CN101190377A - putter head - Google Patents

Abstract

The present invention provides a putter head with less backspin. On the club face (3) of the putter head (1), a plurality of grooves (4) extending in the direction of the toe end and the heel end are arranged in parallel. The width W of the groove (4) is 0.5-1.6 mm, the groove interval S is 0.25-3.2 mm, and the W/S is 0.5-2.0, preferably 0.5-1.5. The depth H of the groove is 0.03 to 1.2 mm. The cross-sectional shape of the groove (4) is square or U-shaped. The slot (4) can also be a longitudinal slot, or both the transverse slot and the longitudinal slot can be provided.

Description

putter head

technical field

The invention relates to a putter head for playing golf, in particular to a putter head with grooves on the club surface.

Background technique

A putter head is a club head of a putter used in golf clubs to roll a ball on a green. As described in paragraph 0002 of Japanese Patent Application Laid-Open No. 2003-777, the club head in the prior art is: through the cutting process of a milling machine, a groove commonly called a milling groove is formed on the entire club face. It looks like a circular arc with equal intervals. Such club heads are common. The reason why the grooves are formed is to reduce the contact area between the club face and the golf ball to obtain a soft hitting feeling or prevent the ball from slipping when the club face is wet by rain or dew. In addition, this kind of milling groove has various advantages such as the appearance advantage brought by the design style, and it is often seen in putter heads used by advanced golfers who place importance on hitting feel and ball feel.

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

Contents of the invention

The putter head generally has a loft angle of 2 to 5 degrees, and it is found that the ball produces backspin before the face of the putter head hits and deforms the golf ball by taking pictures with a high-speed camera. This amount of backspin can cause the ball to roll poorly. An object of the present invention is to provide an improved putter head for reducing the amount of backspin.

In the putter head of the present invention (claim 1), a plurality of grooves are formed substantially in parallel on the face of the putter head, and the ratio W/S of the groove width W (mm) to the groove interval S (mm) is 0.5 to 2.0.

On the basis of the technical solution 1, the groove width W of the push rod head of the technical solution 2 is 0.5-1.6 mm.

On the basis of technical solution 1 or 2, on the putter head of technical solution 3, the depth H of the groove is 0.03-1.2 mm.

On the basis of any one of technical solutions 1 to 3, as far as the putter head of technical solution 4 is concerned, the cross-sectional shape of the groove is square or U-shaped.

In any one of claims 1 to 4, in claim 5, the face of the putter head is composed of an insert member made of a material different from that of the main body.

On the basis of the technical solution 5, on the push rod head of the technical solution 6, the insert member is composed of a laminated material formed by laminating multiple materials.

In addition to claim 6, in the putter head of claim 7, at least one layer of the laminate is made of metal, and at least the other layer is made of synthetic resin, rubber or elastic body.

From the research results of the present inventors, it is known that the amount of backspin can be reduced by reducing the contact area between the club face and the ball. In addition, by sticking pressure-sensitive paper on the face of the putter head to study the marks on the face of the putter when playing golf with a putter, it can be seen that there are traces with a diameter of 3 to 5 mm left on the pressure-sensitive paper, and it can be known that the ball is slightly damaged. There is deformation.

Therefore, the same grooves as the corrugations on the iron head were installed on the club face to study the initial spin and roll of the ball. It was found that when the club head is an iron club head, because the club head speed is much faster than that of the putter head, the ball bites into the corrugations (grooves), resulting in an increase in the amount of spin, but when the club head is In the case of the putter head, the amount of backspin is actually reduced.

The present invention is a putter head invented based on the above knowledge.

With regard to the putter head of the present invention, as described above, since the amount of backspin of the ball being putt is small, the ball rolling on the lawn is topspinned at an early stage of leaving the face and smoothly along the aimed line. rolling. Also, prevents the ball's roll distance from being unexpectedly drastically reduced (longer distance left from the stopped ball to the hole), especially if the grass on the lawn grows inversely to the ball's roll Case. In the present invention, the impact feeling can be adjusted by constituting the club face with an insert member made of a material different from that of the main body.

Description of drawings

Fig. 1 is a front view of a putter head in an embodiment.

Fig. 2 is a sectional view along line II-II of Fig. 1 .

FIG. 3 is an enlarged view of a part of FIG. 2 .

Fig. 4 is a front view of a putter head in another embodiment.

Fig. 5 is a sectional view taken along line V-V of Fig. 4 .

Fig. 6 is a perspective view of a first insert member.

Fig. 7 is a sectional view taken along line VII-VII of Fig. 6 .

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a front view of the putter head in the embodiment. Fig. 2 is a sectional view along line II-II of Fig. 1 . FIG. 3 is an enlarged view of the face portion of FIG. 2 .

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

A plurality of grooves 4 extending in the toe-heel direction are provided in parallel on the face 3 of the putter head 1 .

The groove 4 extends in the horizontal direction in a grounded state where the center portion in the toe-heel direction of the bottom surface of the putter head 1 is in contact with a horizontal plane. The center of each groove 4 in the longitudinal direction is located near the center of the putter head 1 in the toe and heel directions.

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

The distance between the lower edge of the lowest groove 4 and the bottom surface of the putter head 1 is preferably 10 mm or less. In addition, when the groove 4 is in the shape of a circular arc protruding downward, the lowest groove 4 can also extend along the lower edge of the club face 3 .

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

In the present invention, the ratio W/S of the groove width W to the groove interval S is 0.5 to 2, preferably 0.5 to 1.5, particularly preferably 0.6 to 1.3. If W/S is less than 0.5, the effect is small. In addition, if W/S is larger than 2, the ball may only come into contact with the portion without the groove, and sometimes it may not contact the portion without the groove, so that the rolling distance tends to vary.

The groove width W is preferably 0.5 to 1.6 mm, particularly preferably 0.5 to 1.25 mm, and especially preferably 0.75 to 1.25 mm. If the groove width W is less than 0.5 mm, it will be difficult to form the groove, so the groove width is 0.5 mm or more. The reason why the groove width W is set to be 1.6 mm or less is because the diameter of the ball scar is 3 to 5 mm. If the groove width W is larger than 1.6 mm, there is a possibility that the balls may easily deviate in the rolling distance at the edge of the groove.

The groove interval S is 0.25 to 3.2 mm, particularly preferably 0.25 to 2.5 mm. If the groove interval S is less than 0.25 mm, it will be difficult to form grooves.

The groove 4 is used to reduce the contact area between the club face 3 and the ball. Therefore, when the groove 4 is deep, there is no influence on the effect, and it is preferably 1.2 mm or less. In the case where the diameter of the scar is approximately 3 mm, the ball deforms by 0.03 mm, so the groove 4 preferably has a depth of 0.03 mm or more.

The cross-sectional shape of the groove can be any of V-shaped groove, U-shaped groove, and square groove. However, for U-shaped grooves and square grooves, even if the ball deforms, the contact area with the club face is almost unchanged, so U-shaped grooves and square grooves are preferred. In addition, if the corner where the face and the groove meet is rounded, the influence of the amount of backspin can be reduced, so it is preferable that the corner where the face and the groove meet is rounded.

In this embodiment, the grooves are formed in the transverse direction, but the grooves may also be formed in the longitudinal direction. In this case, the width, interval, and W/S of the grooves are as described above. When the groove is a vertical groove, the length of the groove is preferably 5 mm or more.

The material of the push rod head of the present invention can be any one of metal, synthetic resin, rubber, pottery and fiber-reinforced resin. In addition, only the club face can be formed with a material different from that of the main body part of the putter head.

In the above-described embodiment, the groove 4 is linear, but it may be curved such as a circular arc. Furthermore, both transverse and longitudinal grooves may also be provided.

An embodiment in which a club face is formed using an insert member will be described with reference to FIGS. 4 to 7 . FIG. 4 is a front view of the putter head 1A. Fig. 5 is a sectional view taken along line V-V of Fig. 4 . Fig. 6 is a perspective view of the inner surface side of the insert member. Fig. 7 is a sectional view taken along line VII-VII of Fig. 6 . In addition, this putter head 1A is the same as the above-mentioned putter head 1 except that the insert members 10 and 20 are provided on the face, and the same reference numerals denote the same parts.

The first insert member 10 is substantially in the shape of a rectangular plate, and a part of its inner surface is cut away to form a recess 11 , and the front surface of the insert member 10 is provided with a groove 4 .

A plurality of (twelve in this embodiment) columnar, preferably columnar, projections 12 protrude from the inner surface of the insert member 10 corresponding to the bottom surface of the recess 11 . The convex portion 12 has a height whose top end surface is flush with the rear surface of the peripheral wall portion 13 surrounding the recess 11 .

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

In this embodiment, the recess 11 is filled with the second insert member 20 made of synthetic resin, rubber or elastic body. The insert member 10 filled with the second insert member 20 in the recess 11 is fitted and bonded to the recess of the head main body with an adhesive. In addition, it is also possible to expand the inside of the recess and narrow the entrance while using the adhesive, or instead of the adhesive, so that the fitting cannot be easily released. In addition, if both the second insert member 20 and the first insert member 10 are made of metal or ceramics, fixing methods such as riveting, welding, and brazing may be used.

In this way, by providing the insert members 10, 20 on the club face, it is possible to adjust the sensory factors such as impact feeling, ball feeling, and touch feeling of the putter head 1A.

The first insert member 10 is preferably metal such as titanium, titanium alloy, stainless steel, soft iron, aluminum, aluminum alloy, or noble metal, but may be rubber, synthetic resin, or ceramics, carbon, or the like.

The synthetic resin constituting the second insert member 20 is preferably polyurethane, nylon, polyester, polyacetate, etc.; the rubber is preferably silicone rubber, neoprene rubber, nitrile rubber, natural rubber, styrene, etc. - Butadiene rubber and the like; as the elastomer, styrene-based elastomers, urethane-based elastomers, vinyl-based elastomers, polyester-based elastomers, vinyl-based elastomers, amide-based elastomers, and the like are preferable. The Shore A hardness of the synthetic resin is preferably 90-98, and the Shore A hardness of the rubber and the elastomer is preferably 20-30.

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

Example

Next, Examples and Comparative Examples will be described.

Embodiment 1～3, comparative example 1

As the putter head, a flagstick-type putter head (made of stainless steel SUS304) with a loft angle of 4 degrees was used for evaluation.

On the club face, as shown in the figure, five grooves are provided in the hitting part (the middle part of the club face in the direction of the toe end and the heel end). The groove is a square groove formed by machining. In terms of the length of the groove, the groove length at the lowest position is the longest at 54mm, and the groove length at the highest position is the shortest at 37mm.

The groove width is 0.75mm, and the groove depth is 0.4mm.

A steel shaft is attached to this putter head and used as a putter.

Tried by top amateurs (advanced golfers). Aim for 2.5m and experiment with the same swing. The amount of backspin of the ball is measured by taking pictures of the ball rolling on the lawn with a high-speed camera. Additionally, the ball travels some distance after impact and then hits the ground and rolls. The test results are shown in Table 1. The unit rpm in the table is revolutions per minute.

[Table 1]

As shown in Table 1, for the putter head with grooves, the initial amount of backspin is less, the amount of forward rotation after landing is more, the rolling is better, and the rolling distance is extended.

Embodiment 4,5, comparative example 2

Next, the W/S was set to a constant value of 0.9, and an experiment was conducted using a putter head whose groove width was changed to examine the effect of the groove width.

As the putter head, adopt the putter head (embodiment 4) of W=0.75mm, S=0.83mm, W/S=0.9, H=0.4mm and W=1.25mm, S=1.39mm, W/S= 0.9, H=0.4mm putter head (embodiment 5).

This time, I aimed at 4.8m and tested with the same swing.

For comparison, the same putter head as Comparative Example 1 was also tested under the same conditions (Comparative Example 2). The results are shown in Table 2.

[Table 2]

As shown in Table 2, comparing any one of Examples 4 and 5 with Comparative Example 2, it can be seen that the amount of gyration is reduced and the rolling distance is extended.

Example 6

Using the first insert member 10 and the second insert member 20 , the putter head 1A shown in FIGS. 4 to 7 is produced for a golfer to try out and summarize the impact feeling. In addition, in numbers 1 and 2, the second insert member 20 is omitted, and only the first insert member 10 is used.

The dimensions of each part of the first insert member 10 are as follows:

Length in the toe and heel direction: 60mm

Height : 14mm

Thickness T : 4mm

Peripheral wall thickness N : 1.5mm

Depth of recess 11: 2mm

The material combinations of the insert components are as follows: in numbers 3 to 8, the left side of the symbol "+" is the material of the first insert component, and the right side is the material of the second insert component.

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

Number 2: Only the first insert member 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

The stainless steel is made of SUS304, and the aluminum alloy is made of 6061. As the high-hardness resin, a urethane resin having a Shore A hardness of 95 was used. As the rubber, nitrile rubber having a Shore A hardness of 25 was used.

From the results of ranking the evaluation order of the softness of the hitting feeling from soft to hard, it can be considered that the hitting feeling can be adjusted. Among them, a survey of 18 golfers' favorability of hitting feeling shows that No. 8 is the highest, followed by No. 5, No. 6, No. 1, No. 2 (tied), No. 3, and No. 7.

Claims (7)

1. push rod cup, almost parallel ground is formed with many grooves on its pole face, it is characterized in that,

Groove width W (mm) and the ratio W/S of groove interval S (mm) are 0.5～2.0.

2. push rod cup as claimed in claim 1 is characterized in that,

Described groove width W is 0.5～1.6mm.

3. push rod cup as claimed in claim 1 or 2 is characterized in that,

The depth H of described groove is 0.03～1.2mm.

4. as any described push rod cup in the claim 1～3, it is characterized in that,

The section shape of described groove is square or the U font.

5. as any described push rod cup in the claim 1～4, it is characterized in that,

Described pole face is made of the member of inserting different with main material.

6. push rod cup as claimed in claim 5 is characterized in that,

This member of inserting is to press the lamination material that forms to constitute by various material layers.

7. push rod cup as claimed in claim 6 is characterized in that,

One deck at least of this lamination material is made of metal, and other one deck at least is made of synthetic resin, rubber or elastomer.

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