JP2006333985A - Mallet golf stick - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mallet golf stick which is easier to swing and achieves a yardage obtainable as desired by setting the center of gravity and the axial line of a shaft at the optimum positions. <P>SOLUTION: The mallet golf stick 1 is has a shaft 5 while being provided with a shaft mounting part 12 for mounting the tip of the shaft 5 on it and a cylindrical head 10 which has a striking surface 10a at least at its one end part. The shaft mounting part 12 is disposed on the side of the striking surface 10a at one end part from its center in the length of the head so that the center of gravity G of the head 10 is positioned between the shaft mounting part 12 and the striking surface 10a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mallet golf stick, and more particularly to a mallet golf stick characterized by a head portion.

  Conventionally, there is a sport called mallet golf, and it is actively performed especially in an area where the natural environment is rich. Mallet golf is a sport in which a golf element is added to a so-called gate ball, and the equipment to be used (Mallet golf stick) is determined within a certain rule. For example, Patent Document 1 and Patent Document 2 As disclosed, it is constituted by a shaft and a cylindrical head attached to the tip of the shaft.

  The former mallet golf stick has a structure in which the bottom surface of the head is bent in a substantially arc shape in a side view, and an extension line extending downward from the shaft passes through a front position with a striking surface rather than a center position in the longitudinal direction of the head. ing. According to the mallet golf stick having such a structure, it is possible to prevent the ground from rubbing against the vertical movement at the time of swing and the unevenness of the ground due to the arc shape of the bottom surface portion. Further, the latter mallet golf stick has a so-called bullet shape in which the rear side of the striking surface is reduced in a taper shape, and is configured to improve the omission after hitting.

Since the above-described mallet golf stick uses a dedicated ball having a larger diameter and a larger weight than the golf ball, it is desirable to increase the weight of the head in order to easily fly the large-diameter ball. There is a limit to increasing the diameter of the shape head, and no technical idea has been proposed to adjust the position of the center of gravity of the head according to the length in the left-right direction without extending the head.
JP-A-8-168543 JP 2002-204843 A

  As described above, the conventional mallet golf stick does not have the idea of adjusting the position of the center of gravity of the head. Therefore, there is a problem that the flight distance of the ball does not increase depending on the deflection of the shaft during the swing.

  That is, when playing, first, after aligning the ball striking surface with the ball, determine the stance so that the shaft is at the center of the left and right of the body, enter the back swing with the head floating from the ground, reach the predetermined height Move down and hit the ball. At this time, if the shaft is fixed at the center position in the longitudinal direction of the cylindrical head and the position of the center of gravity substantially coincides with the axis of the shaft, the shaft is not bent so much at the time of hitting. However, as in Patent Document 1, in the structure in which the extended line extending downward from the shaft passes through the front position with the striking surface rather than the center position in the longitudinal direction of the head, the shaft bends in the direction of the ball when the ball is hit, Along with this, the hitting surface of the head faces upward, the rear part of the head comes into contact with the ground, and the distance over which the ball rolls is deviated.

  Further, if the rear part is greatly warped according to Patent Document 1 or if the rear part is greatly reduced in diameter according to Patent Document 2, the weight of the rear part is reduced to compensate for the weight of hitting a large ball. There is a problem that the center of gravity is located further rearward, the head is likely to shake, and the swing is difficult to stabilize.

  The present invention has been made by paying attention to the above-described problems, and provides a mallet golf stick that is easy to swing by obtaining a desired flight distance by setting the center of gravity of the head and the shaft axis to the optimum positions. The purpose is to do.

  In order to solve the above-described problems, a mallet golf stick according to the present invention includes a shaft, and a cylindrical head having a shaft mounting portion to which the tip of the shaft is attached and having a striking surface at least at one end. The mallet golf stick having the shaft mounting portion is provided on the striking surface side of the one end portion with respect to the longitudinal center of the head, and the center of gravity of the head is between the shaft mounting portion and the striking surface. It is located in.

  According to such a mallet golf stick, the center of gravity of the head is positioned closer to the striking surface than the shaft mounting portion, so that contact with the ground behind the head due to bending of the shaft can be prevented, and the ball can be accurately moved. You can hit the ball. In addition, swing-out performance when swinging is improved.

  According to the present invention, it is possible to obtain a mallet golf stick having a desired flight distance and easy to swing.

  1 and 2 are views showing an embodiment of a mallet golf stick according to the present invention, FIG. 1 is a side view showing the overall configuration, and FIG. 2 is a sectional view of a head portion.

  The mallet golf stick 1 includes a shaft 5 and a cylindrical head 10 attached to the tip of the shaft 5. The shaft 5 is formed of metal, carbon fiber reinforced resin, or the like. Is formed of a metal member such as aluminum. A grip 7 having a predetermined length is attached to the proximal end side of the shaft 5, and the distal end side of the shaft 5 is inserted into a fixing hole 12 a of a shaft attachment member 12 attached to the head 10 and bonded thereto. It is attached and fixed to the head 10 by being equalized.

  The head 10 is formed in a cylindrical shape, and a hollow portion 13 is formed therein. A holding hole 15 into which the shaft attachment member 12 is inserted is formed on the upper surface side of the head 10 defining the hollow portion, and the tip of the shaft attachment member 12 is inserted on the lower surface side defining the hollow portion. A recessed portion (hole) 16 to be fixed is formed. A step portion 15a is formed in the upper portion of the holding hole 15, and a protrusion 12b formed on the outer periphery of the shaft mounting member 12 is abutted and positioned and fixed thereto. Further, a step portion 12c is formed on the lower side of the fixing hole 12a of the shaft mounting member 12, and the tip end of the shaft 5 to be inserted is applied to fix the positioning.

  As described above, the shaft attachment member 12 is passed through and fixed to the upper surface side of the head 10, and the tip portion of the shaft is inserted into and fixed to the concave portion 16 formed on the lower surface side, so that the head of the shaft 5 to be mounted thereon. It is possible to improve the mounting strength with respect to. Further, the step portion 12c of the shaft mounting member 12 is formed at a position that does not reach the concave portion 16 of the head 10, so that the insertion end with respect to the concave portion 16 can be made thicker, and the mounting strength can be further increased. It becomes possible to improve.

  The shaft mounting member 12 and the head 5 are fixed by an adhesive, or a male screw portion 12d is formed on the outer periphery of the shaft mounting member 12, and this is formed into a female screw 15b formed in the holding hole 15 of the head. It may be configured to be screwed together. Or it becomes possible to improve attachment strength more by fixing by both means of screwing and adhesion. Moreover, it is preferable that the mounting position of the shaft mounting member 12 with respect to the head 10 is on the large-diameter striking surface side described later than the center in the longitudinal direction.

  The striking surface 10a formed at one end of the cylindrically formed head 10 may be integrally formed by the material of the head 10 itself, but as shown in the figure, it is repulsive to the ball. For example, the end surface 10a of the lid-like striking member 20 formed of a more preferable material may be used. In this case, the striking member 20 is made of titanium, titanium alloy, stainless steel, aluminum alloy such as duralumin, or the like, and is screwed and / or bonded to the opening formed at the end of the head 10. It is fixed. An inner space 20a is formed inside. Note that the striking member 20 and the head 10 are formed so that the surfaces of both of them are flush.

  The striking surface 10a has a plane perpendicular to the target line in the direction of striking and rolling the ball. For example, the striking surface 10a may be formed by an uneven surface or an inclined surface facing upward.

  As described above, the head 10 is formed in a cylindrical shape. By being formed into a cylindrical shape in this way, the ridge line visually recognized when the club is gripped and addressed is formed so as to be substantially orthogonal to the striking surface 10a (or substantially parallel to the target line). It is easy to follow the target direction. In this case, it is preferable that the ridge line to be visually recognized is in a direction that is exactly perpendicular to the striking surface 10a (or exactly parallel to the target line), but there is no sense of incompatibility when addressing. It may be tilted to the extent that it can be aligned in the target direction (preferably within ± 5 °).

  In the present embodiment, the striking surface 10b for actually hitting the ball is formed on the end surface opposite to the striking surface 10a. The striking surface 10b is formed by an end surface of a striking member 30 different from the head 10 like the above-described striking surface 10a, and is screwed and / or opened with an opening formed at the end of the head 10. Or it is fixed by adhesion. An inner space 30a is formed inside. Note that the striking member 30 and the head 10 are formed so that the surfaces of both of them are flush.

Next, the dimensional relationship of the head 10 will be described.
The striking surface 10a is formed with a diameter D of 50 mm and an axial length L of the head 10 in the range of 120 mm to 240 mm (125 mm in this embodiment). The mounting position of the shaft 5 with respect to the head is formed such that the length L1 from the shaft axis P to the striking surface 10a is 55 mm, and the length L2 to the rear end surface is 70 mm.

  Further, the thickness T1 from the striking surface 10a of the striking member 20 to the inner space 20a is 10 mm, and the thickness T2 from the striking surface 10b of the striking member 30 to the inner space 30a is 6 mm.

  The striking member 20 and the striking member 30 are formed such that the thickness T1 is thicker than the thickness T2, and the position of the center of gravity G of the head 10 is biased toward the striking surface 10a, and the shaft axis P and the striking surface 10a It is set to be in between.

  Further, the striking member 20 and the striking member 30 have the same thickness T1 and T2, and appropriately select materials having different specific gravities such as titanium, titanium alloy, stainless steel, duralumin and other aluminum alloys, and have a large specific gravity. By forming the striking member 20 with a material, the position of the center of gravity G may be set so as to be located between the shaft axis P and the striking surface 10a.

  However, it is preferable to adjust so that the material and external dimensions of the striking member 20 and the striking member 30 are substantially the same.

  The shaft 5 has a diameter gradually reduced from the upper part to the lower part, and in order to ensure the required strength, sheet-shaped prepregs that have been cut into various shapes according to the reinforcement specifications at any part are cored. It is preferably made of a fiber reinforced resin which is wound around and heat-cured according to a conventional method.

  When formed with a fiber reinforced resin, it can be easily bent, and can be efficiently struck and can be hit easily. In addition, the bending condition of the shaft can be easily set by stacking more reinforcing fibers in the longitudinal direction than in the circumferential direction of the shaft.

According to the mallet golf stick configured as described above, the following functions and effects can be obtained.
By shifting the mounting position of the shaft to the head toward the striking surface 10a, when addressing, it becomes easier to hit the ball near the center of the body, the directionality is stabilized, and head blurring is less likely to occur. This makes it easier to hit the ball in the direction of the hit ball.

  Further, by shifting the gravity center position G on the striking face 10a side and the shaft axis line, it is possible to improve the distance of the ball at the time of hitting due to the bending of the shaft. Specifically, as shown in FIG. 3A, if a stance is determined with respect to the ball B so that a ball can be hit when the shaft axis P of the shaft 5 is at the center of the left and right of the body, the ball striking surface 10a. Is perpendicular to the ground surface J, it is easy to hit in the hitting direction. From here, the head enters the backswing with the head floating from the ground J, reaches a predetermined height, moves to the downswing, and hits the ball B. However, as shown in FIG. 3B, when the ball B is hit, the shaft 5 bends in the hitting direction, but the center of gravity G is located between the shaft axis P and the striking surface 10a. Since the axis P and the center of gravity G are bent so that they intersect, the head 10 is hit with the head tilted by θ with respect to the vertical direction of the ground J, and the back of the head 10 is separated from the ground J and comes into contact. Since it becomes difficult, it is possible to fly the ball B accurately at a desired distance.

  Further, since the ball is hit with the striking surface 10a inclined from above the ball B, it is difficult to cause the ball B to rotate in the reverse direction, and the flight distance can be further increased.

  Further, even if a cylindrical head having the same diameter is used, the back of the head is less likely to come into contact with the ground and can be easily swung out, so that the weight of the head can be increased, a ball can be easily hit and a stable stroke can be achieved.

FIG. 4 is a diagram showing a second embodiment of the present invention and is a partial sectional view of a head.
In this embodiment, a hole 10e extending along the axis of the shaft is recessed at the center position of the bottom surface of the shaft mounting portion on the striking surface 10c side of the shaft mounting position of the head 10 and the opening side thereof is recessed. The weight adjusting body 50 is mounted so as to be located inside without protruding from the outer surface of the head 10.

  As described above, by mounting the weight adjusting body 50 between the shaft axis P of the head and the striking surface 10c and adjusting the position of the center of gravity G, an accurate ball flight distance and a stable swing are possible. Even in such a configuration, the weight adjusting body 30 does not protrude to the outside, so that it does not hit other objects and is not damaged. Further, the wall thickness T3 of the striking member 40 and the wall thickness T2 of the striking member 30 can be made the same and can be easily manufactured.

  The weight adjusting body 50 and the head 10 are attached by forming a male screw portion 50b on the outer peripheral surface of the weight adjusting member 50 and a female screw portion 10k formed in the hole 10e of the head 10. It may be screwed so that it can be attached and detached (tightened to the head 50a and a long groove 50c for removal is formed). Alternatively, it may be configured to be attached by press-fitting or concave-convex fitting, or fixed by adhesion or the like.

  The weight adjusting body 50 is made of a material having a specific gravity greater than that of the head 10 in order to adjust the weight of the head 10. Specifically, the head 10 is made of aluminum (specific gravity: 2.7 g / cm 3). When the striking member 40 is made of titanium (specific gravity; 4.51 g / cm 3), a material larger than their total specific gravity, for example, copper (specific gravity; 8.93 g / cm 3), tungsten (specific gravity) 19.3 g / cm 3). In this case, a plurality of different weight adjusting bodies may be formed and exchangeable.

FIG. 5 is a diagram showing a third embodiment of the present invention, and is a partial sectional view of a head.
In this embodiment, the head 11 is formed such that the rear side of the striking surface 11a, specifically, the rear side of the mounting position of the shaft is gradually reduced in diameter so that the swing can be stabilized. It is configured. That is, by reducing the diameter in this way, it is possible to prevent contact with an uneven surface of the ground or an obstacle on the side of the ball, thereby improving swing-out performance.

  A hole 11e that opens outward in the longitudinal direction is formed at the center of the end surface of the head 11 that faces the striking surface 11a. A weight adjuster 60 is attached to the hole 11e. Yes. The weight adjusting body 60 is formed in a columnar shape having a predetermined length, and the outer surface (the outer surface of the head 60 a) is configured to be located inside the outer surface of the head 11. That is, the head 11 is formed with a recess 11f located on the opening side of the hole 11e. The head 60a of the weight adjusting body 60 is positioned here, and the weight adjusting body 60 is attached to the head 11. In this case, the head 11 is configured not to protrude from the outer surface and to be positioned inside.

  The weight adjusting body 60 and the head 11 are attached by forming a male screw portion 60b on the outer peripheral surface of the weight adjusting body 60 and a female screw portion 11k formed in the hole 11e of the head 11. It may be screwed so that it can be attached and detached (tightened to the head 60a and a long groove 60c for removal is formed). Alternatively, it may be configured to be attached by press-fitting or concave-convex fitting, or fixed by adhesion or the like.

  The weight adjusting body 60 is made of a material having a specific gravity greater than that of the head 11 in order to adjust the weight of the head 11. Specifically, the head 11 is made of aluminum (specific gravity: 2.7 g / cm 3). When the striking member 70 is made of titanium (specific gravity; 4.51 g / cm 3), a material larger than their total specific gravity, for example, copper (specific gravity; 8.93 g / cm 3), tungsten (specific gravity) 19.3 g / cm 3). In this case, a plurality of different weight adjusting bodies may be formed and exchangeable.

  The area to be reduced in diameter behind the head 11 is formed in the range of R200 to R800 (R300 in this embodiment) if it is formed as an arc. The reason for setting such a range is that when R is smaller than 200, the head length is shortened and the swing is not stabilized, and when R is larger than 800, the swing-out property is deteriorated. In addition, when forming in taper shape instead of circular arc shape, the angle is set to the range of 5 degrees-20 degrees for the same reason mentioned above.

According to the mallet golf stick configured as described above, the following functions and effects can be obtained.
By reducing the diameter of the rear side of the cylindrical head 11, not only the undulations on the course but also obstacles on the side of the ball, it does not get in the way when swinging, and the swing-out performance is improved and stable. You can swing. In this case, the reduction in weight on the rear side of the head due to the reduction in diameter can be balanced by the weight adjusting body 60, and the balance in the front-rear direction can be improved and stable swing can be performed. . Since the weight adjusting body 60 is located on the inner side of the outer surface of the head 11, the weight adjusting body 60 does not come into contact with other objects to be damaged, and thus the weight adjusting body 60 is damaged. It is not necessary to take special measures for preventing the problem, and the configuration is simplified. Further, by configuring the weight adjusting body 60 to be detachable from the head 11, it is possible to adjust the weight to an optimum weight according to the course condition, the physical condition of the player on the day, and the like.

  As described above, the embodiment of the present invention has been described. However, in the present invention, it is only necessary that the center of gravity of the head is located between the shaft axis and the striking surface, and the thickness, material, and weight adjustment body of the striking member are mounted. The method, position, etc. can be modified as appropriate. Also, the shape of the head can be appropriately modified.

  The present invention can be used not only for mallet golf but also for ball games in which a ball such as a gate ball is rolled in the hitting direction.

It is a figure which shows one Embodiment of the mallet golf stick which concerns on this invention, and is a side view which shows the whole structure. Sectional drawing of a head part. (A) is a figure which shows the state which held the mallet golf stick shown in FIG. 1, (b) is a figure which shows the state which hits with the mallet golf stick shown in FIG. It is a figure which shows 2nd Embodiment of the mallet golf stick which concerns on this invention, and sectional drawing of a head part. It is a figure which shows 3rd Embodiment of the mallet golf stick which concerns on this invention, and sectional drawing of a head part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mallet golf stick 5 Shaft 10, 11 Head 20, 30, 40, 70 Impact member 50, 60 Weight adjustment body

Claims (4)

A mallet golf stick having a shaft and a cylindrical head having a shaft mounting portion to which a tip of the shaft is attached and having a striking surface formed on at least one end thereof,
The shaft mounting portion is provided closer to the striking surface of the one end than the longitudinal center of the head, and the center of gravity of the head is located between the shaft mounting portion and the striking surface. Mallet golf stick.   2. The mallet golf stick according to claim 1, wherein a weight adjusting body is provided on a bottom surface portion located between the shaft mounting portion of the head and the striking surface.   3. The mallet golf stick according to claim 1, wherein an opposing surface of the hitting surface of the head is formed to have a small diameter, and the weight adjusting body is provided on the opposing surface. 4.   The mallet golf stick according to claim 2 or 3, wherein the weight adjusting body is configured to be detachable from the head.