JPH0512951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a measuring device for measuring the mechanical properties of a golf club. The present invention relates to a golf club measuring device capable of measuring moment of inertia.

(Prior art and its problems) Measuring devices for measuring the moment of inertia around the grip end of a golf club have been known for a long time. As disclosed in
The grip side end of the golf club is pivotally held and the head side of the golf club is suspended downward. On the other hand, measuring machines for measuring deflection characteristics such as the amount of deflection and the stiffness point of a golf club are also known, but such deflection characteristic measuring machines generally support one end of the golf club almost horizontally and the other end. It is configured to apply a load to the side.

As mentioned above, the supporting posture of the golf club is different between the conventional moment of inertia measuring machine and the deflection characteristic measuring machine. It was necessary to change the supporting position of the machine, which caused the work to be troublesome.

In view of the above problems, an object of the present invention is to provide a golf club measuring device that can support a golf club substantially horizontally and measure the moment of inertia around the end of the grip.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a structure in which the grip-side end of the golf club can be pivoted on a club support stand provided at one end of the machine. A supporting club pivot is provided, and a measuring table provided at the other end of the machine is used to flex the golf club at a point near the head of the golf club so that the golf club is in a substantially horizontal supporting position. and a vibration measuring section that measures the frequency or period of vibration of the golf club when vibration is applied to the golf club in the direction in which the spring force acts using the club pivot as a fulcrum, Furthermore, on the stand,
2 for supporting one end of the golf club at two points so that the golf club is in a nearly horizontal support position.
A point support part is provided, and the measuring table further includes a load applying device that applies a load to a location near the free end of the golf club supported by the two-point support part to deflect the golf club; Provided is a golf club measuring device characterized in that it is provided with a deflection measuring section that measures the amount of deflection of the golf club.

(Function) According to the above means according to the present invention, it is possible to measure the moment of inertia around the end of the grip while the golf club is supported almost horizontally using the spring force. It becomes possible to measure the moment of inertia in a similar support posture. Therefore, the work of measuring golf clubs becomes easier.

Furthermore, it becomes possible to measure the moment of inertia and deflection characteristics of a golf club with a single measuring device without changing the supporting posture of the golf club and without requiring a large work space.

In a further preferred embodiment of the invention, the club pivot is optionally configured to pivotably support the grip end of the golf club and to securely grip the grip. ing. Therefore, the grip part of the golf club is fixedly gripped by the club pivot part, the golf club is placed in a substantially horizontal position, and the vibration frequency or vibration period when bending vibration is applied to the golf club is measured by the vibration measuring part. Therefore, the natural frequency of the golf club can be measured in the same supporting posture as the supporting posture when measuring the moment of inertia.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 show one embodiment of the present invention. First, referring to FIGS. 1 and 2, the golf club measuring machine includes a graph support stand 12 fixed to one end side of a machine stand 11. As shown in FIGS. The support base 12 is provided with a club pivot 14 that pivotally supports the grip side end of the golf club 13. The club pivot 14 includes a fixed clamp member 15 fixed to a support base 12 and a movable clamp member 1 attached to a jack up device 16.
7. The club pivot portion 14 is capable of pivotally supporting the golf club 13 by gripping the grip-side edge of the golf club 13 between the clamp members 15 and 16 with a relatively weak force. By strongly gripping the grip portion of the golf club 13 with both clamp members 15 and 16, the golf club 13 can be firmly fixed and supported.

The club support stand 12 further includes a golf club 1
The golf club 1 is held so that the golf club 3 is in a substantially horizontal position.
A two-point support portion 18 is provided for supporting the grip side or head side of the grip at two points. The two-point support part 18 is a first support part that supports the lower surface of the golf club 13.
The golf club 13 includes a lower support pin 19 and an upper support pin 20 that supports the upper surface of the golf club 13. The position of the lower support pin 19 can be adjusted in the vertical direction by a screw mechanism 21, so that the supporting posture of the golf club 13 can be finely adjusted.
The support base 12 includes a grip stopper 22 for positioning the golf club 13 by contacting the grip end of the golf club 13 supported by the two-point support part 18 , and a grip stopper 22 for positioning the golf club 13 by contacting the grip end of the golf club 13 supported by the two-point support part 18 . a head stopper 2 for positioning the golf club 13 by bringing it into contact with the head of the golf club 13;
3 is provided.

Referring to FIGS. 1 and 3, a measuring stand 24 is provided on the other end side of the machine stand 11 so that its position can be adjusted. The machine stand 11 is provided with a scale 11a that is used when positioning the measuring stand 24. Note that it is desirable to set the center of the support pin 19 of the two-point support part 18, the grip end at the time of moment of inertia measurement, and the zero scale of the scale 11a to be located on the same straight line.

The measuring table 24 has the grip end attached to the club pivot 1.
a spring 25 for resiliently supporting the golf club 13 at a location near the head thereof so that the golf club 13 supported by the golf club 4 assumes a substantially horizontal support posture;
is provided.

Further, the measuring table 24 is provided with a vibration measuring section 26 for measuring the frequency or period of vibration of the golf club 13 supported by the club pivot 14 and the spring 25. The vibration measuring section 26 includes a light emitting element 27
and a light receiving element 28. Clough Cardinal Branch 1
When vibration is applied to the golf club 13 in the direction in which the spring force is applied using 4 as a fulcrum, the golf club 13 periodically blocks the light rays directed from the light emitting element 27 to the light receiving device 28, so that the vibration period of the golf club 13 is changed from the light receiving element 28 to the golf club 13. A corresponding pulse signal output can be obtained. This pulse signal is sent to the controller 29.

Note that the vibration measuring section 26 is also used when measuring the fixed frequency of the golf club 13. That is, when the golf club 13 is flexed and vibrated while the grip side end of the golf club 13 is firmly gripped between the clamps 15 and 17 of the club pivot 14, the golf club 13 periodically moves from the light emitting element 27 to the light receiving element. Since the light beam directed toward 28 is blocked, a pulse signal output corresponding to the flexural vibration period of the golf club 13 can be obtained from the light receiving element 28.

The measuring table 24 is further provided with a load applying device 30 that applies a load to a location near the free end of the golf club 13 supported by the two-point support portion 18 to cause the golf club 13 to bend downward. The load applying device 30 includes an elevating body 32 that includes a contact 31 that can come into contact with the upper surface of the golf club 13. The elevating body 32 is provided with a motor 33, and a pinion 34 driven by the motor 33 is engaged with a rack 35 erected on the measuring table 24.
When the pinion 34 is rotated by the motor 33, the elevating body 32 moves vertically along the rack 35.

Between the measuring table 24 and the elevating body 32, the elevating body 3
A potentiometer 36 is provided as a deflection measuring section that extends as the arm 2 is lowered. The potentiometer 36 detects the amount of movement of the elevating body 32 and sends an output signal corresponding to the amount of movement to the controller 29.

The elevating body 32 is provided with a load cell 37 connected to the contactor 31. The load cell 37 is
When the contact 31 is brought into contact with the golf club 13 and the golf club 13 is deflected, the magnitude of the reaction force applied to the contact 31 is detected and an output signal is sent to the controller 29.

In the golf club measuring machine having the above configuration, when measuring the moment of inertia of the golf club 13, as shown in FIG.
7, and the portion of the golf club 13 near the head is elastically supported by a spring 25.
As a result, the golf club 13 is attached to the clamp member 1.
It is supported so as to be pivotable in the direction of the spring force using the support portions 5 and 17 as fulcrums.

The moment of inertia of the golf club 13 can be determined by the following equation.

I=I _C {F _C ×l/l _C ×F} ² ...(1) In the above formula, I: Moment of inertia of the club I _C : Moment of inertia of the reference pipe F: Measured frequency of the club F _C : Reference Measured vibration frequency of the pipe l: Distance from the grip end fulcrum of the club to the spring l _C : Distance from the grip end fulcrum of the reference pipe to the spring. The process leading to the above (1) will be explained below.

To find the moment of inertia around one end of a rod such as a golf club, one end of the rod can be pivoted as shown in Figure 4, and a spring 2 is used to position the rod at an appropriate position.
5, the rod body is vibrated around the point pivoted by clamps 15 and 17, and the frequency of vibration is measured and determined by the following equation (4).

Here, T: Period F: Frequency l: Distance from the pivot fulcrum to the position where the spring is applied K: Spring constant I: Moment of inertia of the rod, T=1/F...(3) From (2) and (3) In the above measurement method, it is necessary to select a spring that gives appropriate vibrations to the rod, but even if a spring is determined, it takes many man-hours to measure the spring constant of the determined spring.

Therefore, it has been considered to use a member whose moment of inertia value can be obtained simply by calculation, that is, a reference pipe, to obtain the moment of inertia of the rod without using the value of the spring constant.

That is, the moment of inertia is determined using the same spring used for measurement using the above measurement method for the reference pipe.

Here, regarding the reference pipe, M: Weight L: Length, then the moment of inertia I _G around the center of gravity of the reference pipe is I _G = ML ² /12 The moment of inertia I _C around one end of the reference pipe is I _C = I _G +M{L/12} ² I _C =1/3ML ² ...(5) The formula for determining the moment of inertia I _C for a spring is by applying the above formula (4), I _C = K _C {l _C /2πF _C } ² ...(6).

In addition, K _C : Spring constant F _C : Frequency of vibration of the reference pipe l _C : Position of the reference pipe where the spring is applied The measured spring constant in the case of the above equation (4) and the spring constant in the equation (6) are the same. In the case (if both springs with the same spring constant are used), K = K _C , and from (4) K = I {2πF / l} ² From (6), K _C = I _C {2πF _C /l _C } ² , so I{2πF/l} ² = I _C {2πF _C /l _C } ² I=I _C {F _C ×l/l _C ×F} ² ...(7), and equation (7) becomes Consistent with (1), the value of I _C is obtained from equation (5), so the moment of inertia of the club can be obtained from equation (1). By applying the measured value of the frequency F measured by the vibration measuring section 26 to the above equation, the moment of inertia I of the golf club 13 can be determined. This calculation is performed by controller 2.
This can be performed by a CPU (not shown) in 9. The calculated measured value of the moment of inertia I is displayed on a display section 38 provided in the controller 29.

When measuring the natural frequency of the golf club 13, as shown in FIG. The vibration frequency of the golf club 13 is determined by the detection signal from the vibration measuring section 26. The measured value of the natural frequency can be displayed on the display section 38 provided in the controller 29.

When measuring the amount of deflection of the golf club 13, as shown in FIG.
The motor 33 is operated to lower the elevating body 32 of the load applying device 30, and the contact 31 is brought into contact with a portion of the golf club 13 near the head, thereby bending the golf club 13 downward. contact 3
A reaction force against the load applied to the golf club 13 acts on the golf club 13, and the magnitude of this reaction force is detected by the load cell 37. The amount of deflection of the golf club 13 when a predetermined load is applied to the golf club 13 is measured by the detection signal of the potentiometer 36, and the measured value is displayed on the display section 38 of the controller 29.
It can be displayed by

As shown in FIG. 7, the golf club 13 is supported by the support pins 19 and 20 of the two-point support part 18 on the head side, and the amount of deflection is measured when a predetermined load is applied by the load applying device 30. From this and the amount of deflection when the grip side of the golf club 13 is supported and deflected, it is possible to measure the bending point of the golf club 13, that is, the maximum point of the deflection curvature. Characteristics can be investigated.

Although the illustrated embodiments have been described above, the present invention is not limited to the aspects of the above embodiments. For example, when measuring the moment of inertia of a golf club 13, an adapter 4 as shown in FIG.
0 may be provided between the clamp members 15 and 17, and the grip side end of the golf club 13 may be supported by the adapter 40. Additionally, the club pivot 18 may have other club gripping structures, such as a screw-in type or the like. Furthermore, the spring 25 may be attached directly to the fixed part of the measuring part 24.

(Effects of the Invention) As is clear from the above description, according to the present invention, the moment of inertia around the end of the grip can be measured while the golf club is supported almost horizontally using the spring force. The moment of inertia can now be measured in the same supporting position as the golf club at the time. Also 2
The amount of deflection of a golf club can be measured by applying a load to a point near the free end of the golf club supported by a point support, so a single measuring device can measure the amount of deflection of the golf club without changing the supporting posture of the golf club. The moment of inertia and deflection characteristics of a golf club can be measured without requiring any work space. Therefore, it is possible to provide a golf club measuring machine that can easily perform measurement work for different types of golf clubs.

[Brief explanation of drawings]

Fig. 1 is a front view of a golf club measuring machine showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, of the measuring machine shown in Fig. 1, and Fig. 3 is shown in Fig. FIG. 1 is a sectional view taken along the line in FIG. 1, FIGS. 4 to 7 are diagrams each showing a measuring method using the measuring device shown in FIG. 1, and FIG. 8 is a golf club showing another embodiment of the present invention. It is a sectional view of the main part of a measuring machine. 11...Machine base, 12...Club support stand, 13...
...Golf club, 14...Club branch, 15,
17... Clamp member, 18... Two-point support part, 1
9, 20...Support pin, 24...Measuring table, 25...
... Spring, 26 ... Vibration measuring section, 29 ... Controller, 30 ... Loading device, 31 ... Contactor,
32... Elevating body, 36... Potentiometer, 3
7...Load cell.

Claims (1)

[Scope of Claims] 1. A club support stand provided at one end of the machine base is provided with a club pivot for pivotally supporting the grip side end of the golf club, and the other end of the machine base On the measuring stand installed on the side,
A spring elastically supports the golf club at a location near the head of the golf club so that the golf club is in a substantially horizontal support position, and a vibration is applied to the golf club in the direction in which the spring force acts using the club pivot as a fulcrum. a vibration measuring unit for measuring the vibration frequency or vibration period of the golf club at the time of the golf club, and the club support base further includes a vibration measuring unit that measures one end of the golf club so that the golf club is in a substantially horizontal supporting position. A two-point support section for point support is provided, and the measurement table further includes a load that causes the golf club to bend by applying a load to a portion near the free end of the golf club supported by the two-point support section. A golf club measuring machine characterized by being provided with a applying device and a deflection measuring section that measures the amount of deflection of a golf club. 2. the club pivot selectively pivotally supports the grip end of the golf club;
The golf club measuring device according to claim 1, wherein the golf club measuring device is formed so that the grip portion can be fixedly gripped. 3. The golf club measuring machine according to claim 1, wherein the club support stand or the measuring stand is positionally adjustable with respect to the machine stand in the direction of the golf club support posture.