JP2016202540A - Evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaluation method for a grip or a glove, capable of obtaining a result approximating to an evaluation performed by a human, and capable of performing a quantitative evaluation.SOLUTION: The evaluation method includes: a measurement step of using a golf club having a grip part provided with a multiaxial force sensor and an angular velocity sensor, to measure grip force and rotation torque; and an evaluation step of using an evaluation device to evaluate grip performance of an evaluation object. The evaluation object is a golf glove or a golf grip. The evaluation device includes an arrangement part on which the evaluation object can be arranged, a pressurization mechanism that can apply a vertical pressure onto the evaluation object, and a torque mechanism that can apply turning force to the evaluation object. The vertical pressure is determined on the basis of the grip force measured in the measurement step. The turning force is determined on the basis of the rotation torque measured in the measurement step.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for evaluating a golf grip or a golf glove.

  A golf clip is usually attached to the grip portion of the golf club. The grip is a contact point between the golfer and the golf club. Golf grip can affect the ease of swinging.

  A golfer usually wears a golf glove and swings. This golf glove is attached to a golfer's hand. This golf glove is interposed between a golfer and a grip. Golf gloves can affect the ease of swinging.

  Japanese Patent No. 543068 discloses a method for evaluating the grip force of a fabric. In this method, a shaft that can be rotated and / or moved is gripped by hand through the fabric, and the shaft is rotated and / or moved by an electric method.

  Japanese Patent Application Laid-Open No. 63-46180 discloses a grip evaluation apparatus. This apparatus includes a tightening mechanism that applies a force equivalent to a human gripping force to a grip portion of an evaluation object, a rotation imparting mechanism that imparts a rotational motion to the grip portion, and a measurement mechanism that measures the rotation angle of the grip portion. Have.

Japanese Patent No. 543068 JP-A-63-46180

  A human (golfer) swings a club equipped with a grip and performs sensory evaluation such as slipperiness. In addition, the human performs a sensory evaluation by swinging the club while wearing the golf glove. These sensory evaluations are not accurate because they are affected by the sense of the subject. In Patent Document 1 and Patent Document 2, quantitative evaluation is possible. However, the present inventor has found that there is room for improvement in this evaluation.

  An object of the present invention is to provide a grip or glove evaluation method capable of obtaining a result close to human evaluation and capable of quantitative evaluation.

The evaluation method according to the present invention includes the following steps.
(1) A measurement step of measuring a grip force in a swing operation and a rotational torque in the swing operation using a golf club provided with a multi-axis force sensor and an angular velocity sensor in the grip portion.
(2) An evaluation step for evaluating the grip performance of the evaluation object using the evaluation device.

  The evaluation object is a golf glove or a golf grip. The evaluation apparatus includes an arrangement unit that can arrange the evaluation object, a pressurizing mechanism that can apply a vertical pressure to the evaluation object, and a torque mechanism that can apply a rotational force to the evaluation object. doing. The vertical pressure is determined based on the grip force measured in the measurement step. The rotational force is determined based on the rotational torque measured in the measurement step. In the evaluation step, the evaluation is performed by applying the determined vertical pressure and the rotational force to the evaluation object.

  Preferably, the swing motion is a waggle.

  The swing motion may be a rotational motion. Preferably, the rotational center line of the rotational motion intersects the grip portion.

  Preferably, the rotational motion is a reciprocating motion with a rotational angle of 60 degrees or less.

  In this evaluation method, a result close to human evaluation is obtained, and quantitative evaluation is possible.

FIG. 1 is a right side view of a swing device that can be used in an embodiment of the present invention. FIG. 2 is an enlarged view of a club holding portion in the swing device of FIG. FIG. 3 is a perspective view showing the position of the rotation center line in the swing device of FIG. FIG. 4 is a perspective view showing gripping forces in three directions. FIG. 5 is a side view showing a grip end portion of a golf club according to another embodiment. FIG. 6 is a perspective view of an evaluation apparatus that can be used in an embodiment of the present invention. FIG. 7 is a graph showing an example of the measurement result of the angular velocity in the measurement step. FIG. 8 is a graph showing an example of the measurement result of the vertical pressure in the measurement step.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a right side view of a swing device 2 that can be used in the present invention. The swing device 2 includes a base 4, a main body 6, a tilting unit 8, a rotating unit 10, a club holding unit 12, and a control unit 14. The main body 6 is fixed to the upper side of the base 4. The tilting portion 8 can tilt with respect to the main body 6. In other words, the angle of the tilting part 8 with respect to the main body 6 can be adjusted. By adjusting this angle, the lie angle can be adjusted. In addition, the height of the base 4 is adjustable.

  The tilting unit 8 has a drive device. This driving device is built in the tilting portion 8. This drive device is a servo motor. The rotating unit 10 is rotated by this driving device. The rotation of the rotating unit 10 is controlled by the servo motor. The rotating unit 10 is connected to the driving device via a rotating shaft. A club holding unit 12 is fixed to the rotating unit 10. The control unit 14 controls the servo motor. The control unit 14 includes a position detector and a velocity detector. Position and velocity information is fed back from these detectors to achieve control. The swing is controlled by controlling the rotation.

  Thus, the swing device 2 can control the swing using the servo motor. As another swing device, a pendulum type swing device is exemplified. The swing of the pendulum type swing device is driven by gravity. As another swing device, an elastic body drive type swing device is exemplified. As this elastic body drive type swing device, for example, a device in which an elastic body is attached to the above-mentioned pendulum type swing device is exemplified. The acceleration and / or deceleration of the swing is achieved by utilizing the expansion and contraction of the elastic body. Examples of the elastic body include rubber and a spring.

  As shown in FIG. 1, a golf club 20 is attached to the swing device 2. The club holding unit 12 holds the golf club 20. When the rotating unit 10 rotates, the club holding unit 12 rotates and the club 20 rotates. In FIG. 1, what is indicated by a one-dot chain line is a rotation center line R1 as the center of rotation.

  The golf club 20 has a head 22, a shaft 24, and a grip 26. The head 22 is attached to the tip portion of the shaft 24. The grip 26 is attached to the rear end portion of the shaft 24.

  FIG. 2 is an exploded perspective view of the club holding unit 12. The club holding unit 12 holds the grip 26 of the club 20. The club holding part 12 has a first part 12a, a second part 12b, and a fastening body 12c. The fastening body 12c is a screw member. A plurality (four) of fastening bodies 12c are provided. Each fastening body 12c penetrates the first portion 12a and is screwed to the second portion 12b.

  The first portion 12a has a cavity a1. The shape of the cavity a1 corresponds to the shape obtained by dividing the grip 26 in half along the axial direction. The second portion 12b has a cavity b1. The shape of the cavity b1 corresponds to the shape obtained by dividing the grip 26 in half along the axial direction. The shape of the cavity a1 is the same as the shape of the cavity b1.

  As FIG. 1 shows, the grip 26 is arrange | positioned between the 1st part 12a and the 2nd part 12b. The grip 26 is sandwiched between the first portion 12a and the second portion 12b. More specifically, the grip 26 is sandwiched between the cavity a1 and the cavity b1. The fastening body 12c can adjust the space | interval of the 1st part 12a and the 2nd part 12b. The fastening body 12c can adjust the space | interval of the 1st part 12a and the 2nd part 12b. The grip 26 is fixed by being sandwiched between the first portion 12a and the second portion 12b.

  In the present application, the term “grip part G1” is used. In the club 20 of the present embodiment, the grip part G1 has a grip 26. The grip part G <b> 1 includes a grip 26 and a shaft 24 positioned inside the grip 26. The grip part G <b> 1 includes the outer surface of the grip 26.

  FIG. 3 is a perspective view showing the relationship between the grip part G1 and the rotation center line R1. As shown in FIG. 3, the rotation center line R1 intersects the grip part G1.

  As shown in FIG. 3, the grip part G1 is equally divided into three in the axial direction. In FIG. 3, what is indicated by a double arrow G11 is a butt portion of the grip portion G1. The butt portion G11 is the bat-side portion of the three parts. Bat portion G11 includes a grip end. In FIG. 3, what is indicated by a double-pointed arrow G12 is a central portion of the grip portion G1. In FIG. 3, what is indicated by a double arrow G13 is the tip portion of the grip portion G1. The chip part G13 is the most chip-side part among the three parts. The central portion G12 is a portion between the butt portion G11 and the tip portion G13.

  In the present embodiment, the rotation center line R1 intersects the central portion G12. The rotation center line R1 may intersect the butt portion G11. The rotation center line R1 may intersect the tip portion G13.

The present embodiment is an evaluation method including the following two steps.
(St1) A measurement step of measuring a grip force in a swing operation and a rotational torque in the swing operation using a golf club having a multi-axis force sensor and an angular velocity sensor in the grip portion.
(St2) An evaluation step of evaluating the grip performance of the evaluation object using the evaluation device.

  A typical example of grip performance is difficulty in sliding.

  The evaluation object is a golf glove or a golf grip. A golf glove and a golf grip may be evaluated simultaneously. The golf glove as the evaluation object may be a material (cloth, leather, etc.) constituting the golf glove. This material is used in the form of a sheet, for example. The golf grip as the evaluation object may be a material (rubber or the like) constituting the golf grip. This material is used in the form of a sheet, for example.

  In the measurement step st1, the subject of the swing motion is not limited. The subject of the swing motion may be a human (human) or a swing device as described above.

  The grip force in the swing motion is measured by a multi-axis force sensor.

  The multi-axis force sensor can measure forces in a plurality of axial directions. Examples of the multi-axis force sensor include a 3-axis force sensor and a 6-axis force sensor. A commercially available force sensor can be used. Examples of the force sensor measurement method include a strain gauge method and a capacitance method.

  The force sensor is disposed in the grip portion G1 of the golf club 20. The force sensor is arranged to measure the first force and the second force. The first force is normal pressure. The direction of this vertical pressure is perpendicular to the grip axis. This vertical pressure is a force from the outside of the grip toward the inside of the grip. The second force is a tangential force with respect to the circumferential direction of the grip portion G1. In the present application, this tangential force is also referred to as a circumferential shear force. The direction of the circumferential shear force is perpendicular to the direction of the normal pressure. Preferably, the grip force includes at least the vertical pressure. More preferably, the grip force further includes the circumferential shear force. More preferably, the grip force further includes an axial shear force.

  FIG. 4 is a conceptual diagram illustrating forces that can be exerted between the grip portion G1 and the human h1. This force can be broken down into force Fx, force Fy and force Fz in the xyz Cartesian coordinate system. The force Fx is a force along the x axis. The force Fy is a force along the y axis. The y axis is parallel to the central axis of the shaft 24. The force Fz is a force along the z axis.

  A force Fx, a force Fy, and a force Fz can act between the grip portion G1 and the human h1. The force Fy is perpendicular to the force Fx. The force Fz is perpendicular to the force Fx and perpendicular to the force Fy. The force Fx is the circumferential shear force described above. The force Fy is the above-described axial shear force. The force Fz is the vertical pressure described above. Preferably, the force sensor is arranged so as to measure the force Fz. More preferably, the force sensor is arranged so as to measure force Fx and force Fz. More preferably, the force sensor is arranged to measure force Fx, force Fy, and force Fz.

  The measurement position of the grip force may be the surface of the grip 26 or the boundary between the grip 26 and the shaft 24. A force sensor is arranged so that the force at the desired position can be measured.

  The force sensor may be embedded inside the shaft 24. The force sensor may be embedded in the grip 26. The force sensor may be disposed between the shaft 24 and the grip 26. The force sensor may be arranged so as to measure the force at the interface between the shaft 24 and the grip 26. The force sensor may be arranged so that a force on the surface of the grip 26 can be measured. The force sensor may be arranged so that a force on the inner surface of the grip 26 can be measured.

The rotational torque around the shaft axis is also simply referred to as rotational torque. The rotational torque in the swing operation is calculated based on the measured value by the angular velocity sensor. Angular acceleration is calculated from the measured angular velocity. When the angular acceleration is α and the inertia moment of the head is I, the rotational torque N is calculated by the following equation.
N = I x α

  The inertia moment I of the head is the inertia moment around the shaft axis of the head.

  The angular velocity sensor can measure an angular velocity about at least one axis. Preferably, the angular velocity sensor can measure angular velocities around a plurality of axes. A preferred angular velocity sensor can measure angular velocities about three axes.

  The angular velocity sensor is arranged so as to measure the angular velocity around the shaft axis. The angular velocity sensor may be provided inside the grip 26. The angular velocity sensor may be provided on the outer surface of the grip 26.

  FIG. 5 is an enlarged view of a grip end portion in a golf club according to another embodiment. This golf club has a sensor casing 40. The sensor casing 40 is provided in the grip part G1. The sensor casing 40 is attached to the grip end of the grip 26. The angular velocity sensor is accommodated in the sensor casing 40. Thus, the angular velocity sensor may be arranged using the sensor casing 40.

  The vertical pressure in the evaluation step is determined based on the grip force measured in the measurement step st1. As described above, the grip force includes the force Fz (FIG. 4). For example, the magnitude of the vertical pressure in the evaluation step can be the same as this force Fz.

  Based on the rotational torque measured in the measurement step st1, the rotational force in the evaluation step is determined. For example, the rotational force (moment) in the evaluation step can be the same as the rotational torque (moment) measured in the measurement step.

  In the evaluation step st2, the evaluation is performed by applying the determined vertical pressure and the rotational force to the evaluation object.

  FIG. 6 is a perspective view of the evaluation device 30 used in the above-described step st2 (evaluation step).

  The evaluation apparatus 30 includes an arrangement unit 32 that can arrange an evaluation object, a pressurizing mechanism 34 that can apply a vertical pressure to the evaluation object, and a torque mechanism 36 that can apply a rotational force to the evaluation object. Have. With this rotational force, a force based on the rotational torque is reproduced.

  The placement portion 32 is formed by a first portion 32a and a second portion 32b. The first portion 32a and the second portion 32b are substantially flat members as a whole. The first part 32a has a cavity part a1. This cavity part a1 is the same as the cavity part which the above-mentioned 1st part 12a has. The second portion 32b has a cavity portion b1. This cavity part b1 is the same as the cavity part which the above-mentioned 2nd part 12b has. The arrangement part 32 is configured by a cavity part a1 and a cavity part b1 facing each other. The grip 26 is sandwiched between the cavity part a1 and the cavity part b1. In this manner, the placement unit 32 can hold the evaluation target object.

  The pressurizing mechanism 34 includes the first portion 32a and the second portion 32b described above and the fastening body 32c. The fastening body 32c is a screw member. A plurality (four) of fastening bodies 32c are provided. Each fastening body 32c penetrates the first portion 32a and is screwed to the second portion 32b. By tightening the fastening body 32c, a vertical pressure is applied to the evaluation object.

  The torque mechanism 36 includes a shaft 36a, a shaft 36b attached to the shaft 36a, and a weight 36c attached to the shaft 36b. A grip 26 is disposed at the rear end of the shaft 36a. A shaft 36b is attached to the tip of the shaft 36a. The shaft 36b extends in a direction perpendicular to the axial direction of the shaft 36a. The weight 36c is attached at a position away from the shaft 36a by a predetermined distance. Gravity acting on the weight 36c gives a rotational moment about the shaft axis to the shaft 36a. Due to this rotational moment, torque is applied to the grip 26. This torque acts between the grip 26 and the cavity portions a1 and b1. As the shaft 36a, the above-described golf club shaft 24 may be used.

  In the embodiment of FIG. 6, the evaluation object is the grip 26. The evaluation object may be a golf glove. For example, the material constituting the golf glove may be wound around the grip 26. In this case, the golf glove and the grip can be evaluated simultaneously. Examples of the material constituting the golf glove include leather and cloth, and examples of the leather include artificial leather and natural leather.

  The material constituting the golf glove may be wound around the shaft 36a. Further, instead of the grip 26, a member having the same shape as the grip 26 may be used, and the material may be wound around the member. Due to the rotational moment described above, torque is applied to the material constituting the globe. This torque acts between this material and the cavity portions a1 and b1.

  By changing the position and weight of the weight 36c, the rotational moment (torque) applied to the shaft 36a can be adjusted. In other words, the rotational force applied to the evaluation object can be adjusted by changing the position and weight of the weight 36c.

  In the evaluation by the evaluation device 30, the torque mechanism applies a predetermined rotational moment to the shaft 36a, and the pressurizing mechanism 34 applies a predetermined vertical pressure to the evaluation object. Due to these, a rotational force is applied to the evaluation object.

  An example of evaluation is a rotation angle. With the rotational force and the vertical pressure applied to the evaluation object, the rotational angle of the shaft 36a is measured. This rotation angle indicates the slipperiness of the evaluation object.

  Another example of evaluation is a circumferential shear force. The circumferential shear force is measured in a state where the rotational force and the vertical pressure are applied to the evaluation object. This measurement can be achieved by the force sensor. From the viewpoint of enabling measurement of the circumferential shear force, it is preferable to use a force sensor in the evaluation step st2.

  For example, the force sensor is disposed so as to be exposed on the surface of the evaluation object. The force sensor is in contact with the arrangement portion 32. The greater the slip, the greater the value of the circumferential shear force detected by the force sensor. The smaller the slip, the smaller the value of the circumferential shear force detected by the force sensor.

  A plurality of force sensors may be arranged. The plurality of force sensors allow measurement regardless of the position of the golfer's hand. For example, the plurality of force sensors can be arranged at different positions. In this case, the grip performance at each position can be evaluated. For example, the force sensor may be disposed in each of the butt portion G11, the central portion G12, and the tip portion G13 (see FIG. 3).

  As described above, in the evaluation by the evaluation device 30, predetermined vertical pressure and rotational force (torque) are applied. The vertical pressure is determined based on the grip force measured in the measurement step st1. This rotational force is determined based on the rotational torque measured in the measurement step st1.

  Preferably, the swing operation in the measurement step st1 is a waggle. The waggle is an operation performed by the golfer before the shot. A typical waggle is an operation in which the weight of the right foot and the left foot are alternately shifted in the address state, the shoulder force is removed, the wrist is lightly folded left and right, and the head is moved small left and right. Waggle is effective in creating shot images while relaxing the body.

  As described above, the waggle is different from the actual shot swing. Waggle is also different from normal swing. The amount of movement of the head in the waggle is small. The gripping force acting on the grip in the waggle is much smaller than in the case of a shot. The rotational torque acting on the grip in the waggle is much smaller than in the case of a shot.

  The evaluation of golf grips and golf gloves is mainly hard to slip. Therefore, those skilled in the art have evaluated under the condition that a large force acts on the grip. That is, those skilled in the art have evaluated under the conditions of full shot or swinging. However, the present inventor has found that the conventional evaluation does not necessarily coincide with the sensory evaluation of the user. As a result of diligent examination of this discrepancy, the present inventor has found that evaluation under the conditions of waggle increases the consistency with sensory evaluation. From this viewpoint, preferably, the swing motion is a waggle. Preferably, in the measurement step st1, the grip force in the waggle is measured. Preferably, in the measurement step st1, the rotational torque in the waggle is measured.

  The swing operation in the measurement step st1 may be performed by a golfer (human) or a swing device. When the swing device is used, the reproducibility of the swing is increased and the grip force can be measured with high accuracy. The waggle may be implemented by a golfer (human) or a swing device. Preferably, the waggle is implemented by a golfer.

  The swing device 2 described above can reproduce waggle. As described above, the swing device 2 is capable of rotating around the rotation center line R1 set at a position intersecting with the grip portion G1. By setting the rotation center line R <b> 1 at this position, a waggle rotation motion can be imparted to the club 20. From the viewpoint of human proximity to waggle, the rotation center line R1 preferably intersects the butt portion G11 or the central portion G12 of the grip portion G1, and more preferably intersects the central portion G12 ( (See FIG. 3).

  From the viewpoint of human closeness with waggle, the rotational angle of the rotational motion is preferably 60 degrees or less, more preferably 50 degrees or less. Preferably, the rotational motion is a reciprocating motion. Preferably, the reciprocating motion includes a rotation Rt in the takeback direction and a rotation Rd in the downswing direction. Preferably, in the reciprocating motion, the rotation Rt and the rotation Rd are executed alternately.

  In the swing, the head trajectory is a substantially circumferential trajectory. The head trajectory includes a position where the head is the lowest point. An impact is made at or near this lowest point. The club movement by swing includes a club position where the head is at the lowest point. Preferably, the rotational movement includes a club position where the head is at the lowest point. Preferably, the rotational motion is a reciprocating motion including a club position where the head is at the lowest point.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Example 1] (Evaluation of grip)
A wood-type head and a rubber grip were attached to the carbon shaft. A groove was provided on the surface of the grip. This groove had a large number of vertical grooves and a large number of horizontal grooves. Further, a three-axis force sensor and an angular velocity sensor were prepared. A hole extending from the inner surface of the shaft to the grip surface was provided, and a triaxial force sensor was disposed in this hole. The triaxial force sensor was arranged such that its detection part was exposed on the grip surface. The triaxial force sensor was arranged to measure vertical pressure, circumferential shear force and axial shear force. A sensor casing as shown in FIG. 5 was attached to the grip end, and an angular velocity sensor was disposed inside the sensor casing. Thus, a golf club according to Example 1 was obtained.

  First, a measurement step was performed. A golfer as a tester wagged with the golf club. The angular velocity in the waggle was measured by the angular velocity sensor. The measurement result is shown in the graph of FIG. At the same time, the vertical pressure in the waggle was measured by the triaxial force sensor. The measurement result is shown in the graph of FIG.

  In the graph of FIG. 7, the horizontal axis represents time (seconds) and the vertical axis represents angular velocity (degree / second). In the graph of FIG. 8, the horizontal axis represents time (seconds), and the vertical axis represents vertical pressure (N).

  Using the peak value in the measurement result of the angular velocity sensor (FIG. 7), the rotational torque was obtained by multiplying the peak value by the moment of inertia of the head. Based on this rotational torque value, the rotational force in the evaluation step was determined. This rotational force was set to a predetermined value of 0.22 N · m or more and 0.25 N · m or less.

  Using the peak value in the measurement result of the vertical pressure (FIG. 8), the vertical pressure in the evaluation step was determined based on this peak value. This vertical pressure was set to a predetermined value of 1.5N or more and 2N or less.

  Next, an evaluation step was performed. The golf club used in the measurement step and the evaluation device 30 (FIG. 6) described above were used. The position and mass of the weight 36c are determined so that the rotational force becomes the above set value. The tightening degree of the fastening body 32c in the pressurizing mechanism 34 was adjusted so that the vertical pressure became the set value. This vertical pressure was confirmed by the force sensor built in the golf club. The rotational force was applied, and the circumferential shear force was measured by the force sensor. The peak value of the circumferential shear force was 0.5N.

[Example 2] (Evaluation of grip)
The evaluation method of Example 2 was carried out in the same manner as in Example 1 except that the groove on the grip surface was changed to a combination of many vertical grooves and wrinkles (wrinkle processing). The peak value of the circumferential shear force was 1N.

[Example 3] (Evaluation of grip)
The evaluation method of Example 3 was carried out in the same manner as in Example 1 except that the groove on the grip surface was changed to a honeycomb pattern. The peak value of the circumferential shear force was 1.5N.

  Separately, sensory evaluation was performed by humans. In this sensory evaluation, the difficulty of slipping of Examples 1 to 3 was evaluated. As a result, Example 1 (vertical grooves and horizontal grooves) was the least slippery, Example 3 (honeycomb pattern) was the most slippery, and the evaluation of Example 2 was between Examples 1 and 3. The result of this sensory evaluation was consistent with the measurement result of the circumferential shear force of Examples 1 to 3.

[Example 4] (Evaluation of globe)
The evaluation device 30 (FIG. 6) described above and the golf club of Example 1 described above were used. A sheet made of glove material was prepared. One layer of this sheet was wound around the grip of Example 1 above. Others were the same as in Example 1, and the peak value of the circumferential shear force was obtained.

[Example 5] (Evaluation of globe)
The peak value of the circumferential shear force of Example 5 was obtained in the same manner as Example 4 except that the type of the sheet was changed.

  Separately, sensory evaluation was performed by humans. In this sensory evaluation, the resistance to slip was compared between a glove made from the material of Example 4 and a glove made from the material of Example 5. The result of this sensory evaluation was consistent with the measurement result of the circumferential shear force described above.

  From these evaluation results, the superiority of the present invention is clear.

  The method described above can be applied to grip and glove evaluation.

DESCRIPTION OF SYMBOLS 2 ... Swing apparatus 4 ... Base 6 ... Main body 8 ... Tilt part 10 ... Rotation part 12 ... Club holding part 14 ... Control part 20 ... Golf club 22 ...・ Head 24 ・ ・ ・ Shaft 26 ・ ・ ・ Grip G1 ・ ・ ・ Grip part

Claims (4)

A measurement step for measuring a grip force in a swing operation and a rotational torque in the swing operation using a golf club provided with a multi-axis force sensor and an angular velocity sensor in the grip portion;
An evaluation step for evaluating the grip performance of the evaluation object using the evaluation device;
An evaluation method including
The evaluation object is a golf glove or a golf grip,
The evaluation device includes an arrangement unit that can arrange the evaluation object, a pressurizing mechanism that can apply a vertical pressure to the evaluation object, and a torque mechanism that can apply a rotational force to the evaluation object. And
Based on the grip force measured in the measurement step, the vertical pressure is determined,
Based on the rotational torque measured in the measurement step, the rotational force is determined,
In the evaluation step, the evaluation is performed by applying the determined vertical pressure and the rotational force to the evaluation object.   The evaluation method according to claim 1, wherein the swing motion is a waggle. The swing motion is a rotational motion,
The evaluation method according to claim 1 or 2, wherein a rotational center line of the rotational motion intersects the grip portion.   The evaluation method according to claim 3, wherein the rotational motion is a reciprocating motion with a rotational angle of 60 degrees or less.

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