JPS5940465B2 - golf practice equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a golf practice device that allows golf swing practice in a narrow space.

Conventional golf practice devices (J single) that can be used in small spaces to measure precise flight distance, direction, etc. using devices that only rotate the ball or limit the flight range of the ball have many drawbacks. Anything that could do this required a large space and expensive equipment.

The present invention is designed to measure and display enough data to correct your swing in the space of swinging a golf club, making it convenient for practicing golf in a small space.

That is, the present invention (J) includes a ball holder having elasticity, a golf ball placed on the ball holder, a plurality of filaments connected to each of the ball holder and the golf ball, and a plurality of filaments connected to each of the ball holder and the golf ball. A tensile force detection device comprising a resistor connected to the other end, a stretchable elastic body that makes the resistor elastic, and a contact continuity piece that detects the magnitude of movement of the resistor; The gist of the invention is a golf practice device characterized by comprising a calculation device that calculates data.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the golf practice device of the present invention, in which 1 is a golf ball, 2 is a ball holder, 3 is a stance display, and 4 is a perspective view of a golf practice device according to the present invention.
7 is a display 7. FIG. 3 shows a striking force detection mechanism in a golf practice device of the present invention, and a golf ball 1r is shown in FIG. A filament 9 is fixed to each of the contacting portions 5t6, 7, and 8i of 2f, and each of these filaments 9 is connected to a tensile force detection device 10.
A to 10dl are connected and adjusted to apply an appropriate pulling force so that the golf ball 1 does not fly up too much due to the shock of the hit.

Furthermore, the ball holder 2f (Fig. 3) is connected to the filament 11 and the tensile force detecting devices 12a to 12d so that the ball holder 2 bends to an appropriate size when the ball 1 is hit. It is adjusted by the attractive force of each tensile force detection device 12a to 12d.

FIG. 4 shows tensile force detection devices 10a to 1 in an embodiment of the present invention.
oa, 12a12d, each tensile force detecting device 10a to 10d is shown in FIG.

When a tensile force is applied to 12a to 12d, the spring 13 in the tensile force detection device is expanded.

This elongating force moves the position of the resistor 14, and the magnitude of the movement is detected by the contact conduction piece 15 and taken out as an electrical output (electrical resistance value) from the output connector 16.

The output signals (electrical resistance values) from each of the tensile force detection devices 10a to 10d and 12a to 12d are inputted to an arithmetic unit, such as a microcomputer (Fig. 5), and the signals (analog signals) are inputted to an A/D From the converter f, the time-divided digital signal l is converted and sent to the central operator (CPU).
is constantly monitored.

In FIG. 5, various registers, buffers, etc. are omitted, and a clock generator, system controller, etc. are included.

When the system diagram of FIG. 5 is illustrated in detail, it becomes as shown in FIG. 6.

In the same figure, CG? iCharacter Generator, AD
and AD, ~A D3L! Address decoder, 10
a, 10b, 10c, 10d, 12a.

12b, 12c, 12d are tensile force detection devices, ADC,
~ADC31 A/D converter, 38B1~
38B31-J3 state buffer, DB? j Deco bus, ABLE address bus, CB? j control bus and CPULf central operator, respectively.

Next, the principle of tensile force detection in the present invention will be explained.

In the tensile force detection devices 10a to 10d, 12a to 12d, since the end portion of the resistor 14 is supported by the spring 131, when the golf ball 1 is hit, the tension of the golf ball 1 and the ball holder 2 is Movement and springs 13
Due to the restoring force and f, the resistor 14 dampens and oscillates until the golf ball 1 comes to rest at a predetermined position, and as a result, the output connector 16 outputs an analog signal (output resistance value) shown in FIGS. is obtained.

That is, when the golf ball 1 is stationary (J tensile force detection devices 10a to 10d).

12a to 12d) The contact continuity piece 15 (C, the resistor 14 is located in the center of Figure 4), and at this time a signal of a constant value (initial resistance value: Ao is output from the output connector 16). However, due to the impact of the golf ball 1, the tensile force applied to the filament 9 changes, and when the position of the resistor 14 changes in the direction of pulling the spring 13, as shown in FIG. The resistance value obtained from the output connector 16 decreases from the initial resistance value 2Ao, and when the change in the applied tensile force and the tension of the spring 13 are balanced, the restoring force f of the spring 13 causes the resistor 14 to return to the initial position 1.
The resistance value obtained from the output connector 16 gradually increases to 1, which is the initial resistance value: Aof. However, due to the inertia of the golf ball 1, the spring 13, etc., the resistance value of the resistor 14 (J initial position I Spring 1 does not stop.
As the position changes in the direction of pushing 3, the output resistance value ('', initial resistance value: Ao) begins to increase, and when the inertial force balances the force of the spring 13, the resistance element 141'' spring 1
3I is thus pushed back toward the initial position, and the output resistance value gradually decreases by one initial resistance value: Aof.

By repeating this process, the output resistance value gradually changes;
This attenuates and converges to a constant resistance value (initial resistance value 'AO).

Further, when the position of the resistor 14 changes in the direction in which the spring 13 is initially pushed by the first blow, the change in the output resistance value output from the output connector 16 becomes the attenuation curve shown in FIG. 9B1.

As described above, changes in the tensile force applied to the golf ball 1f due to the impact applied to the filaments 9 and 111 are shown in FIGS. An output that follows the attenuation curve f is obtained, but the attenuation time (the time from when the resistance value changes to when the change converges to the initial resistance value of 1) depends on the impact force, the direction in which the impact force is applied, etc. Therefore, since it is not constant, the change in the resistance value is used as it is as a decouple for calculating flight distance, direction, rotational force, rotation direction, etc., which will be described later.
This [1 tool exists, so the microcomputer (
This input resistance value change is processed by software inside the computer.

That is, each tensile force detection device 10a to 10d, 12a to
The resistance value (analog signal) that is continuously input from the microcomputer 12d to the microcomputer 12d is time-divided by the converter f and converted into a digital signal f. When the input resistance value is compared with the initial resistance value: Ao, it is found that the input resistance value is a resistance value that is less than the initial resistance value: Ao (the tensile force in the direction in which the resistor of the tensile force detection device is pulled by the filament is (resistance value when the resistance value occurs), and initial resistance value: A-oj After the same resistance value continues for a certain period of time or more, the above condition 1 is met.
Only when a matching resistance value is input, the difference (resistance value change) between the input resistance value and the initial resistance value: Ao is integrated.

Furthermore, even though the golf ball 1 is in a stationary state, due to rocking, vibration, etc. of the ball holder 2, etc., changes in the resistance values output from the tensile force detection devices 10a to 10d, 12a to 12d are detected. In order to prevent malfunctions in integrating as data on blows, a process is performed in which only the difference between a certain resistance value (A1 or less) and the initial resistance value (Ao) is calculated when the above conditions I and I are met. In this case, the shaded area in FIG. 9 is integrated and completed.

On top of this, the tensile force detection device 10a to 1 from the blow 1
0d, resistance value change output from 12a to 12d (J,
Inside the computer, comparison is made according to preset conditions (according to this), only resistance value changes that meet one of the conditions are selected and integrated, and the impact data ('', experimental f Based on the obtained relationship f between the integrated resistance value and the tensile force, the resistance value f is converted into a corresponding tensile force.

In addition, when detecting the rotation of the golf ball 1, in addition to the method of converting the integrated resistance value into a tensile force as described above (this method is used to Measure the resistance value (Fig. 9) after time: 1., 12 elapses, use the resistance value difference between this resistance value and the initial resistance value: Ao, and calculate the magnitude of the resistance value difference according to the magnitude of the tensile force f. A method of conversion is used.

Next, the principle of calculating the ground direction, flight distance, etc. of the golf ball 1 from the initial velocity, launch angle, rotational force, rotational direction, etc. of the golf ball 1 will be explained.

Here, each tensile force detection device 10a, 10b, 10c.

10d, 12a, 12b, 12c, 12d (note that the tensile forces applied by one arrow in FIG. 3 (indicating the flight direction of one ball) are f 10a and f 10b, respectively.

flOc, flOd, f12a, f12b, f12c.

The initial velocity of the stumbling ball 1 is set to f12d.

(′J, impact force applied to the ball (f 10 a+
f 10 b + f10c + f10d + f12a + f12
Assuming a force equivalent to b + f12c + f12dl) is all converted into the kinetic energy of ball 1, then F = LMV, )''t, that is, V.

= V■7 guns (F - hitting power, M - weight of ball)! It is given from this.

Therefore, by entering this formula into the computer f, the initial velocity of ball 1 can be calculated.

The launch angle θ of ball 1 is fA=f12c+f 12
d-f 12a-f 12b, fB=10c+f
10 d--f10a-f10b as U=fA-fB
From the value U, the launch angle θ1 of the ball 1 shown in Fig. 8f is
Determine θ4 in advance, store it in the memory of the microcomputer, and compare this value with the actual value U when hitting the ball of the present invention (the golf practice device). Determine θ.

At this time, if the launch angle is subdivided (the launch angle can be corrected by proportional division).

At this time, it is assumed that the range of θ1 to θ4 can be subdivided into θ1 to θ4 depending on accuracy.

Flight distance of ball 1 1 It can be calculated from the general physical formula R = LVo"sin 2θ (g: gravitational acceleration) in a vacuum, so if you put this formula into your computer, you can determine it as described above. initial velocity V.

The flight distance is calculated from the launch angle θ.

When the ball 1 flies left and right, that is, when it slices 1 or hooks, the rotational force and rotational direction of the ball 1 must be taken into consideration.

When the ball 1 slices (range B shown in FIG. 7 (when the ball flies), clockwise rotational force and rotational direction are applied to the ball 1. and at t2 f 10d>flO
c.

There is a relationship f12d>f12c, and the change in tensile force is expressed as time (
Detected as pulse data for this, f Ml.

-f 10d - f 10c (at t1 (value at this time), 1
M2-f 10 d f 10 c (value at 1 at t2), 1M3-f12d-f12c (value at 1 at t), fM4-f12d-f12c (value at 1 at t2). B, the rotational force of ball 1 is fM=fM,
It can be expressed as +fM2 + fM3 + fM4.

Therefore, when the ball 1 slices (that is, rotates to the right), the value of the rotational force fM (the direction in which the ball 1 flies is determined in advance as shown in FIG. The flight direction of the ball 1 is determined by comparing this value with the actual rotational force fM when hitting the ball 1 of the golf practice device according to the present invention.

Furthermore, it is also possible to analyze in which distance range B1 to B1□ the ball 1 flies in the direction B shown in FIG. 7 from the flight distance R mentioned above.

Similarly, the case where the ball 1 hooks (the case where the ball flies in range C shown in FIG. 7) is also determined.

At this time, the range B1 to B17 + C1 to C1□ can be further subdivided within the range of measurement accuracy, and the width in the direction A (FIG. 7) in which the ball 1 moves straight is also increased or decreased according to the measurement accuracy f.

The relationship between the result of the calculation, which is based on the above-mentioned mechanical principles, and the ball's falling position is stored in the computer's memory in advance by adding the deviation from the calculation formula that occurs during actual batting as a correction term. The calculation results stored in the computer 1 and the respective tensile force detection devices 10a to 10d are stored.

Compare the results calculated from the tensile force values (hitting data) detected from 12a to 12d, and determine the flight distance, direction, rotational force, rotational direction, initial velocity, etc. of the golf ball 1 corresponding to the applied impact f. 1 is displayed on a display 4 such as a digital display or a visual display, or on an X-Y plotter as necessary.

Also, if there is any undesirable ball rotation in the golf swing, such as a slice or a hook, the situation will be displayed.

Tensile force detection devices 10a to 10d according to embodiments of the present invention.

12a to 12dt, spring 13 and resistor 14
These are the combinations (spring 13)
(4) Elastic bodies other than spring steel or bellows can be substituted, and the resistor 14 can be replaced by a potentiometer or (
It can also be done using a combination of LED and photo sensor using the method described by J Photoden 1.

Ball holder 2 (here too, an elastic body made of a material other than spring steel can be used instead).

Further, the shape may be from a spiral shape to a rod shape or a cylindrical shape.

Due to the hardness f of these materials, a protective cover 17 is removed as shown in FIG. 3 to protect the club head.

As explained above, according to the present invention, when a golf ball is hit, the magnitude of the deflection of the ball holder, the force with which the golf ball flies up, and the rotational force of the golf ball are detected. Original (this fixed procedure t
This calculation device (A microcomputer) can calculate and display the flight distance, direction, rotational force, rotational direction, initial velocity, etc. of a golf ball, allowing accurate golf practice and practical use. This is an extremely useful invention.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 (4) is an overall perspective view, and FIG.
3 (1) A perspective view showing the basic structure of the internal mechanism of the golf practice device of the present invention; FIG. 4 (A vertical sectional view of the tensile force detecting device; Figure 5 (Electrical system diagram of the computing device, Figure 6 (Electrical system diagram showing Figure 5 in detail, Figure 7 (Explanatory diagram showing the flight direction of 4 balls, Figure 8 (1 ball Explanatory diagram showing the launch angle of
The figure is a graph showing changes in the output resistance value from the tensile force detection device. 1... Golf ball, 2... Ball holder, 3... Stance display, 4...
Display, 5° 5.7, 8... Golf ball filament fixing position, 9° 11... String, 10a
, iob, 10c, 10d. 12a, 12b, 12c, 12cl-, - tensile force detection device, 13... spring, 14...
...Resistor, 15...Contact continuity piece, 16.
...Tensile force detection device output connector.

Claims (1)

[Claims] 1. A ball holder having elasticity, a golf ball placed on the ball holder, a plurality of filaments connected to each of the ball holder and the golf ball, and a plurality of filaments connected to the other end of each filament. a tensile force detection device comprising a resistor, a stretchable elastic body that elastically supports the resistor, and a contact continuity piece that detects the magnitude of movement of the resistor; and a calculation for calculating data from the detection device. A golf practice device comprising a device.