JP2002224251A - Method of assembling putter and putter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a putter which can exert correct forward rotation and correct direction to a ball, and a method of assembling the putter. SOLUTION: This method of assembling the putter comprises finding out the desirable relative rotational position of a shaft with respect to the clubface of a club head where the shaft vibrates correctly in the direction orthogonal with the clubface of the head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a putter assembling method and a putter.

[0002]

2. Description of the Related Art A putter is assembled by inserting a tip end of a putter shaft into a hosel of a putter head. At this time, conventionally, the relative rotational position of the head with respect to the axis of the shaft has not been considered at all. That is, the shaft was simply inserted into the hosel of the head and fixed. The grip is fixed to the butt end of the shaft before or after the above operation.

[0003] However, the putter shaft, whether steel or carbon, has a cross section that is not a perfect circle, an axis that is not a perfect straight line, and a wall thickness that is not even. In both the longitudinal direction and the circumferential direction, the dimensions, weight, physical properties, and the like are non-uniform, and its vibration characteristics are, in fact, different depending on the rotational position about the axis. For this reason, in a conventional putter assembling method in which the shaft is simply fixed without considering the relative rotational position of the head with respect to the face surface, when a ball is hit on the face surface, the direction other than the direction orthogonal to the face surface is different. The shaft could vibrate in the direction. In the worst case, the shaft may even make a circular motion when hitting the ball.

[0004] Among golf clubs, the putter is a very delicate club, and if the shaft vibrates in a direction other than the direction perpendicular to the face, the rotation of the hit ball will not be the correct forward rotation. It is thought that the direction will obviously worsen.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of assembling a putter with excellent directionality of a ball to be shot, based on the above consideration of the problems with the conventional method of assembling a putter.
In other words, according to the present invention, when a ball is hit, the shaft vibrates in a direction orthogonal to the face surface (or
The object is to obtain a method of assembling a putter having the largest vibration component in a direction perpendicular to the face surface.

[0006]

SUMMARY OF THE INVENTION The present invention recognizes that if the shaft oscillates correctly in a direction perpendicular to the face of the head, a correct forward rotation can be given to the ball to be hit, thereby improving the directivity. As described above, in both the longitudinal direction and the circumferential direction, the dimensions, weight, physical properties, and the like are non-uniform, and the vibration characteristics vary depending on the rotational position about the axis. It has been completed with the idea of finding and fixing the relative rotational position of a preferable putter shaft.

The method of the present invention comprises a relatively simple first method and a more preferable second method. The first method is a method in which a dummy head having a center of gravity on the axis of the putter shaft and having the same weight as the putter head is temporarily connected to the tip end of the putter shaft. The step of fixing the butt end of the putter to the fixed base and the step of vibrating the dummy head putter up and down and detecting the direction of the vibration are performed while changing the relative rotational position about the axis of the shaft with respect to the fixed base. Repeatedly finding a relative rotational position at which the dummy head putter vibrates correctly in the vertical direction; and removing the dummy head at the relative rotational position at which the dummy head putter vibrates correctly in the vertical direction, and turning the face of the putter head horizontally. Fixing to the shaft.

In this first method, the eccentricity of the putter head weight from the shaft axis is not considered. A more preferable second method considers the eccentricity of the putter head weight with respect to the shaft axis, and the putter head is temporarily attached to the tip end of the putter shaft by enabling relative rotation about the axis of the shaft. Joining: fixing the butt end of the temporary joint putter with the face surface of the head facing horizontally, and vibrating the temporary joint putter up and down, and detecting the direction of the oscillation. Repetitively changing the relative rotational position about the axis of the shaft with respect to the table to find a relative rotational position where the temporary coupling putter oscillates vertically vertically; and at a relative rotational position where the temporary coupling putter oscillates vertically vertically Fixing the putter head with the face oriented horizontally to the putter shaft. It is characterized.

[0009]

1 and 2 show an example of an apparatus configuration (vibration measuring machine 10) for carrying out the method of the present invention. The vibration measuring device 10 has a fixed base 11 and a movable base 12 paired with the fixed base 11, and the movable base 12 moves forward and backward with respect to the fixed base 11 by an air cylinder device 13.
14 is a frequency measuring sensor for measuring the natural frequency, 15
Is a vibration direction detection sensor that measures the vibration direction (detects whether the vibration is in the vertical direction).

In the first method of the present invention, the putter shaft 20 butt end is inserted between the fixed base 11 and the movable base 12, and the movable base 12 is moved to the fixed base 11 by the air cylinder device 13. Fix it. Next, this shaft 2
A dummy head 30D having a center of gravity on the axis of the shaft 20 and having the same weight as the putter head 30 (not necessarily exactly the same) is temporarily connected to the zero chip end.

After the butt end of the temporary combined body (dummy head putter) of the putter shaft 20 and the dummy head 30D is fixed as described above, the tip (dummy head 30D) is then deformed in the vertical direction. Open. Then, since the dummy head putter generally vibrates up and down,
Observe the vibration direction. As described above, the shaft 20
Has a non-isotropic property, so that there is no guarantee that this vibration direction is generated correctly in the vertical direction. Therefore, the observation (measurement) of the vibration direction is repeated while changing the relative rotational position of the dummy head putter (the putter shaft 20) with respect to the fixed base 11. FIG. 3 schematically illustrates a case A where the vibration of the shaft 20 correctly occurs in the vertical direction, a case B where the vibration occurs obliquely, and a case C where the shaft 20 moves circularly.
Then, at a relative rotation position where the dummy head putter correctly vibrates in the vertical direction, the dummy head 30D is removed,
With the face surface 32 of the putter head 30 oriented horizontally, the tip end of the shaft 20 is inserted into the hosel 31 and fixed (FIGS. 2 and 4).

The frequency measuring sensor 14 and the vibration direction detecting sensor 15 are composed of, for example, a light emitting element and a light receiving element which are located with the vibration plane of the shaft 20 interposed therebetween. In the vibration direction measuring sensor 15, the light emitting element emits parallel light in the vertical direction toward the shaft 20, the light receiving element (line sensor) receives the light, and detects the position and the number of pixels that did not receive the light. I do. If the shaft 20 is vibrating up and down correctly, the width of the light blocked by the shaft 20 is the smallest, and therefore, the number of sensors that do not receive light immediately below or directly above the shaft 20 is the smallest. On the other hand, if the vibration direction is diagonal or a circle is drawn, light does not enter more sensors (or the amount of incident light decreases). It can be detected that the shaft 20 is not oriented and that the vibration direction of the shaft 20 is correctly oriented in the up-down direction (the largest vibration component in the up-down direction). Frequency measurement sensor 14
Detects the number of times a specific point of the shaft 20 has passed per unit time and measures the frequency.

It is theoretically and empirically known that when the vibration of the shaft 20 is correctly generated in the vertical direction, the natural frequency thereof becomes highest. Thus, the vibration direction detection sensor 15 can be used to detect that the vibration of the shaft 20 is correctly directed in the vertical direction from the relative rotation position indicating the highest frequency. Alternatively, the frequency measurement sensor 1
4 and the vibration direction detection sensor 15 may be used to detect that the vibration of the shaft 20 is correctly directed in the vertical direction. The vibration direction can also be detected visually.

FIGS. 5 and 6 are diagrams for explaining the second method of the present invention. The butt end of the putter shaft 20 is inserted between the fixed base 11 and the movable base 12, and the movable base 12 is moved toward the fixed base 11 by the air cylinder device 13.
Fix it. Next, the tip end of the putter shaft 20 to which the butt end has been fixed in this manner is inserted into the hosel 31 of the putter head 30 so that the tip end can be relatively rotated. This state is a temporary connection state, and the head 30
Relative rotation about the axis of the shaft 20 is possible, and when the shaft 20 is vibrated, it vibrates together with the shaft 20.

The temporary joint body (temporary joint putter) of the putter shaft 20 and the head 30 is vibrated in the same manner as in the first method while the face surface 32 of the head 30 is oriented horizontally, and the vibration direction is changed. Observe (measure).

The measurement of the vibration direction is performed by the putter head 3.
This is repeated while changing the relative rotational position of the putter shaft 20 with respect to 0. The conditions for applying the vibration are that the direction of the face surface 32 of the head 30 is kept horizontal, and the direction of the vibration applied to the temporary joint putter between the shaft 20 and the head 30 is substantially the vertical direction. Therefore, each time the measurement, the butt end of the putter shaft 20 is released from between the fixed base 11 and the movable base 12, and the putter head 3
After changing the relative rotational position with respect to the fixed base 11 again.
The procedure of fixing between the and the movable base 12 is repeated. An appropriate pressure for fixing the butt end of the shaft 20 by the fixed base 11 and the movable base 12 is, for example, ² to 3 kg / cm ² .

By repeating the above measurement, it is possible to find the relative rotational position between the putter shaft 20 and the head 30 in which the vibration direction is correctly directed vertically. Similarly to the first method, the natural frequency is measured by the vibration direction detection sensor 15, and the relative rotational position of the shafts 20 and 30 having the highest frequency can be determined as the position where the vibration direction is correctly directed in the vertical direction. it can.

According to the above measurement, the putter shaft 20 and the head 30 in which the temporarily combined putter vibrates correctly in the vertical direction.
When the putter shaft 20 and the head 30 are fixed at the relative rotational position, when the ball is hit on the face surface 32, the putter shaft 20
Are correctly vibrated in the direction perpendicular to the face surface 32 (the vibration component in the direction perpendicular to the face surface 32 is the highest).

The grip is finally putter shaft 20.
To the butt end.

According to the present invention, it is possible to obtain a putter assembling method and a putter which can give a proper forward rotation to a ball, has excellent directivity.

[Brief description of the drawings]

FIG. 1 is a front view of a vibration measuring device used in a putter assembling method according to the present invention, in which a temporary combination of a putter shaft and a dummy head (dummy head putter) is fixed.

FIG. 2 is a plan view of the same.

FIG. 3 is a diagram schematically showing an example of a vibration direction of a dummy head putter, as viewed from an axial direction of a shaft.

FIG. 4 is a diagram in which a putter head is fixed to the shaft of FIG. 3;

FIG. 5 is a front view of a vibration measuring device used in the putter assembling method according to the present invention, in which a temporary joint (temporary joint putter) of a putter shaft and a putter head is fixed.

FIG. 6 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration measuring machine 11 Fixed stand 12 Movable stand 13 Air cylinder device 14 Frequency measurement sensor 15 Vibration direction detection sensor 20 Shaft for putter 30 Head for putter 30D Dummy head 31 Hosel 32 Face surface

Claims (5)

[Claims] 1. Temporarily connecting a dummy head having a center of gravity on the axis of the putter shaft and having the same weight as the putter head to a tip end of the putter shaft;
The step of fixing the butt end of the dummy head putter to the fixed base and the step of vibrating the dummy head putter up and down and detecting the direction of the vibration are performed by determining the relative rotation position of the shaft with respect to the fixed base. Repeating while changing, to find a relative rotation position where the dummy head putter vibrates vertically vertically; and at a relative rotation position where the dummy head putter vibrates vertically correctly, remove the dummy head and level the face of the putter head horizontally. Fixing the shaft toward the shaft. 2. The putter assembling method according to claim 1, wherein the relative rotational position at which the dummy head putter correctly vibrates in the vertical direction is a relative rotational position at which the dummy head putter has the highest natural frequency. Assembly method. 3. A step of temporarily connecting the putter head to the tip end of the putter shaft by enabling relative rotation about the axis of the shaft; and connecting the butt end of the temporarily connected putter to the face surface of the head. Repeating the step of fixing in a state facing horizontally and the step of oscillating this temporary bonding putter up and down and detecting the direction of the oscillation while changing the relative rotation position about the axis of the shaft with respect to the fixed base, Finding a relative rotational position at which the temporary joint putter vibrates vertically in a correct direction; and fixing a putter head with the face horizontally oriented to the putter shaft at a relative rotational position at which the temporary joint putter vibrates up and down correctly. A method for assembling a putter, comprising: 4. The putter assembling method according to claim 3, wherein the relative rotation position at which the temporary connection putter correctly vibrates in the vertical direction is a relative rotation position at which the natural frequency of the temporary connection putter is highest. Assembly method. 5. A putter assembled by the assembling method according to claim 1.