JP2005007160A - Golf putter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf putter which is stabilized in a face direction upon ball hitting to reduce deviation of a hitting direction. <P>SOLUTION: In this golf putter, a neck 8 has a structure extended curved in a ball hitting direction on a face part 2 of a putter head 10, and a shaft 22 has a structure set away from the hitting direction by a distance L between the cross point a with the face 2a and the cross point b with the shaft axis line 20 on the centroidal line 21 and a distance R from the center of gravity G to the cross point b with the shaft axis line 20 on the centroidal line 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a golf putter (hereinafter abbreviated as a putter).

  The function of the putter is to hit the ball so as to cup in with fewer hits on the green. Therefore, the characteristic required for the putter is that the ball can be easily launched in the target direction.

Currently, most putters have a shaft attached to a hosel formed at or near the heel end of the putter head. Further, the hosel extends upward from the head, or is formed so as to extend upward after being offset forward.
The hitting center or sweet spot of the head of the putter is at the intersection with the face surface of the barycentric line which is a line passing through the barycenter of the head and perpendicular to the face. Accordingly, when the ball is hit with the sweet spot removed (offset hitting), the head rotates due to the inertial force and the face direction changes, so that the ball rolls off the intended direction.

  Therefore, as a solution, a putter has been proposed in which the mass is concentrated on the heel and toe of the putter head to increase the moment of inertia of the putter head and the face balance. In the face-balanced putter, the axis of the shaft crosses a line extending through the center of gravity of the putter head or perpendicularly to the face through the center of gravity of the putter head. Can be improved.

For example, as disclosed in Japanese Patent Application Laid-Open No. 6-190093, the mass of the putter head is concentrated at the toe and heel portions, and the center of gravity is positioned at the approximate center of the toe and heel of the putter head. It is disclosed that the shaft is positioned such that the longitudinal axis of the putter shaft extends perpendicularly to the putter face and passes through the center of gravity and intersects at a point in front of the putter face.
Therefore, face balance (the shaft axis passes through the center of gravity and intersects with the virtual axis extending in the vertical direction of the face and intersects the front of the face) and the mass is concentrated on the toe and heel, so The moment of inertia is increased, and the rotation of the putter head during offset hitting can be suppressed.
JP-A-6-190093

The face-balanced putter is a condition for preventing the head from rotating when the shaft is translated without applying rotational force around the shaft axis, and greatly improves the stability of the face surface direction during the putter stroke. Contribute.
However, if a rotational force is applied to the shaft shaft, the head will naturally rotate and the face surface direction will be out of order.

Also, increasing the moment of inertia about the shaft axis is very important for the putter. The larger this is, the smaller the angular velocity that rotates around the shaft axis with respect to the rotational force applied to the shaft. In other words, it is an important factor for the stability of the putter head.
However, when the rotation is once stopped around the shaft axis and then the rotation is to be stopped, the force required to stop the rotation is increased in proportion to the moment of inertia around the shaft axis. That is, once the putter with a large moment of inertia around the shaft axis is rotated around the shaft axis, the control becomes ineffective and a large deviation occurs in the face surface direction.

Also, in the actual putting stroke, after addressing (preparing) the face surface to be perpendicular to the direction of the hit ball, the player should be careful not to rotate the shaft axis (do not change the face direction). Is moving. And, if it is rotated around the shaft axis contrary to the intention, a delicate correction is made before hitting the ball.
If the player is an advanced player and can hit the ball with zero or very little rotational force, he / she has face balance and a large moment of inertia around the shaft axis. If it is a putter head, there is no problem. However, a general player often rotates unstablely around the shaft axis during a stroke. In that case, it is necessary to make corrections before hitting the ball. However, no solution has been made for the ease of the correction.

  Further, when hitting with a putter, the contact time between the ball and the face surface is longer than that of an iron or driver, and the movement is different. In the case of an iron or driver, it can be approximated to the state where the ball's striking force is applied to the head alone, but in the case of a putter, the force applied by the player in the moving direction, the inertial force of the head, the inertial force of the ball, It is thought that the person will be in a balanced state. Therefore, how much the face direction is separated from the moving direction (target direction) in a state where the forces of the three parties are balanced is an important factor for determining the directionality. In this regard, no solution has been made so far.

  Accordingly, an object of the present invention is to provide a golf putter that solves the above problems and stabilizes the face surface direction at the time of stroke and at the time of hitting, thereby reducing the deviation of the hitting direction.

  In order to achieve the above object, a golf putter according to claim 1 of the present invention includes a putter head and a shaft, and the putter head includes a hosel portion that connects a head body and the shaft, A golf putter having a structure in which a center of gravity line passing through the center of gravity and extending perpendicularly to the face surface (in the direction of the hitting ball) and the shaft axis of the shaft intersects in front of the face surface, and an intersection point a with the face surface on the center of gravity line The distance L between the intersection b of the center of gravity line and the shaft axis is 30 mm to 120 mm, and the distance R between the center of gravity and the intersection b of the shaft axis on the center line is 35 mm to 200 mm. The golf putter is characterized.

  A golf putter according to a second aspect of the present invention is the golf putter according to the first aspect, wherein the sole of the putter head is placed on a flat ground and is stationary in a state where a ball is prepared (putting of the putting). In the shape in which the putter head is projected perpendicularly to the ground in the address state), the center line of the neck of the putter head is a straight line that passes through the center of gravity G and extends perpendicularly to the face surface (in the hitting direction) and overlaps the center of gravity line. In addition, the golf putter is characterized in that the face surface and the shaft axis are perpendicular to the centerline of the neck.

  A golf putter according to a third aspect of the present invention is the golf putter according to the first aspect, wherein the sole of the putter head is placed along a flat ground and is stationary in a state where a ball is prepared (putting of the putting). In the shape in which the putter head is projected perpendicularly to the ground in the address state), the center line of the neck of the putter head passes through the center of gravity G and is parallel to the center of gravity line extending perpendicularly to the face surface (direction of hitting ball). The golf putter is characterized in that the face surface and the shaft axis are perpendicular to the centerline of the neck.

  As described above, the golf putter of the present invention has a structure in which the center of gravity passing through the center of gravity of the putter head and extending perpendicularly to the face surface (in the direction of the hit ball) intersects the shaft axis of the shaft in front of the face surface. The distance L between the intersection point a of the face surface and the intersection point b of the shaft axis on the centroid line is 30 mm to 120 mm, and the distance between the centroid and the intersection point b of the shaft axis on the centroid line Since R is formed from 35 mm to 200 mm, the player can easily imagine a swing. Further, the stability of the face surface at the time of swinging can be obtained without impairing the goodness that does not cause a sense of incongruity during the stroke, and the face surface can be surely directed in the cup direction at the time of hitting (immediately before). Further, even when the hitting ball position is shifted, the rotation of the head can be suppressed and the stability in the hitting ball direction can be obtained.

  In addition, the shape of the putter head is projected vertically onto the ground with the sole of the putter head along the flat ground and resting in a ready state for the hitting ball (putting address state). In the contour shape of the putter as viewed from directly above, the center line of the neck passes through the center of gravity G and overlaps the center of gravity line extending perpendicularly to the face surface (in the direction of the hitting ball), and can be used as an aiming line in the hitting direction.

  Further, in the state where the sole of the putter head 10 is placed on a flat ground and is stationary in a state where the ball is prepared (putting address state), the shape of the putter head is projected vertically on the ground (the player In the shape of the putter as viewed from directly above the ground surface at the time of addressing, the eight center lines 8a of the neck pass through the center of gravity G and are parallel to the center of gravity line 21 extending perpendicularly (in the direction of the hit ball) to the face surface 2a. A pattern in which the neck line is parallel to the hitting direction and is displaced from the ball can also be used as the aiming line in the hitting direction.

  This aiming line is longer than the normal putter and automatically crosses the center of the ball when viewed from directly above, which is very effective as an aiming line. In addition, the neck and shaft appear to intersect two straight lines at right angles when viewed from directly above. Therefore, since the straight line of the face surface and the straight line of the shaft axis parallel to this are perpendicular to the center line (straight line) of the neck when viewed from directly above, the three lines are simple and have no curves. Since all the marks are in the direction of the hit ball, it is possible to address accurately.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
1 is an overall perspective view illustrating a putter according to the present invention, FIG. 2 is an explanatory view of the putter head viewed from the side, and FIG. 3 is an explanatory view of the putter head viewed from directly above the ground at the time of addressing by the player. FIG. 4 is an explanatory view showing another embodiment. Moreover, FIGS. 5-8 is the figure which demonstrated the putter of this invention dynamically.

  As shown in FIG. 1, the putter 30 in the present embodiment has a configuration in which a head body 1, a hosel portion 3, and a shaft 11 are connected to the hosel portion 3. A grip (not shown) is attached. Known shafts and grips can be used.

The head body 1 is made of a composite material of a metal other than a metal such as a metal such as stainless steel or a titanium alloy, or a resin, and a substantially flat face portion 2, and a lower portion of the face portion 2. A sole portion 4, a heel 5, and a toe 6.
A neck 8 is formed on the central portion 7 a of the upper end surface 7 of the face portion 2 of the head body 1 so as to rise from the upper end surface 7. A hosel portion 3 is provided on the upper end of the neck 8. As a result, the putter head 10 is formed.

  Further, the face portion 2 may be made of only metal, but may be made of a composite material of a material other than metal such as resin and metal. For example, it is conceivable that a resin part is fitted into the central portion of the face surface 2a and the central portion of the face surface 2a is made of resin.

  In the present embodiment, weight portions 9a and 9b are formed on the heel 5 side and the toe 6 side on the rear side of the face portion 2 of the putter head 10, and the weight portions 9a and 9b are formed on the sole portion 4. It extends from the top to the rear and from the face part 2 to the rear.

  Note that the center of gravity of the putter head 10 is indicated by a point G, and in the present embodiment, is above the center portion of the sole portion 4 on the back side of the face portion 2.

  In the putter 30 according to the present invention, the center line of the hosel portion 3 and the shaft 11, that is, the shaft axis line 20, passes through the center of gravity G of the putter head and extends to the face surface (perpendicular direction). The crossing is made at a point b in front of the face surface 2a.

Next, as shown in FIG. 2, the neck 8 has a configuration extending in a hitting direction with respect to the face portion 2 of the putter head 10. Accordingly, the shaft axis 22 has a distance L between the intersection point a between the face surface 2 a and the intersection point b between the shaft axis 20 on the center line 21 and the center axis G to the shaft axis line 20 on the center line 21. It is comprised so that it may leave | separated in the hit ball direction by the distance R with the intersection b.
That is, the putter 30 of the present invention has a distance L between the intersection point a between the face surface 2 a and the intersection point b between the shaft axis 20 on the center line 21 and the shaft axis 20 from the center G on the center line 21. The feature is that both the distances R to the intersections b are long.

  Also, as shown in FIG. 3, the putter head shape is projected vertically onto the ground in a state where the sole of the putter head 10 is placed on a flat ground and is stationary in the state where the ball is ready (putting address state). The center line 8a of the neck 8 overlaps with the center of gravity line 21 passing through the center of gravity G and extending perpendicularly to the face surface 2a (in the direction of the hit ball). , It can be an aiming line in the hitting direction. This aiming line is longer than the normal putter and automatically crosses the center of the ball 40 when viewed from directly above, which is very effective as an aiming line.

  As another embodiment, as shown in FIG. 4, the putter head shape is set in a state where the sole of the putter head 10 is placed on a flat ground and is stationary in a state where the ball is ready (putting address state). In the shape vertically projected onto the ground (the contour shape of the putter as viewed from directly above the ground at the time of addressing by the player), the eight center lines 8a of the neck pass through the center of gravity G and are perpendicular to the face surface 2a (the direction of the hit ball) It is also possible to make it parallel to the barycentric line 21 extending to). By making them parallel, the pattern in which the neck line is parallel to the hitting direction and is displaced from the ball can be sufficiently set as the aiming line in the hitting direction.

  Therefore, the neck 8 and the shaft 11 shown in FIGS. 3 and 4 appear to have two straight lines intersecting at right angles when viewed from directly above. Therefore, since the straight line of the face surface 2a and the shaft axis 20 parallel to the face surface 2a are perpendicular to the neck center line 8a (straight line) when viewed from directly above, the three lines are not curved and simple. Since all the marks are in the direction of the hit ball, it is possible to address accurately.

  In the putter head of the present embodiment, the sweet spot is located at the intersection point a with the face surface 2a on the center of gravity line 21 that passes through the center of gravity G of the putter head and extends perpendicularly to the face surface (in the hit ball direction).

The putter configured as described above can provide the following dynamic effects.
As shown in FIG. 5, if it is possible to hit the ball with the rotation around the shaft axis 22 being zero or with a very small rotational force, the face surface is perpendicular to the shaft axis during the stroke (hitting direction). The force F is applied, and the inertia force F in the reverse direction is applied to the center of gravity of the head as the reaction force. In this case, the ball can be launched in the shaft moving direction without changing the face surface direction.

Next, consider the case where rotation occurs around the shaft axis.
As shown in FIG. 6, a rotational moment is applied to the shaft 22 in the direction in which the center of gravity G overlaps the shaft traveling direction due to the inertial force of the center of gravity of the head. That is, a force to reverse the rotation around the shaft shaft 22 against the intention is applied. If the player applies a force of F in the shaft moving direction and rotates theta counterclockwise around the shaft axis, a moment of “F × Rsinθ” occurs, and the rotation of θ (the deviation in the face direction) A rotational force is automatically applied in the direction of returning to the original direction. It is easier to correct unintentional rotation as the moment “F × Rsinθ” is larger. Therefore, when θ and F are constant, it can be seen that the larger the distance R from the center of gravity G to the intersection b with the shaft axis 20 on the center of gravity line 21, the easier it is to correct.

Next, consider the moment of hitting the ball.
As described in the above-mentioned prior art, when the ball is hit with a putter, the contact time between the ball and the face surface is longer than that of the iron and driver, so that the force F + ω applied by the player in the moving direction as shown in FIG. It is considered that the inertial force F of the head and the inertial force ω of the ball are in a balanced state of these three.
When the ball 40 is hit at a position away from the sweet spot by the distance S, the force applied from the ball 30 to the face by the inertial force is ω.
As shown in FIG. 8, at the moment when the face surface and the ball come into contact, a moment of “ω × S” is applied around the shaft axis, and the shaft axis 22 rotates counterclockwise. As the rotation proceeds, a moment due to the inertial force of the head is generated, and eventually these are balanced at a certain angle θ ′.
Therefore, since the algebraic sum of the moment of force at this time becomes 0,

が成り立つ。実際θ’は小さいから、cosθ’＝１、sinθ’＝θ’と近似すると、

Holds. Since θ ′ is actually small, approximating cos θ ′ = 1 and sin θ ′ = θ ′

となる。

It becomes.

Therefore, when F, ω, and S are constant, it can be seen that R and L may be increased to reduce θ ′, which is a deviation in the hitting direction.
That is, the distance L between the intersection point a of the face surface 2a and the intersection point b of the shaft axis line 20 on the barycentric line 21 and the barycentric line G on the barycentric line 21 from the barycentric line G, which are features of the putter of the present invention. It can be seen that the fact that the distance R to the intersection b with 20 is both long satisfies the true condition of reducing the deviation in the hitting direction.

  The distance L between the intersection point a between the face surface 2a and the intersection point b between the shaft axis 20 on the center line 21 and the distance between the intersection point b between the center G and the shaft axis 20 on the center line 21. As for the distance R, it can be said that the distance L is preferably 30 mm to 120 mm, and the distance R is preferably 35 mm to 200 mm.

  If the distance L is less than 30 mm, when the ball is hit at a position away from the sweet spot 20, the angle at which the head rotates increases, and the variation in the rolling direction of the ball may increase. On the other hand, if it exceeds 120 mm, the directional stability is improved, but when the player holds it, the face surface becomes considerably rearward, and it is difficult to aim at the cup. In addition, the player will be struck much later than the player's own hitting image, which makes the swing special and difficult.

  If the distance R is less than 35 mm, the rotational force automatically applied in the direction of returning to the original direction becomes weak when the face surface is deviated during the swing stroke. It will not be easy for the player. Furthermore, when the ball is hit at a position away from the sweet spot 20, the rotation of the head becomes large, and the hitting direction is likely to be incorrect. On the other hand, if it exceeds 200 mm, it is necessary to construct an object substantially behind the head body, and the back part of the head contacts the ground during a stroke, which hinders the swing. In addition, problems such as difficulty in storing in the caddy bag occur.

The whole perspective view explaining the putter of the present invention. Explanatory drawing which looked at the putter head from the side. Explanatory drawing which looked at the putter head from right above the ground at the time of a player's address. Explanatory drawing which shows another Example. The figure which demonstrated the putter of this invention dynamically. The figure which demonstrated the putter of this invention dynamically. The figure which demonstrated the putter of this invention dynamically. The figure which demonstrated the putter of this invention dynamically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head body 2 Face part 2a Face surface 4 Hosel part 5 Heel 6 Toe 7 Upper end surface 7a Center part 8 Neck 8a Center line 9a Weight part 9b Weight part 10 Putter head 11 Shaft 20 Shaft axis line 21 Center of gravity line 22 Shaft axis 30 Putter 40 ball

Claims (3)

  The putter head comprises a putter head and a shaft, and the putter head includes a hosel part for connecting the head body and the shaft, passes through the center of gravity of the putter head and extends perpendicularly to the face surface (in the hitting direction), and the shaft axis of the shaft Is a golf putter having a structure that intersects in front of the face surface, and a distance L between an intersection point a of the face surface on the centroid line and an intersection point b of the centroid line and the shaft axis is 30 mm to 120 mm, A golf putter characterized in that the distance R between the center of gravity and the intersection b with the shaft axis on the center of gravity line is 35 mm to 200 mm.   When the sole of the putter head is placed on a flat ground and is resting in a state where it is ready for hitting (putting address state), the putter head is projected vertically onto the ground, and the neck of the putter head is Is a straight line that passes through the center of gravity G and extends perpendicularly to the face surface (in the direction of the hit ball) and overlaps the center of gravity line, and the face surface and the shaft axis line are perpendicular to the center line of the neck. The golf putter according to claim 1. When the sole of the putter head is placed on a flat ground and is resting in a state where it is ready for hitting (putting address state), the putter head is projected vertically onto the ground, and the neck of the putter head is The center line of the head is parallel to the center of gravity line passing through the center of gravity G and extending perpendicularly to the face surface (in the direction of the hit ball), and the face surface and the shaft axis line are perpendicular to the center line of the neck. Item 2. A golf putter according to Item 1.

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