JP7145996B2 - stretching bar - Google Patents

Description

TECHNICAL FIELD The present invention relates to a stretching rod, and more particularly to a stretching rod having a cylindrical body made of resin.

Due to the increasing health consciousness, exercise such as walking is performed on a daily basis. Keeping your back straight, your chest puffed out, and walking with good posture not only enhances the effectiveness of your exercise, but also has many other benefits, such as increased lung capacity and flexible muscles around your shoulder blades.

Japanese Patent Laid-Open No. 2002-200001 proposes to stretch the back muscles by putting a stick around the back and holding the stick between the arms and the back. Patent Literature 1 discloses a bar made of a paper tube. This is to avoid injury to the human body due to breakage such as cracking or breakage of the main body of conventional wooden or plastic tools in the unlikely event that they fall over.

The paper tube of Patent Document 1 and conventional sticks made of wood, plastic, etc., which may be damaged, have no flexibility in the main body itself, and when used by turning it on the back, the stick becomes the fulcrum of the spine against the movement of both arms. In addition to moving back and forth, the load is always applied to the same position on the back, and there is a risk of injuring the back.

In addition, people with tight muscles around the shoulder blades are not able to fully rotate their arms behind their backs and press the bar more strongly against their backs, increasing the risk of back injury.

On the other hand, when flexibility is given to the bar, the ability to assist the movement of the other arm is reduced in conjunction with the movement of one arm, and eventually it becomes impossible to move both arms backward to an appropriate position. becomes difficult.

Furthermore, not only the paper tube of Patent Document 1, but also any assistive device that supports exercise, if it can be used only for a single exercise, the frequency of use is limited. It is desirable that the auxiliary tool is also compatible with

JP 2012-125531 A

The problem to be solved by the present invention is to solve the above-mentioned problems, to be able to be used to assist walking with the back straight, to cause less damage to the human body even when used for a long time, and to perform various exercises. To provide a stretching bar that can also be used for

In order to solve the above problems, the stretching rod of the present invention has the following technical features.
(1) A stretch bar having a solid cylindrical resin body, in which the rubber hardness of the resin used in the body is 90 degrees with a durometer tester type A conforming to the "JIS K 6253" standard. The range is 98 degrees or less, the length of the main body is in the range of 50 cm or more and 70 cm or less, and the diameter of the cross section of the main body is set in the range of 10 mm or more and 25 mm or less. and

(2) In the stretching rod described in (1) above, the resin is urethane rubber.

(3) The stretching rod described in (1) or (2) above is characterized in that grips made of a softer material than the main body are provided at both ends of the main body.

(4) In the stretching rod according to any one of (1) to (3) above, the main body is provided at its center with an abutting portion made of a material having higher cushioning properties than the main body. characterized by

(5) In the stretching rod described in (3) or (4) above, the grip portion or the contact portion is formed by laminating different materials.

The present invention provides a stretching bar having a solid cylindrical resin main body, in which the rubber hardness of the resin used in the main body is 90 degrees or more in durometer type A conforming to the "JIS K 6253" standard. , 98 degrees or less, the length of the body is in the range of 50 cm or more and 70 cm or less, and the diameter of the cross section of the body is set in the range of 10 mm or more and 25 mm or less. Even when the stick is strongly pressed against the back, the main body of the stick bends appropriately and curves along the chest circumference of the back, so that the load is not concentrated on one point of the spine. Moreover, even when the arms are swung back and forth, the movement of one arm can be transmitted to the other arm, allowing the arms to move smoothly.

Furthermore, since the stretching rod of the present invention has an appropriate degree of bending, it is possible to hold both ends of the rod to move the arm up and down or rotate it, to bend the entire rod by holding both ends of the rod, and to It can be applied to various exercises such as holding the center of the body with one hand and rotating it.

Fig. 2 is a side view of the body of the stretch bar of the present invention; It is a figure explaining the test method at the time of examining materials other than urethane rubber. 1 is an overall view showing an example of a stretching bar of the present invention; FIG. FIG. 10 is a diagram showing how the main body of the stretching rod of the present invention is wrapped around the back; It is sectional drawing which showed the appearance of the chest of FIG. 3, (a) shows a conventional example, (b) shows this invention. Fig. 2 shows a grip portion used in the stretching rod of the present invention, where (a) is a tapered shape in which the outer diameter increases toward the ends, and (b) is a grip portion with a thicker outer diameter at both ends. exemplifies the shape. FIG. 4 is a diagram showing an application example of the gripping portion and the contacting portion used in the stretching rod of the present invention.

Hereinafter, the stretching rod of the present invention will be described in detail using preferred examples.
As shown in FIG. 1 or 3, the stretching rod of the present invention is a stretching rod having a columnar body 1 made of resin. The range is 90 degrees or more and 98 degrees or less in a standard-compliant durometer tester type A, the length of the main body is in the range of 50 cm or more and 70 cm or less, and the diameter of the cross section of the main body is 10 mm or more. , 25 mm or less.

The stretching rod of the present invention can be used for a variety of exercises, but in particular, it is mainly used to hold the rod between the back and both arms during walking as an exercise for the back muscles, as shown in FIG. The degree of bending was evaluated, and the material and shape were selected. Symbol H is a human body, and FIG. 4 shows the back side. Also, FIG. 5 is a simplified view of the chest sliced at the position where the bar of FIG. 4 is held. In particular, when the degree of bending of the stick body 1 is too hard, as shown in FIG. can also cause injury.

FIG. 5(b) shows that when the degree of bending of the rod body 1 is appropriate, the rod body 1 bends along the curvature of the back, especially when both arms are not sufficiently pulled backward (the body is stretched). Even if it is hard), the load is not concentrated only on the position of the spine. be done. In the case of a flexible body where both arms can be pulled back sufficiently, the position of the rod body 1 is similar to that shown in FIG. 5(a). The pressing force f is weak, and there is little fear of damaging the spine or muscles near the spine.

There are a variety of resin materials, but when selecting a material, it is necessary to consider many parameters such as elasticity and resilience suitable for exercise, and resilience. , the optimal number differs depending on whether the person is an adult or a child, whether it is a man or a woman. Furthermore, when selecting materials, it is necessary to consider chemical stability and safety to the human body, considering that the material itself may come into direct contact with the hand.

When selecting the characteristics of the material used for the stretch bar of the present invention, elasticity, resilience, resilience, etc. are comprehensively considered, and the feeling when actually used for exercise is defined as "flexibility". evaluated. In addition, urethane rubber (polyurethane) was used as a standard material for evaluation, and the hardness of the rubber and the shape of the bar itself were adjusted to evaluate the optimum degree of bending.

As the material of the resin used for the stretching rod of the present invention, considering chemical stability and safety to the human body, for example, urethane rubber, silicon rubber, natural rubber, fluorine rubber, and these materials are suitable. It is possible to use a material added with an additive that imparts a high degree of rubber hardness. In addition, urethane rubber is most suitable for achieving a rubber hardness of 90 degrees or more.

When using a resin material other than urethane rubber, first, a cylindrical rod body is formed using urethane rubber under the conditions within the numerical range described above, and this is used as a standard specimen. A sample having the same shape as the standard test piece is formed from the selected resin material, and the resin material can be selected depending on whether or not the mechanical properties of the sample have numerical values equivalent to those of the standard test piece.

As a specific example of measuring the mechanical properties, as shown in FIG. A load F of a predetermined weight (for example, 0.1 to 1.0 kg weight) is applied to and the amount of displacement δ at that time is measured. If the amount of displacement δ of a sample made of a resin material that is a candidate for selection is within the range of ±10 to 20% of the amount of displacement δ compared with the amount of displacement δ of a standard specimen, the resin material can be used as a substitute for urethane rubber. It can be used as a commodity. A dashed line 1' in FIG. 2 illustrates the lower curve of the rod body to which the load F is applied.

Next, the rubber hardness and shape (length, thickness (diameter)), which indicate the appropriate "deflection condition" as the main body of the stretching rod of the present invention, were investigated.
Three types of urethane rubber to be tested were prepared with a durometer tester type A conforming to the "JIS K 6253" standard, with rubber hardnesses of 90 degrees, 95 degrees, and 98 degrees.
As shown in FIG. 1, lengths L of 50, 60, and 70 cm and diameters φ of 10, 15, 20, and 25 mm were prepared as the size of the cylindrical rod of the main body constituting the stretching rod.
The evaluation results for each bar are shown in Tables 1-3. In the evaluation results, "○" means "appropriate degree of bending", "△" means "somewhat soft or hard bending", and "×" means "inappropriate degree of bending". is doing.

From Tables 1 to 3, the rubber hardness of the urethane rubber is in the range of 90 degrees or more and 98 degrees or less, the length of the rod body is in the range of 50 cm or more and 70 cm or less, and the diameter of the cross section of the rod body is 10 mm. As described above, it can be understood that there is an appropriate numerical range for the stretching rod within the range of 25 mm or less. In particular, when the rubber hardness is lower than 90 degrees, when the length L of the main body exceeds 70 cm, or when the diameter φ of the main body is thinner than 10 mm, the degree of bending becomes too soft as a whole, making it difficult to use as a stretch bar. is not appropriate. On the other hand, if the rubber hardness is higher than 98 degrees, if the length L of the main body is shorter than 50 cm, or if the diameter φ of the main body is greater than 25 mm, the degree of bending becomes too hard as a whole, and it is not suitable for stretching. is not appropriate.

If the person using the stretch bar is less than 50cm in length, it will be too short to wrap around the back for adult men, and if it is longer than 70cm for women and children. , too long to handle.

As exercise using the stretching rod of the present invention, a variety of exercises can be performed, as exemplified below.
(1) Put a stick between your back and both arms when walking to stretch your back muscles (2) Grab both ends of the stick and pull it away from you while raising your arms above the back of your head. Lower the position of the stick to the back of the head so that the arms are bent at 90 degrees, and move the shoulder blades to the center (3) Hold both ends of the stick in front of the body and rotate the stick to the left and right. , Exercise to increase the flexibility of the entire arm from the wrist to the shoulder. Exercise to strengthen the muscles of both sides (5) Hold the center part of the stick with one hand and rotate the stick left and right to increase the flexibility of the wrist.

In the above-mentioned (1) back stretching exercise, which is the main exercise using the stretching rod of the present invention, the rod body 1 shown in FIG. By arranging the grips (2, 2'), both arms can be easily caught on the ends of the rod, and even when the arms are swung back and forth, the arms can be prevented from coming off the rod body 1.例文帳に追加

Furthermore, as shown in FIG. 3, by arranging the highly cushioned contact portion 3 at a position where it is most likely to contact the back, particularly in the central portion of the back, it is possible to perform long-term exercise or exercise for people with stiff bodies (arms, etc.). can not be pulled back sufficiently, and the stick body is strongly pressed against the body), damage to the back can be suppressed.

Furthermore, in other movements, the gripping portions (2, 2') and the contacting portion 3 in FIG. FIG. 6 shows an application example of the gripping portion. In FIG. 6(a), the outside diameter of the gripping portion is set to be larger (φ2>φ1) toward the end of the rod body. there is This can enhance the effect of preventing the hand holding the grip from coming off the stretching rod. Also, as shown in FIG. 6(b), it is possible to set the outer diameter of the grip portion to be thicker at both ends (φ3<φ4 or φ5) to clearly indicate the place to be grasped by hand.

It is necessary to set the outer diameter (for example, φ1 or φ3) of the grip portion 2 where the hand grips it to a thickness that is easy to grip with the hand. By setting it to 25 mm or more and 35 mm or less, it becomes possible to grip with a moderate grip strength. This outer diameter is the same for the contact portion 3 as well. It should be noted that the contact portion may be set to be thicker than the grip portion 2 by about 2 to 10 mm in order to enhance the cushioning property.

The grip part 2 or the contact part 3 is preferably made of a material softer than the rod body 1, considering that it will be gripped by hand. In addition, it is expected that the contact portion uses a material with high cushioning properties as described above. Materials with low rubber hardness such as polyurethane, silicone rubber, and natural rubber can be used as materials for the gripping portion and the contact portion, and foaming materials are more preferable.

Furthermore, it is possible not only to form the grip part 2 or the contact part 3 from a single material, but also to laminate different materials (20, 21) to form them, as shown in FIG. In this case, a softer material (or a highly foamable material) is used for the material 20 of the central part, and the material 21 of the outer part is used for tennis, badminton, etc. so that the hand holding the grip part or the like does not easily move. It is preferable to use a material that is softer than the rod body 1 and harder than the material 20 of the central portion, such as the grip tape used in .

INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is a stretching device that can be used to assist walking with the back straight, causes little damage to the human body even when used for a long time, and can be used for various exercises. It is possible to provide sticks.

REFERENCE SIGNS LIST 1 rod body 2 grip portion 3 contact portion 4 coating layer

Claims (5)

A stretching rod having a solid cylindrical resin body,
The rubber hardness of the resin used for the main body is in the range of 90 degrees or more and 98 degrees or less with a durometer tester type A that conforms to the "JIS K 6253" standard,
the length of the body is in the range of 50 cm or more and 70 cm or less;
A stretching rod, wherein the cross-sectional diameter of the main body is set in the range of 10 mm or more and 25 mm or less. 2. The stretching rod according to claim 1, wherein said resin is urethane rubber. 3. The stretching rod according to claim 1, wherein grips made of a material softer than said body are provided at both ends of said body. 4. The stretching rod according to any one of claims 1 to 3, wherein a contact portion made of a material having higher cushioning properties than the main body is provided at the center of the main body. rod. 4. The stretching rod according to claim 3, wherein said gripping portion is formed by laminating different materials.

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