JP2003010374A - Putter for golf - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf putter by which a height for hitting a golf ball is normally made to be stable and the hit ball is surely made to roll on the ground by forward spinning. SOLUTION: The golf putter is provided with a head 20 with a face 21 for hitting the golf ball B. The putter is constituted to position the most projecting part of the face 21 at a place where the height from the bottom part 22 of the head is equal to or more than the radius r of the golf ball B. By the configuration, then the golf ball B is hit at a position a little upper than the height of the radius of the golf ball B on the face 21 and a part from the lower part of the face 21 to the bottom 22 of the head is made to be an arc shape without a corner by regression.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a golf putter.

[0002]

2. Description of the Related Art Typical examples of conventional golf putters are shown in FIGS. Reference numeral 1 is a shaft and 2 is a head. The head 2 is provided with a face surface 2a for hitting the golf ball B, and the golf ball B is hit at any position on the face surface 2a.

[0003]

However, when the above-mentioned conventional putter is used, since the hit position with respect to the golf ball B has a high degree of freedom, the center (radius of the golf ball B as shown by the arrow in FIG. Hit below the height), hit the center of golf ball B as indicated by the arrow B, or hit above the center of golf ball B as indicated by the arrow C. There was a problem that it was not decided. When the hit heights are scattered above and below the center of the golf ball B, the direction of rotation of the hit golf ball B is forward or reverse, or the golf ball B jumps into the air or the ground (lawn). There is a problem that the rolling distance of the golf ball B is not stable because the state of the hit golf ball B changes each time due to a slight difference in the height of the hit such as sliding up.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional golf putters, makes it possible to constantly stabilize the hit height with respect to the golf ball, and ensures that the hit ball is rotated in the forward direction to ensure that it hits the ground. The challenge is to provide a golf putter that can be rolled.

[0005]

A golf putter according to the present invention for solving the above-mentioned problems is a golf putter having a head having a face surface for hitting a golf ball, and the height from the bottom of the head is the golf putter. By configuring the most prominent portion of the face surface to be located at or above the radius of the ball, the face surface always hits the golf ball at a position slightly above the radial height of the golf ball. The first feature is that the portion from the lower portion of the face surface to the bottom portion of the head is made to recede in an arc shape without corners. Further, in addition to the first characteristic, the golf putter of the present invention has the vertical cross section of the face surface as a part of an arc having a radius of curvature of the golf ball or a radius of curvature larger than that, at least from the bottom of the head to the golf ball. The second feature is that the structure is continuously formed up to a height position that slightly exceeds the radius of. Further, in addition to the first characteristic, the golf putter of the present invention has the bulging portion by forming a bulging portion at a position of the face surface whose height from the head bottom portion is equal to or greater than the radius of the golf ball. Part 3 is designed to always hit a position slightly above the radial height of the golf ball.
It is a feature of. A fourth feature of the golf putter of the present invention is that a mark indicating the horizontal hit position of the putter head that should hit the golf ball is provided on the upper surface of the head. In addition to the above-mentioned fourth characteristic, the golf putter of the present invention is characterized in that the mark is a picture of a golf ball having the same size as the golf ball shown on the upper surface of the head. I am trying.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the golf putter of the present invention will be further described with reference to the following drawings.
1 to 8 show essential parts of a golf putter showing respective first to eighth embodiments of the present invention, (A) is a perspective view,
(B) is a sectional view. FIG. 9: shows the principal part of the golf putter which shows the 9th Embodiment of this invention, (A) is a perspective view,
(B) is a plan view. FIG. 10 is a plan view of an essential part of a golf putter showing a tenth embodiment of the present invention.

First, the first embodiment shown in FIG. 1 will be described. Reference numeral 10 is a putter shaft, and 20 is a putter head. In the putter of this embodiment, the head 20 itself has a columnar shape. The cross section of the head 20 is formed in a circular shape so that its radius of curvature R is larger than the radius r of the golf ball B. In other words, the head 20 is formed by continuously connecting the bottom portion 22 to the face surface 21 with a circular cross section having a radius of curvature R. With the above configuration, when the golf ball B having the radius r and the head 20 having the radius of curvature R larger than the radius r are placed on the ground G and brought into contact with each other, the face surface 21 of the head 20 becomes Be sure to contact the golf ball B at a position slightly above the radial height (center) of the golf ball B. That is, the vertical hit position P1 on the face surface 21 of the head 20 is always located slightly above the center of the golf ball B. Therefore, a person using a putter can surely hit a little above the center (radius height) of the golf ball B by performing a putting operation so that the bottom portion 22 of the head 20 moves in parallel along the ground G. it can. As a result, the hit golf ball B does not jump up and does not rotate in the reverse direction, and always rolls in a positive rotation on the ground in a stable and reliable manner.

Further, since the portion Q from the lower portion of the face surface 21 of the head 20 to the bottom portion 22 of the head 20 is formed into an arc shape that smoothly recedes without corners, the edge of the head 20 is put on the ground G when putting. It is surely prevented from being caught in. In the above description, the radius of curvature R of the cross section of the head 20 is the radius r of the golf ball B.
May be the same as. In putting, when the bottom portion 22 of the head 20 is translated along the ground G and hits the golf ball, the bottom portion 22 is slightly separated from the ground G, so that the face surface 21 is substantially the same as the golf ball B. It will hit a little above the center. Further, the radius of curvature R of the cross section of the head 20 need not be constant. That is, it need not be an exact circle.

The second embodiment shown in FIG. 2 is a modification of the circular cross-section head 20 of the first embodiment. That is, head 2
By cutting the upper part of 0, the upper part of the head 20 is made into a horizontal cut surface 23. This makes head 2
The height of 0 can be prevented from becoming too high with respect to the golf ball B, and the edge 2 of the cut surface 23 can be prevented.
3a is a line perpendicular to the moving direction of the head 20,
It can serve as a reference line for adjusting the orientation of the head 20 with respect to the golf ball B when viewed from above. Note that members and elements that perform the same functions as those of the parts of the putter shown in FIG. 1 are indicated by the same reference numerals. Also in the putter of the present embodiment, the vertical hit position P1 on the face surface 21 is always the center of the golf ball B by setting the arc-shaped curvature radius R of the cross section of the head 20 to be larger than the radius r of the golf ball B. It can be set slightly higher. The golf ball B hit by this reliably rolls on the ground G. Moreover, it always rolls in forward rotation. A portion Q from the lower portion of the face surface 21 to the bottom portion 22 is formed in an arc shape that smoothly retreats, so that the edge of the head 20 does not get caught on the ground G during putting. .

The third embodiment shown in FIG. 3 is also a modification of the first embodiment. The head 20 of FIGS. 1 and 2 has a circular cross section, but is not circular in this embodiment. In the present embodiment, the upper portion of the head 20 is cut to form a horizontal cut surface 23, and the arc portion on the side opposite to the face surface 21 is also cut to form a cut surface 24. The action of the cut surface 23 is the same as the action of the cut surface 23 in the second embodiment. The cut surface 24 prevents the head 20 from becoming too large. In the putter of the present invention, it is sufficient that the arc shape having the radius of curvature R exists from the face surface 21 facing the golf ball B to the bottom portion 22. In addition, in the present embodiment and the above-described embodiments, if the bottom portion 22 is formed in a horizontal plane with an appropriate width, the bottom portion 22 is temporarily brought into contact with the ground G at the time of putting, and the posture of the putter is confirmed. It becomes easy to move the head 20 in a state along the line G. As a result, the putting operation can be performed on a more stable trajectory. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted.

Also in the putter of this embodiment, the head 2
By setting the radius of curvature R of the 0 cross section to be larger than or equal to the radius r of the golf ball B, it is possible to ensure that the vertical hit position P1 on the face surface 21 is slightly above the center of the golf ball B. it can. As a result, the golf ball B hit by the head 20 rolls on the ground G without fail while rotating positively. Further, since the edge is eliminated by making the portion Q from the lower portion of the face surface 21 to the bottom portion 22 of the head 20 into a smooth arc shape and retreating, the edge of the head 20 is surely caught on the ground G during putting. This prevents the putting operation from failing.

The fourth embodiment shown in FIG. 4 is also a modification of the first embodiment. In this embodiment, the head 20 itself has an arcuate cross section. Head 20
The face surface 21 has a radius of curvature R of its vertical cross section that is equal to or greater than the radius r of the golf ball B, and the height from the bottom portion 22 to the upper end of the face surface 21 is higher than the radius height of the golf ball B. This is the same as in the above-described embodiment. Further, the portion Q from the lower portion of the face surface 21 to the bottom portion 22 is receded in an arc shape so that no edge is generated, as in the case of the above-described embodiment. The bottom portion 22 is formed in a horizontal plane having a width so that the bottom portion 22 can be temporarily brought into contact with the ground G to check the posture of the putter during putting, and the head 20 can be placed on the ground G. It is easy to move along. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 to 3 are designated by the same reference numerals, and description thereof will be omitted. Also in the putter of this embodiment, the head 2
The radius of curvature R of the 0 cross section is set to be larger than or equal to the radius r of the golf ball B so that the vertical hit position P1 of the face surface 21 is always slightly above the center of the golf ball B. The golf ball B thus rolled surely rolls on the ground G while rotating positively. Further, the edge of the head 20 is prevented from being caught on the ground G during putting.

The fifth embodiment shown in FIG. 5 is also a modification of the first embodiment. In this embodiment, the head 20 is formed by cutting a cylinder so that its cross section has a crescent shape. The face surface 21 of the head 20 has an arcuate shape in which the radius of curvature R of its vertical cross section is the radius r of the golf ball B or larger, and the height from the bottom portion 22 to the upper end of the face surface 21 is higher than the radius height of the golf ball B. As a result, the vertical hit position P1 on the face surface 21 is always positioned slightly above the center of the golf ball B. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 to 4 are designated by the same reference numerals, and description thereof will be omitted. Also in the putter of the present embodiment, the radius of curvature R of the cross section of the head 20 is set to be larger than or equal to the radius r of the golf ball B, and the vertical hit position P1 of the face surface 21 is set.
Is always positioned slightly above the center of the golf ball B, so that the hit golf ball B can roll on the ground G without fail while rotating positively.

FIG. 6 shows a putter according to a sixth embodiment of the present invention. In this embodiment, the face surface 21 of the head 20
Is not a curved surface but a flat surface, and is inclined so as to project forward from the bottom to the top. Of course, the upper end of the face surface 21 is higher than the radial height of the golf ball B. By doing so, the face surface 21 is always positioned slightly above the center of the golf ball B.
Will come into contact with. That is, the vertical hit position P1 on the face surface 21 is slightly above the center of the golf ball B. A portion Q from the lower portion of the face surface 21 to the bottom portion 22 is receded in an arc shape so that no edge is generated. The bottom 22 is a horizontal surface having a width, and the bottom 22 is temporarily grounded during putting.
It is possible to confirm the posture of the putter by contacting the upper surface, and it is easy to move the head 20 along the ground G. The upper surface of the head 20 is a cut surface 23 cut in a horizontal plane. As a result, the head 20
Can be prevented from becoming too high with respect to the golf ball B, and the edge 23 of the cut surface 23 can be prevented.
a can serve as a line perpendicular to the advancing / retreating direction of the head 20 and can serve as a reference line for adjusting the orientation of the head 20 with respect to the golf ball B when viewed from above.
The head 20 is prevented from becoming too large by forming a cut surface 24 in a shape in which an arc portion on the side opposite to the face surface 21 is also cut. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 to 5 are designated by the same reference numerals,
The description is omitted.

With the above construction, when the golf ball B and the head 20 having the inclined face surface 21 are placed on the ground and brought into contact with each other, the face surface 21 of the head 20 is always the golf ball B. The golf ball B is abutted at a position slightly above the radial height (center). That is, the vertical hit position P1 on the face surface 21 of the head 20 is always slightly above the center of the golf ball B. Therefore, the person who uses the putter is the bottom 2 of the head 20.
By performing the putting operation so that 2 moves in parallel along the ground G, it is possible to reliably hit a little above the center (radius height) of the golf ball B. Thus, the hit golf ball B does not jump up and does not rotate in the reverse direction, and always rolls on the ground in a positive rotation with a stable rotation. Further, since the portion Q from the lower part of the face surface 21 of the head 20 to the bottom portion 22 of the head 20 is made to recede in an arc shape so as to prevent an edge from being generated, the head 20 is put at the time of putting.
Can be prevented from being caught on the ground G.

The seventh embodiment shown in FIG. 7 is a modification of the above-described sixth embodiment. That is, when the face surface 21 is an inclined surface, there is a possibility that the upper end of the face surface 21 protrudes too much toward the golf ball B side, and it may be difficult to aim at the time of putting. Therefore, the face surface 21 above the vertical hit position P1 may be difficult. Is a cut surface 25 that is cut at a vertical angle or more, so that the golf ball B and the like can be easily seen from above. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 to 6 are designated by the same reference numerals, and description thereof will be omitted. The effects of this embodiment are similar to those of the putter of the sixth embodiment.

FIG. 8 shows a putter according to the eighth embodiment of the present invention. In this embodiment, the radius r of the golf ball B is
Or, the bulging portion 2 is provided at the position of the face surface 21 beyond that.
When the golf ball B and the head 20 are placed on the ground G, the bulging portion 26 contacts the golf ball B at a position slightly above the center (radius height) of the golf ball B. I have to. That is, the vertical hit position P1 on the face surface 21 is slightly above the center of the golf ball B. A portion Q from the lower portion of the face surface 21 of the head 20 to the bottom portion 22 of the head 20 is configured to recede in an arc shape. Also, the bottom 22 of the head 20
Is a horizontal plane with a width. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 to 7 are designated by the same reference numerals and the description thereof will be omitted. According to this embodiment,
When the putter is moved along the ground G, the bulging portion 26 of the face surface 21 always hits a position slightly above the radial height (center) of the golf ball B. Therefore, the hit golf ball B rolls on the ground G without jumping up, and does not rotate in the reverse direction, but always stably rotates normally on the ground G. Of course, since the portion Q from the lower portion of the face surface 21 of the head 20 to the bottom portion 22 of the head 20 is made to recede in an arc shape so as to prevent an edge from occurring, the head 2 is not allowed during putting.
It is possible to prevent 0 from being caught on the ground G and to move smoothly.

In the above first to fifth embodiments,
By constructing the face surface 21 as an arc having a radius r of the golf ball B or a radius of curvature R larger than that, and by arranging this arc to reach a position exceeding the radial height of the golf ball B, The face surface 21 always hits the golf ball B at a position slightly above the radial height (center) of the golf ball B. In addition, in the sixth to seventh embodiments, the face surface 21 is a flat surface that is inclined so as to project forward from the lower side to the upper side, and the upper end of the face surface 21 is greater than the radial height of the golf ball B. By being configured to reach a high position, the face surface 21 always hits the golf ball B at a position slightly above the radial height (center) of the golf ball B.

However, the present invention is not limited to the above first to eighth embodiments. In short, head 2
The height of the 0 from the bottom portion 22 of the golf ball B is equal to or more than the radial height (center) of the golf ball B, and the most protruding portion of the face surface 21 is located at the position of the face surface 21. When B and the head 20 are placed side by side on the ground G and brought into contact with each other, the position of the most projecting portion or the face surface slightly below the most projecting portion must be slightly above the radial height (center) of the golf ball B. The golf ball B at the position of (the vertical hit position P1),
It may be configured so as not to come into contact with other positions.
In the case where the most projecting portion is a plane in which the face surface 21 uniformly projects from the bottom to the top (as shown in FIG. 6), the upper end portion of the face surface 21 becomes the most projecting portion. By configuring this most protruding portion to have a radial height of the golf ball B or a height higher than the radial height, the vertical hit position P1 of the face surface 21 is always adjusted to a position that slightly exceeds the radial height of the golf ball B. be able to. When the face surface 21 has an arc cross section (see FIGS. 1 and 2).
Etc.), the radius (curvature radius) R of the circular arc is made larger than the radius r of the golf ball B,
The face surface 2 is located at a position exceeding the radial height of the golf ball B.
The most prominent portion of No. 1 can be located, and the vertical hit position P1 can be adjusted so as to be a position slightly higher than the radial height of the golf ball B.

FIG. 9 shows a ninth embodiment of the present invention. In this embodiment, a picture 27 of a golf ball having the same size as the golf ball B is displayed on the upper surface of the head 20. The upper surface of the head 20 is a cut surface 23 that is a horizontal surface.
The tip point 27 of the picture 27 of the golf ball on the edge 23a of 3
It is drawn that a contacts one point. The golf ball picture 27 serves as a mark for indicating at which horizontal position of the head 20 the golf ball B should be hit. That is, the horizontal hit position P2 of the head 20 which should hit the golf ball 20 is indicated by the position of the tip point 27a of the picture 27 of the golf ball. Then, the tip point 27a is made to coincide with the tip point of the golf ball B, and the left and right end points 27b, 27 of the picture 27 of the golf ball.
The position of the head 20 is corrected by translating the line of sight from c so as to match the left and right end points of the golf ball B. This makes it possible to more clearly grasp the positional relationship with the golf ball B in the width direction. Therefore, the person who uses the putter should use the head 2 of the putter before the actual production.
Picture 27 of the golf ball drawn above
So that the track extends to the side of the golf ball B
The orbit of the putter can be confirmed in advance by imagining it so that it exactly overlaps with. The golf ball picture 27 can be drawn on a curved surface other than a horizontal plane. In this case, the picture seen from above should be a golf ball. Further, although the outer shape of the picture 27 of the golf ball is sufficient, it is necessary to draw at least a range (more than half) from the tip point 27a to the area including the left and right end points 27b and 27c. Members and elements having the same functions as those of the parts of the above-described putter shown in FIGS. 1 to 8 are designated by the same reference numerals, and the description thereof will be omitted.

In the ninth embodiment, the golf ball B can be hit at the horizontal hit position P2 of the putter by using the picture 27 of the golf ball of the same size as a mark.
It is possible that the mark is not the golf ball picture 27. For example, as shown in FIG. 10, it is possible to adopt one or a plurality of simple marks in combination. FIG. 10 shows a tenth embodiment of the present invention. In this embodiment, the horizontal hit position P2 of the head 20 to hit the golf ball 20 is indicated by the mark S1, and the width (diameter) position of the golf ball B is indicated by the marks S2 and S3. Mark S
1, S2, S3 are provided close to the edge 23a.
Even with this configuration, the position of the head 20 can be adjusted and checked in advance with respect to the center and width of the golf ball B to be hit. The mark may be only the mark S1 indicating the horizontal hit position P2.

[0022]

According to the golf putter according to the first aspect of the present invention, the golf putter has a head having a face surface for hitting a golf ball. By constructing the most projecting portion of the face surface at a position where the height from the bottom is equal to or greater than the radius of the golf ball, the golf ball is always positioned slightly above the radial height of the golf ball. In addition to making it hit, the person who uses the putter, because it is configured to retreat from the lower part of the face surface to the bottom of the head in an arc shape without corners,
By performing the putting operation so that the bottom portion of the head moves in parallel along the ground, it is possible to surely hit a little above the center (radius height) of the golf ball at any time. Therefore, the golf ball can be rolled along the ground without jumping up. In addition, it can always roll on the ground in a positive rotation without causing reverse rotation. Therefore, it becomes possible to stably provide the moving distance of the golf ball according to the hitting force, and it is possible to reliably obtain the distance close to the desired distance. In addition, the part from the lower part of the head face surface to the bottom part of the head is formed into an arc shape that smoothly retreats without corners, so it is possible to reliably prevent the head edge from getting caught on the ground when putting. be able to. According to the golf putter described in claim 2, in addition to the effect obtained by the configuration described in claim 1, the vertical cross section of the face surface has an arc of a radius of the golf ball or a curvature radius larger than that. As part of the structure, it is constructed continuously from at least the bottom of the head to a height position that slightly exceeds the radius of the golf ball. You can hit a little above. According to the golf putter described in claim 3, in addition to the effect of the configuration described in claim 1, the height from the bottom of the head bulges to the position of the face surface that exceeds or exceeds the radius of the golf ball. Since the bulging portion always hits a position slightly higher than the radial height of the golf ball by configuring the portion, the face surface whose height from the bottom of the head exceeds the radius of the golf ball or exceeds it With a putter having a bulging portion at the position of, it is possible to surely hit at a position slightly above the center of the golf ball. Further, according to the golf putter of claim 4, since the mark indicating the horizontal hit position of the putter head which should hit the golf ball is provided on the upper surface of the head,
A person using the putter can easily confirm the golf ball and the horizontal hit position of the putter head to be hit in the pre-operation stage before actually hitting the golf ball, and thereby the head position or The standing position of itself can be corrected, and the movement trajectory of the head can be easily corrected. Therefore, the golf ball can be hit at the optimum horizontal position of the putter at any time. Further, according to the golf putter of claim 5, in addition to the effect of the configuration of claim 4, the mark is a picture of a golf ball having the same size as the golf ball shown on the upper surface of the head. By aligning the golf ball and the picture of the golf ball drawn on the putter, the horizontal hit position of the golf ball and the putter head to be hit can be visually confirmed more easily. It is very easy to adjust the position of the putter or correct the trajectory of the putter to hit.

[Brief description of drawings]

FIG. 1 is a perspective view and FIG. 1B is a cross-sectional view showing a main part of a golf putter showing a first embodiment of the present invention.

FIG. 2 shows a main part of a golf putter showing a second embodiment of the present invention, in which (A) is a perspective view and (B) is a sectional view.

FIG. 3 is a perspective view and FIG. 3B is a cross-sectional view showing a main part of a golf putter showing a third embodiment of the present invention.

FIG. 4 shows a main part of a golf putter showing a fourth embodiment of the present invention, (A) is a perspective view and (B) is a sectional view.

FIG. 5 is a perspective view and FIG. 5B is a cross-sectional view showing a main part of a putter for golf showing a fifth embodiment of the present invention.

FIG. 6 shows a main part of a golf putter showing a sixth embodiment of the present invention, (A) is a perspective view and (B) is a sectional view.

FIG. 7 shows a main part of a golf putter showing a seventh embodiment of the present invention, (A) is a perspective view and (B) is a sectional view.

FIG. 8 is a perspective view showing a main part of a golf putter showing an eighth embodiment of the present invention, and FIG.

FIG. 9 is a perspective view showing a main part of a golf putter showing a ninth embodiment of the present invention, and FIG. 9 (B) is a plan view of a head.

FIG. 10 is a plan view of a head showing a main part of a golf putter according to a tenth embodiment of the present invention.

FIG. 11 is an overall view showing a conventional putter.

FIG. 12 is a diagram illustrating a position when a head of a conventional putter hits a golf ball.

[Explanation of symbols]

10 shaft 20 heads 21 face 22 bottom 23, 24, 25 cut surface 23a edge 26 Bulging part 27 Golf Ball Painting 27a tip point 27b, 27c end points B golf ball G ground P1 vertical hit position P2 Horizontal hit position Q The part from the bottom of the face to the bottom r radius of golf ball R head radius of curvature of face

Claims (5)

[Claims] 1. A golf putter having a head having a face surface for hitting a golf ball, wherein the most protruding portion of the face surface is located at a position where the height from the bottom of the head is the radius of the golf ball or more. By arranging so that the face surface always hits the golf ball at a position slightly higher than the radial height of the golf ball, and from the lower part of the face surface to the head bottom part, there is an angleless arc. A golf putter characterized by being retracted. 2. A vertical cross section of the face surface is formed continuously as a part of an arc having a radius of curvature of the golf ball or a radius of curvature larger than that, at least from the bottom of the head to a height position slightly exceeding the radius of the golf ball. The golf putter according to claim 1, wherein: 3. A bulging portion is formed at a position on the face surface where the height from the bottom of the head is equal to or greater than the radius of the golf ball, so that the bulging portion is always slightly above the radial height of the golf ball. The golf putter according to claim 1, wherein the golf putter is hit. 4. A golf putter characterized in that a mark indicating the horizontal hit position of the putter head which should hit the golf ball is provided on the upper surface of the head. 5. A golf putter characterized in that the mark is a picture of a golf ball having the same dimensions as the golf ball shown on the upper surface of the head.