JP2005000564A - Golf club measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately measure the natural vibration frequency of a golf club by a simple structure and to measure the weight, swing weight and natural vibration frequency of the golf club with a single instrument. <P>SOLUTION: One end side of an action plate 2 where a clamper 3 is arranged is supported by a supporting member 7, the other end side is supported by a measuring base 4 provided with a load cell, the action plate is vibrated by giving vibrations to the shaft of the clamped golf club, and the natural vibration frequency of the golf club is measured by the output signal of the load cell by the vibrations. Also, the action plate is supported by a first supporting member 5 and a second supporting member 6 capable of canceling support and the measuring base provided with the load cell, the swing weight is measured by canceling the support of the first supporting member, the weight is measured by canceling the support of the first supporting member and the second supporting member, and the natural vibration frequency is measured by canceling the support by the second supporting member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for measuring a natural frequency which is a characteristic value of a golf club, and further relates to an apparatus capable of simultaneously measuring the weight, swing weight and natural frequency of a golf club.
[0002]
[Prior art]
A golf club has a head attached to the tip of the shaft and a grip attached to the base. The characteristics of the golf club include its weight and the weight of the club that is felt on the wrist when the grip is held (swing weight). In addition, the shaft is expressed as a hard shaft or a soft shaft, but the characteristic value such as the vibration (natural frequency) of the shaft when the club is shaken is also important as representing the hardness of the shaft. A hard shaft vibrates with a small amplitude and thus exhibits a large natural frequency, while a soft shaft is the opposite.
[0003]
As described above, the swing weight represents the weight of the club felt on the wrist or the like when gripping the grip, and a 5-inch measurement method, a 12-inch measurement method, a 14-inch measurement method, and the like are performed. For example, when measuring by the 14-inch measurement method, when the club is held with the position of 14 inches from the grip end of the club as a fulcrum, and the force F that balances the club is applied to the grip end, the swing weight K is 14 × F. Can be sought.
Then, the value of K is roughly classified into A to F from the lighter one, and each major classification is further classified into 10 into 0 to 9, and the weight of the club felt on the wrist or the like when gripping the grip is, for example, D5. Is displayed. Based on this display, the user can select the optimum swing weight club according to his / her power.
[0004]
[Problems to be solved by the invention]
As described above, these characteristic values are important factors in designing a golf club. Therefore, various apparatuses for measuring these characteristics have been proposed and put into practical use. Since the weight of the golf club and the swing weight are basically obtained by measuring the weight, usually both can be measured with one measuring device. On the other hand, the natural frequency is measured with a phototube or a stroboscope while holding one end of the club and giving vibration to the shaft, which increases the size and cost of the device, and does not increase the amplitude of the shaft. There was a problem that could not be measured accurately. Further, it is often a dedicated device for measuring the natural frequency, and therefore two measuring devices are required to measure the weight, swing weight, and natural frequency of the golf club.
[0005]
Accordingly, a first object of the present invention is to provide a golf club characteristic measuring apparatus capable of accurately measuring a natural frequency of a golf club with a simple structure, and a second object is to have a simple structure. An object of the present invention is to provide a golf club characteristic measuring device capable of measuring the weight, swing weight and natural frequency of a golf club with a single device.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention of claim 1 is characterized in that one end of a working plate on which a clamper is arranged is rotatably supported by a support member, and the other end is supported by a measuring table having a load cell. When the grip portion of the club is clamped with a clamper and a vibration is applied to the shaft of the golf club, the action plate vibrates, and the natural frequency of the golf club is measured from the output signal of the load cell due to this vibration.
[0007]
According to the second aspect of the present invention, the first end of the action plate on which the clamper is disposed is rotatably supported by the first support member capable of releasing the support, and the action plate can be unsupported at a predetermined reference position of the action plate. 2 Supported by a support member, the other end of the working plate is supported by a measuring table having a load cell, the grip portion of the golf club is clamped by a clamper, the support of the first support member is released, and the support is supported by the second support member The swing weight of the golf club is measured based on the output signal of the load cell in the finished state, the weight of the golf club is measured based on the output signal of the load cell in the state where the support of the first support member and the second support member is released, and the first support member In the state where the support by the second support member is released, the golf club shaft is vibrated to vibrate the action plate, and the load cell is released by the vibration. Signal by measuring the natural frequency of the golf club.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings. 1 to 3 show an apparatus capable of measuring weight, swing weight and natural frequency, FIG. 1 shows a state in which weight is measured, FIG. 2 shows a state in which swing weight is measured, and FIG. Indicates the state of measuring the natural frequency. 1 to 3, a working plate 2 is disposed on a base 1, and a clamper 3 including a pair of gripping members that are opened and closed is disposed on the working plate 2. The action plate 2 is supported by a measurement table 4, a first support member 5 and a second support member 6 arranged on the base 1. Although not shown, a control box is arranged on the base 1.
[0009]
The measuring table 4 has a built-in load cell, and is attached to the end of the action plate 2 by a pin 42 so as to be rotatable. The measuring table 4 is provided with a stopper 41. As will be described later, when the support by the first support member 5 and the second support member 6 is released, the action plate 2 slightly rotates and contacts the stopper 41 as shown in FIG. That is, the action plate 2 is supported only by the measurement table 4.
[0010]
The first support member 5 is composed of an arc-shaped cam. As shown in FIG. 3, when the arc-shaped cam surface comes into contact with the action plate 2, the first support member 5 supports the action plate 2, and as shown in FIGS. The support is released when the cam surface is separated from the action plate 2 by rotating. The side plate 11 attached to the base 1 is provided with a rotatable holding member 51. When the first support member 5 comes into contact with the action plate 2, the action plate 2 rises slightly and the end plate 21 of the action plate 2. Is in contact with the restraining member 51, and the end of the action plate 2 is restrained by the restraining member 51. That is, the end portion of the action plate 2 is rotatably supported by the first support member 5 and the holding member 51.
[0011]
The second support member 6 is also formed of an arc-shaped cam. As shown in FIG. 2, the cam surface abuts on a protrusion 61 provided at a reference position on the lower surface of the action plate 2 to support the action plate 2. As shown in FIGS. 1 to 3, the support of the action plate 2 is released by rotating and the cam surface being separated from the projection 61. The position of the protrusion 61 is a position where the distance from the end of the grip part G clamped by the clamper 3 is 14 inches (about 356 mm) when the swing weight is measured by, for example, a 14-inch measurement method.
[0012]
Therefore, when measuring the weight of the golf club GC, as shown in FIG. 1, the support by the first support member 5 and the second support member 6 is released and the action plate 2 is supported only by the measurement table 4. . When the grip part G is clamped by the clamper 3, the weight measured by the load cell of the measuring table 4 is increased by the weight of the golf club GC compared to before clamping, and the weight of the golf club GC is obtained from the increase. Can do. The output signal of the load cell is amplified by an amplifier in the control box to become an analog output of 0 to 5 V. This output is A / D converted and calculated by the CPU unit, and the result is displayed on the screen.
[0013]
When measuring the swing weight, the action plate 2 is supported by the second support member 6 and the measurement table 4 as shown in FIG. Then, a value obtained by multiplying the distance from the grip end to the protrusion 61 (for example, 14 inches) by the weight value measured by the load cell can be calculated by the CPU unit.
[0014]
When obtaining the natural vibration value, the working plate 2 is supported by the first support member 5 and the measurement table 4 as shown in FIG. Then, the head H of the club GC clamped by the clamper 3 is held down and displaced downward, and when the hand is released, the shaft S makes a single vibration. Then, the action plate 2 vibrates with the vibration of the shaft S, and the load cell of the measuring table 4 detects this vibration and outputs a signal. For this signal, for example, digital waveform data measured through the same circuit as the above weight measurement is subjected to waveform analysis such as Fourier transform by the CPU unit, and the result is displayed on the screen to obtain the natural frequency. be able to. Alternatively, the natural frequency can also be obtained by using a comparator circuit, directly converting a waveform based on the output signal of the load cell into a pulse wave, and counting by the CPU unit.
[0015]
In this way, it is possible to quickly determine the weight, swing weight, and natural frequency of the club GC with a single device. And since the natural frequency is obtained using a load cell without using a phototube or stroboscope, it is possible to detect minute displacement efficiently and accurately measure it, and it is possible to reduce the size. Can be manufactured at low cost.
[0016]
Next, FIG. 4 shows a measuring device dedicated to the natural frequency. The action plate 2 is arranged on the base 1, and the action plate 2 is arranged with a clamper 3 made up of a pair of gripping members that are opened and closed in the same manner as in the measurement apparatus. The action plate 2 is supported by the measurement table 4 and the support member 7 disposed on the base 1, but one end of the action body 2 is held by the support member 7 so as to be more rotatable by a pin 71. The other end is rotatably held on the measuring table 4 by a pin 42. Then, the head H of the club GC clamped by the clamper 3 is held down and displaced downward. When the hand is released, the shaft S vibrates, and the action plate 2 vibrates accordingly, and this vibration is measured. It is the same as that of the said apparatus that the load cell of the stand 4 detects and a natural frequency is calculated | required.
Even in this device, the natural frequency is obtained by using a load cell without using a phototube or stroboscope, so that a minute displacement can be detected efficiently and measured accurately, and the size can be reduced. It is possible and can be manufactured at low cost.
[0017]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, the action plate vibrates with the vibration of the shaft of the golf club, and this vibration is detected by the load cell of the measuring table, so that the natural frequency is obtained. A minute displacement can be detected efficiently, the natural frequency can be measured accurately, and further downsizing and manufacturing can be performed at low cost. Further, according to the invention of claim 2, the weight and swing weight can be measured with one apparatus having a simple structure.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a state in which a weight is measured according to an embodiment of claim 2;
FIG. 2 is an embodiment of claim 2 and is an explanatory view showing a state in which a swing weight is measured.
FIG. 3 is an explanatory view showing a state in which the natural frequency is being measured according to an embodiment of claim 2;
FIG. 4 is an illustration of an embodiment of claim 1.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 11 Side plate 2 Action plate 21 Side plate 3 Clamper 4 Measuring stand 41 Stopper 42 Pin 5 1st support member 51 Holding member 6 2nd support member 61 Protrusion 7 Support member 71 Pin GC Golf club G Grip part S Shaft H Head

Claims (2)

One end side of the working plate on which the clamper is arranged is rotatably supported by a support member, and the other end side is supported by a measuring table having a load cell,
The grip part of a golf club is clamped by the clamper, and when a vibration is applied to the shaft of the golf club, the action plate vibrates, and the natural frequency of the golf club is measured by an output signal of the load cell due to the vibration. A golf club measuring device. One end side of the action plate on which the clamper is disposed is rotatably supported by a first support member that can be unsupported, and the action plate is supported by a second support member that can be unsupported at a predetermined reference position of the action plate. , The other end of the working plate is supported by a measuring table having a load cell,
Clamp the grip of the golf club with the clamper,
The swing weight of the golf club is measured from the output signal of the load cell in a state where the support of the first support member is released and the second support member is supported.
The weight of the golf club is measured by the output signal of the load cell in the state where the support of the first support member and the second support member is released, and is supported by the first support member, and the golf club is released from the support by the second support member A golf club measuring apparatus characterized in that when a vibration is applied to the shaft of the golf club, the action plate vibrates, and a natural frequency of the golf club is measured by an output signal of the load cell due to the vibration.

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