JP3224821U - Soft tennis ball - Google Patents

Abstract

An object of the present invention is to provide a soft tennis ball whose structure is stable and hard to break. A ball body made of a hollow sphere made of elastic rubber so as to surround a ball space therein, and a ball body protruding from a valve area in the ball body toward the ball space. A rubber valve part 31 formed integrally with the ball body from a material, and an airtight part 32 embedded in the rubber valve part 31 are provided. The airtight portion 32 is made of a rubber material having a higher rubber content than the rubber valve portion 31. [Selection diagram] FIG.

Description

  The present invention relates to a tennis ball and to a soft tennis ball.

  1 and 2 show an example of a conventional soft tennis ball. As shown in FIG. 1, the conventional soft tennis ball has two hemispherical portions 4 and a cylindrical bulb 5 bonded to the center of one of the inner peripheral surfaces of the two hemispherical portions 4. The edges of the two hemispherical portions 4 are joined so as to form a hollow spherical shape. As shown in FIG. 2, a mark portion 41 is recessed on the outer peripheral surface of the one at a position corresponding to the arrangement position of the valve 5. The valve 5 is made of elastic rubber.

  When injecting air, the tip of a needle for injecting air (not shown) is inserted from the mark portion 41 to the inside of the soft tennis ball to inject air. At this time, a gap 51 is formed in the valve 5 so as to be expanded by the insertion of the injection needle and receive the injection needle. After the injection, when the injection needle is pulled out of the soft tennis ball, the gap 51 is automatically closed by the elasticity of the valve 5, and the soft tennis ball becomes airtight. Further, in the conventional soft tennis ball, after a long time, the air inside the soft tennis ball escapes and shrinks, so that the air must be re-injected every time the soft tennis ball shrinks.

  However, in the conventional soft tennis ball, the bulb 5 is made of a material different from that of the hemispherical part 4 and is adhered to the hemispherical part 4, and there is no member that strengthens the adhesion of the bulb 5 to the hemispherical part 4. Therefore, every time the injection needle is inserted for injecting air, the valve 5 is pressed inward, and the valve 5 may be detached from the hemispherical portion 4. That is, the conventional soft tennis ball has a disadvantage that the structure is unstable.

  Therefore, an object of the present invention is to provide a soft tennis ball having a more stable structure than before.

  As a means for achieving the above object, the present invention provides the following soft tennis ball.

The soft tennis ball of the present invention
A ball body made of a hollow sphere made of elastic rubber so as to surround the ball space therein; and the ball made of the same material as the ball body so as to project from the valve area in the ball body toward the ball space. A rubber valve part integrally formed with the main body, and a hermetic part embedded in the rubber valve part, a mark part is provided on an outer peripheral surface of the valve area, and the hermetic part is The rubber content is higher than that of the rubber valve portion.

  According to the above configuration, since the rubber valve portion is formed integrally with the ball main body, the possibility that the rubber valve portion separates from the ball main body is lower than before. Therefore, the structure of the soft tennis ball according to the present invention is more stable than before.

It is an exploded perspective view showing a conventional soft tennis ball. It is a partial sectional view showing the state where a gap was formed in the conventional soft tennis ball. 1 is an exploded perspective view showing an embodiment of a soft tennis ball according to the present invention. It is a partial sectional view showing this embodiment. It is sectional drawing which shows this embodiment, and shows the state which is inject | pouring air into a soft tennis ball via the injection needle for air injection. It is sectional drawing which shows this embodiment, and shows the state which pulled out the said injection needle from the soft tennis ball.

  Hereinafter, embodiments of the soft tennis ball according to the present invention will be described with reference to the drawings.

  As shown in FIG. 3, in the present embodiment, a ball body 100 formed into a hollow sphere by elastic rubber so as to surround a ball space 10 therein, and a ball area 3 provided in the ball body 100 are used. A rubber valve portion 31 integrally formed with the ball body 100 using the same material as the ball body 100 so as to project toward the space 10, and an airtight portion 32 embedded in the rubber valve portion 31 are provided. The ball main body 100 includes a hemispherical shell-shaped first hemispherical member 1 including a bulb area 3, and a hemispherical shell-shaped second hemispherical member 2 to which the first hemispherical member 1 and edges thereof are joined together. And it was created from. The valve area 3 is located at the center of the first hemispherical member 1.

  As shown in FIG. 4, a mark portion 11 is recessed on the outer peripheral surface of the valve area 3. The rubber valve portion 31 has an extending portion 311 extending from the valve area 3 to the ball space 10 to form a hollow column, and a lid portion 312 connected to an edge of the extending portion 311. The extension part 311 and the lid part 312 together define the storage space 30. The airtight portion 32 is made of raw rubber and is housed in the housing space 30. The rubber content of the raw rubber is higher than the rubber contents of the rubber valve portion 31 and the first hemispherical member 1. When manufacturing the rubber valve portion 31 and the airtight portion 32, the same material as that of the first hemispherical member 1 is wrapped and covered by the airtight portion 32, and then the material is heated and heated so as to be integrated with the first hemispherical member 1. By the vulcanization and molding, the material surrounding and covering the airtight portion 32 becomes the rubber valve portion 31, and the airtight portion 32 is housed in the housing space 30 of the rubber valve portion 31.

  As shown in FIGS. 5 and 6, when injecting air into the soft tennis ball, the tip of the injection needle 9 for injecting air is inserted from the mark portion 11 to the ball space 10 to inject air. At this time, a slit 33 is formed in the rubber valve portion 31 and the airtight portion 32 by the injection needle 9. When the injection needle 9 is pulled out of the present embodiment after the injection, the slit 33 is automatically closed by the elasticity of the rubber valve portion 31 and the airtight portion 32, and the present embodiment becomes airtight. Further, since the airtight portion 32 is made of raw rubber having a higher rubber content than the rubber valve portion 31, the slit 33 formed in the airtight portion 32 is more closely closed, so that the airtightness of the soft tennis ball according to the present embodiment is achieved. The nature becomes high.

  According to the soft tennis ball of the present embodiment having the above-described configuration, the rubber valve portion 31 is formed integrally with the first hemispherical member 1, and the airtight portion 32 is housed in the rubber valve portion 31. Therefore, the possibility that the rubber valve portion 31 is detached from the ball body 100 is lower than before. Therefore, the structure of the soft tennis ball according to the present invention is more stable than before.

  Although the preferred embodiments and variations of the present invention have been described above, the present invention is not limited to these, and all modifications and equivalents are provided as various configurations included in the spirit and scope of the broadest interpretation. Configuration.

  The soft tennis ball according to the present invention can provide a higher commercial value as a soft tennis ball that is harder to break than a conventional product.

REFERENCE SIGNS LIST 100 ball body 1 first hemispherical member 10 ball space 11 mark portion 2 second hemispherical member 3 valve area 30 housing space 31 rubber valve portion 311 extension portion 312 lid portion 32 airtight portion 33 slit 9 injection needle

Claims (2)

A ball body made of a hollow sphere by elastic rubber so as to surround the ball space inside,
A rubber valve portion integrally formed with the ball body from the same material as the ball body so as to project from the valve area in the ball body toward the ball space;
An airtight portion embedded in the rubber valve portion,
A mark portion is recessed on the outer peripheral surface of the valve area,
A soft tennis ball, wherein the hermetic portion is made of a rubber material having a higher rubber content than the rubber valve portion. The ball body includes a hemispherical shell-shaped first hemispherical member including the valve area, and a hemispherical shell-shaped second hemispherical member in which edges of the first hemispherical member and each other are joined together. , Created from
The rubber valve section has a hollow columnar extending section extending from the valve area to the ball space, and a lid connected to an edge of the extending section,
The extending portion and the lid together define a storage space,
The soft tennis ball according to claim 1, wherein the airtight portion is housed in the housing space.

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