JPH03123571A - Measuring apparatus for golf club head - Google Patents

Abstract

PURPOSE:To enable on angle of gravitational center to be simply measured by constituting a second swing body mounted swingably perpendicularly to the swing direction of a first swing body and a scale indicated on the first or second swing body so that one plane of the second swing body makes contacts with the tangential direction of a club face whatever direction the club face is directed. CONSTITUTION:A pin 70 is fixed to the surface of a first swing body 58 opposed to a second swing body 68 formed with a arcuate groove 72 into which is inserted the pin 70. The second swing body 68 swings within a range of the pin 70 making contact with both ends of the arcuate groove 72. The swing direction of the second swing body 68 is set parallel to the moving direction of an upper movable body 54 for example. A scale 74 is indicated on the surface of the second wing body 68 opposed to the first swing body 58. For example, an angle can be read from the scale 74 coinciding with a needle line 76 on the upper surface of the first swing body 58. This scale 74 is set such that a slant angle is zero degree when the second swing body 68 makes the maxi mum swing counterclockwise and increased as said body 68 swings clockwise from such a condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a measuring device for measuring the center of gravity angle and face regression of a club head of a golf club.

[Prior Art 1] In golf, clubs of various numbers are prepared so that the ball can be hit various distances. The number of a club serves as a guideline for flight distance depending on the player, and the conventional standards for the number of a club include lie angle and loft angle.

As shown in FIG. 6, the lie angle is expressed as the angle (θa) between the ground and the club shaft 94 when the club head 94 is held up naturally with the soul 92 on the ground. On the other hand, the loft angle is the angle (θb) between the club face 96 of the club head 90 and a plane including the club shaft 94 that is perpendicular to the ground, as shown in FIG. is shown as

These lie angles and loft angles are set so that the angles become larger in order as the number of the golf ball increases, whether it is a wood or an iron. For example, if W is a wood and iron is a work, an example of the lie angle and loft angle for each number (for example, work 5 is the number 5 iron) is as follows (these lie angles and loft angles are is not a standard).

This means that the larger the lie angle, the shorter the length of the club shaft 94 (and therefore the shorter the flight distance), and the thicker the loft angle (the larger the ball's upward angle at impact). Indicates that the larger the size, the shorter the flight distance.

Conventionally, when manufacturing or repairing golf clubs, these lie angles and loft angles are adjusted to angles with predetermined numbers, so the club head 90 related to these angles is Attention has been paid only to the angular relationship between the soul 92 of the club head 90, the club face 96 of the club head 90, and the club shaft 94. These lie angles and loft angles are determined by the club head 9.
Since this is the angle in a stationary state with 0 placed on the ground, it does not take into account several factors during the swing. That is, since the center of gravity of the club head 90, which is the heaviest of the golf clubs, is not on the extension line of the club shaft 94, the club head 90 is affected by the center of gravity during the swing, and the player has to grip the grip firmly. Even if the club shaft 94 rotates slightly about its axis, the club head 90 is likely to be oriented slightly deviated from the address state at the moment of impact, causing the ball to hook or slice. The deviation of the club head 90 at the moment of impact is as follows:
Possible causes include a deviation in the direction of the lie angle, a deviation in the direction of the loft angle, and a deviation in the plane of travel of the club face 96 relative to the ball.

The effect of the shift of the club head 90 due to this center of gravity is that when the club shaft 94 is held rotatably around the axis from the address state and lifted upward as it is,
This is also evident from the fact that the club shaft 94 rotates slightly about its axis.

From the above, we have invented a golf club that is designed and manufactured by incorporating the element of the center of gravity of the club head 90 so that the club shaft 94 will not rotate around its axis due to the influence of the center of gravity of the club head 90 during swing. The applicant has already filed a patent application. The content of this invention will be explained based on FIG. 8. A club shaft 94 is held horizontally on a holder 99 so as to be rotatable about its axis. Then, the club shaft 94 rotates and stands still until it settles into a stable state due to the influence of the center of gravity of the club head 90. The angle between the club face 96 and a plane 98 perpendicular to the ground in this stationary state is defined as θg (hereinafter, the angle θg will be referred to as the "center of gravity angle").

This center of gravity angle is set to a predetermined value or a predetermined range depending on the number of the club, and the golf club is manufactured or repaired based on the predetermined value or range. According to experiments, the center of gravity angles at which the balls of irons do not bend are within the range of 12°≦θg≦20° for Nos. 3 to 9. That is, if the center of gravity angle of each iron is within this range, there will be little deviation in the direction of the face surface upon impact. On the other hand, θg〈1
At 2°, the ball slices from the beginning and reaches 20°〈θ
When it reaches g, the ball hooks from the beginning.

In addition, within the range of 12°≦θg≦20°, it was found that it is desirable to decrease θg for irons with a small number, and to increase θg for irons with a large number. For example, in two types of irons with consecutive iron numbers, the iron with a higher number has the same or thicker θg than the iron with a smaller number. If the center of gravity angle is increased to correspond to the increase, it will be easier to match the lie angle and loft angle that are set at the same time as the center of gravity angle.In this way, the center of gravity angle of the golf club can be set to a predetermined degree value or range. By doing so, it is possible to prevent the ball from bending.

In addition to this center of gravity angle, there is a concept of face progression (hereinafter referred to as rFPJ) that measures whether or not the ball bends easily.・This FP is the distance between a vertical plane including the axial center of the club shaft and the center of gravity of the club head when the club shaft is held horizontally. The smaller this FP, the closer the center of gravity of the club head is to the axis of the club shaft, making it easier to control the direction of the club face and reducing the curvature of the ball. For this reason, it has been necessary to reduce the FP of golf clubs as much as possible in order to reduce the curvature of the ball.

[Problems to be Solved by the Invention] Conventionally, there was no concept of such a center of gravity angle, so there was no device for measuring the center of gravity angle.

Furthermore, although the concept of FP existed, there was no device that could easily measure this FP.

[Object of the Invention] The present invention has been made in view of the above problems, and provides a measuring device that can easily measure the center of gravity angle, F, and P of a golf club.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a base, and a club shaft of a golf club fixed to the base in order to horizontally hold the club shaft in a rotatable state about its axis. a holding body that moves the reference member to an arbitrary position in parallel with the base; a first rocking body that is swingably attached to the reference member; a second rocking body that is swingably attached in a direction perpendicular to the rocker;
It is composed of angle scales displayed on the first oscillator or the second oscillator.

[Function] To hold the club shaft horizontally and rotatably around its axis. A first rocking body is swingably attached to a reference member that can be moved to any position on the base, and a second rocking body that swings along a plane perpendicular to the rocking surface is attached to the first rocking body. It is installation. Thereby, one surface of the second rocking body can be brought into contact with the club face in the tangential direction, no matter what kind of club face the club head has. Therefore, the center of gravity angle can be read from the angle of the second rocking body with respect to the first rocking body.

In addition, while the club shaft is held horizontally and freely rotatable in its axial direction, the position where the reference member holding the first rocking body contacts a part of the club face, and the position where the reference member is moved to change the position of the club face. Measure the distance from the point where the sweet spot, which is the central bulge, contacts the reference member.

This interval is FP, and it can be easily read from a gauge.

[Example] Next, the present invention will be explained based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the measuring device for a golf club head according to the present invention, and FIG. 2 is a front view of the holder shown in FIG. 1. A holder 12 is fixed on the base lo, and the holder 12 can rotatably hold a club shaft 14 at two locations. The holder 12 is formed with an upwardly extending portion 18 that extends above the base 16, and is integrally formed with a first upper plate 20 that extends horizontally to one side from the upwardly extending portion 18. The first upper plate 20
The first rod 22 is attached to be slidable in the vertical direction with the first rod 22 inserted therethrough. A housing 26 that rotatably holds a roller 24 is fixed to the lower end of the first rod 22, and a knob 28 is fixed to the upper end of the first upper plate 20. A spring 30 is provided between the upper surface of the housing 26 and the lower surface of the first upper plate 20. When the knob 28 comes into contact with the upper surface of the first upper plate 20, no external force is applied to the spring 30, and the position of the roller 24 in this state is shown by a chain line in FIG. When the knob 28 separates from the upper surface of the first upper plate 20, a biasing force acts on the spring 30 to move the roller 24 to the position indicated by the dashed line in FIG.

A pair of rotatable rollers 32 are mounted at two locations (
In FIG. 2, the other location is provided at a position spaced apart in the axial direction of the club shaft 14. The first rod 22 moves up and down along a vertical plane passing exactly through the centers of the four rollers 32 in total.

When measuring the center of gravity angle, the first rod 22 and roller 24 are pulled up by the knob 28, and the club shaft 14 is placed on the pair of rollers 32 at two locations. When the knob 28 is then released, the roller 24 descends and comes into contact with the club shaft 14, and the club shaft is held rotatably by the roller 24 and the pair of rollers 32 due to the spring force of the spring 30.

The upper extending portion 18 of the holding body 12 includes the first upper plate 2.
0 and a second upper plate 36 extending horizontally on the opposite side are integrally formed, and a second rod 38 is attached so as to be slidable in the vertical direction while being inserted through the second upper plate 36. A pressing body 40 is fixed to the lower end of this second rod 38,
A knob 42 is fixed to the upper end of the second rod 38.

A spring 44 is provided between the upper surface of this pressing body 40 and the lower surface of the second upper plate 36. When the knob 42 comes into contact with the upper surface of the second upper plate 36, no external force is applied to the spring 44, and the position of the pressing body 40 in this state is shown by a chain line in FIG. The knob 42 is the second upper plate 36
When separated from the upper surface, a biasing force acts on the spring 44 to move the pressing body 40 to the position indicated by the dashed-dotted line in FIG. Groove 4
6 is formed, and the sliding axis direction of the second rod 38 is set to be perpendicular to the advancing direction of the groove 46.

Here, when measuring FP, hold the knob 42 and pull up the second rod 38 and the pressing body 40, and place the club shaft on the figure 7-shaped groove 46. Thereafter, when the knob 42 is released, the pressing body 40 is lowered by the spring 44, and the club shaft is rotatably held by the pressing body 40 and the wall surface of the figure 7 groove 46 of the base 16.

A guide 50 is fixed on the base 10, and a lower moving body 52 is movably attached along the guide 50. An upper moving body 54 is attached to the upper surface of the lower moving body 52 so as to be movable in a direction perpendicular to the moving direction of the lower moving body 52, and a reference member 56 extending vertically upward is fixed to this upper moving body 54. . That is, this reference member 56 can be moved to any position relative to the holder 12 by moving the lower moving body 52 and the upper moving body 54. This reference member 56 has a
A first swinging body 58 is attached to be able to swing freely about a shaft 60 along the axis. A bottle 62 is fixed to the reference member 56, and an arcuate groove 64 is formed in the first swinging body 58.
The bottle 62 is inserted into the arcuate groove 64, and the first swinging body 58 swings within the range where the bottle 62 contacts both ends of the arcuate groove 64. The swinging surface of the first swinging body 58 is parallel to the moving direction of the lower moving body 52, for example.

A shaft 6 is attached to one end surface of the first swinging body 58 on the swinging tip side.
6 is fixed, and a second rocking body 68 for measuring the center of gravity angle is swingably attached around this shaft 66. A bottle 70 is fixed to the surface of the first swinging body 58 facing the second swinging body 68, an arcuate groove 72 is formed in the second swinging member 68, and the bottle 7° is inserted into the arcuate groove 72. This second swinging body 68 swings within a range where the bottle 70 contacts both ends of the arcuate groove 72 . The swinging direction of the second swinging body 68 is, for example, parallel to the moving direction of the upper moving body 54.

A scale 74 is displayed on the surface of the second rocking body 68 facing the first rocking body 58, and the angle is read from the scale 74 at a position that matches the needle line 76 on the top surface of the first rocking body S8, for example. This scale 74 corresponds to the second rocking body 68 in FIG.
Set the scale so that the angle of inclination is 0 degrees when it touches the maximum in the counterclockwise direction, and the angle becomes thicker as it swings clockwise from that state.

A gauge 78 is movably mounted on the base 10, and the gauge 78 is provided with a rod 80 that projects from the gauge 78 and can be accommodated within the gauge 78. On the top surface of this gauge 78, a button 82 for zero setting and measurement termination, and a display section 84 are provided. That is, this gauge 78 displays the amount of movement of the rod 80 between the time when the button 82 is first pressed and the time when the button 82 is next pressed.
4.

Next, the operation of this device will be explained.

First, when measuring the center of gravity angle, the club shaft 14 is rotatably sandwiched between the roller 24 at the tip of the first rod 22 and a pair of rollers 32 at two locations. Next, move the lower moving body 52 and the upper moving body 54 to appropriate positions,
Thereafter, the first rocking body 58 and the second rocking body 68 are rocked so that the side surface 69 of the second rocking body 68 contacts the club face 86 of the club head in the tangential direction, as shown in FIG. The side surface 69 of this second rocking body 68 can be brought into tangential contact with the club face 86 no matter what direction it faces. That is, by moving the lower moving body 52 and the upper moving body 54, the reference member 56 perpendicular to the base 10 can be moved to an arbitrary position on the base 10,
Furthermore, the first rocking body 58 is configured to be swingable along the reference member 56, and the second rocking body 68 is swingable on a plane perpendicular to the first rocking body 58. This allows the side surface 69 of the second rocking body 68 to be directed in any direction. When the side surface 69 of the second rocking body 68 contacts the club face 86 in the tangential direction, the first rocking body 5
Read the scale 74 indicated by the needle line 76 on 8. That angle is the center of gravity angle.

On the other hand, when measuring FP, first place the club shaft 14 on the V-shaped groove 48 of the holder 12, push the pressing body 40 downward by the force of the spring 44, and then press the pressing body 40 and the V-shaped groove 48. A club shaft 14 is rotatably held on the wall surface of the club. Next, as shown in FIG.
and the upper moving body 54 are moved to bring the reference member 56 fixed to the lower moving body 52 into contact with any part of the club face 86. Then, move the gauge 78,
Bringing the tip of the rod 80 into contact with the side surface of the upper moving body 54,
Press button 82 on gauge 78 to set zero.

Thereafter, the reference member 56 is further moved in the direction in which it contacts the club face 86. Then, the club head rotates around the axis of the club shaft 14, and the reference member 56 comes into contact with the central bulge point P of the club face 86 (FIG. 5). If the button 82 of the gauge 78 is pressed at this point, the distance B moved from the zero set point is displayed on the display section 84. The moving distance B shown on this display section 84 is FP
It is. This FP indicates how much the actual state shown in FIG. 4 has deviated from the ideal state shown in FIG. It is possible.

In the above embodiment, the reference member 56 was brought into contact with the club face 86 when measuring FP, but since the direction of the club face 86 may be inclined with respect to the reference member 56, One rocking body 58 and second rocking body 6
8 is provided, and the side surface 68 of the second rocking body 68 is
a may be brought into contact with the club face 86.

Further, although the rod 80 of the gauge 78 is brought into contact with the upper movable body 54, it may be brought into contact with the reference member 56 or the second rocking body 68.

[Effects of the Invention] As described above, according to the present invention, since the second rocking body is supported by a plurality of displacement components, the second rocking body is supported no matter how the club face is oriented. One side of the club face can be brought into contact with the club face in the tangential direction, making it easy to measure the center of gravity angle. Furthermore, the displacement component or the second rocking body can be moved in contact with the club face, and the amount of movement FP can be easily measured with a gauge.

This makes it easy to measure the center of gravity angle and FP when manufacturing or repairing golf clubs, and the efficiency of one operation can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the measuring device for a golf club club head according to the present invention, Fig. 2 is a front view of the holder shown in Fig. 1, and Fig. 3 is a measurement of the center of gravity angle. Figures 4 and 5 are side views of the main parts of the device of the present invention in a state where FP is being measured, and Figure 6 is a side view of the main parts of the device of the present invention in a state where the FP is being measured. FIG. 7 is a front view of the golf club in the state where it is placed, FIG. 7 is a view taken in the direction of the arrow in FIG. . 10...Base, 12...Holding body, 14...Club shaft, 52...Lower moving body, 54... Upper moving body , 56... Reference member, 58...
First rocking body, 68... Second rocking body, 74...
...scale, 78...gauge. Figure 2

Claims (3)

[Claims] (1) A base, a holder fixed to the base for horizontally holding the club shaft of a golf club in a state where it can freely rotate around its axis, and a reference member placed in an arbitrary position parallel to the base. a moving means for moving; a first rocking body that is swingably attached to the reference member; and a second rocking body that is swingably attached to the first rocking body in a direction perpendicular to the swinging direction. , and a scale displayed on the first rocking body or the second rocking body. (2) The apparatus for measuring a club head of a golf club according to claim 1, wherein a gauge for measuring the distance between two points having a terminal that can be contacted with either the reference member or the moving means is attached to the base. (3) The moving means includes a lower moving body that moves in one direction on a base, and an upper moving body that fixes the reference member and moves in a direction perpendicular to the moving direction of the lower moving body with respect to the lower moving body. 2. The golf club club head measuring device according to claim 1, further comprising a body.