JPH04325171A - Method and device for measuring hardness of gold club - Google Patents

Abstract

PURPOSE:To execute the evaluation with a kick point and near the human touch by representing hardness with the most easily bendable position at the time when a gold club is deformed elastically in the direction orthogonal to the lengthwise direction, and a load (load/displacement) per unit displacement in its position. CONSTITUTION:Both ends of a gold club 11 are supported in a reference height position (h) by supporting parts 12, 13, and a load P is applied from the orthogonal direction extending over a prescribed length range R except both the end parts. The most easily deformable position is the maximum deforming position L in which the deformation is the largest to load ratio, and when the load P is nearly constant, it is represented in a position in which the displacement S from the reference height (h) is the largest, and it can be evaluated that the ratio of a load P/displacement amount S is larger the club is harder. Also, hardness H is set as a function of the maximum deforming position L and the load P/the displacement S, and can be represented by H=f(L, P/S), as well.

Description

[Detailed description of the invention]

0001

TECHNICAL FIELD The present invention relates to a method and apparatus for measuring the hardness of a golf club (including a single shaft).

0002

BACKGROUND OF THE INVENTION Conventionally, the hardness of a golf club has been expressed by its natural frequency or bend value. The natural frequency is the frequency of vibration of the club when a certain part of the club shaft is fixed and the tip (tip) side is bent and released. A hard club swings fast and a soft club swings slowly, so the higher this natural frequency, the more
It's a hard club.

[0003] The bend value is the maximum amount of displacement on the tip side when the butt (root) side of the club shaft is fixed and a constant weight is suspended from the tip side. The harder the
There is little deformation, so hardness can be expressed by the magnitude of this bend value.

On the other hand, there is a concept called kick point as another method for evaluating clubs. Simply put, this refers to the part of the club that is most susceptible to deformation; a club with a kick point on the tip side is called a first pitch, a club with a kick point on the butt side is called a base pitch, and a club between the two is called a middle pitch. This kick point can be determined by, for example, reversing the tip and back of the club and placing the weight on the butt side to obtain the vent value (butt side vent value).
is measured in the same manner, and the ratio of this to the previous vent value (tip side vent value) is expressed as bat side vent value/tip side vent value. For example, when this ratio is about 2.3, it is called a medium tone, when it is larger than this (for example, 3.0) it is called a first tone, and when it is smaller (for example, 1.8) it is called a base tone.

According to the present inventor, when this kick point is taken into consideration, the conventional natural frequency and bend value evaluate the hardness of the club only in one aspect. In other words, even clubs with the same natural frequency or bend value will feel completely different if the kick point is different. For example, even if a club in the previous condition and a club in the original condition show the same vent value, the club in the previous condition is harder. Similarly, even if a club in the previous condition and a club in the original condition exhibit the same natural frequency, the club in the original condition is harder.

[0006]

[Object of the Invention] Based on the awareness of the problems with the conventional golf club evaluation method, the present invention aims to provide a new golf club hardness measurement method (evaluation method) and its measuring device. shall be.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to the position where a golf club is most easily bent when elastically deformed in a direction perpendicular to its length direction, and the load per unit displacement at that position where it is most easily bent. This method was developed based on the idea that if the hardness of a golf club is measured based on the amount of displacement (displacement), then the true hardness of the golf club can be measured, taking into account the kick point.

That is, according to one aspect of the method of the present invention, both ends of a golf club are supported at a reference height, and the golf club is moved in the longitudinal direction from a direction substantially perpendicular to the longitudinal direction of the golf club. Apply a load sequentially to cause elastic deformation, detect the maximum deformation position in the length direction where the deformation is greatest in terms of load ratio, and calculate the ratio between the load at this maximum deformation position and the amount of displacement from the reference height at that time. However, it is characterized in that the hardness of the golf club is expressed using this maximum deformation position and the load/displacement amount.

Hardness can also be expressed by directly indicating its numerical value. However, for example, when the maximum deformation position is L and the load/displacement is P/S, the hardness H of the golf club is expressed as a function of L and P/S, H = f (L, P/S). Is possible. It is clear that S/P may be used instead of P/S, but P/S can express hardness more directly. Note that the maximum deformation position in the length direction where the deformation is the largest in terms of the load ratio is the longitudinal position where the load is the smallest in terms of the displacement ratio. Further, the method of the present invention
It can also be used to specifically indicate the position corresponding to the kick point. That is, a load is sequentially applied to a golf club in the longitudinal direction from a direction substantially perpendicular to the longitudinal direction to deform the golf club, and the maximum deformation position in the longitudinal direction where the deformation is greatest in terms of the load ratio is detected. The hardness of a golf club is expressed by the maximum deformation position or load/displacement amount. The deformation position can be expressed as an absolute value from the end of the golf club on the bat side or the tip side, or as a percentage of the total length. In other words, since the length of golf clubs differs depending on the number of golf clubs, if the length is expressed as a percentage of the total length, it is possible to indicate the kick point position common to all clubs.

The apparatus of the present invention for realizing the above-described method of the present invention is provided with a pair of support parts for supporting both ends of a golf club on a measuring base, and a reference height connecting the pair of support parts is provided. A load applicator is provided which is movable in an axial direction substantially parallel to the golf club and applies an elastic deformation load to the golf club held between the pair of support parts, and a feeder which applies an axial movement to the load applicator is provided. The present invention is characterized by comprising a device, a position detector for detecting the moving position of the load applying device, and means for detecting the position of the force applying point of the load applying device with respect to the golf club and the load by the load applying device.

[0011] In order to deal with clubs of different counts and hardnesses, it is desirable that the loader be supported so that its position can be adjusted in a direction perpendicular to a reference height connecting the pair of supports. For example, a spring scale can be used as the load applying device.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings. Figure 1,
FIG. 2 is a diagram showing the principle of the golf club hardness measuring method according to the present invention. Both ends of the golf club 11 are provided with support portions 12,
13, it is supported at the reference height position h. This support part 1
2 and 13 preferably support both ends of the club 11 so as to be substantially freely rotatable and axially movable.

A load P is applied to the club 11 over a constant length range R excluding both ends from a direction perpendicular to the reference height position h. The reason why both ends are excluded is that it is obvious that both ends are less likely to deform than the middle part. Then, since the club 11 deforms, a deformation curve can be drawn. This deformation curve differs depending on the number and type of club 11, and the position where deformation is most likely to occur differs depending on the club. This position that is most easily deformed is the maximum deformation position where the deformation is the largest in terms of the load ratio, and if the load P is substantially constant, it is represented by the position where the amount of displacement from the reference height position h is the largest. This maximum deformation position is also the position where the maximum deformation occurs with the smallest load in terms of displacement ratio. This maximum deformation position can be expressed as an absolute position L, for example, with the tip side end (or butt side end) as a reference position. Alternatively, if the total length of the club 11 is LL, then (L/LL)×100=relative position Ls, which can be expressed as a percentage of the total length. This absolute position L or relative position Ls corresponds to a conventional kick point, and can be expressed as a specific numerical value.

Next, hardness is expressed using the load P at the maximum deformation position L and the displacement S from the reference height position h at that time. That is, since the load P/displacement amount S represents the load necessary to deform the club by a unit amount, the larger this value is, the harder the club can be evaluated.

The present invention is directed to the maximum deformation position L or Ls.
The hardness of the club 11 is evaluated based on the load P/displacement S, or both. For example, even if the values of load P/displacement amount S are the same, if the value of maximum deformation position L (Ls) is different, the club with a larger maximum deformation position L (Ls) will be a softer club. According to conventional standards, the large, medium, and small maximum deformation positions L (Ls) correspond to the original condition, the intermediate condition, and the preliminary condition, respectively, but the present invention
Since this can be expressed numerically and the hardness can be expressed by taking into account the load per unit displacement, a more preferable expression can be achieved.

In the method for measuring the hardness of the club 11 according to the present invention, the hardness H can also be expressed as a function of the maximum deformation position L (Ls) and the load P/displacement S. That is, hardness H
= f(L, P/S). Although a specific function is not presented, it is possible, for example, to weight the maximum deformation position L and the value of load P/displacement S, and to express them as a comprehensive numerical value.

Next, an embodiment of an apparatus for carrying out the method of the present invention will be described with reference to FIGS. 3 and 4. A support arm 22 is erected at both ends of the measurement base 21, and support arms 23 project horizontally from the support arm 22, and each roller 2 has a club support groove 24 having a U-shaped cross section.
5 is supported. In this embodiment, the club 11 is fitted into the club support groove 24 from below the support arm 23, and the club 11
This gives an upward deformation to .

A feed screw shaft 26 is rotatably supported on the measurement base 21 so as to extend between the lower parts of the left and right columns 22. At one end of this screw shaft 26, a rotation operation handle 26a is attached. is provided. This feed screw shaft 26 is screwed into a moving base 27, and the moving base 27 is connected to the feed screw shaft 26.
The measuring base 21 is supported by a guide 28 parallel to the measuring base 21 so as to be movable straight in the same direction.

A weighing table 31 to which a spring weighing scale 30 is fixed is supported on the movable table 27 so as to be movable up and down. This scale stand 31
A height adjustment screw 32 is screwed into the fixed column 3 fixed on the movable table 27.
3 is screwed together. Therefore, when the height adjustment screw 32 is rotated via its rotation knob 32a, the scale table 31 moves up and down.

The spring balance 30 is provided with a roller 36 having a club support groove 35 having a U-shaped cross section on the article mounting plate 34 thereof. This roller 36 presses and deforms the club 11 from below to above. The scale stand 31 is provided with a pointer 37, and the fixed column 33 is provided with a scale 38 that the pointer 37 points to. The pointer 37 and scale 38 provide a guideline for the amount of displacement to be applied to the club 11. Further, the measurement base 21 and the movable table 27 are provided with a similar scale 39 and pointer 40. The scale 39 and the pointer 40 are used to detect the maximum deformation position L.

In this device having the above structure, both ends of the club 11 are fitted into the club support grooves 24 (support parts 12, 13) of the left and right rollers 25 from below, and the middle part of the club 11 is inserted into the club support grooves 24 (support parts 12, 13) of the left and right rollers 25. Fit into the upper side of the groove 35. In this state, when the height adjustment screw 32 is turned via the rotation knob 32a to raise the scale stand 31, the club 11 is deformed, and the scale 30a of the spring scale 30 indicates the load applied to the club 11 at that time. shows. The amount of displacement of the club 11 determined by the vertical position of the scale table 31 is set with the aim of not leaving any permanent distortion in the club 11 and clearly detecting the position where it is most likely to deform. Specifically, the distance from the reference height position h is preferably about 15 to 35 mm. If the amount of displacement is too small, the position of maximum deformation cannot be detected accurately.

After determining the amount of displacement of the club 11, next,
The feed screw shaft 26 is rotated via the handle 26a. Then, the moving table 27, that is, the spring scale 30 and the weighing table 31
The whole of the club 11 moves in the axial direction, and the amount of displacement of the club and the load at that time change along the longitudinal direction of the club 11. FIG. 5 shows the displacement S of the club 11 and the spring scale 3.
This shows an example of actual measurement of the load P at zero. club 11
In the graph of Figure 5, the part that is most easily deformed is 3
Curves A, B showing measurement results for book club 11,
The bottoms of C are represented as a, b, and c. Therefore, by detecting the distances of the bottom portions a, b, and c from the reference position, the maximum deformation position L can be determined.

Furthermore, the load P/displacement amount S can be easily calculated from this graph. Therefore, the hardness of the club 11 can be evaluated based on the maximum deformation position L and the load P/displacement amount S. As mentioned above, it can be expressed by displacement amount S/load P, but this is a modified example of load P/displacement amount S.

The amount of displacement of the club 11 can be detected, for example, by protruding a measuring needle from a part of the article mounting plate 34 of the spring scale 30, and mechanically or electrically detecting the displacement of the measuring needle. It can be measured by In addition, the rotational drive of the feed screw shaft 26 is powered, and the club 1
The displacement amount of 1 and the load at that time can also be detected as an electrical quantity. In this way, by electrically detecting the amount of variation, the maximum deformation position L and the load P/displacement amount S can be automatically calculated.

In the above embodiment, the spring scale 30 is shown as a load applying device that applies a deforming load to the club 11, but the load can be applied to the club 11 by other means, such as a load cell. In other words, the spring scale 30 is placed on the scale stand 31.
Instead, it is possible to mount a load cell and apply a certain amount of deformation to the club 11 via the load cell. Unlike spring scales, load cells do not change the position of the applied force, so
A constant amount of displacement can be applied to the club 11, and the load at that time can be directly measured. That is, in the calculation of the load P/displacement amount S described above, since the displacement amount S is constant and only the load P changes, the calculation can be performed more easily.

[0026]

As described above, according to the method of the present invention, the hardness of a golf club can be evaluated using an evaluation method different from conventional evaluation methods. In particular, since the position where deformation is most likely to occur can be quantitatively detected, new hardness evaluations are possible. Furthermore, by calculating the load per unit displacement at the position where deformation is most likely to occur, it is possible to evaluate the hardness that combines the position where deformation is most likely to occur and the load required to cause unit deformation, which is different from the conventional evaluation method. It is possible to give evaluations that are close to human sensations, which cannot be expected with other systems. Moreover, according to the apparatus of the present invention, the method of the present invention can be carried out easily and reliably.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram depicting the principle of the golf club hardness measuring method according to the present invention using a skeleton.

FIG. 2 is a similar explanatory diagram of golf clubs having different hardnesses.

FIG. 3 is a front view showing an embodiment of the golf club hardness measuring device of the present invention.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a graph showing an example of measurement by the golf club hardness measuring device of the present invention.

[Explanation of symbols]

11 Golf club 12 13 Support part 21 Measurement base 22 Post 23 Support arm 24 Club support groove 25 Roller 26 Feed screw shaft 27　Movement platform 30 Spring scale 31 Weigh stand 32 Height adjustment screw 33 Fixed pillar 34 Article placement tray 35 Club support groove 36 Roller

Claims (7)

[Claims] Claim 1: Both ends of a golf club are supported at a reference height, and a load is sequentially applied to the golf club in the longitudinal direction from a direction approximately perpendicular to the longitudinal direction of the golf club to cause elastic deformation. Detect the maximum deformation position in the length direction where the deformation is the largest, calculate the ratio between the load at this maximum deformation position and the amount of displacement from the reference height at that time, and calculate the maximum deformation position and the load/displacement amount. A golf club measuring method characterized by expressing the hardness of a golf club using. Claim 2: In claim 1, the maximum deformation position is L.
, when the load/displacement amount is P/S, the hardness H of the golf club is expressed as a function of L and P/S, H=f(L, P/S). 3. Both ends of a golf club are supported at a reference height, and a load is sequentially applied to the golf club in the longitudinal direction from a direction approximately perpendicular to the longitudinal direction of the golf club to cause it to elastically deform. 1. A method for measuring a golf club, comprising: detecting a maximum deformation position in the longitudinal direction where the deformation is greatest, and expressing the hardness of the golf club based on this maximum deformation position. 4. Both ends of a golf club are supported at a reference height, and a load is sequentially applied to the golf club in the longitudinal direction from a direction approximately perpendicular to the longitudinal direction of the golf club to cause it to elastically deform. It is characterized by detecting the maximum deformation position in the length direction where the deformation is greatest, and expressing the hardness of the golf club using the ratio of the load at this maximum deformation position and the amount of displacement from the reference height at that time. How to measure golf clubs. 5. Measurement base; a pair of support parts provided on this measurement base to support both ends of the golf club; A load applicator that applies an elastic deformation load to a golf club that is movably supported and held between the pair of support parts; A feeding device that provides movement in the axial direction to this load applicator; Movement of this load applicator. A hardness measuring device for a golf club, comprising: a position detector for detecting the position; and means for detecting the position of the force applying point of the load applying device on the golf club and the load by the load applying device. 6. The golf club hardness measuring device according to claim 5, wherein the load applying device is adjustable in position in a direction perpendicular to a reference height connecting the pair of support parts. 7. The golf club hardness measuring device according to claim 6, wherein the load applying device is a spring scale.