JP2544929Y2 - Exercise ball - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exercise ball .

[0002]

2. Description of the Related Art FIG. 5 shows a typical structure of a conventional exercise ball, for example, a valve for a soccer ball, volleyball, basketball or the like. In the drawing, 1 is a tube made of butyl rubber, 2 is a reinforcing layer formed by winding a nylon thread or the like on the surface of the tube 1 on an endless track, and 3 is a natural or synthetic leather panel bonded to a plurality of the reinforcing layers 2. The skin layer 4 is a rubber valve adhered to the inside of the tube 1, 5
Is a rubber pad attached to the valve 4. Musi Rubber 5
Is formed in a columnar shape, and a flange 6 is formed in the middle. Reference numeral 7 denotes a minute hole into which the air injection needle is inserted, and is formed along the center of the worm rubber 5 to a substantially middle portion of the worm rubber 5. Reference numeral 8 denotes a cut surface formed from the minute hole 7 to the tip of the worm rubber 5. The valve 4 has a rubber pad 5
The hole 9 has a shape slightly smaller than the outer shape of the hole 9. That is, it is composed of small-diameter portions 10 and 11 and a large-diameter portion 12 formed in the middle thereof.

[0003] The valve 4 having the above structure is manufactured by an upper mold 13 and a lower mold 14 shown in FIG. Reference numeral 15 denotes a substantially cylindrical pin protruding from the lower surface of the upper mold 13.
A large diameter portion 16 is formed in the middle. Reference numeral 17 denotes a concave cavity formed on the upper surface of the lower mold 14. In manufacturing the valve 4, unvulcanized rubber is charged into the cavity 17 with the upper and lower dies 13, 14 opened, the upper and lower dies 13, 14 are clamped, and vulcanization is performed by heating. It is formed by doing.

[0004]

In the valve 4 having the above-described structure, the mounting holes 9 for the worm rubber 5 are located in the order of the small diameter portion 10, the large diameter portion 12, and the small diameter portion 11. Therefore, when manufacturing the hole 9, the large-diameter portion 16 of the pin 15 is difficult to come off from the valve 4, and not only requires a considerable amount of force to complicate the operation, but also reduces the small-diameter portion 18 above the large-diameter portion 16. There was a risk of damage.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve such a drawback, and is a block to which a valve is adhered.
A small hole is formed on the inner surface of the ladder, and
A thick part is formed around the inner surface of the ladder.
Is bonded to the through hole where the rubber is mounted and the thick part
Made of an elastomer having a flat surface,
The hole is located on the surface side to be bonded to the inner surface of the bladder.
A large diameter portion having a diameter larger than the small hole,
And a small-diameter portion communicating therewith .

[0006]

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 3, reference numeral 20 denotes two hollow hemispheres made of a thermoplastic elastomer having a thickness of about 0.5 to 3.0 mm, for example, a polyester-based thermoplastic elastomer Hytrel (registered trademark). A bladder 23 formed by heating and fusing the ends of 22 and 22 to form a hollow sphere having a diameter of about 10 to 30 cm is a valve adhered to the inner surface of the bladder 20, that is, the center of one hollow hemisphere. In addition, it is formed in a substantially hemispherical shape with a thermoplastic elastomer such as polyester, polyurethane, or polyamide. A small hole 24 having a diameter of about 6 to 8 mm is formed on the inner surface of the bladder 20 to which the valve 23 is adhered, and the small hole 24 has a width L of about 4 to 6 mm and a height T of about 6 to 8 mm. A thick portion 25 of 2 to 3.5 mm is formed in a ring shape. The valve 23 has a ring-shaped flat surface 26 having an outer diameter of approximately 13 to 18 mm and an inner diameter of approximately 9 to 10 mm, and this surface is bonded to the thick portion 25 with an adhesive such as a urethane-based adhesive and heat-sealed. , High frequency welding, ultrasonic welding and the like. The valve 23 has a through hole 27 formed at the center thereof, into which the rubber 5 is mounted.
Reference numeral 7 denotes a large-diameter portion 28 having a diameter of about 9 to 10 mm and a depth of about 3.5 to 4.0 mm located on the side of the adhesive surface to the bladder 20, that is, the flat surface 26, and a diameter of about 4 which communicates with the internal space of the bladder 20. .5-
It is composed of a small-diameter portion 29 having a size of 5.0 mm and a length of about 8 to 9 mm. The worm rubber 5 has a diameter of about 6 to 7 mm provided on the bladder 20,
The small hole 30, the large diameter portion 28 and the small diameter portion 29 of the through hole of the valve 23 are mounted on the small diameter portion 29 and have a shape slightly larger than the shape of each of the above holes. The flange 6 of the worm rubber 5 is fitted into the large-diameter portion 28, and the worm rubber 5 is fixed to the valve 23 in a state in which it is hard to come off.

3 is a chloroprene system on the surface of the bladder 20,
It is a skin layer composed of a plurality of natural or synthetic leather panels bonded through a polyurethane adhesive or the like. In the case of a soccer ball, it is composed of 12 pentagonal leather panels and 20 hexagonal leather panels. You.

FIG. 4 shows a mold for manufacturing the valve 23. A pin 32 having a substantially columnar shape, that is, a shape slightly smaller than the shape of the elastic rubber 5 (FIG. 1) is provided on the lower surface of the upper mold 31. It has a large diameter portion 33 at its base and a small diameter portion 34 following the large diameter portion 33. In addition, lower mold 3
5 is provided with a substantially hemispherically concave cavity 36 in which an elastomer material is charged into a portion facing the pin 31. The tip of the pin 32 is in contact with the center of the cavity 36. In the case of a thermoplastic elastomer as the elastomer material, a heated and melted material is injected between the upper and lower molds 31 and 35 via a gate (not shown) to form the valve 23.

After molding, the upper and lower dies 31, 35 are divided into upper and lower parts, and the valve 23 is removed from the dies. At this time, since there is no undercut portion in the valve 23, no force is required for its removal.

[0011]

According to the present invention, the valve to which the valve is bonded is provided.
A thick part is formed around the small hole on the inner surface of the ladder.
This increases the bladder's strength in this area,
The problem that the portion swells and deforms does not occur . Further, according to the present invention, since the large diameter portion of the valve into which the worm rubber flange is fitted is located on one side of the valve, the large diameter portion does not become undercut. Therefore, the valve can be easily removed from the mold without any force,
In addition, the problem of damage to the valve, which has conventionally occurred during the removal work, is also solved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a valve portion of a motion ball according to an embodiment of the present invention.

FIG. 2 is a sectional perspective view of a valve.

FIG. 3 is a sectional view of an exercise ball.

FIG. 4 is a sectional view showing a mold for manufacturing a valve.

FIG. 5 is a sectional view of a conventional example.

FIG. 6 is a sectional view of a conventional mold.

[Explanation of symbols]

 Reference Signs List 20 bladder 21, 22 hollow hemisphere 23 valve 5 worm rubber 27 through hole 28 large diameter portion 29 small diameter portion 31 upper mold 32 pin 35 lower mold 36 cavity

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-49949 (JP, A) JP-A-62-116759 (JP, U) JP-B-25-4564 (JP, B1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A thermoplastic elastomer two hollow hemisphere made of melt bonded formed by bonding the valve to the inner surface of the bladder formed into a hollow sphere athletic ball Lumpur, the
A small hole is formed on the inner surface of the bladder to which the valve is bonded, and a thick portion is formed around the inner surface of the bladder of the small hole. The through hole is made of an elastomer having a flat surface bonded to the thick portion, and the through hole communicates with the large diameter portion having a larger diameter than the small hole located on the surface side bonded to the bladder inner surface, and the bladder inner surface space. An exercise ball comprising a small-diameter portion having a small diameter.