JPH07246264A - Structure for golf swing practice device - Google Patents

Abstract

PURPOSE:To provide a golf swing practice device for learning square swing with a simple device to be fitted to a shaft. CONSTITUTION:A mechanism composed of a face 3 equivalent with a club face and a weight 7 to be hung by gravity is fitted to the shaft near a grip. The index of swing with the square relation of the face and the weight is applied and trouble such as destruction caused by the shock of hitting is canceled. Then, the device is miniaturized and made light in weight and can be freely detached from the shaft, and the square swing can be rationally and efficiently learnt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf swing training device which is attached to a shaft of a golf club and rationally learns a swing.

[0002]

2. Description of the Related Art A golf swing is preferably a square swing in which the club face is always kept vertical and rotates. Japanese Patent Application No. 5-273239 provides a golf swing practice device that facilitates learning of this square swing. The abstract of the patent is as follows. This is a device having a structure in which a mechanism (hereinafter, referred to as a vertical display mechanism) including a surface and a weight suspended by gravity in the vicinity of the surface is attached to a shaft of a golf club. Fig. 3 is Japanese Patent Application No. 5-273239.
2A is a front view a and a side view b of the embodiment described in FIG.
A vertical display mechanism is configured by the circular ring 2, a weight support rod 5 forming a fulcrum O of the weight at the center of the circular ring, and a weight 7 suspended by gravity around the O point as a fulcrum, and mounted on a mount 10. The semi-cylindrical cavity 9 is detachably fitted into the shaft. The ring 2 forms the face 3.

The device is mounted near the grip of the shaft. Address and set the edge of the club head, and face 3 perpendicular to the flight line. The surface 3 is a surface equivalent to the club face (hereinafter referred to as an equivalent surface). The weight 7 is suspended in the equivalent plane by gravity. In the swing in which the weight 7 continues to be suspended in the equivalent plane, the club face is always held vertically and rotates, and impacts perpendicularly to the flight line. That is, a golf swing training device is provided in which the positional relationship between the weight 7 and the circular ring 2 gives a square swing index.

[0004]

However, the golf swing training apparatus of the above-described embodiment is poor in practicality because of the following inconvenience caused by the impact of a hit ball. 1) The vertical display mechanism is locally destroyed. For example, the connection between the ring 2 and the mount 10, the connection between the ring 2 and the weight support rod 5, or the connection between the weight support rod 5 and the weight 7 is destroyed. 2) The torque generated by the impact causes the device to slip around the shaft. The present invention relates to a structure for solving the above-mentioned inconvenience of the golf swing practice device of Japanese Patent Application No. 5-273239.

[0005]

[Means for Solving the Problems] When the vertical display mechanism has a rigid structure, impacts are concentrated locally and are easily broken. Rather, the structure in which each part bends due to impact disperses the impact and is resistant to damage. The main impact of the hit ball is a torque-type impact around the shaft. The structure is designed so that the impact will bend around the shaft only at the moment of hitting. This includes the form of the device, the physical properties of the components,
And dimensions are relevant.

1) Means relating to the form of the device. A surface 3 is formed by an annulus 2 displayed on a cylinder 1 which is bent around the shaft by the impact of a hit ball. Further, the circular hole 4 is provided with a circular hole 4 and the weight support rod 5 is bent around the shaft by the impact of a hit ball.
It is fixed to the cylinder 1 so as to be located at the center of the. Further, a weight 7 is connected to the circular hole 4 via a ring 6 to form a vertical display mechanism. On the mount 10 with the notch 8 and the semi-cylindrical cavity 9, the surface 3 is parallel to the central axis k of the semi-cylindrical cavity 9 or the central axis k
A vertical display mechanism is attached so as to be movable about an axis n perpendicular to the golf swing training device. The semi-cylindrical cavity 9 is detachably fitted into the shaft near the grip through the notch 8. If necessary, a friction material is interposed on the boundary surface between the shaft and the semi-cylindrical cavity 9.

2) Means relating to physical properties and dimensions of constituent members. In order for the vertical display mechanism to always maintain the required shape and bend around the shaft due to the impact of a hit ball, there are suitable conditions for the physical properties and dimensions of the constituent members. Although it is difficult to theoretically analyze the impact problem of a hit ball, considering the impact test of a hit ball, the appropriate conditions are as follows. The component has a Young's modulus of 10 to 40
A polymer elastic body of × 10 ³ kg / cm ² is suitable. The weight of the weight 7 is suitably 1 g or less. The weight support rod 5 that suspends a weight 7 having a weight of 1 g or less at all times and bends around the shaft by the impact of a hit ball has a length L ≦ 60 mm and a width W = 3 to 10 m.
m and thickness T = 0.1 to 1.5 mm are suitable.

Further, there are the following two types of cylinders 1 that always support the weight and the weight support rod to maintain the shape of the ring 2 and bend around the shaft by the impact of a hit ball. Cylindrical a: Inner diameter R ≦ 50 mm, wall thickness D = 0.1 to 1.5
mm, height H = 2 to 20 mm. Cylindrical B: Inner diameter R ≦ 50 mm, wall thickness D = 2 to 10 mm,
Height H = 0.1 to 1.5 mm. The cylinder a bends so that the cylinder collapses. Cylinder B is thin height H
Bend in the direction of.

[0009]

Function: The device keeps its form as a practice device at all times when the impact of a hit ball does not act. A semi-cylindrical cavity 9 is fitted into the shaft near the grip through the notch 8. It can be attached and removed freely. The surface 3 is movable about the central axis k, or the central axis k and the axis n. At the grip side, the acceleration due to the swing is sufficiently smaller than the gravitational acceleration, and the weight 7 is suspended vertically. Addressing and setting the edge of the club head and face 3 perpendicular to the flight line, face 3 becomes the equivalent face of the club face. The weight 7 is vertically gravitated with the circular hole 4 as a fulcrum,
And it hangs in the equivalent plane. In the swing in which the weight 7 continues to be suspended in the equivalent plane, the club face is always held vertically and rotates, and impacts perpendicularly to the flight line. In other words, the positional relationship between the weight 7 and the circular ring 2 functions as a golf swing training device that gives a square swing index.

At the moment of hitting the ball, the cylinder 1, and accordingly the displayed ring 2, and the weight support rod 5 have a structure in which they are bent around the shaft by the impact of the ball, and the weight 7 passes through the ring 6 through the circular hole 4 Since it is a structure that rotates on a fulcrum, each part of the device returns to its original shape while vibrating and does not break. Further, the torque at the boundary surface between the shaft and the semi-cylindrical cavity 9 is also reduced, and slippage is suppressed. If necessary, slippage can be further improved by interposing a friction material on the boundary surface. That is, it functions as a highly practical golf swing training device capable of performing a series of training actions such as swing correction, hitting, and ball line observation.

[0011]

Embodiment 1 FIG. 1 is an embodiment 1 using a cylinder a and FIG. 2 is an embodiment 2 using a cylinder b. A surface 3 is formed by an annulus 2 displayed on a cylinder 1 which is bent around the shaft by the impact of a hit ball. Further, a weight support rod 5 provided with a circular hole 4 and bent around the shaft by the impact of a hit ball is fixed to the cylinder 1 so that the circular hole 4 is located at the center of the circular ring 2. Further, a weight 7 is connected to the circular hole 4 via a ring 6 to form a vertical display mechanism. The support plate 12 is fixed to the outer surface of the pipe 11 provided with the notch 8 and the mounting base 10 is attached.
Make up. A semi-cylindrical cavity 9 is detachably fitted into the shaft by using a suitable polymer elastic material for the pipe 11. If necessary, a friction material sheet is attached to the inner surface of the pipe 11.

As shown in FIG. 1, the vertical display mechanism is fixed to the support plate 12 by screws 13, for example, and the surface 3 is movably attached about an axis n perpendicular to the central axis k to construct a golf swing training apparatus. To do. There is a feature that the surface 3 can be set perpendicularly to the flight line regardless of the type of club or how to hold it. As shown in FIG. 2, the driver can set the surface 3 perpendicularly to the flight line simply by mounting the surface 3 parallel to the central axis k of the pipe 11.

The device always maintains the configuration shown in FIG. 1 or FIG. 2 and functions as follows. A semi-cylindrical cavity 9 is fitted into the shaft near the grip through the notch 8. It can be attached and removed freely. Surface 3 is center axis k, or center axis k and axis n
It is movable around the axis. On the grip side, the acceleration due to the swing is sufficiently smaller than the gravitational acceleration, and the weight 7 is suspended vertically. Address, the edge of the club head,
If the surface 3 is set to be perpendicular to the flight line, the surface 3 becomes an equivalent surface of the club face. The weight 7 is vertically suspended by gravity with the circular hole 4 as a fulcrum, and is suspended in the equivalent plane. In the swing in which the weight 7 continues to be suspended in the equivalent plane, the club face is always held vertically and rotates, and impacts perpendicularly to the flight line. In other words, the positional relationship between the weight 7 and the circular ring 2 functions as a golf swing training device that gives a square swing index.

At the moment of hitting the ball, the cylinder 1, and accordingly the indicated ring 2, and the weight support rod 5 have a structure which bends around the shaft due to the impact of the ball, and the weight 7 passes through the ring 6 through the circular hole 4 Since it is a structure that rotates on a fulcrum, each part of the device returns to its original shape while vibrating and does not break. Further, the torque at the boundary surface between the shaft and the semi-cylindrical cavity 9 is also reduced, and slippage is suppressed. If necessary, slippage can be further improved by interposing a friction material on the boundary surface. That is, it functions as a highly practical golf swing training device capable of performing a series of training actions such as swing correction, hitting, and ball line observation.

An example of the physical properties of the cylindrical member and suitability conditions for dimensions will be described. Suitable components are polypropylene, polycarbonate, etc., which are resistant to repeated stress. Polymer elastic polypropylene having a Young's modulus of 15 × 10 ³ kg / cm ² is used. Polypropylene thickness 0.7
A band with a width of 5 mm and a width of 10 mm is rounded, for example, an inner diameter R = 25
A cylinder 1 having a thickness of mm, a thickness of D = 0.75 mm, and a height of H = 10 mm is formed. When a predetermined line width is printed on the band in advance, an annular ring 2 having an inner diameter R = 25 mm of the line width is obtained. This cylinder always supports the following weight support rods and weights to keep a predetermined shape stable, and bends so as to be crushed around the shaft when the ball is hit. Transparent polypropylene is preferable so that the ring 2 can be seen through. Further, the circumference itself formed by the end of the cylinder 1 can be used as the ring 2.

Further, the length L of polypropylene is 27 mm,
A weight support rod 5 having a width W = 5 mm and a thickness T = 0.75 mm is fixed to the cylinder 1 so that the circular hole 4 is located at the center of the circular ring 2. This weight support rod suspends a weight weighing less than 1g by gravity,
Bends around the shaft due to the impact of a hit ball. Further, the ring 6 and the weight 7 are integrally molded with an acrylic rod having a diameter of 1 mm. The weight weighs about 0.1 g. A weight 7 is connected to the circular hole 4 via a wheel 6 to form a vertical display mechanism.

An example of the suitability condition of the size of the cylinder b will be described. When the component is polypropylene, the cylinder 1 has an inner diameter R
= 25 mm, wall thickness D = 5 mm, height H = 0.75 mm,
It is practical for the weight support rod 5 to have a length L = 27 mm, a width W = 5 mm, and a thickness T = 0.75 mm. The inner diameter of the cylinder 1 represents the annulus 2 and forms the surface 3. This cylinder has a height H
Bend in the direction of. The height H and the thickness T are the same, and the cylinder 1 and the weight support rod 5 can be integrated.

The weight of the above embodiment is as light as about 3 g.
Further, if the friction material is interposed on the inner surface of the pipe 11, the slip around the shaft can be prevented even against an abnormal impact of a miss shot.

[0019]

【The invention's effect】

1) Japanese Patent Application No. 5-2732 which makes it easy to learn a square swing with a structure that eliminates the inconvenience caused by the impact of a hit ball.
The practicality of the 39 golf swing practice devices has been significantly improved. 2) The device is compact and lightweight, and can be easily attached to and detached from the shaft, providing not only the practice field but also the convenience of checking the swing during the practice round.

[Brief description of drawings]

FIG. 1 is a front view a and a side sectional view b of a first embodiment of the present invention.

FIG. 2 is a front view a and a side sectional view b of a second embodiment of the present invention.

FIG. 3 is a front view a and a side view b of an embodiment of Japanese Patent Application No. 5-273239.

[Explanation of symbols]

 1 cylinder 2 circular ring 3 surface 4 circular hole 5 weight support rod 6 ring 7 weight 8 notch 9 semi-cylindrical cavity 10 mounting base

Claims (2)

[Claims] 1. A surface (3) is formed by an annulus (2) displayed on a cylinder (1) which is bent around a shaft by the impact of a hit ball, and a circular hole (2) located at the center of the annulus (2). The weight support rod (5), which is provided with 4) and is bent around the shaft by the impact of a hit ball, is fixed to the cylinder (1), and the weight (7) is further attached to the circular hole (4) through the ring (6). The suspended mechanism is provided with a notch (8) and is attached to a mount (10) provided with a semi-cylindrical cavity (9) which is detachably fitted to the shaft directly or through a friction material, and a surface ( 3) A structure of a golf swing training device in which the semi-cylindrical cavity (9) is movably mounted parallel to the central axis k or about an axis n perpendicular to the central axis k. 2. Young's modulus of 10 to 40 × 10 ³ kg / c
A cylinder (1) made of a polymer elastic body of m ^{2 and having} an inner diameter R ≦ 50 mm, a wall thickness D = 0.1 to 1.5 mm, and a height H = 2 to 20 mm, or an inner diameter R ≦ 50 mm, a wall thickness D = 2 to 1
A surface (3) is formed by an annulus (2) displayed on a cylinder (1) of 0 mm and height H = 0.1 to 1.5 mm, and a circular hole (4) located at the center of the annulus (2) is formed. ), Length L ≦
A weight support rod (5) having a width of 60 mm, a width W of 3 to 10 mm, and a thickness T of 0.1 to 1.5 mm is fixed to the cylinder (1), and further weighted to the circular hole (4) via the ring (6). Is a 1g or less weight (7) suspension mechanism, notch (8) is provided directly,
Alternatively, a surface (3) is provided on a mount (10) having a semi-cylindrical cavity (9) which is detachably fitted to a shaft via a friction material.
Is a structure of a golf swing training device that is movably mounted parallel to the central axis k of the semi-cylindrical cavity (9) or about an axis n perpendicular to the axis.