JPH0515618A - Ball fitting means - Google Patents

Abstract

PURPOSE:To provide the golf club (hitting means) which can stabilize the flying direction of a ball and extend the flying distance of the ball. CONSTITUTION:The golf club constituted by forming a ball fitting surface part of a plate member 12 and supporting the plate member by a head body 11 via an elastic support 13 is provided with adjusting screws 14 which can be screwed forward and backward into and from the inside of the elastic support 13 in mounting holes 11c opened in the rear part of the head body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a ball hitting tool suitable for, for example, a golf club, a baseball bat, a ball hitting tool for a gate ball, and more specifically, it stabilizes the flight direction of the ball and extends the ball flight distance. The present invention relates to a hitting tool.

[0002]

2. Description of the Related Art Conventionally, in hitting tools such as golf clubs, the hitting surface of the club head is formed by a plate member, and the plate member is supported by a hitting tool body, that is, a head body through an elastic support. Is proposed. In a golf club with such a configuration,
By forming the plate member with a highly rigid material,
Since the plate member can be moved substantially in parallel by utilizing the compressive deformation of the elastic support without significantly deforming the plate member itself when hitting the ball, it is possible to stabilize the flight direction of the ball.

By the way, in this type of golf club, it is necessary to effectively impart the kinetic energy of the golf club to the balls in order to increase the coefficient of restitution between the balls and extend the flight distance of the balls. When the ball collides with the golf club at the time of hitting the ball, the hitting surface portion of the golf club is elastically deformed as the ball is deformed, and strain energy is accumulated therein. Therefore, in order to efficiently impart the strain energy accumulated inside the golf club to the ball to extend the flight distance of the ball, the time variation of the deformation amount of the golf club during the collision is changed with the time variation of the deformation amount of the ball. It is important to tune in.

FIG. 7 shows the change over time in the amount of deformation when a golf club and a ball collide. That is, in the figure, the vertical axis represents the amount of deformation of the ball and the golf club (the amount of compression in the ball, the amount of bending of the ball striking surface in the golf club), the horizontal axis represents time (t), and the curve D
The curve b shows the temporal change of the deformation amount of the ball during the collision, and the curves D1 to D3 show the temporal change of the deformation amount of the ball striking face portion during the collision of the three types of golf clubs.

The ball and the golf club start to collide at time to, the amount of compression of the ball becomes maximum at time t1, and the ball jumps out of the ball striking face of the golf club at time t2.

The golf club having the characteristic of the curve D2 also reaches the maximum deflection amount when the ball reaches the maximum compression amount (time t1), and is in the zero deflection amount state when the ball jumps out of the ball striking face portion (time t2). Has returned to. That is, since the golf club having the characteristic of the curve D2 has a ball striking face portion which is in synchronization with the ball, the strain energy accumulated inside the golf club can be efficiently given to the ball. Therefore, it has a large coefficient of restitution,
The flight distance of the ball can be extended.

On the other hand, since the golf club having the characteristics of the curves D1 and D3 is not in synchronism with the change characteristic of the deformation amount of the ball, the strain energy accumulated inside the golf club cannot be efficiently applied to the ball. Therefore,
The coefficient of restitution decreases, and a large flight distance cannot be obtained.

Now, if the mass of the ball is mb, the rigidity of the ball is kb, the effective mass of the golf club head is mc, and the effective rigidity of the golf club is kc, the deformation amount of the ball and the golf club during a collision can be calculated. The condition for synchronizing the temporal change can be expressed by the following equation.

[0009]

[Mathematical formula-see original document] mb / kb = mc / kc Furthermore, in the above-mentioned golf club, the plate member supported by the elastic support member is sufficiently rigid as compared with the elastic support member, and the plate member itself bends when colliding with the ball. Is so small as to be negligible, it is sufficient to consider only the rigidity of the elastic support for the effective rigidity of the golf club. Therefore, the effective contact area of the elastic support that contacts the plate member is A, and the Young's modulus of the elastic support is E,
When the effective thickness of the elastic support is T, the effective stiffness kc of the golf club can be expressed by the following equation.

[0010]

[Equation 2] kc = AE / T Therefore, in order to satisfy the above-mentioned tuning condition, Equation 1
The effective contact area A, the Young's modulus E, or the effective thickness T of the elastic support may be set so as to satisfy the condition of.

[0011]

However, some hitting tools such as golf clubs of the related art do not satisfy the condition of Formula 1 due to variations in the material and thickness of the elastic support, so that a sufficient flight distance is achieved. Was one of the reasons why I could not get. Further, the conventional elastic support has a predetermined effective contact area A,
Since it has only the Young's modulus E and the effective thickness T, when the small ball and the large ball having different masses are used, or when the weight for adjusting the balance and weight is attached to the head main body, the above numerical formula 1 There was a problem that the condition of No longer be satisfied.

Therefore, an object of the present invention is to provide a ball hitting tool capable of stabilizing the flight direction of a ball and extending the flight distance of the ball.

[0013]

In order to achieve the above object, the present invention provides a ball hitting tool in which a ball hitting surface portion is formed by a plate member, and the plate member is supported by a ball hitting tool main body through an elastic support. It is characterized in that an adjusting screw operable from the outside is provided so as to be capable of screwing back and forth into the elastic support body.

[0014]

In the ball striking tool having the above-mentioned structure, the plate member can be moved in parallel in the ball striking direction by compressing and deforming the elastic support at the time of ball striking, so that the ball flying direction can be stabilized. Moreover, since the adjusting screw can be externally rotated to adjust the screwing amount of the adjusting screw into the elastic support, the effective thickness of the elastic support is adjusted so that a large repulsion coefficient can be obtained by satisfying the condition of the above-mentioned formula 1. The height can be easily adjusted.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment in which the present invention is applied to a golf club will be described below with reference to FIGS. In addition, in these drawings, the same or similar components are designated by the same reference numerals.

1 to 5 show an embodiment of the present invention. First, referring to FIG. 1, a club head 10 of a golf club includes a head main body 11 as a hitting tool main body, and the club head 10 has a hitting surface portion formed separately from a head main body 11 by a plate member 12. And a recess 11 into which the plate member 12 is slidably fitted in the head body 11 in the front-back direction.
a is formed. The head body 11 is made of metal, for example.
Fiber reinforced plastics, fiber reinforced metals and the like are preferably formed in a hollow shape. On the other hand, the plate member 12 is formed of a material having a high Young's modulus, such as ceramics, metal, fiber reinforced plastic, or fiber reinforced metal so as not to be easily deformed when it collides with a ball.

On the back surface of the plate member 12, for example, rubber,
Elastic support 1 made of elastic material such as spring steel or plastic
3 is attached. The elastic support 13 includes a base portion 13a adhered to the back surface of the plate member 12 and, for example, four elastic leg portions 13 that are substantially cylindrical and are integrally provided upright on the back surface side of the base portion 13a. .. As shown in FIG. 3, it is preferable that the four elastic legs 13 are arranged in the vicinity of the corners of the peripheral portion of the plate member 13.

Leg holding holes 11b into which the elastic leg portions 13b of the elastic support 13 are slidably fitted are formed in the bottom surface of the recess 11a of the head main body 11, and the rear end bottom surface of each leg holding hole 11b is formed. A mounting hole 11c for holding the adjusting screw 14 rotatably is formed coaxially therewith. This mounting hole 11c
Rotatably supports a neck portion 14c between a head portion 14a of the adjusting screw 14 and a tip screw portion 14b.
The movement in the axial direction is restricted by the head 14a of No. 4 and the retaining ring 15 attached to the neck 14c. Mounting hole 1
1a is a counterbore 1 for receiving the head 14a of the adjusting screw 14.
An opening is formed in the rear part of the head body 11 via 1c.

The screw portion 14b of the adjusting screw 14 described above is a screw hole 13 formed in the elastic leg portion 13b of the elastic support 13.
It is screwed into c so that it can be moved back and forth. Therefore, in this embodiment, the plate member 12 and the elastic support 13 are supported by the head main body 11 via the four adjusting screws 14.

When the plate member 12 and the elastic support 13 of the club head 10 having the above structure are attached to the head body 11, the elastic support 1 fixed to the plate member 12 is used.
3 to the leg holding holes 11 of the head body 11.
b, while a tool (not shown) inserted into the counterbore 11c from the rear of the head body 11 is used to adjust the screw 14
It fits in the tool engaging groove of the head of the. In this way, by turning the four adjusting screws 14 in the screw-in direction at substantially the same time or little by little in order, the adjusting screws 14 are screwed into the elastic leg portion 13 by substantially the same amount, and the plate member 12 and the elastic support are supported. The body 13 can be mounted in the head body 11. The effective thickness of the elastic support 13 as an elastic body, that is, the screw tip and the plate member 1 is adjusted by appropriately adjusting the screwing amount of the adjusting screw 14 to the elastic leg portion 13.
The length T (see FIG. 1) of each elastic leg portion 13b between the two can be adjusted to a desired value.

In the golf club head having the above structure, the sum of the cross-sectional areas of the four elastic leg portions 13b is defined as the effective contact area A of the elastic support member in the equation 2, and the effective contact area A between the screw tip and the plate member 12 is defined. By setting the length T of each elastic leg portion 13b to be the effective thickness T of the elastic support member in the equation 2, and the Young's modulus of the length T portion of each elastic leg portion 13b to be the Young's modulus E in the equation 2, The effective rigidity kc of the head can be obtained from the equation 2. Therefore, by adjusting the screwing amount of the adjusting screw 14 with respect to the elastic leg portion 13b to adjust the length T of each elastic leg portion 13b between the screw tip and the plate member 12 to a desired value, the above-mentioned formula 1 The effective rigidity kc of the golf club head can be adjusted so as to satisfy the condition of.

FIG. 5 shows the moment of collision when the ball 16 is hit with the golf club head having the above structure. Due to the collision with the ball 16, the elastic leg portion 13 of the elastic support 13
b is compressed and deformed, and accordingly, the plate member 12 is translated inward of the recess 11a. Since the plate member 12 itself is not largely deformed, the flight direction of the ball 16 is stabilized.

FIG. 6 shows another embodiment of the present invention. In the figure, the same components as those in the above embodiment are designated by the same reference numerals. In this embodiment, the rear end portion of each elastic leg portion 13b of the elastic support 13 has a leg portion holding hole 11
The adjustment screw 14 is fixed inside the head main body 11
Is screwed into the mounting hole 11c, and further screwed into the screw hole 13c of the elastic leg portion 13b. Other configurations are the same as those in the above embodiment.

Therefore, in this embodiment, the adjusting screw 1
By screwing 4 back and forth, it is possible to adjust the screwing amount of the adjusting screw 14 to the elastic leg portion 13b of the elastic support 13, and thereby to adjust the effective thickness T of the elastic support 13. You can

Although the embodiments shown in the drawings have been described above, the present invention is not limited to the embodiments described above, and various changes may be made to the constituent elements within the scope of the invention described in the claims. Can be added. For example,
Various changes can be made to the number of the elastic legs 13b and the adjusting screws 14, the method of fixing the elastic legs 13b to the plate member 12, and the like. Further, the adjusting screw 14 may be rotatable from an opening formed on the upper surface, the side surface, the bottom surface, etc. of the head body 11, and the adjusting screw 1
For example, a flange-shaped operating portion integrally provided on the head 4 may be projected on the upper surface or the side surface of the head body 11, and the operating screw may be operated to rotate the adjusting screw. Further, the adjusting screw may be screwed into the elastic leg portion 13b of the elastic support 13 from the front side of the plate member 12, and the adjusting screw may be rotationally adjusted from the front side of the head. Further, the present invention can be similarly applied to, for example, a baseball bat other than the golf club.

[0026]

As is apparent from the above description, according to the present invention, when the ball is hit, the elastic support can be compressed and deformed to move the plate member in parallel with the hitting direction. Can be stabilized. Moreover,
It is possible to adjust the screwing amount of the adjusting screw to the elastic support by turning the adjusting screw from the outside, so that the time variation characteristic of the deformation amount at the time of collision between the ball hitting tool and the ball should be adjusted to maximize the coefficient of restitution. Can be easily synchronized. Therefore, it is possible to provide a ball hitting tool capable of stabilizing the flight direction of the ball and extending the flight distance of the ball.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of a golf club head showing an embodiment of the present invention.

2 is a view of the club head shown in FIG. 1 in FIGS.
Sectional drawing which followed the 2 line.

FIG. 3 is a front view of the club head shown in FIG.

FIG. 4 is a rear view of the club head shown in FIG.

5 is a schematic partial cross-sectional plan view showing the moment of collision between the club head and the ball shown in FIG. 1. FIG.

FIG. 6 is a partial cross-sectional plan view of a golf club head showing another embodiment of the present invention.

FIG. 7 is a graph showing a time change characteristic of a deformation amount at the time of a collision between a golf club and a ball.

[Explanation of symbols]

10 ... Golf club head (ball hitting tool), 11 ... Head body (ball hitting tool body) 11a ... Recess,
11b ... Leg holding hole, 11b ... Mounting hole,
11c ... counterbore hole, 12 ... plate member,
13 ... Elastic support, 13b ... Elastic legs,
14 ... Adjusting screw, 15 ... Retaining ring.

Claims (1)

Claims: 1. A ball striking face portion is formed by a plate member,
A ball striking tool in which the plate member is supported by a ball striking tool main body via an elastic support, wherein an adjusting screw which can be operated from the outside is provided so as to be able to advance and retract into the elastic support.