JPH0586203U - Tug of war shoes - Google Patents

Abstract

(57) [Summary] [Purpose] In a tug of war competition, increase the backward tilt of the athlete's body and increase traction. [Composition] A shoe in which the toe part on the bottom surface of the shoe is thicker than the heel part so that the toe part of the shoe is higher than the heel part by an appropriate amount.

Description

[Detailed description of the device]

[0001]

[Industrial field of application] The present invention relates to shoes mainly used in a tug of war competition or a sports competition in which the power is concentrated in one direction like a tug of war.

[0002]

2. Description of the Related Art Conventionally, various types of tug of war shoes have been provided, but their shapes are not much different from those of ordinary sports shoes, and their main purpose is to prevent slipping on the floor of a gym. However, it did not consider the limit of the bending angle of the human ankle joint.

[0003]

[Problems to be solved by the device] In a tug of war competition, victory and defeat are not determined solely by muscle strength, but form is a major factor. That is, the body is not bent at the waist and the waist, back, and knees are straightened, and the body is leaned backward so that the weight is applied to the pulling force. Therefore, what is important is that the lower the tilt angle of the body, the better. It is an object of the present invention to provide tug of war shoes for reducing the fall angle.

[0004]

[Means for Solving the Problems] Conventionally, it has been considered important to increase the frictional force between the floor surface and the shoe in order to reduce the angle at which the body is tilted backward. Although the unevenness pattern has been improved, of course, it is also important, but another important thing is that there is a limit to the angle at which the human ankle can bend backwards, and the sole of the foot must be worn on the floor. Until then, there is a limit to how much you can lean backward while keeping your body straight. In other words, when the backward bending angle of the ankle joint reaches its limit, the knee joint begins to bend, increasing the moment applied to the knee joint and using a lot of muscle strength to endure it, and If you exceed the upper and lower limits of your muscle strength, your form will collapse further and you will win or lose.

Therefore, the point of this invention is to form the shoe sole so as to compensate for the angle of the ankle joint bending backward so that the body can be tilted backward without bending the knee. . Therefore, the present invention provides a shoe in which the toes are higher than the heel portion of the shoe and the frictional force with the floor does not change.

Now, regarding the determination of the size of the inclination angle 3 of the shoe sole, if the angle is extremely increased, the toes are raised, and the rearward inclination angle of the body is too low, the floor surface and the sole surface of the shoe are reduced. The normal force of is reduced and the frictional force is reduced. Therefore, in determining the angle, it is important to grasp the limit of frictional force between the floor surface and the sports shoes for gymnasium.

Hereinafter, a method of determining the size of the inclination angle 3 of the shoe sole will be described using a specific example. A flat plate with a surface equivalent to the floor of the gymnasium, cleaned of dust and oil, was placed, basket shoes were placed on the slope, and the tangent at the beginning of sliding was calculated, and a value of 2.0 was obtained. . This is the coefficient of friction, and the angle corresponding to its tangent is about 64 degrees. Therefore, the angle obtained by subtracting it from 90 degrees, that is, 26 degrees, is the limit rearward inclination angle measured from the floor surface, and the size of this angle is the angle at which the maximum frictional force is obtained when the shoe is used. .

On the other hand, if the limit of the physical backward tilt angle of the athlete's ankle is 40 degrees from the floor surface, the difference between this numerical value and the above-mentioned limit rear tilt angle of 26 degrees. That is, 14 degrees is the sole angle of inclination 3 required to obtain the ideal backward inclination angle of the body. In other words, at this time, the frictional force of the sole is maximized, and it becomes possible to apply more weight to the rope without imposing an unnecessary burden on the muscles above and below the knee. Of course, if you have a sole with a larger coefficient of friction, you can further reduce the rearward tilt angle.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the tug of war shoe of the present invention has a shape in which a shoe body 1 is joined to a shoe body 1. The shoe sole 2 is made of synthetic rubber, synthetic resin, etc., the upper surface of the shoe sole 2 has the same shape as the bottom surface of the shoe body 1, and the shoe body 1 and the shoe sole 2 are bonded by an adhesive or integrally molded. It is made of, and is strongly bonded so that it can withstand the sideslip force sufficiently.

Further, like the horseshoe, the shoe sole 2 is wider toward the bottom so that the contact surface with the floor is wide and stable so that the foot is not crushed during the competition. Further, the inclination angle 3 of the shoe sole varies depending on the individual difference in the backward inclination angle of the ankle, but in general, an angle of about 13 degrees is suitable. In addition, the corner 4 of the toe of the shoe sole is a size that is opened forward by an angle necessary for the base of the athlete's big toe to transmit the force pushing the shoe sole to the floor surface. 120 degrees is suitable. As for the sole pattern, any shoe with a normal coefficient of friction may be used, similar to the shoes for a normal gym.

[0011]

[Effect of the device]

 The use of these shoes allows you to lean backward enough while keeping your knees straight, which reduces the strain on the muscles that can withstand knee bending and maximizes muscle efficiency. Since it can be used for, you can put more weight on the rope and improve the winning rate in the tug of war.

[Brief description of drawings]

FIG. 1 is a side view of a tug of war shoe of the present invention.

FIG. 2 is a plan view of a tug of war shoe.

[Explanation of symbols]

 1 Shoe body 2 Sole 3 Sole inclination angle 4 Sole toe angle

Claims (1)

[Scope of utility model registration request] 1. A shoe configured such that the toe portion of the sole is thick, the thickness thereof is gradually reduced toward the heel portion, and the sole is gradually widened toward the bottom surface.