JP2008136524A - Putter type golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a putter type golf club which makes a smooth swing possible with a higher stability. <P>SOLUTION: A head 2 belongs to the putter type golf club. The head 2 includes a face part 4, a back part 6, a toe link part 8 and a heel link part 10. The heights H at points of the lower surface of the head 2 are prescribed as follows: the height H(c1) at the point c1 is larger than the height H (c4) at the point c4, the height H(h1) at the point h1 is larger than the height H(h5) at the point h5, the height H(t1) at the point t1 is larger than the height H(t5) at the point t5, the height H(h5) at the point h5 is larger than the height H(c4) at the point c4 and the height H(t5) at the point t5 is larger than the height H(c4) at the point c4. [H(h1)-H(h5)] is larger than [H(c1)-H(c4)], and [H(t1)-H(t5)] is larger than [H(c1)-H(c4)]. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a putter type golf club.

As a head of a putter type golf club, a head including a face member, a first arm extending substantially rearward from a heel end portion of the face member, and a second arm extending substantially rearward from a toe end portion of the face member. It has been proposed (see JP 2005-199073). This head can contribute to an increase in the moment of inertia.
JP 2005-199073 A

  Hereinafter, the height of the bottom surface of the head from the ground contact surface is also referred to as “floating”. Hereinafter, the stability of the head posture at the time of addressing is also referred to as “sitting”. These terms are expressions that have become established in the art.

  The head according to Japanese Patent Laid-Open No. 2005-199073 has a heavy toe portion and heel portion of the head. When the toe portion and the heel portion have large floats, the head tends to tilt toward the toe side or the heel side, and the head sits worse. On the other hand, when the toe portion and the heel portion have small floats, the sitting can be improved. However, in this case, the toe portion or the heel portion tends to contact the ground during the swing. This contact prevents a smooth swing.

  An object of the present invention is to provide a putter-type golf club that is easy to sit on and can swing smoothly.

  The putter type golf club according to the present invention includes a face portion having a face surface, a back portion extending rearward from the center portion of the face portion, and extending from the toe side of the face portion to the rear of the back portion. A toe connection part and a heel connection part extending from the heel side of the face part to the back of the back part. In this head, the height H from the reference ground plane at each point on the lower surface of the head satisfies the following (a) to (g).

  (A) The height H (c1) at the point c1 is equal to or higher than the height H (c4) at the point c4.

  (B) The height H (h1) at the point h1 is higher than the height H (h5) at the point h5.

  (C) The height H (t1) at the point t1 is higher than the height H (t5) at the point t5.

  (D) The height H (h5) at the point h5 is greater than or equal to the height H (c4) at the point c4.

  (E) The height H (t5) at the point t5 is greater than or equal to the height H (c4) at the point c4.

  (F) [H (h1) -H (h5)] is larger than [H (c1) -H (c4)].

  (G) [H (t1) -H (t5)] is larger than [H (c1) -H (c4)].

  However, the point (h1) is the center point in the face-back direction of the heel connection part at the connection part with the back part. The point (t1) is a center point in the face-back direction of the toe connection part at the connection part with the back part. The position in the face-back direction of the point (c1) is the same as the point (h1) and the point (t1). The positions in the face-back direction of the point (c4), the point (h5), and the point (t5) are positions separated by 5 mm from the leading edge center point. The positions in the toe-heel direction of the point (c1) and the point (c4) are the same as the face center fc. The position in the toe / heel direction of the point (h5) is the center position in the toe / heel direction of the heel connection part at the connection part with the face part. The position in the toe / heel direction at the point (t5) is the center position in the toe / heel direction of the toe connection part at the connection part with the face part.

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

  FIG. 1 is a plan view showing a head 2 of a putter type golf club according to an embodiment of the present invention. FIG. 1 shows the head 2 as viewed from above. FIG. 2 is a side view of the head 2 as viewed from the heel side. FIG. 3 is a front view of the head 2 as viewed from the face side. 4 and 5 are bottom views of the head 2 as viewed from below. 6 is a cross-sectional view taken along the line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

  The head 2 has a face part 4, a back part 6, a toe connection part 8 and a heel connection part 10. The face portion 4 has a face surface 12. The face portion 4 has a back surface 14. The back surface 14 is a surface opposite to the face surface 12. The face surface 12 is a flat surface. The back surface 14 is a plane. The back portion 6 extends rearward from the center portion of the face portion 4. The back portion 6 extends in the face-back direction. The toe connection part 8 extends from the toe side of the face part 4 to the back of the back part 6. The toe connection part 8 extends from the toe side end of the face part 4 to the rear of the back part 6. The toe link 8 extends from the back surface 14. The heel connecting portion 10 extends from the heel side of the face portion 4 to the back of the back portion 6. The heel connecting portion 10 extends from the heel side end of the face portion 4 to the back of the back portion 6. The heel link 10 extends from the back surface 14.

  The face surface 12 has a face center fc. The face center fc is the center of gravity of the face surface 12. When the face surface 12 is a plane, the face center fc is the centroid of the face surface 12.

  As shown in FIGS. 1, 3, 4, 6, and 7, the shape of the head 2 is substantially the same as a plane parallel to the face-back direction through the face center fc except for the shaft hole 11. Symmetric. This symmetry contributes to the ease of addressing. Due to this symmetry, the hit point tends to approach the face center fc. Due to this symmetry, the direction of the hit ball is difficult to shift from side to side.

  As shown in FIG. 1, the face portion 4 has a shaft hole 11. A shaft tip (not shown) is bonded to the shaft hole 11 while being inserted. Although not shown, a grip is attached to the rear end of the shaft. A shaft and a grip are attached to the head 2 to complete a putter type golf club.

  As shown in FIGS. 3 and 8, the face plate 4 is provided with a face plate 15. The face plate 15 is made of, for example, a resin such as urethane resin or a metal such as copper. The face plate 15 constitutes a part of the face surface 12. The face plate 15 improves the feel at impact.

  As shown in FIG. 3, the lower surface 4a of the face portion 4 has a round shape. The toe side end of the lower surface 4a of the face part 4 is higher than the center of the lower surface 4a in the toe / heel direction. The heel side end of the lower surface 4a of the face part 4 is higher than the center of the lower surface 4a in the toe / heel direction. The entire lower surface 4a of the face portion 4 is smoothly continuous.

  A space k1 exists on the heel side of the toe link 8. The space k1 exists between the toe link part 8 and the back part 6. A space k <b> 2 exists on the toe side of the heel connection part 10. The space k2 is located between the heel connecting part 10 and the back part 6.

  The weight of the head 2 is distributed to the toe side and the heel side by the toe connection part 8 and the heel connection part 10. This distribution increases the moment of inertia of the head 2. By increasing the moment of inertia, the directionality of the hit ball is improved.

  The face portion 4, the back portion 6, the toe link portion 8, and the heel link portion 10 are separate members. Each member is bonded to each other with an adhesive. Furthermore, each member is mutually fitted. As shown in FIGS. 1 and 2, the convex portion 18 of the toe connecting portion 8 and the heel connecting portion 10 and the concave portion 16 of the face portion 4 are fitted. The concave portion 16 of the back portion 6 and the convex portion 18 of the face portion 4 are fitted. The rear end portion of the toe connecting portion 8 and the concave portion 16 of the back portion 6 are fitted. The rear end portion of the heel connecting portion 10 and the concave portion 16 of the back portion 6 are fitted.

  In addition, the joining method of each member is not limited to the above-mentioned fitting and adhesion | attachment, Joining by a screw | thread, joining by a rivet, welding, etc. can be employ | adopted.

  The face part 4, the back part 6, the toe connection part 8, and the heel connection part 10 are made of an aluminum alloy. As the material of the head, for example, a metal such as an aluminum alloy, brass, stainless steel, copper, titanium alloy, or iron, or a resin such as urethane resin, epoxy resin, or ionomer resin can be employed. The head may be made of a single material or may be made of a plurality of materials.

  As shown in FIGS. 6 and 7, the cross-sectional shape of the upper surface of the back portion 6 is an arc shape. The cross-sectional shape of the back part 6 is D-shaped. The back portion 6 has a shape in which a chamfer is provided at one circumferential direction of a round bar having a circular cross section. The back portion 6 constitutes a part of the lower surface of the head 2 and has a bottom surface 19 having a straight section in the toe / heel direction. The entire bottom surface 19 is continuous without a step. The bottom surface 19 is composed of a plurality of planes. The bottom surface 19 includes a first plane 19a and a second plane 19b. The boundary between the first plane 19a and the second plane 19b is a ridge line r (see FIG. 4). The first plane 19 a is adjacent to the lower surface 4 a of the face portion 4. The first plane 19a and the second plane 19b are continuous without a step. The second flat surface 19b gradually increases from the face surface side toward the back side.

  The first plane 19a is included in the reference ground plane s. The reference ground plane s will be described later. In FIG. 4, what is indicated by a double-headed arrow W3 is the toe-heel direction width of the first plane 19a. This first plane 19a contributes to good sitting. From the viewpoint of improving sitting, the width W3 is preferably 15 mm or more, more preferably 20 mm or more, and more preferably 25 mm or more. From the viewpoint of improving swinging, the width W3 is preferably 50 mm or less, more preferably 45 mm or less, and more preferably 40 mm or less.

  In FIG. 4, the double arrow W4 indicates the maximum width in the face-back direction from the leading edge L to the rear end of the first plane 19a. From the viewpoint of improving sitting, the width W4 is preferably 40 mm or more, more preferably 50 mm or more, and particularly preferably 60 mm or more. From the viewpoint of improving swinging, the width W4 is preferably 90 mm or less, more preferably 80 mm or less, and more preferably 70 mm or less.

  The back portion 6 is located at the center of the face surface 12 in the toe-heel direction. The back portion 6 has two contour lines 20 extending in the face-back direction. In the toe-heel direction, the center between the two contour lines 20 coincides with the face center fc.

  As shown in FIGS. 6 and 7, the cross-sectional shape of the toe connecting portion 8 is slightly flat. The lower surface of the toe connection part 8 is smoothly continuous over the entire surface. As shown in FIGS. 6 and 7, the cross-sectional shape of the heel connecting portion 10 is slightly flat. The lower surface of the heel connecting part 10 is smoothly continuous over the entire surface.

  The lower surface 4a of the face part 4 and the lower surface of the toe connecting part 8 are smoothly continuous. The lower surface of the face portion 4 and the lower surface of the heel connecting portion 10 are smoothly continuous. The lower surface of the face portion 4 and the bottom surface 19 of the back portion 6 are smoothly continuous. The smooth continuity of the bottom surface contributes to good swinging.

  At every point, the height of the lower surface of the toe link 8 is equal to or higher than the height of the reference ground plane s. This makes it difficult for the toe connecting portion 8 to be grounded during swinging, and swinging is improved. At every point, the height of the lower surface of the heel connecting portion 10 is equal to or higher than the height of the reference ground plane s. This makes it difficult for the heel connecting portion 10 to be grounded during swinging, and swinging is improved. The reference ground plane s will be described later.

  At every point, the height of the lower surface of the head 2 is equal to or higher than the height of the reference ground plane s. This bottom surface shape suppresses contact between the head 2 and the ground in the second half of the hit ball. This bottom surface shape contributes to good swing-out.

  In FIG. 2, a double arrow α indicates a range in which the distance in the face-back direction from the leading edge center point is 5 mm or more in the lower surface 4 a of the face portion 4. In FIG. 2, what is indicated by a double arrow β is a range in which the distance in the face-back direction from the center point of the leading edge on the lower surface of the head 2 is 5 mm or more. In FIG. 2, a double arrow γ indicates a range in which the distance in the face / back direction from the leading edge center point is less than 5 mm on the lower surface of the head 2. In FIG. 2, what is indicated by a double arrow HL is the height of the leading edge from the reference ground plane s.

  In every toe-heel direction cross section, the height of the lowest point of the toe connection part 8 is equal to or higher than the height of the highest point of the bottom surface 19. The height of the lowest point of the heel connecting portion 10 is equal to or higher than the height of the highest point of the bottom surface 19 in all toe-heel direction cross sections.

  At any position in the toe-heel direction, the cross section along the face-back direction in the range α of the lower surface 4a of the face portion 4 is parallel to the reference ground surface s or becomes higher from the face side toward the back side. It is inclined to. This bottom surface shape contributes to good swing-out. The range γ is parallel to the reference ground plane s or inclined so as to increase from the back side toward the face side. The height HL is preferably 0 mm or more, more preferably 0.3 mm or more, and particularly preferably 0.5 mm or more. The height HL is preferably 3 mm or less, more preferably 2 mm or less, and particularly preferably 1.5 mm or less. Such a shape of the range γ contributes to good swing-out at the start of hitting.

  In every toe-heel direction position, the cross-section along the face-back direction of the lower surface of the back portion 6 is parallel to the reference ground surface s or inclined so as to increase from the face side toward the back side. Yes. This bottom surface shape contributes to good swing-out.

  At any position in the toe-heel direction, the cross section along the face-back direction of the range β may be parallel to the reference ground surface s or may be inclined so as to become higher from the face side toward the back side. . This bottom surface shape contributes to good swing-out. Note that the range γ is preferably parallel to the reference ground surface s or inclined so as to increase from the back side toward the face side. Further, the height HL is preferably 0 mm or more, more preferably 0.3 mm or more, and particularly preferably 0.5 mm or more. The height HL is preferably 3 mm or less, more preferably 2 mm or less, and particularly preferably 1.5 mm or less. Such a shape of the range γ contributes to good swing-out at the start of hitting.

  The lower surface of the head 2 is a surface that can be viewed from below. The lower surface of the head 2 is a portion of the surface of the head 2 illustrated in FIG.

  In putting, it is very important to accurately match the orientation of the face surface 12 with the target direction. In order to accurately hit the ball with respect to the target direction, it is extremely important to perform takeback (hereinafter also referred to as straight takeback) so that the trajectory of the head follows the extension line of the target direction. The back portion 6 extending in the toe-heel direction makes it easy to align the face surface 12 with the target direction. The back portion 6 extending in the toe-heel direction facilitates straight take-back. These effects are enhanced by making the width of the back portion 6 in the toe-heel direction close to that of the golf ball. From this viewpoint, the toe-heel direction width W1 (see FIG. 4) of the back portion 6 is preferably 30 mm or more and 50 mm or less.

The contour line 20 extending in the toe-heel direction makes it easier to align the face surface 12 with the target direction. The contour line 20 extending in the toe-heel direction facilitates straight takeback. These effects are enhanced by making the distance between the two contour lines 20 in the toe-heel direction closer to the golf ball. From this viewpoint, the toe-heel direction width W2 (see FIG. 4) of the back portion 6 is preferably 30 mm or more and 50 mm or less.

  In the present embodiment, the height H from the reference ground plane s at each point on the lower surface of the head is defined. The height H at each point is related to the sitting (sitting) of the head. The height H at each point is related to the swinging of the head. In the present application, “height” means a height from the reference ground plane s.

  Each point on the lower surface of the head is shown in FIG. 4 and 5 are the same drawing. FIG. 5 is shown separately from FIG. 4 in order to avoid the crowding of signs.

  As points on the lower surface of the head, points (c1) to (c5), points (h1) to (h5), and points (t1) to (t5) are defined. Each of these points is shown in FIG. The definition of each point is as follows.

[Point (c1)]
Toe-heel direction position: Same as the face center fc.
Face-back direction position: same as point (h1). Same as point (t1).

[Point (c2)]
Toe-heel direction position: Same as the face center fc.
Face-back direction position: A position separated from the point c5 by a length L2. However, the length L2 is 0.6 times the maximum width L1 in the toe-heel direction of the head.

[Point (c3)]
Toe-heel direction position: Same as the face center fc.
Face-back direction position: A position separated from the point c4 by a length (L4 / 2). However, the length L4 is the length in the face-back direction from the point c1 to the point c4.

[Point (c4)]
Toe-heel direction position: Same as the face center fc.
Face-back direction position: A position 5 mm away from the leading edge center point. In other words, a position 5 mm away from the point (c5).

[Point c5)]
This is a point on the leading edge L at the same toe-heel direction position as the face center fc. In the present application, this point (c5) is also referred to as a leading edge center point.

[Point (h1)]
The center point in the face-back direction of the heel connecting portion 10 at the connecting portion with the back portion b. More specifically, the point (h1) is the center point in the face-back direction between the back-side end point p1 of the heel connecting portion 10 and the face-side end point p2 at the connecting portion with the back portion b (FIG. 5). reference). The end point p1 and the end point p2 may have different toe / heel direction positions.

[Point (h2)]
Toe-heel direction position: The center position in the toe-heel direction of the heel connecting portion 10 in the face-back direction position separated from the point c5 by the length L2.
Face-back direction position: A position separated from the point c5 by a length L2.

[Point (h3)]
Toe-heel direction position: The center position in the toe-heel direction of the heel connecting portion 10 in the face-back direction position separated from the point c4 by the length (L4 / 2).
Face-back direction position: A position separated from the point c4 by a length (L4 / 2).

[Point (h4)]
Toe-heel direction position: same as point (h2).
Face-back direction position: same as point (c4).

[Point (h5)]
Toe / heel direction position: The center position of the heel connection part 10 in the toe / heel direction at the connection part with the face part f. More specifically, the position of the point (h5) in the toe / heel direction is the center of the toe / heel direction between the toe side end point p3 of the heel connection part 10 and the end point p4 on the heel side at the connection part with the face part 4. Position (see FIG. 5). Note that the end point p1 and the end point p2 may have different positions in the face / back direction.
Face-back direction position: same as point (c4).

[Point (t1)]
The center point in the face-back direction of the toe connection part 8 at the connection part with the back part b. More specifically, the point (t1) is the center point in the face-back direction between the back-side end point p5 of the toe connection portion 8 and the face-side end point p6 at the connection portion with the back portion b (FIG. 5). reference). The end point p5 and the end point p6 may have different toe / heel direction positions.

[Point (t2)]
Toe-heel direction position: The center position in the toe-heel direction of the toe link part 8 at the position in the face-back direction separated from the point c5 by the length L2.
Face-back direction position: A position separated from the point c5 by a length L2.

[Point (t3)]
Toe / heel direction position: The center position of the toe link part 8 in the toe / heel direction at a position in the face-back direction separated from the point c4 by the length (L4 / 2).
Face-back direction position: A position separated from the point c4 by a length (L4 / 2).

[Point (t4)]
Toe-heel direction position: same as point (t2).
Face-back direction position: same as point (c4).

[Point (t5)]
Toe / heel direction position: Toe / heel direction center position of the toe connection part 8 at the connection part with the face part f. More specifically, the position in the toe / heel direction of the point (t5) is the center of the toe / heel direction between the toe side end point p7 of the toe connection part 8 and the end point p8 on the heel side at the connection part with the face part 4. Position (see FIG. 5). The end point p7 and the end point p8 may have different positions in the face / back direction.
Face-back direction position: same as point (c4).

  The reference ground surface s includes a straight line connecting the point (c3) and the point (c4) and is a plane parallel to the straight line connecting the point (h5) and the point (t5). The height H at each point is the height from the reference ground plane s. The height H is measured in a direction perpendicular to the reference ground plane s.

  The toe-heel direction can be defined as a direction parallel to the reference ground plane s and parallel to the face surface 12. The face-back direction can be defined as a direction parallel to the reference ground plane s and perpendicular to the toe-heel direction.

  When swinging out worsens, directionality and distance characteristics (easy to adjust the distance) decrease. The difference [H (h4) −H (c4)] is preferably 0 mm or more, more preferably 0.3 mm or more, and 0.6 mm from the viewpoint of improving swinging by suppressing contact with the heel side during the stroke. The above is particularly preferable. When sitting down, the head state (head posture) changes every time addressing is performed. If the sitting is worse, the head tends to tilt in the toe-heel direction at the start of hitting. If the sitting is worse, the directionality and the distance are reduced. From the viewpoint of improving sitting, the difference [H (h4) −H (c4)] is preferably 1.5 mm or less, and more preferably 1 mm or less.

  The difference [H (t4) −H (c4)] is preferably 0 mm or more, more preferably 0.3 mm or more, and 0.6 mm from the viewpoint of improving swinging by suppressing the contact on the toe side during the stroke. The above is particularly preferable. From the viewpoint of improving sitting, the difference [H (t4) −H (c4)] is preferably 1.5 mm or less, and more preferably 1 mm or less.

  The difference [H (h5) −H (c4)] is preferably 0 mm or more, more preferably 0.5 mm or more, and more preferably 1 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the heel side during the stroke. Particularly preferred. From the viewpoint of improving sitting, the difference [H (h5) −H (c4)] is preferably 3 mm or less, and more preferably 2 mm or less.

  The difference [H (t5) −H (c4)] is preferably 0 mm or more, more preferably 0.5 mm or more, and more preferably 1 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the toe side during the stroke. Particularly preferred. From the viewpoint of improving sitting, the difference [H (t5) −H (c4)] is preferably 3 mm or less, and more preferably 2 mm or less.

  In the second half of the hit ball, the head posture is higher on the front side (face side) and lower on the rear side (back side). The second half of the hit ball is the second half of the impact and the part after the impact of the stroke. The second half of the impact is the second half of the time when the club is in contact with the ball. In the second half of the hit ball, the rear portion of the lower surface of the head approaches the ground. As the stroke progresses, the part approaching the ground moves backward. In the second half of the hit ball, the point (c3), the point (h3), and the point (t3) approach the ground. In the second half of the hit ball, the point (c2), the point (h2), and the point (t2) approach the ground. In the second half of the hit ball, the point (c1), the point (h1), and the point (t1) approach the ground.

  The influence of H (c3) and H (h3) is large in the second half of the hit ball. When the difference [H (h3) -H (c3)] is excessively large, the degree of freedom in the inclination angle of the head in the toe-heel direction is excessively large in the second half of the hit ball. The same applies when the difference [H (t3) −H (c3)] is excessively large. A golfer easily tilts the head in the toe-heel direction due to the degree of freedom. Due to this inclination, the posture of the head at the address is difficult to be reproduced by impact.

  When the difference [H (h3) −H (c3)] is excessively large, the head tends to tilt in the toe / heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (h3) −H (c3)] is preferably 1 mm or more, more preferably 1.5 mm or more, from the viewpoint of improving swinging by suppressing contact with the heel side during the stroke. The above is particularly preferable. The difference [H (h3) −H (c3)] is preferably 5 mm or less, and more preferably 3.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  In the second half of the hit ball, the point (c3) and the point (t3) approach the ground. The influence of H (c3) and H (t3) is large in the second half of the hit ball. When the difference [H (t3) −H (c3)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (t3) −H (c3)] is preferably 1 mm or more, more preferably 1.5 mm or more, from the viewpoint of improving the swing-out by suppressing the contact on the toe side during the stroke. The above is particularly preferable. The difference [H (t3) −H (c3)] is preferably 5 mm or less, and more preferably 3.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  When the difference [H (h2) −H (c2)] is excessively large, the degree of freedom in the inclination angle of the head in the toe / heel direction is large in the second half of the hit ball. The same applies when the difference [H (t2) −H (c2)] is excessively large. A golfer easily tilts the head in the toe-heel direction due to the degree of freedom.

  In the second half of the hit ball, the point (c2) and the point (h2) approach the ground. When the difference [H (h2) −H (c2)] is excessively large, the head tends to tilt in the toe / heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (h2) −H (c2)] is preferably 1.5 mm or more, more preferably 2 mm or more, and more preferably 3 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the heel side during the stroke. Particularly preferred. The difference [H (h2) −H (c2)] is preferably 13 mm or less, and more preferably 8 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  In the second half of the hit ball, the point (c2) and the point (t2) approach the ground. When the difference [H (t2) -H (c2)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (t2) −H (c2)] is preferably 1.5 mm or more, more preferably 2 mm or more, and more preferably 3 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the toe side during the stroke. Particularly preferred. The difference [H (t2) −H (c2)] is preferably 13 mm or less, and more preferably 8 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  When the difference [H (h1) −H (c1)] is excessively large, the degree of freedom of the inclination angle in the toe-heel direction is excessively large in the latter half of the hit ball. The same applies when the difference [H (t1) −H (c1)] is excessively large. A golfer easily tilts the head in the toe-heel direction due to the degree of freedom.

  In the second half of the hit ball, the point (c1) and the point (h1) approach the ground. When the difference [H (h1) −H (c1)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (h1) -H (c1)] is preferably 2 mm or more, more preferably 3 mm or more, and more preferably 4.5 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the heel side during the stroke. Particularly preferred. The difference [H (h1) −H (c1)] is preferably 16 mm or less and more preferably 10.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  In the second half of the hit ball, the point (c1) and the point (t1) approach the ground. When the difference [H (t1) −H (c1)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are deteriorated. The difference [H (t1) −H (c1)] is preferably 2 mm or more, more preferably 3 mm or more, and more preferably 4.5 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the toe side during the stroke. Particularly preferred. The difference [H (t1) −H (c1)] is preferably 16 mm or less and more preferably 10.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  When the difference [H (c1) −H (c4)] is excessively large, the degree of freedom of the tilt angle in the face-back direction is large in the second half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom. By tilting in the face-back direction, it becomes difficult to reproduce the head posture in the address state by impact. The effective loft angle at impact changes due to the inclination in the face-back direction.

  In the second half of the hit ball, the point (c1) approaches the ground. When the difference [H (c1) −H (c4)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (c1) −H (c4)] is preferably 0 mm or more, more preferably 0.5 mm or more, and more preferably 1 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the back side during the stroke. Particularly preferred. The difference [H (c1) −H (c4)] is preferably 5 mm or less, more preferably 3 mm or less, and particularly preferably 2 mm or less from the viewpoint of improving sitting and suppressing the inclination in the face-back direction in the second half of the hit ball. preferable.

  When the difference [H (h1) −H (h5)] is excessively large, the degree of freedom of the tilt angle of the head in the face-back direction is large in the second half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom.

  In the second half of the hit ball, the point (h1) approaches the ground. If the difference [H (h1) −H (h5)] is excessively large, the head tends to tilt in the face-back direction in the second half of the hitting ball, and the directionality and distance characteristics are lowered. The difference [H (h1) −H (h5)] is preferably more than 0 mm, more preferably 3 mm or more, and 4.5 mm from the viewpoint of improving the swing-out by suppressing the contact on the back side during the stroke. The above is particularly preferable. The difference [H (h1) −H (h5)] is preferably 16 mm or less and more preferably 10.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the face-back direction in the second half of the hit ball.

  When the difference [H (t1) −H (t5)] is excessively large, the degree of freedom of the tilt angle of the head in the face-back direction is large in the second half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom.

  In the second half of the hit ball, the point (t1) approaches the ground. When the difference [H (t1) −H (t5)] is excessively large, the head tends to tilt in the face-back direction in the second half of the hitting ball, and the directivity and distance characteristics are deteriorated. The difference [H (t1) −H (t5)] is preferably more than 0 mm, more preferably 3 mm or more, and 4.5 mm from the viewpoint of improving swinging by suppressing contact with the back side during the stroke. The above is particularly preferable. The difference [H (t1) −H (t5)] is preferably 16 mm or less and more preferably 10.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the face-back direction in the second half of the hit ball.

  When the difference [H (h2) −H (h5)] is excessively large, the degree of freedom of the tilt angle of the head in the face-back direction is large in the latter half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom.

  In the second half of the hit ball, the point (h2) approaches the ground. When the difference [H (h2) −H (h5)] is excessively large, the head tends to tilt in the face-back direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (h2) −H (h5)] is preferably more than 0 mm, more preferably 1 mm or more, and more preferably 2 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the back side during the stroke. Particularly preferred. The difference [H (h2) −H (h5)] is preferably 12 mm or less, and more preferably 7 mm or less from the viewpoint of improving sitting and suppressing the tilt in the face-back direction in the second half of the hit ball.

  When the difference [H (t2) −H (t5)] is excessively large, the degree of freedom of the tilt angle of the head in the face-back direction is large in the latter half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom.

  In the second half of the hit ball, the point (t2) approaches the ground. When the difference [H (t2) −H (t5)] is excessively large, the head tends to tilt in the face-back direction in the second half of the hitting ball, and the directivity and distance characteristics are deteriorated. The difference [H (t2) −H (t5)] is preferably more than 0 mm, more preferably 1 mm or more, and more preferably 2 mm or more from the viewpoint of improving the swing-out by suppressing the contact on the back side during the stroke. Particularly preferred. The difference [H (t2) −H (t5)] is preferably 12 mm or less, and more preferably 7 mm or less, from the viewpoint of improving sitting and suppressing inclination in the face-back direction in the second half of the hit ball.

  When the difference [H (h3) −H (h5)] is excessively large, the degree of freedom of the tilt angle of the head in the face-back direction is large in the second half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom.

  In the second half of the hit ball, the point (h3) approaches the ground. When the difference [H (h3) −H (h5)] is excessively large, the head tends to tilt in the face-back direction in the second half of the hitting ball, and the directionality and the distance characteristic are lowered. The difference [H (h3) −H (h5)] is preferably 0 mm or more, more preferably 0.3 mm or more, and 0.7 mm from the viewpoint of improving swinging by suppressing contact with the back side during the stroke. The above is particularly preferable. The difference [H (h3) −H (h5)] is preferably 4 mm or less, and more preferably 2.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the face-back direction in the second half of the hit ball.

  When the difference [H (t3) −H (t5)] is excessively large, the degree of freedom of the tilt angle of the head in the face-back direction is large in the second half of the hit ball. A golfer easily tilts the head in the face-back direction due to the large degree of freedom.

  In the second half of the hit ball, the point (t3) approaches the ground. When the difference [H (t3) −H (t5)] is excessively large, the head tends to tilt in the face-back direction in the second half of the hitting ball, and the directivity and distance characteristics are deteriorated. The difference [H (t3) −H (t5)] is preferably 0 mm or more, more preferably 0.3 mm or more, and 0.7 mm from the viewpoint of improving the swing-out by suppressing the contact on the back side during the stroke. The above is particularly preferable. The difference [H (t3) −H (t5)] is preferably 4 mm or less, and more preferably 2.5 mm or less, from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  In the following, the difference [H (h1) −H (h5)] is also labeled (A1), the difference [H (t1) −H (t5)] is also labeled (A2), and the difference [H (c1) − H (c4)] is also labeled (B).

  When the difference [(A1)-(B)] is excessively large, the degree of freedom in the inclination angle of the head in the toe-heel direction is large in the second half of the hit ball. A golfer can easily tilt the head in the toe-heel direction due to the degree of freedom.

  In the second half of the hit ball, the point (h1) and the point (c1) approach the ground. When the difference [(A1)-(B)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hit ball, and the directionality and the distance characteristic are deteriorated. The difference [(A1)-(B)] is preferably greater than 0 mm, more preferably greater than 1 mm, and even more preferably greater than 2 mm from the viewpoint of improving the swing-out by suppressing contact on the heel side during the stroke. 3.5 mm or more is particularly preferable. The difference [(A1)-(B)] is preferably 15 mm or less, and more preferably 9.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  When the difference [(A2)-(B)] is excessively large, the degree of freedom in the inclination angle of the head in the toe-heel direction is large in the second half of the hit ball. A golfer easily tilts the head in the toe-heel direction due to the degree of freedom.

  In the second half of the hit ball, the point (t1) and the point (c1) approach the ground. When the difference [(A2)-(B)] is excessively large, the head tends to tilt in the toe-heel direction in the second half of the hit ball, and the directionality and the distance characteristic are deteriorated. The difference [(A2) − (B)] is preferably greater than 0 mm, more preferably greater than 1 mm, and even more preferably greater than 2 mm from the viewpoint of improving the swing-out by suppressing the contact on the toe side during the stroke. 3.5 mm or more is particularly preferable. The difference [(A2)-(B)] is preferably 15 mm or less, and more preferably 9.5 mm or less from the viewpoint of improving sitting and suppressing the inclination in the toe-heel direction in the second half of the hit ball.

  From the viewpoint of improving sitting, a straight line connecting the point (c3) and the point (c4) is preferably included in the lower surface of the head 2.

  In FIG. 4, what is indicated by a double arrow L1 is the maximum width of the head in the toe-heel direction. From the viewpoint of improving sitting and increasing the moment of inertia of the head to improve the directionality, the width L1 is preferably 70 mm or more, more preferably 80 mm or more, and particularly preferably 90 mm or more. If the head weight becomes excessively large, the swing-out becomes worse and it becomes difficult to finely adjust the hitting speed, so that the directionality and the distance characteristic are lowered. From the viewpoint of improving swinging and suppressing an excessive increase in weight, the width L1 is preferably equal to or less than 150 mm, more preferably equal to or less than 130 mm, and particularly preferably equal to or less than 110 mm.

  In FIG. 4, what is indicated by a double-headed arrow L3 is the maximum width of the head in the face-back direction. From the viewpoint of improving sitting and increasing the moment of inertia of the head to enhance the directionality, the width L3 is preferably 60 mm or more, more preferably 70 mm or more, and particularly preferably 80 mm or more. From the viewpoint of improving swinging and suppressing an excessive increase in weight, the width L3 is preferably equal to or less than 140 mm, more preferably equal to or less than 120 mm, and particularly preferably equal to or less than 100 mm.

  In FIG. 4, what is indicated by a double-headed arrow L4 is the length in the face-back direction from the point (c1) to the point (c4). When the length L4 is excessively small, the degree of freedom of inclination in the toe / heel direction in the second half of the hit ball is increased. From the viewpoint of suppressing the inclination of the toe-heel direction in the latter half of the hit ball and increasing the completion moment to increase the directionality, the length L4 is preferably 40 mm or more, more preferably 50 mm or more, and particularly preferably 60 mm or more. From the viewpoint of improving swinging and suppressing excessive weight increase, the width L4 is preferably equal to or less than 120 mm, more preferably equal to or less than 100 mm, and particularly preferably equal to or less than 80 mm.

  In FIG. 4, what is indicated by a double-headed arrow L5 is the length in the face-back direction from the back surface 14 of the face portion to the point (c4). From the viewpoint of improving sitting, the length L5 is preferably 3 mm or more, and more preferably 5 mm or more. From the viewpoint of improving swinging and suppressing excessive weight increase, the width L5 is preferably 20 mm or less, more preferably 15 mm or less, and particularly preferably 10 mm or less.

  In FIG. 4, the double arrow L0 indicates the toe-heel direction length from the point (c4) to the point (h5). This length L0 is also the toe-heel direction length from the point (c4) to the point (t5). From the viewpoint of improving sitting and increasing the moment of inertia of the head to improve the directionality, the width L0 is preferably 25 mm or more, more preferably 30 mm or more, and particularly preferably 35 mm or more. From the viewpoint of improving swing-out and suppressing excessive weight increase, the width L0 is preferably 90 mm or less, more preferably 70 mm or less, and particularly preferably 50 mm or less.

  In FIG. 8, what is indicated by a double-headed arrow θ is an angle formed by a straight line Ls perpendicular to the reference ground plane s and a straight line Lc connecting the point (c5) and the face center fc. The angle θ is a loft angle with respect to the reference ground plane s. When the angle θ is small, the loft angle with respect to the vertical direction tends to be negative in impact. Due to this negative loft angle, an impact is made with the ball pressed against the ground. This impact hinders smooth rolling, hinders smooth strokes, and deteriorates distance and directionality. From the viewpoint of suppressing an excessively small loft angle with respect to the vertical direction in impact, the angle θ is preferably 0 degree or more, more preferably 1 degree or more, and particularly preferably 2 degrees or more. If the angle θ is too large, the ball will bounce, etc., and smooth rolling cannot be obtained, resulting in a decrease in distance and directionality. In terms of impact, from the viewpoint of suppressing an excessively large loft angle with respect to the vertical direction, the angle θ is preferably 8 degrees or less, more preferably 6 degrees or less, and particularly preferably 5 degrees or less.

  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]
The head shown in FIGS. 1 to 8 was obtained in the same manner as the head 2 of the above embodiment. H (h1) and H (t1) were 4 mm. H (h2) and H (t2) were 2 mm. H (h3) and H (t3) were set to 1.3 mm. H (h4) and H (t4) were 0.6 mm. H (h5) and H (t5) were set to 1 mm. A shaft and a grip were attached to this head to obtain a putter type golf club of Example 1. The specifications such as the dimensions of the head of Example 1 including the height at each point on the lower surface of Example 1 are shown in Table 1 below. The evaluation results of Example 1 are also shown in Table 1 below.

[Examples 2 to 5 and Comparative Example 1]
The putter type golf clubs of Examples 2 to 5 and Comparative Example 1 were obtained in the same manner as in Example 1 except that the head specifications were as shown in Table 1 below.

  As described in Table 1, in all examples and comparative examples, H (h1) and H (t1) are the same, H (h2) and H (t2) are the same, and H (H3) and H (t3) are the same, H (h4) and H (t4) are the same, and H (h5) and H (t5) are the same.

[sensory evaluation]
The evaluation was made by 10 golfers with handicap between 2 and 17. Each golfer put on a cup 8m ahead. Each golfer put on 10 times at each club. Each golfer made a sensory evaluation on the goodness of sitting and the ease of swinging in five stages. The sensory evaluation score was from 1 to 5 points. The higher the score, the higher the evaluation. Average values for all golfers are shown in Table 1 below.

[Number of catches]
Of all the golfers' hits (100 times in total), the number of contact between the head and the ground during the stroke is shown in Table 1 below as the “number of catches”.

[Distance shift]
The distance between the ball stop position and the center of the cup was measured at the hit of all golfers (100 times in total). This average value is shown in Table 1 below as “distance shift”.

  As shown in Table 1, the examples have higher evaluations than the comparative examples. From this evaluation result, the superiority of the present invention is clear.

  The present invention can be applied to any putter type golf club and its head.

FIG. 1 is a plan view of a head of a putter type golf club according to an embodiment of the present invention. FIG. 2 is a side view of the head of FIG. FIG. 3 is a front view of the head of FIG. FIG. 4 is a bottom view of the head of FIG. FIG. 5 is a bottom view of the head of FIG. 6 is a cross-sectional view of the head of FIG. 1 taken along the line VI-VI. FIG. 7 is a cross-sectional view of the head of FIG. 1 taken along line VII-VII. FIG. 8 is a sectional view taken along line VIII-VIII of the head of FIG.

Explanation of symbols

2 ... head 4 ... face portion 6 ... back portion 8 ... toe connection portion 10 ... heel connection portion 12 ... face surface 14 ... back surface of face portion fc ... face Center L ・ ・ ・ Leading edge s ・ ・ ・ Reference ground plane

Claims (1)

A face portion having a face surface;
A back portion extending rearward from the center portion of the face portion;
A toe link extending from the toe side of the face part to the back of the back part;
A heel connecting part extending from the heel side of the face part to the back of the back part,
A head of a putter type golf club in which the height H from the reference ground contact surface at each point on the lower surface of the head satisfies the following (a) to (g).
(A) The height H (c1) at the point c1 is equal to or higher than the height H (c4) at the point c4.
(B) The height H (h1) at the point h1 is higher than the height H (h5) at the point h5.
(C) The height H (t1) at the point t1 is higher than the height H (t5) at the point t5.
(D) The height H (h5) at the point h5 is greater than or equal to the height H (c4) at the point c4.
(E) The height H (t5) at the point t5 is greater than or equal to the height H (c4) at the point c4.
(F) [H (h1) -H (h5)] is larger than [H (c1) -H (c4)].
(G) [H (t1) -H (t5)] is larger than [H (c1) -H (c4)].
However,
The point (h1) is the center point in the face-back direction of the heel connection part at the connection part with the back part,
The point (t1) is the center point in the face-back direction of the toe connection part at the connection part with the back part,
The position in the face-back direction of the point (c1) is the same as the point (h1) and the point (t1),
The position in the face-back direction of the point (c4), the point (h5), and the point (t5) is a position separated by 5 mm from the leading edge center point,
The toe and heel direction positions of the point (c1) and the point (c4) are the same as the face center,
The toe-heel direction position of the point (h5) is the center position in the toe-heel direction of the heel connection part at the connection part with the face part,
The position in the toe / heel direction at the point (t5) is the center position in the toe / heel direction of the toe connection part at the connection part with the face part.

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