JP2010136736A - Head for golf putter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf putter which makes soft contact compatible with controllability in hitting balls. <P>SOLUTION: The head 4 for the golf putter has a head body h1 made of a metal and a face member f1 made of an elastic material. The front Ff of the face member f1 makes at least a part of the face surface 10. The face member f1 has a body part fh and a rear protruded part fp provided on the rear side of the body part fh. The head body h1 has the main recessed part r1 housing the body part fh and a sub recessed part r2 which is provided inside the main recessed part r1 and houses the rear protruded part fp. The side s1 of the body part fh is bonded on or abutted onto the side s3 of the main recessed part r1. The rear b1 of the body part fh is bonded on or abutted onto the bottom b3 of the main recessed part r1. The side s2 of the rear protruded part fp is bonded to or abutted on the side s4 of the sub recessed part r2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a golf putter head.

  As a golf putter head, a head in which a face insert is disposed on a metal head main body is known.

The face insert is made of an elastic material. With this head, a soft feel at impact can be obtained. Japanese Patent Application Laid-Open Nos. 8-196668, 2005-124730, and 2004-236985 disclose putter heads having face inserts made of an elastic material.
JP-A-8-196668 JP 2005-124730 A JP 2004-236985 A

  A softer feel at impact can be achieved by the soft face insert. However, soft face inserts are prone to deformation. Due to this deformation, the direction of the hit ball tends to vary. Further, due to this deformation, the resilience of the ball tends to become unstable. In this case, it becomes difficult to control the rolling distance.

  An object of the present invention is to provide a golf putter head that can achieve both controllability of the ball and a soft feel at impact.

  A golf putter head according to the present invention includes a head body made of metal and a face member made of an elastic material. The face member has a main body portion and a rear convex portion provided on the rear side of the main body portion. The entire face member is integrally formed. The front surface of the main body is at least a part of the face surface. The head main body includes a main concave portion that accommodates the main body portion, and a sub concave portion that is provided inside the main concave portion and accommodates the rear convex portion. The side surface of the main body is adhered or abutted on the side surface of the main recess. The rear surface of the main body is bonded or in contact with the bottom surface of the main recess. The side surface of the rear convex portion is adhered or abutted on the side surface of the sub concave portion.

Preferably, when the occupation area of the rear convex portion is S1 (mm ² ) and the total area of the back side of the main body portion is S2 (mm ² ), the ratio (S1 / S2) is 0.1 or more and 0. .7 or less.

  Preferably, the number of the rear protrusions is two or more.

  Preferably, when the thickness of the main body portion is t1 (mm) and the thickness of the rear convex portion is t2 (mm), the ratio (t1 / t2) is 0.5 or more and 5 or less.

  Preferably, when the Shore D hardness of the face member is h and the thickness of the main body is t1 (mm), the ratio (h / t1) is 15 or more and 50 or less.

  Unnecessary deformation of the face member can be suppressed by the engagement between the rear convex portion of the face member and the head body. This putter head can achieve both controllability and a soft feel at impact.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is an overall view of a golf putter 2 according to an embodiment of the present invention. The golf putter 2 has a head 4, a grip 6 and a shaft 8. The head 4 is attached to one end of the shaft 8. The grip 6 is attached to the other end portion of the shaft 8.

  The vicinity of the tip of the shaft 8 is bent. By this bending, the lie angle and the real loft angle of the golf putter 2 are appropriately adjusted.

  FIG. 2 is a view of the head 4 as viewed from above (top side). FIG. 3 is a view of the head 4 as viewed from the front (face surface side). 4 is a cross-sectional view taken along line IV-IV in FIG. 2, and FIG. 5 is a cross-sectional view taken along line V-V in FIG. FIG. 6 is an enlarged cross-sectional view of the vicinity of the face portion in FIG. FIG. 7 is a view of the head main body h1 as viewed from the front. In other words, FIG. 7 is a view showing a state where the face member f1 is removed from FIG. 8 is a partial cross-sectional view taken along line F8-F8 in FIG. In other words, FIG. 8 is a view in which the face member f1 and the paint 25 are removed from FIG. FIG. 9 is a view of the face member f1 as seen from the rear. FIG. 10 is a cross-sectional view taken along line F10-F10 in FIG.

  The head 4 has a face surface 10, a sole surface 12 and an upper surface 14. The face surface 10 is the front surface of the head 4. The face surface 10 is a flat surface. In impact, the face surface 10 and the golf ball come into contact with each other. The face surface 10 is a smoothly continuous surface. The face surface 10 may be a curved surface. Fine irregularities and grooves may be formed on the face surface 10. As this fine unevenness | corrugation, the milling trace formed by being milled is illustrated.

  The head 4 includes a head body h1 and a face member f1. The head body h1 is made of metal. The face member f1 is made of an elastic material.

  As shown in FIG. 2, a shaft hole 16 is provided in the head main body h1. The tip end of the shaft 8 is inserted and bonded to the shaft hole 16.

  The face member f1 has a main body part fh and a convex part fp. The convex portion fp is provided on the rear side of the face member f1. This convex part fp is called a rear side convex part in this application.

  The front surface Ff of the main body part fh is a plane. The front surface Ff of the main body part fh is also the front surface of the face member f1. A front surface Ff of the main body portion fh constitutes a part of the face surface 10. A front surface Ff of the main body portion fh constitutes a central portion of the face surface 10. The front surface of the head body h1 constitutes the peripheral portion of the face surface 10. The front surface of the head main body h1 and the front surface Ff form substantially the same plane. This same plane is the face surface 10.

  The main body portion fh has a flat plate shape. The thickness t1 of the main body part fh is constant.

  The rear convex part fp has a flat plate shape. The thickness t2 of the rear convex part fp is constant. The rear convex part fp protrudes toward the rear of the head.

  The entire face member f1 is integrally formed. The main body portion fh and the rear convex portion fp are integral. Therefore, the effect of suppressing deformation due to the presence of the rear convex portion fp is enhanced. This deformation suppressing effect will be described later.

  As shown in FIGS. 2 and 7, in the present embodiment, a plurality of rear convex portions fp are provided. In the present embodiment, there are two rear convex portions fp. The rear convex part fp may be one.

  The main body portion fh of the face member f1 has a rear surface b1 and a side surface s1 (see FIGS. 2, 6, and 10).

  The rear protrusion fp of the face member f1 has a rear surface b2 and a side surface s2 (see FIGS. 2, 6, and 10).

  As shown in FIG. 8, the head body h1 has a main recess r1 and a sub-recess r2. The sub-recess r2 is provided inside the main recess r1. The main recess r1 accommodates the main body part fh. The sub-recess r2 accommodates the rear protrusion fp.

  The main recess r1 has a bottom surface b3 and a side surface s3 (see FIG. 8). The contour shape of the main recess r1 corresponds to the contour shape of the main body portion fh.

  The sub-recess r2 has a bottom surface b4 and a side surface s4 (see FIG. 8). The contour shape of the sub-concave portion r2 corresponds to the contour shape of the rear convex portion fp. The number of rear protrusions fp, the number, and the number of sub-recesses r2 are the same. In the present embodiment, two sub-recesses r2 are provided.

  A paint 25 is provided between the side surface s1 and the side surface s3 (see FIGS. 6 and 3). This paint 25 uses, for example, an acrylic resin as a base material. The paint 25 is arranged over the entire periphery of the face member f1. The paint 25 fills the gap between the face member f1 and the head main body h1. The paint 25 bonds the side surface s1 and the side surface s3. The paint 25 contributes to ensuring that the face member f1 is fixed to the head body h1. Moreover, the outline of the face member f1 can be clearly visually recognized by the paint 25 (see FIG. 3). In FIG. 3, the paint 25 is indicated by a thick line. The paint 25 is colored. This coloring improves the aesthetics of the head 4.

  The rear surface b1 of the main body part fh is bonded to the bottom surface b3 of the main recess r1 (see FIG. 6). This adhesion is performed by, for example, a double-sided tape. This adhesion may be made with an adhesive. In the sectional views of FIG. 6 and the like, the description of the section of the double-sided tape is omitted.

  The side surface s2 of the rear protrusion fp is in contact with the side surface s4 of the sub-recess r2. This abutment is direct. This abutment may be an indirect abutment via another member. The side surface s2 and the side surface s4 may be bonded.

  The rear surface b2 of the rear protrusion fp is in contact with the bottom surface b4 of the sub-recess r2. This abutment is direct. This abutment may be an indirect abutment via another member. The rear surface b2 and the bottom surface b4 may be bonded. The rear surface b2 and the bottom surface b4 may be separated from each other. A gap (space) may exist between the rear surface b2 and the bottom surface b4.

  In the present invention, the side surface s1 of the main body portion fh is adhered or abutted on the side surface s3 of the main recess r1. This abutment may be an indirect abutment via another member.

  In the present invention, the rear surface b1 of the main body portion fh is bonded or abutted on the bottom surface b3 of the main recess r1. This abutment may be an indirect abutment via another member.

  In the present invention, the side surface s2 of the rear projection fp is adhered or abutted on the side surface s4 of the sub-recess r2. Due to this contact or adhesion, excessive deformation of the face member f1 can be suppressed. In particular, deformation and expansion / contraction of the face member f1 in the in-plane direction of the face surface 10 is effectively suppressed. Due to this contact or adhesion, variations in the hitting direction can be suppressed. This contact or adhesion can improve the controllability of the rolling distance. This abutment may be an indirect abutment via another member.

  As in this embodiment, it is preferable that the rear surface b2 of the rear convex portion fp is bonded or abutted on the bottom surface b4 of the sub-recessed portion r2. By this adhesion or contact, excessive deformation of the face member f1 can be further suppressed. Due to this contact or adhesion, variations in the hitting direction can be suppressed. This contact or adhesion can improve the controllability of the rolling distance. This abutment may be an indirect abutment via another member.

  FIG. 11 is a diagram for explaining the occupied area S1 of the rear convex part fp and the total area S2 on the back side of the main body part fh.

  In the upper diagram of FIG. 11, the target area of the total area S2 on the back side of the main body portion fh is indicated by wavy hatching. The total area S2 is equal to the area of the rear surface b1 when it is assumed that the rear convex portion fp has been removed. In the present embodiment, the total area S2 is equal to the internal area of the contour line k2 of the rear surface b1. In the present embodiment, the total area S2 is equal to the area of the front surface Ff of the main body part fh.

  In the lower diagram of FIG. 11, the target area of the occupied area S1 is indicated by wavy hatching. The occupied area S1 is equal to the area inside the boundary line k1 (see FIG. 10) between the main body part fh and the rear convex part fp. In the present embodiment, the cross-sectional area of the rear convex portion fp is constant at every position in the protruding direction. Therefore, in the present embodiment, the occupied area S1 is equal to the area of the rear surface b2. When there are a plurality of rear convex portions fp, the occupied area S1 is the total occupied area of the plurality of rear convex portions fp. In the embodiment of FIG. 11, the total area of the two rectangles is the occupied area S1.

From the viewpoint of increasing the engagement between the side surface s2 and the side surface s4 and suppressing unnecessary deformation of the face member f1, the ratio (S1 / S2) of the occupied area S1 (mm ² ) to the area S2 (mm ² ) is 0.1 or more is preferable, and 0.2 or more is more preferable. When the rear convex part fp is excessively wide, the average thickness of the face member f1 may be excessive, and the face member f1 may be excessively deformed. In this respect, the ratio (S1 / S2) is preferably 0.7 or less, and more preferably 0.5 or less.

  The number of back side convex parts fp is not limited. When the number of the rear convex portions fp is 1, and the single rear convex portion fp is wide, the portion where the thickness of the face member f1 is large becomes wide. In this case, a soft feel at impact is easily obtained, but deformation of the face member f1 may be excessive. This excessive deformation can reduce the controllability of the hit ball. From the viewpoint of achieving both a soft feel at impact and controllability, it is preferable to disperse the narrow rear convex portion fp into a plurality. Therefore, the number of the rear convex portions fp is preferably 2 or more. From the viewpoint of improving the workability of the step of mounting the face member f1 on the head body, the number of the rear convex portions fp is preferably 10 or less, more preferably 5 or less, and more preferably 3 or less.

  The Shore D hardness h of the face member is not limited. In light of improving the feel at impact, the hardness h is preferably equal to or greater than 40, and more preferably equal to or greater than 50. From the viewpoint of controllability, the hardness h is preferably 90 or less, more preferably 80 or less, and more preferably 70 or less.

  The hardness h is measured in accordance with the provisions of “ASTM-D 2240-68”. For the measurement, an automatic rubber hardness measuring machine (trade name “P1”, available from Kobunshi Keiki Co., Ltd.) equipped with a Shore D hardness tester is used. For the measurement, a sheet made of the same material as the face member f1 and having a thickness of about 2 mm is used. Prior to measurement, the sheet is stored at a temperature of 23 ° C. for 2 weeks. At the time of measurement, three sheets are overlaid.

  The thickness t1 of the main body part fh is not limited. From the viewpoint of improving the feel at impact, the thickness t1 is preferably 1 mm or more, more preferably 1.5 mm or more, and more preferably 2 mm or more. From the viewpoint of controllability, the thickness t1 is preferably 5 mm or less, more preferably 4 mm or less, and more preferably 3 mm or less.

  The thickness t2 of the rear convex part fp is not limited. From the viewpoint of enhancing the deformation suppressing effect due to the engagement between the side surface s2 and the side surface s4, the thickness t2 is preferably 1 mm or more, and more preferably 1.5 mm or more. When the thickness t2 is excessively increased, the deformation suppression effect does not increase for the increase of the thickness t2. In consideration of restrictions on the head design, the thickness t2 may be 5 mm or less, further 4 mm or less, and further 3 mm or less.

  The ratio (h / t1) of the hardness h to the thickness t1 (mm) is not limited. In consideration of the balance between feel at impact and controllability, the ratio (h / t1) is preferably 15 or more, more preferably 20 or more, and more preferably 25 or more. In consideration of the balance between feel at impact and controllability, the ratio (h / t1) is preferably 50 or less, more preferably 40 or less, and even more preferably 35 or less.

  When the thickness t1 is excessively small, it is difficult to obtain a soft feel at impact. From this viewpoint, the ratio (t1 / t2) of the thickness t1 to the thickness t2 is preferably 0.5 or more, more preferably 0.7 or more, and more preferably 1 or more. When the thickness t2 is relatively small with respect to the thickness t1, the deformation suppressing effect due to the engagement between the side surface s2 and the side surface s4 may not be sufficiently obtained. In addition, when the thickness t1 is excessive, the direction of the hit ball may vary. In consideration of restrictions on the dimensions of the head, the ratio (t1 / t2) is preferably 5 or less, more preferably 3 or less, and more preferably 2 or less.

  The contour line k2 of the rear surface b1 and the boundary line k1 (the boundary line k1 between the main body part fh and the rear convex part fp) are preferably separated from each other. In other words, it is preferable that the rear convex part fp is separated from the outer edge of the main body part fh. By this separation, deformation at a position away from the outer edge (contour line k2) of the main body portion fh can be effectively suppressed. Therefore, the deformation suppressing effect due to the engagement between the side surface s2 and the side surface s4 can be improved.

  As described above, in the present invention, the above-described deformation suppression effect is achieved by the engagement between the side surface s2 of the rear-side convex portion fp and the side surface s4 of the sub-recessed portion r2. Due to this deformation suppressing effect, both soft feel and controllability can be achieved.

  The effect of the present invention can also be explained as follows. When the controllability is the same level when there is no rear projection fp and when there is a rear projection fp, the head with the rear projection fp is more than the head without the rear projection fp. The shot feeling is good (soft). Further, when the feel at impact is the same in the case where there is no rear convex portion fp and in the case where there is a rear convex portion fp, the head with the rear convex portion fp is more than the head without the rear convex portion fp. Also, the controllability is good.

  12 is a view of the head main body h1 of the head 40 of the second embodiment as viewed from the face side, and FIG. 13 is a view of the face member f1 of the head 40 of the second embodiment as viewed from the rear side. In the head 40, the number of rear convex portions fp is one. In the head 40, the number of sub-recesses r2 is also one. The head 40 is the same as the head 2 except for the number of rear projections fp, the size of the rear projections fp, the number of sub-recesses r2, and the size of the sub-recesses r2.

  FIG. 14 is a view of the head body h1 of the head 42 of the third embodiment as seen from the face side, and FIG. 15 is a view of the face member f1 of the head 42 of the third embodiment as seen from the rear side. In the head 42, the number of the rear convex portions fp is three. In this head 42, the number of sub-recesses r2 is also three. The head 42 is the same as the head 2 except for the number of rear protrusions fp, the size of the rear protrusions fp, the number of sub-recesses r2, and the size of the sub-recesses r2.

  The material of the head body h1 is metal. Examples of the material of the head main body h1 include stainless steel, aluminum alloy, soft iron (soft steel), brass, pure titanium, and titanium alloy. The head body h1 may be manufactured by combining a plurality of materials. The head body h1 may be manufactured by combining a plurality of members. The head main body h1 may be made of only metal or a combination of metal and nonmetal. In the case of the head main body h1 in which a metal and a non-metal are combined, the surface of the main recess r1 and the surface of the sub-recess r2 are all metal from the viewpoint of making the effect of improving the shot feeling by the face member f1 more apparent. Is preferred.

  The manufacturing method of the head body h1 is not limited. Examples of the method for manufacturing the head main body h1 include casting, forging, and cutting (cutting). It may be the head body h1 in which a plurality of members are joined. Examples of this joining include welding, press-fitting, and adhesion using an adhesive.

  The material of the face member f1 is an elastic material. Examples of the elastic material include resin and rubber. Examples of this resin include ionomer resins, urethane resins, urethane elastomers, and polyester elastomers. Examples of the urethane elastomer include thermoplastic elastomers having a hard segment and a soft segment. A urethane resin that is relatively easy to process and has an appropriate hardness can be suitably used. Examples of the rubber include styrene butadiene rubber and butadiene rubber.

  The joining method of the head body h1 and the face member f1 is not limited. Examples of the bonding include bonding with a double-sided tape, bonding with an adhesive, and press-fitting. Adhesion with a double-sided tape and an adhesive may be used in combination.

When the area of the front surface Ff of the main body part fh is too narrow, it may be difficult to obtain a soft feel at impact due to a shift in hitting points or the like. In this respect, the area of the front surface Ff is preferably 8 cm ² or more, more preferably 9 cm ² or more, and still more preferably 10 cm ² or more. Considering the size of the head, the area of the front surface Ff is preferably 20 cm ² or less, more preferably 18cm ² or less.

When the total area S2 is too narrow, it may be difficult to obtain a soft feel at impact due to misalignment of hit points. In this respect, the total area S2 is preferably 8 cm ² or more, more preferably 9 cm ² or more, and still more preferably 10 cm ² or more. Considering the size of the head, the total area S2 is preferably 20 cm ² or less, more preferably 18cm ² or less.

  From the viewpoint of increasing the total area S2, the maximum width W1 in the toe-heel direction (see FIG. 2) is preferably 80 mm or more, more preferably 85 mm or more, and particularly preferably 90 mm or more. From the viewpoint of suppressing difficulty in addressing, the maximum width W1 in the toe-heel direction is preferably 130 mm or less, more preferably 120 mm or less, and particularly preferably 110 mm or less.

  The maximum width W2 (refer to FIG. 2) in the face-back direction is preferably 20 mm or more from the viewpoint of increasing the depth of the center of gravity and suppressing variation in directionality at the time of a miss hit and improving the stability of the stroke. The above is more preferable, and 40 mm or more is particularly preferable. From the viewpoint of suppressing an excessive increase in head weight, the maximum width W2 in the face-back direction is preferably 120 mm or less, more preferably 110 mm or less, and particularly preferably 100 mm or less.

  From the viewpoint of suppressing the club balance from becoming too light and stabilizing the swing, the head mass is preferably 300 g or more, more preferably 315 g or more, and particularly preferably 330 g or more. The head mass is preferably 400 g or less, more preferably 385 g or less, and particularly preferably 370 g or less from the viewpoint of suppressing excessively heavy club balance and facilitating swinging.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Example 1]
A head similar to the head 4 shown in FIG. The head body was produced by lost wax precision casting. The material of the head body was SUS304. The face member was manufactured by injection molding. The material of the face member was thermoplastic polyurethane. The thickness t1 was 2 mm, and the thickness t2 was 2 mm. The head body and the face member were bonded with a double-sided tape. The portion bonded with the double-sided tape was the bottom surface b3 of the main recess r1 and the rear surface b1 of the main body portion fh. The side surface s3 of the main recess r1 and the side surface s1 of the main body portion fh are in contact with each other and are not bonded. The side surface s4 of the sub-recess r2 and the side surface s2 of the rear projection fp are in direct contact with each other and are not bonded. The bottom surface b4 of the sub-concave portion r2 and the rear surface b2 of the rear convex portion fp are in direct contact and are not bonded. A product name “# 5000” manufactured by Nitto Denko Corporation was used as the double-sided tape. The gap between the side surface s1 of the main body part fh and the side surface s3 of the head main body h1 was filled with paint. Thus, a golf putter head according to Example 1 was obtained. A grip and a shaft were attached to this head to obtain a putter similar to that shown in FIG. The specifications and evaluation results of Example 1 are shown in Table 1 below.

[Examples 2 and 3]
The heads and putters of Examples 2 and 3 were obtained in the same manner as Example 1 except for the specifications shown in Table 1. That is, the heads and putters of Examples 2 and 3 were obtained in the same manner as Example 1 except that the hardness h was changed. These specifications and evaluation results are shown in Table 1 below.

[Example 4]
The head and putter of Example 4 were obtained in the same manner as Example 2 except that the width in the toe-heel direction of the two rear convex portions was reduced and the ratio (S1 / S2) was changed. The specifications and evaluation results of Example 4 are shown in Table 2 below.

[Example 5]
The head and putter of Example 5 were obtained in the same manner as Example 2 except that the width in the toe-heel direction of the two rear convex portions was decreased and the ratio (S1 / S2) was changed. The specifications and evaluation results of Example 5 are shown in Table 2 below.

[Example 6]
The head and putter of Example 6 were obtained in the same manner as in Example 2 except that the vertical width of the two rear convex portions was increased and the ratio (S1 / S2) was changed. The specifications and evaluation results of Example 6 are shown in Table 2 below.

[Example 7]
The head and putter of Example 7 were obtained in the same manner as Example 2 except that the vertical width and the toe-heel direction width of the two rear convex portions were increased and the ratio (S1 / S2) was changed. The specifications and evaluation results of Example 7 are shown in Table 2 below.

[Example 8]
Example 1 is the same as Example 2 except that the number of the rear protrusions fp is 1, the shape of the face member f1 is as shown in FIG. 13, and the shape of the head body h1 is as shown in FIG. 8 heads and putters were obtained. The specifications and evaluation results of Example 8 are shown in Table 2 below.

[Example 9]
The embodiment is the same as the embodiment 2, except that the number of the rear protrusions fp is 3, the shape of the face member f1 is as shown in FIG. 15, and the shape of the head body h1 is as shown in FIG. Nine heads and putters were obtained. The specifications and evaluation results of Example 9 are shown in Table 2 below.

[Comparative Example 1]
A head and a putter of Comparative Example 1 were obtained in the same manner as in Example 1 except that the rear convex portion and the sub concave portion were not present. In Comparative Example 1, the thickness of the face member f1 was constant at 2 mm, and the depth of the concave portion that accommodates the face member f1 was also constant at 2 mm. The specifications and evaluation results of Comparative Example 1 are shown in Table 1 below.

[Comparative Example 2]
A head and a putter of Comparative Example 2 were obtained in the same manner as in Example 2 except that the rear convex part and the sub concave part were not present. In Comparative Example 2, the thickness of the face member f1 was constant at 2 mm, and the depth of the recess that accommodates the face member f1 was also constant at 2 mm. The specifications and evaluation results of Comparative Example 2 are shown in Table 1 below.

[Comparative Example 3]
A head and a putter of Comparative Example 3 were obtained in the same manner as in Example 3 except that the rear convex portion and the sub concave portion were not present. In Comparative Example 3, the thickness of the face member f1 was constant at 2 mm, and the depth of the concave portion that accommodates the face member f1 was also constant at 2 mm. The specifications and evaluation results of Comparative Example 3 are shown in Table 1 below.

  [Evaluation methods]

  The evaluation method of the hardness h is as described above.

  Other evaluation methods are as follows.

[Hit feel evaluation]
Putting was actually performed using a golf ball (trade name “Z-UR”) commercially available from SRI Sports. Ten golfers tested. A golfer put 5 balls for each club, aiming for a cup 6m ahead. Each golfer evaluated the feel at impact in five levels based on the following criteria. The higher the score, the higher the evaluation.
5 points ... very soft 4 points ... soft 3 points ... normal 2 points ... hard 1 point ... very hard The average values of 10 golfers are shown in Tables 1 and 2 below. Shown in

[Vertical deviation index Z1]
In the hit feeling test, the distance between the position where the ball stopped and the cup was measured. This distance was measured along a straight line L connecting the ball launch position and the cup. For each club, the average value of all the hit balls (50 balls) was calculated. The average value was indexed by setting Comparative Example 2 to 1.0, thereby obtaining a longitudinal deviation index Z1. The evaluation results of the vertical deviation index Z1 are shown in Tables 1 and 2 below. It shows that control property of rolling distance is so bad that the vertical shift index Z1 is large.

[Horizontal deviation index Z2]
In the hit feeling test, the shortest distance between the straight line L and the position where the ball stopped was measured. For each club, the average value of all the hit balls (50 balls) was calculated. The average value was indexed with Comparative Example 2 as 1.0, thereby obtaining a lateral deviation index Z2. The evaluation results of the lateral deviation index Z2 are shown in Tables 1 and 2 below. The larger the lateral displacement index Z2, the worse the controllability of the direction.

  When Comparative Example 1 and Example 2 are compared, the feel at impact is comparable, but Example 2 is superior to Comparative Example 1 in terms of controllability. Further, when Comparative Example 2 and Example 3 are compared, the feel at impact is comparable, but with respect to controllability, Example 3 is superior to Comparative Example 2. Thus, according to the present invention, it is possible to achieve both hit feeling and controllability.

  From the results in Table 2, it can be seen that when the ratio (S1 / S2) is small, the feel at impact tends to deteriorate. However, although Example 4 has a small ratio (S1 / S2), the controllability is comparable to that of Comparative Example 2, and with respect to feel at impact, Example 4 is superior to Comparative Example 2. Yes.

  From the results in Table 2, it can be seen that when the ratio (S1 / S2) is large, the controllability tends to deteriorate. However, in Example 6, although the ratio (S1 / S2) is relatively large, the controllability is comparable to that of Comparative Example 1, and in terms of feel at impact, Example 6 is more than Comparative Example 1. Are better.

  When Example 2, Example 8, and Example 9 are compared, the greater the number of rear convex portions, the smaller (Z1 + Z2), and the better the controllability.

  When the evaluation results shown in Table 1 and Table 2 are analyzed, it can be seen that the example is superior to the comparative example. From this evaluation result, the superiority of the present invention is clear.

FIG. 1 is an overall view of a golf putter according to an embodiment of the present invention. FIG. 2 is a top view of a golf putter head according to an embodiment of the present invention. FIG. 3 is a view of the head of FIG. 2 as viewed from the face surface side. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is an enlarged view of a part of FIG. FIG. 7 is a view of the head body of the head of FIG. 2 as viewed from the face surface side. FIG. 8 is a cross-sectional view illustrating only the head main body h1 of FIG. FIG. 9 is a view of the face member of the head of FIG. 2 as viewed from the rear side (back side). FIG. 10 is a cross-sectional view taken along line F10-F10 in FIG. FIG. 11 is a diagram illustrating a region having an area S1 and an area S2. FIG. 12 is a view of the head body according to the second embodiment as viewed from the face side. FIG. 13 is a view of the face member according to the second embodiment as seen from the rear side (back side). FIG. 14 is a view of the head body according to the third embodiment as seen from the face surface side. FIG. 15 is a view of the face member according to the third embodiment as viewed from the rear side (back side).

Explanation of symbols

2 ... Golf putter 4, 40, 42 ... Head 6 ... Grip 8 ... Shaft 10 ... Face surface 12 ... Sole surface 14 ... Upper surface 16 ... Shaft hole f1. ..Face member fp... Rear convex portion fh... Main body portion Ff... Front surface of face member r1... Main concave portion r2. Side surface of rear convex portion s3 ... Side surface of main concave portion s4 ... Side surface of sub concave portion b1 ... Rear surface of main body portion b2 ... Rear surface of rear convex portion b3 ... Bottom surface of main concave portion b4. ..Bottom surface of sub-recess

Claims (5)

A head body made of metal and a face member made of an elastic material;
The face member has a main body portion and a rear convex portion provided on the rear side of the main body portion,
The entire face member is integrally molded,
The front surface of the main body is at least part of the face surface;
The head main body has a main concave portion that accommodates the main body portion, and a sub concave portion that is provided inside the main concave portion and accommodates the rear convex portion,
The side surface of the main body is adhered or in contact with the side surface of the main recess,
The rear surface of the main body is adhered or abutted to the bottom surface of the main recess,
A golf putter head in which a side surface of the rear convex portion is adhered or abutted on a side surface of the sub concave portion. When the occupation area of the rear convex portion is S1 (mm ² ) and the total area of the back side of the main body portion is S2 (mm ² ), the ratio (S1 / S2) is 0.1 or more and 0.7 or less. The golf putter head according to claim 1.   The golf putter head according to claim 1, wherein the number of the rear convex portions is two or more.   The ratio (t1 / t2) is not less than 0.5 and not more than 5 when the thickness of the main body is t1 (mm) and the thickness of the rear projection is t2 (mm). The golf putter head according to any one of the above.   The ratio (h / t1) is 15 or more and 50 or less when the Shore D hardness of the face member is h and the thickness of the main body is t1 (mm). Golf putter head.

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