KR20080048387A - Putter head - Google Patents

Abstract

A putter head having is provided to reduce back spin of a ball by reducing a contact area of the face surface and the ball. A putter head includes: a first group of grooves(4) formed to be parallel to each other; and a second group of grooves(5) formed to be different in depth from the first group of grooves. The putter head has at least two kinds of grooves among the first group of grooves and the second group of grooves.

Description

Putter head {PUTTER HEAD}

The present invention relates to a golf putter head, and more particularly to a putter head provided with a groove on the face surface.

The putter head is the head of the putter, a golf club for rolling balls on the green. As described in paragraph 0002 of Japanese Patent Application Laid-Open No. 2003-777, the entire face is referred to as a common milling mark, in the shape of an arc of equal intervals as viewed from the face face, by cutting into a price plate. The formation of the groove is well seen. The reason for forming this groove is that soft peeling is obtained by the reduction of the contact area with the golf ball, or the ball is hard to slip in the state where the face surface is wet by rain or dew, or the beauty of the design. There are many advantages, including meaning, and it is seen in many of the higher-quality putter club heads that put a lot of emphasis on feel and peeling.

In Claims 3 to 5 of the publication, it is described that the groove interval is 0.3 to 3 mm, the groove depth is 0.03 to 0.3 mm, and the radius of the arc of the arc-shaped groove is 8 to 80 mm.

The putter head generally has a loft angle of about 2 to 5 degrees, and it was found that the high speed camera photographed that the back spin was applied to the golf ball just before the impact. The cloud of the ball worsens by this back spin. An object of the present invention is to provide a putter head improved to reduce this back spin.

The putter head of the present invention (claim 1) is a putter head in which a plurality of grooves are formed in a face surface, the first group of grooves being parallel to each other, and the second group of grooves having different groove depths from those of the first group. At least two types of grooves are provided.

The putter head of claim 2 has a ratio (W / S) of the groove width [W (mm)] of the first group of grooves to the width [S (mm)] between the grooves of claim 1, wherein the ratio is 0.5 to 2.0. It is to be done.

The putter head of claim 3 is characterized in that the groove width W of the grooves of the first group is 0.5 to 1.6 mm in claim 2.

The putter head according to claim 4, wherein the depth H of the grooves of the first group is 0.03 to 1.2 mm, and the depth of the grooves of the second group is 0.01 to 0.3 mm. It is characterized by.

According to any one of claims 1 to 4, the putter head of claim 5 is characterized in that the cross-sectional shape of the grooves of the first group is rectangular or U-shaped.

The putter head of claim 6 is characterized in that the grooves of the first group and the grooves of the second group extend in different directions according to any one of claims 1 to 5.

The putter head of claim 7 is characterized in that the grooves of the second group are made of milling marks according to claim 6.

The putter head of claim 8 is characterized in that the grooves of the second group are all arc-shaped according to any one of claims 1 to 7.

The putter head of claim 9 is characterized in that the face is made of an insert material different in material from the main body according to any one of claims 1 to 8.

The putter head of claim 10 is characterized in that the insert member is made of a laminate in which a plurality of materials are laminated.

The putter head of claim 11 is characterized in that at least one layer of the laminate is made of metal, and the other at least one layer is made of synthetic resin, rubber, or elastomer.

As a result of the researches of the present inventors, it was found that reducing the back contact area decreases the back spin. In addition, when the golf ball hit the golf ball with a putter, a pressure-sensitive paper was applied to the face surface of the putter head, and when it was examined, it was confirmed that a trace of about 5 mm was left when hitting a long distance of about 2 to 3 mm in diameter. It turned out that there was some deformation to the ball.

Thus, the same groove as the corrugation formed in the iron head was placed on the face, and the initial back spin amount of the ball was examined, and the cloud amount was investigated. As a result, in the case of the iron head, since the head speed is much faster than the putter head, since the ball penetrates into the collation (groove), the amount of back spin is expected to increase, but in the case of the putter head, the amount of back spin is reversed. It was found to decrease.

This invention is based on this knowledge.

In this invention, since the groove | channel of the some group containing at least 1st group and 2nd group from which a mutual extension direction differs is provided, the contact area of a face surface and a ball will become small, and a back spin will be small.

In the present invention, grooves having different extension directions are provided, and since the number of grooves is large, processing takes time when the grooves are formed by cutting. Moreover, when manufacturing the putter head in which the groove | channel was formed by casting, when either groove of a 1st group and a 2nd group is deep, there exists a possibility that the hot water flow of the part between grooves may worsen, and a defective rate may become high.

Therefore, in the present invention, it is easy to manufacture the putter head by making the depths of the grooves of the first group and the grooves of the second group different.

In the putter head of the present invention, since the amount of back spin of the putted ball is small, the ball rolling on the green is overspined at an early stage deviating from the face surface, so that the ball rolls smoothly on the line aimed at. In addition, especially when the turf on the green is reversed, it is prevented that the flying speed or distance is unexpectedly shortened and the shot is greatly shortened (a long distance from the ball to the cup is left). In the present invention, the feel can be adjusted by configuring the face surface with an insert material different from the main body.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

1 is a front view of the putter head according to the embodiment, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is an enlarged view of the face surface portion of FIG.

The putter head 1 is a putter by inserting a shaft (not shown) into the hosel portion 2 and fixing it with an adhesive or the like.

In the face surface 3 of this putter head 1, the some groove 4 extended in the toe-hill direction as a groove | channel of a 1st group is provided in parallel. Moreover, the face surface 3 is provided with the 2nd group groove 5 which consists of a roughly circular milling mark.

The groove 4 extends in the horizontal direction in a soul state in which the center portion of the sole surface of the putter head 1 is in contact with the horizontal surface in the toe-heel direction. The center of the longitudinal direction of each groove 4 is located near the center of the toe-heel direction of the putter head 1.

The length of the groove 4 is preferably 5 mm or more, in particular 30 mm or more. The groove 4 may exist over the entire length of the face surface 3 in the toe-heel direction. The number of the grooves 4 is preferably three or more, particularly about 3 to 30.

The distance from the lower edge of the lowest groove 4 and the sole surface of the putter head 1 is preferably 10 mm or less. If there is a groove at a position higher than the contact point of the ball at the time of putting, the effect of reducing the back spin cannot be obtained.

Next, the width, groove spacing, depth, and cross-sectional shape of the grooves 4 of the first group will be described.

In the present invention, the ratio (W / S) of the groove width W and the groove spacing S of the first group of grooves 4 is preferably 0.5 to 2, more preferably 0.5 to 1.5, Especially preferably, it is 0.6-1.3. If W / S is smaller than 0.5, groove formation becomes difficult. If it is larger than 2, the ball may come into contact only with a part without a groove, or may come in contact with a part with a groove, whereby a deviation is likely to occur in the cloud distance.

The groove width W of the first group of grooves 4 is preferably 0.5 to 1.6 mm, in particular 0.5 to 1.25 mm, in particular 0.75 to 1.25 mm. If the groove width is less than 0.5 mm, groove formation becomes difficult, so it is set to 0.5 mm or more. The reason for setting it to 1.6 mm or less is because the scar of the ball was about 2-5 mm in diameter. If the groove width is larger than 1.6 mm, there is a possibility that the edge portion of the groove portion tends to be uneven in the rolling distance of the ball.

The groove spacing S of the first group of grooves 4 is preferably 0.25 to 3.2 mm, particularly about 0.25 to 2.5 mm. If the groove space | interval S is smaller than 0.5 mm, groove formation will become difficult.

The groove 4 is for reducing the contact area between the face 3 and the ball. Therefore, there is no influence in the depth where the groove 4 is deep, but it is preferably 1.2 mm or less. When the diameter of the scar is about 2 to 3 mm, since the ball deforms about 0.03 mm, it is preferable to have a depth of 0.03 mm or more.

The cross-sectional shape of the first group of grooves 4 may be any one of a V groove, a U groove, and a square groove, but the U groove and the square groove are preferable because the contact area of the face surface hardly changes even when the ball deforms. . In addition, it is preferable to round the corners where the face surface and the groove contact each other because the influence of the back spin is reduced.

The depth of the groove of the second group of grooves 5 is preferably smaller than that of the first group of grooves 4, and is preferably 0.01 to 0.3 mm, particularly 0.03 to 0.1 mm. The groove 5 of the second group may be a milling mark. 4 shows definitions of the depth and the spacing of the grooves 5 formed of milling marks. The groove 5 may be a U-shaped or semi-circular cross-sectional shape shown in FIG. 5, or may be a square groove.

The groove | channel 5 is provided so that all the circular arcs of the same radius may be formed continuously, and the center of a circle will be located in a straight line. It is preferable that the center of this circular arc is located in the center part of the toe-heel direction of the face surface 2. As shown in FIG. The groove 5 is provided in an area in which at least the first group of grooves 4 exist.

In the present embodiment, the first group of grooves are created in the horizontal direction, but the first group of grooves may be formed in the vertical direction. In this case, the width, spacing and W / S of the grooves are as described above. In the case of the longitudinal groove, the length is preferably 5 mm or more. In the case of the longitudinal grooves, it is preferable to be provided in at least the central region of the face surface in the toe-heel direction. It is preferable that the length of the toe-heel direction of this center part area | region is 5 mm or more.

The material of the putter head of the present invention is any metal, synthetic resin, rubber, ceramics, carbon, or the like. Moreover, you may comprise only a face surface from material different from the main-body part of a putter head.

In the said embodiment, although the groove | channel 4 is linear shape, it may be curved shape, such as circular arc shape. Moreover, you may provide both a horizontal groove and a vertical groove.

Although the said groove | channel 5 of the 2nd group consists of milling marks in the said Example, you may provide the groove | channel which consists of a V groove, a U groove, a square groove, etc. by a cutting process and casting.

With reference to FIGS. 6-9, embodiment which comprised the face surface by the insert material is described. Fig. 6 is a front view of the putter head 1A, Fig. 7 is a sectional view taken along the line VII-VII of Fig. 6, Fig. 8 is a perspective view of the back side of the insert material, Fig. 9 is a sectional view taken along the line IX-IX of Fig. 8. In addition, this putter head 1A is the same as the said putter head 1 except having provided the insert materials 10 and 20 in the face surface, and the same code | symbol has shown the same part.

The 1st insert material 10 is a substantially rectangular plate shape in which the back surface was cut out and becomes the recessed part 11, The groove 4 is provided in the front surface of this insert material 10. As shown in FIG.

From the back surface corresponded to the bottom surface of the recessed part 11 of the insert material 10, the convex part 12 of several (12 in this embodiment) columnar shape, Preferably cylindrical shape is protrudingly provided. This convex part 12 has the height whose front end surface becomes the same height as the back surface of the circumferential wall part 13 which surrounds the recessed part 11.

In addition, the thickness T of the entire insert material 10 is 2 to 6 mm, the depth of the concave portion 11, that is, the height of the convex portion 12 is 1 to 3 mm, and the number of the convex portions 12 is 10. The diameter of the convex portion 12 to 30 pieces is preferably 1 to 3 mm, and the thickness N of the peripheral wall portion 13 is preferably about 1 to 3 mm. The length of the insert material 10 in the toe-heel direction is preferably about 40 to 100 mm, and the height is preferably about 10 to 30 mm.

In the present embodiment, the recess 11 is filled with a second insert material 20 made of synthetic resin, rubber or elastomer. The insert material 10 in which the second insert material 20 is filled in the recess 11 is fitted to the recess of the head body through adhesive. In addition, with the adhesive or instead of the adhesive, the inside of the recess may be wider and the entrance may be narrower to make it difficult to fall off. In addition, as long as metals and ceramics are used, fixing methods such as caulking, welding, and soldering may be adopted.

Thus, by providing the insert materials 10 and 20 in a face surface, the sensory elements, such as a rudder, peeling, and a touch of the putter head 1A, can be adjusted.

As the first insert material 10, metals such as titanium, titanium alloys, stainless steel, soft iron, aluminum, aluminum alloys and precious metals are suitable, but may be rubber, synthetic resin, or the like, or ceramics, carbon or the like.

Examples of the synthetic resin constituting the second insert material 20 include polyurethanes, nylons, polyesters, polycarbonates, and the like, such as silicone rubbers, chloroprene rubbers, nitrile rubbers, natural rubbers, styrene butadiene rubbers, and the like. Urethane elastomers, ethylene elastomers, polyester elastomers, olefin elastomers, amide elastomers and the like are suitable. The Shore A hardness of the synthetic resin is preferably about 90 to 98, and the Shore A hardness of the rubber and elastomer is preferably about 20 to 30.

In the present invention, the second insert material 20 may be omitted, and only the first insert material 10 may be provided.

<Example>

Hereinafter, an Example and a comparative example are demonstrated.

1st-4th Comparative Example

As a putter head, the evaluation was performed using the pin-shaped putter head (material stainless SUS304) of 4 degree of loft angle.

In the first comparative example, neither of the grooves 4 and 5 was provided at all.

In the second to fourth comparative examples, only the groove 4 is provided, and the groove 5 is not provided.

Specifically, six face grooves 4 of the linear first group are inserted into the face surface as shown in the portion where the ball is hit (the middle portion of the face toe-heel direction). The groove was processed by machining to form a square groove. The length of the groove 4 was the longest in the lowest position, 54 mm, and the groove length in the highest position was the shortest, 37 mm.

The groove width of the groove 4 was 0.75 mm and the groove depth was 0.4 mm. The groove spacing is shown in Table 1.

A steel shaft was attached to each putter head to form a putter of 34 inches in club length. A top amateur (advanced golfer) hit a distance of 2.5 m with the putter of the first comparative example and putt it with the putters of the second to fourth comparative examples at the same head speed as the swing to roll the ball over the actual green. Photographing was performed with a high speed camera and the spin amount of the ball was measured. In addition, the ball slightly flew immediately after the hit, and then landed and rolled. Table 1 shows the experimental results. The unit rpm in a table | surface represents the rotation speed for 1 minute.

Table 1

As shown in Table 1, the putter head with the groove 4 had less initial back spin, more forward spin after landing, better cloud, and longer cloud distance.

5th to 7th Comparative Examples

Next, W / S was made constant at 0.9, except having changed the groove width, it tested about the same thing as the 2nd-6th comparative example, and examined the effect of groove width.

Specifically, as a putter head, W = 0.75 mm, S = 0.83 mm, W / S = 0.9, H = 0.4 mm (Comparative Example 5), W = 1.25 mm, S = 1.39 mm, W / S = 0.9 and H = 0.4 mm (Comparative Example 6) was used.

The same experiment was conducted with the same swing as when the distance of 4.8 m was hit with the putter of the first comparative example.

For the sake of contrast, the same putter head as in the first comparative example was tested under the same conditions (7th comparative example). The results are shown in Table 2.

First embodiment

In the fifth comparative example, a groove 5 having a narrower groove width and a shallower groove depth than the groove 4 was provided. The groove 5 was a U groove having a depth of 0.075 mm and a groove width of 0.39 mm. An arc-shaped groove of the same radius is provided, the center of the circle is moved by 1.2 mm in the vertical direction, and a plurality of grooves are provided. Table 2 shows the results of the experiment under the same conditions as the fifth to seventh comparative examples.

[Table 2]

As shown in Table 2, the fifth and sixth comparative examples showed a decrease in back spin compared to the seventh comparative example, and the cloud distance was extended.

The first embodiment has less backspin and a cloud distance than the fifth comparative example.

Second embodiment

The putter head 1A shown in FIGS. 6-9 was produced using the 1st insert material 10 and the 2nd insert material 20, and was provided to the test hit of a golfer, and the hitting feeling was aggregated. In addition, in No. 1 and 2, the 2nd insert material was abbreviate | omitted and only the 1st insert material 10 was used.

The dimension of each part of the 1st insert material 10 is as follows.

Toe and heel length: 60 mm

Height: 14 mm

Thickness (T): 4 mm

Perimeter wall thickness (N): 1.5 mm

Depth of the recess 11: 2 mm

The combination of the materials of the insert material is as follows. In Nos. 3 to 8, the left side of the symbol of + is the material of the first insert material, and the right side is the material of the second insert material.

No. 1: Only the first insert material 10 made of stainless steel

No.2: Only the first insert material 10 made of aluminum alloy

No.3: Stainless steel + high hardness resin

No.4: Aluminum Alloy + High Hardness Resin

No.5: stainless steel + rubber

No.6: Aluminum Alloy + Rubber

No.7: high hardness resin + rubber

No.8: High Hardness Resin + High Hardness Resin

SUS304 was used as stainless. 6061 was used as an aluminum alloy. As high hardness resin, the urethane resin of Shore A hardness 95 was used. Nitrile rubber of Shore A hardness 25 was used as rubber.

As a result of arranging the softness evaluation rank of the hitting from the soft side, it was confirmed that the hitting was adjusted. Moreover, when the favorable feeling was examined by 18 golfers, No. 8 was the highest, and in order of No. 5, No. 6, No. 1, 2 (same rank), No. 3, and No. 7 were the following.

1 is a front view of a putter head according to the embodiment.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1; FIG.

3 is an enlarged view of a portion of FIG. 2;

4 is a cross-sectional view near the surface of a face surface illustrating a milling mark.

5 is an explanatory diagram of a cross-sectional shape of the groove 5 in the embodiment.

6 is a front view of a putter head according to another embodiment.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6; FIG.

8 is a perspective view of a first insert material;

Fig. 9 is a sectional view taken along the line IX-IX in Fig. 8;

<Description of the code for the main part of the invention>

1: putter head

2: hosel

3: face face

4: Home of the first group

5: Home of the 2nd Army

Claims (11)

In the putter head formed with a plurality of grooves in the face surface, And a first group of grooves parallel to each other, and at least two kinds of grooves of the second group of grooves having different groove depths from those of the first group. The putter head according to claim 1, wherein the ratio (W / S) of the groove width [W (mm)] of the grooves of the first group to the width [S (mm)] between the grooves is 0.5 to 2.0. . 3. The putter head according to claim 2, wherein the groove width (W) of the grooves of the first group is 0.5 to 1.6 mm. The putter according to any one of claims 1 to 3, wherein the depth H of the grooves of the first group is 0.03 to 1.2 mm, and the depth of the grooves of the second group is 0.01 to 0.3 mm. head. The putter head according to any one of claims 1 to 4, wherein the cross-sectional shape of the grooves of the first group is rectangular or U-shaped. The putter head according to any one of claims 1 to 5, wherein the grooves of the first group and the grooves of the second group extend in different directions. 8. The putter head according to claim 6, wherein the second group of grooves are milled marks. 8. The putter head according to any one of claims 1 to 7, wherein all of the grooves of the second group are substantially arcuate. The putter head according to any one of claims 1 to 8, wherein the face face is made of an insert material different from the main body. The putter head according to claim 9, wherein the insert member is made of a laminate in which a plurality of materials are laminated. 11. A putter head according to claim 10, wherein at least one layer of the laminate is made of metal, and the other at least one layer is made of synthetic resin, rubber or elastomer.

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