JP3917548B2 - Golf club measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for measuring a characteristic value of a golf club, and further relates to a device 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 (swing weight) that can be felt on the wrist when gripping the grip. 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 by a photoelectric tube, a stroboscope, etc. while holding one end of the club and applying vibration to the shaft, so that the device becomes larger and becomes a dedicated device for measuring the natural frequency. There are many cases. Therefore, two measuring devices are required to measure the weight, swing weight and natural frequency of the golf club.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a golf club characteristic measuring device that has a simple structure and can measure 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 the above object, a golf club measuring apparatus according to the present invention has a working plate arranged on a base, a club support portion for supporting a horizontally arranged golf club from below, and a grip of the golf club. A grip support portion that holds the end portion from above is disposed, and the action plate is first positioned at a reference position where the distance from the grip end of the golf club is the number of inches of a measurement method such as a 12-inch measurement method or a 14-inch measurement method . It is pivotally supported by the first holding base with a built-in load cell, placed on the second holding base with the second load cell on the club head side from the reference position, and has a built-in dynamic strain gauge . an inclined clamper a clip supporting the vicinity disposed on the base in the club support part side from the clip supporting portion, Gore the clamper toward the head to the second holder side In the state of unclamping the grip Fukurabu golf club is held at the club support and the grip support portion, weight and swing weight of the golf club is measured by the output signal of the first load cell and the second load cell, the grip clamper When the golf club is clamped, the golf club is inclined with respect to the horizontal plane, and the holding by the club support portion and the grip support portion is released, and the natural vibration of the golf club is measured by the output signal of the dynamic strain gauge by applying vibration to the golf club. .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a state in which the weight and swing weight are being measured, and FIG. 2 shows a state in which the natural frequency is being measured. 1 and 2, the action plate 2 disposed on the base 1 has a grip support portion 5 having a club support portion 4 that supports the shaft S of the club GC and a restraining portion 51 that suppresses the end portion of the grip G. Is arranged. The position of the club support portion 4 is closer to the grip G than the position of the center of gravity of the club GC. The action plate 2 is pivotally supported by the shaft 81 of the first holding base 8 at the reference position. When the swing weight is measured by the 14 inch measurement method, the position of the shaft 81 is a distance of 14 inches (about 356 mm) from directly below the end of the grip G. The gravity center of the action plate 2 is on the grip G side with respect to the shaft 81, that is, on the left side with respect to the shaft 81 in the drawing. Further, the end portion of the action plate 2 is placed on the protrusion 91 of the second holding base 9. The first holding table 8 incorporates a first load cell (not shown), and the second holding table 9 contains a second load cell (not shown). Therefore, the total weight of the action plate 2 and the object on which the load is applied to the action plate 2 is obtained from the sum of the weights measured by the first load cell and the second load cell.
[0008]
A holding wall 7 is erected on the base 1, and a clamper 6 that clamps the grip G is disposed on the holding wall 7. The clamper 6 includes a total of four gripping pieces 61 that are arranged to face each other, a cam 63 for opening and closing the opposing gripping pieces 61, and a lever 62 that rotates the cam 63. By rotating, the opposing gripping piece 61 opens and closes, and when the gripping piece 61 closes, the grip G is clamped. The gripping piece 61 includes a dynamic strain gauge (not shown). The dynamic strain gauge uses a piezoelectric film made of a polymer material as a piezoelectric element, and the generated potential is proportional to the magnitude of the strain, and its polarity corresponds to the direction of the strain. When the grip G is clamped, the club GC is slightly tilted and released from being held by the club support 4 and the grip support 5 as shown in FIG.
A control box 3 is arranged on the base 1, and each characteristic value is calculated based on output signals from the load cell and the dynamic strain gauge. The measured characteristic value is displayed on the display 31 of the control box 3. .
[0009]
When measuring the weight and swing weight of the club GC, the clamper 6 is unclamped and the club GC is held by the club support 4 and the grip support 5 as shown in FIG. As a result, the load applied to the first load cell of the first holding table 8 and the second load cell of the second holding table 9 through the action plate 2 is increased by the weight of the club GC. Therefore, the load is measured by the first load cell and the second load cell. The weight of the club GC can be obtained from the sum of the weights.
Next, the moment on the left side of the drawing from the shaft 81 as the fulcrum is the moment of the club GC (product of the reaction force received by the restraining portion 51 and the distance from the end of the grip G to the shaft 81), that is, the swing weight of the club GC. And the moment difference of the action plate 2 whose center of gravity is located on the left side of the shaft 81. The moment on the right side of the shaft 81 is measured by the distance between the shaft 81 and the protrusion 91 and the second load cell of the second holding base 9. Product of the weights to be measured, and the moments on the left and right of the shaft 81 are equal. Since the moment of the action plate 2 and the distance between the shaft 81 and the protrusion 91 are constant, the swing weight of the club GC can be obtained from the weight measured by the second load cell of the second holding base 9. Actually, if several tens of clubs with known swing weights are prepared in advance and the relational expression between gravity and swing weight measured by the second load cell is obtained, the swing weight can be easily obtained.
As described above, the weight of the club GC can be obtained from the weights measured by the first load cell of the first holding table 8 and the second load cell of the second holding table 9, and the swing weight of the club GC is determined by the second holding table 9. It can obtain | require from the weight measured with the 2nd load cell.
[0010]
Next, when obtaining the natural frequency, as shown in FIG. 2, when the lever 62 is rotated to the right side, the grip G is clamped by the clamper 6. At this time, as described above, the club GC is slightly inclined and released from being held by the club support portion 4 and the grip support portion 5.
Then, when the tip of the club GC is displaced about 10 cm downward by hand, for example, and the hand is released, the shaft S vibrates, but the potential is applied to the dynamic strain gauge built in the gripping piece 61 based on this vibration. Occurs. When this potential is plotted on the vertical axis and time is plotted on the horizontal axis, the output signal of the dynamic distortion meter draws a sinusoidal curve, which turns ON when the absolute value of the potential exceeds a predetermined value, for example, 2.5 mV, If converted to a pulse signal that is OFF if it is 2.5 mV or less, the natural frequency can be obtained from the number of pulses in a unit time.
[0011]
In this way, it is possible to quickly determine the weight, swing weight, and natural frequency of the club GC with a single device. In addition, the circuit board of the dynamic strain gauge can be shared with the circuit board of the load cell, that is, only one circuit board may be used in spite of measuring three characteristic values, and the number of parts is small. Cost can be reduced. Further, since the natural frequency is obtained by using a dynamic strain meter without using a phototube or a stroboscope, it is possible to reduce the size and to manufacture at a low cost. Conventionally, phototubes and stroboscopes measure the natural frequency at the shaft and head, but the present invention incorporates a dynamic strain gauge in the clamper that clamps the grip, so the obtained characteristic values actually hold the club. There is an advantage that you can get something close to what you feel.
[0012]
【The invention's effect】
As described above, the golf club measuring device according to the present invention includes a club support portion that supports a horizontally disposed golf club on a working plate disposed on a base, and an end portion of a grip of the golf club. A grip support portion is provided to hold the operation plate from above, and the action plate is pivotally supported by a first holding base incorporating a first load cell at a reference position, for example, 14 inches (about 356 mm) from the grip end. On the club head side, the golf club is placed on the second holding base containing the second load cell, the dynamic strain gauge is built in, the clamper for clamping the grip is arranged on the base, and the clamper is in the unclamped state. Is held by the club support portion and the grip support portion, and the weight and spin of the golf club are determined by the output signals of the first load cell and the second load cell. When the weight is measured and the grip portion is clamped by the clamper, the golf club is released from the holding by the club support portion and the grip support portion, and the golf club is vibrated to generate the natural vibration of the golf club by the output signal of the dynamic strain gauge. Since the number is measured, the structure is simple, and the golf club characteristic measuring device capable of measuring the weight, swing weight and natural frequency of the golf club with a single device can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a state in which weight and swing weight are being measured.
FIG. 2 is an explanatory diagram showing a state in which the natural frequency is being measured.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Action plate 3 Control box 31 Indicator 4 Club support part 5 Grip support part 51 Suppression part 6 Clamper 61 Holding piece 62 Lever 63 Cam 7 Holding wall 8 1st holding stand 81 Axis 9 2nd holding stand 91 Protrusion

Claims (1)

The action plate arranged on the base is provided with a club support portion for supporting the horizontally disposed golf club from below, and a grip support portion for holding the end of the grip of the golf club from above, and the action plate is In addition, the distance from the grip end of the golf club is pivotally supported by a first holding base incorporating a first load cell at a reference position that is the number of inches of a measurement method such as a 12-inch measurement method or a 14-inch measurement method. It is placed on the second holding base containing the second load cell on the club head side,
A dynamic strain gauge is built in, and a clamper whose axis is inclined with respect to the horizontal plane is disposed on the base in the vicinity of the clip support part and on the club support part side from the clip support part ,
When the clamper unclamps the grip of the golf club with the head facing the second holding base , the golf club is held by the club support portion and the grip support portion, and the outputs of the first load cell and the second load cell The weight and swing weight of the golf club are measured by the signal,
When the grip is clamped by the clamper, the golf club is tilted with respect to the horizontal plane, and the holding by the club support and the grip support is released, and the golf club is vibrated by the output signal of the dynamic strain gauge. A golf club measuring apparatus for measuring a natural frequency of a club.

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