shape.

  In the present embodiment, the first protrusion and the second protrusion are attached to the sphere through the adhesive layer, but at the time of ball molding, the sphere, the first protrusion, and the second protrusion are You may form integrally. In this case, there is no fear that the first protrusion and the second protrusion are peeled off from the sphere, which is advantageous from the viewpoint of the durability of the ball.

It is a figure showing a golf ball for practice concerning an embodiment of the invention. It is sectional drawing of the golf ball for practice shown in FIG. It is a figure for demonstrating the usage method of the golf ball for practice which concerns on embodiment of this invention. It is a figure for demonstrating the magnitude | size of a projection part. It is a figure which shows the modification of the golf ball for practice which concerns on this Embodiment.

Explanation of symbols

  10, 50 Practice golf ball, 12 sphere, 14 first protrusion, 16 second protrusion, 18 dimple, 20 adhesive layer, 22 protrusion, 24 side face, 26 bottom face, 28 apex, 30 rotation axis , 40 putters, 52 lines, L ball axis.

Claims (8)

A sphere,
A first protrusion and a second protrusion respectively disposed on the surface of the sphere so as to protrude in a symmetrical direction around the center point of the sphere;
A golf ball for practice characterized by comprising:   The golf ball for practice according to claim 1, wherein the first protrusion and the second protrusion have substantially the same shape.   The practice golf ball according to claim 1, wherein the first protrusion and the second protrusion have a rotationally symmetric shape.   The said 1st projection part and the said 2nd projection part are provided so that the rotational axis of each shape may be located on the same straight line passing through the center point of the said spherical body part. Golf ball for practice.   The golf ball for practice according to claim 1, wherein the first protrusion and the second protrusion have a substantially conical shape.   6. A line is provided along the equator of the sphere when the positions where the first and second protrusions are disposed are the poles of the sphere. A golf ball for practice according to any one of the above.   The practice golf ball according to claim 1, wherein at least one of the spherical body portion, the first protrusion portion, and the second protrusion portion has a different surface color.   The practice golf ball according to claim 1, wherein the spherical body portion, the first protrusion portion, and the second protrusion portion are integrally formed.

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