JP3154714U - Molding structure of tennis ball air injection valve - Google Patents

Abstract

[PROBLEMS] To select various types of air injection valves according to customer orders and to manufacture tennis balls according to necessity, so that the industrial utility value is extremely high and the economic effect is enhanced. Provide a tennis ball air injection valve molding structure that can be used. An air injection valve 30 made of the same or different material as the hemispherical shell 10 is manufactured. Thereafter, the air injection valve 30 is disposed at a predetermined position of the mold of the hemispherical shell 10. Since the air injection valve 30 is integrally sintered at a predetermined position on the inner surface of the hemispherical shell 10 when the hemispherical shell 10 is molded, it does not fall off. If necessary, a concave hole 11 for displaying the position of the air injection valve 30 is provided at a position corresponding to the air injection valve 30 on the outer surface of the hemispherical shell 10. The tennis ball is completed by combining the hemispherical shell 10 having the air injection valve 30 and the hemispherical shell not having the air injection valve. [Selection] Figure 11

Description

  The present invention relates to a molding structure of a tennis ball air injection valve, and in particular, a structure in which a spherical shell and an air injection valve are separately manufactured and assembled, so that various types of air injection valves can be selected according to customer orders. The present invention relates to a tennis ball air injection valve molding structure capable of producing a tennis ball as required.

Generally, a tennis ball is manufactured from a rubber material, and has a suitable hardness and elasticity by being injected with an appropriate amount of air or a foaming agent into a hollow interior.
As the tennis ball is used, the air inside is somewhat removed, so that the hardness and elasticity are reduced. In such a case, the hardness and elasticity are restored by reinjecting air into the tennis ball. Alternatively, if the original performance of the tennis ball cannot be recovered, it is discarded.

  In order to inject air into the tennis ball, a dedicated air injector and an air injection valve arranged at a predetermined position of the sphere are required. This air injection valve needs to have a function of preventing air inside the sphere from leaking to the outside.

  In the conventional structure of the air injection valve, the air injection valve is manufactured separately in advance, and then bonded to a predetermined position on the inner surface of the sphere constituting the tennis ball. However, such a method for adhering the air injection valve has a drawback that the adhesive adheres to the hand. Further, since the two hemispherical shells cannot be joined and molded until the adhesive of the air injection valve is dried and the bonding is completed, the manufacturing takes time and quality control is difficult. Therefore, there is a drawback that the industrial utility value is low.

  In view of such problems, as another prior art, when forming a hemispherical shell using a mold, an air injection valve is integrally formed at a predetermined position on the inner surface of the hemispherical shell, In some cases, an O-ring for preventing deformation is fitted on the lower stage, and then another hemispherical shell is joined to manufacture a tennis ball (see, for example, Patent Document 1). Such a conventional technique has a high industrial utility value because the manufacturing process can be simplified and the quality can be maintained by integrally molding the hemispherical shell and the air injection valve.

JP 2008-132300 A

  When manufacturing a tennis ball, it may be necessary to combine various types of air injection valves depending on the market or customer order. However, in the conventional technique such as Patent Document 1 described above, in such a case, when it is necessary to change the air injection valve, a different mold is required, which causes problems such as an increase in development cost. Therefore, the conventional adhesive type air injection valve has a higher industrial utility value than the method of integrally molding the hemispherical shell and the air injection valve, but in this adhesive type air injection valve, As described above, there are problems that the adhesive is easy to handle, time is required for manufacturing, quality control is difficult, and production efficiency is low. For this reason, the solution of these problems in an air injection valve was calculated | required.

  The first object of the present invention is to select various types of air injection valves according to the customer's order, and to manufacture tennis balls as required, so that the industrial utility value is extremely high. It is to provide a tennis ball air injection valve molding structure, which can enhance the economic effect.

  The second object of the present invention is to select and require various types of air injection valves without changing the mold of the spherical shell by the structure in which the air injection valve and the spherical shell are separately manufactured and combined. An object of the present invention is to provide a tennis ball air injection valve molding structure capable of producing a tennis ball according to the requirements.

  In order to solve the above-mentioned problems, a tennis ball air injection valve molding structure according to an embodiment of the present invention is arranged at a predetermined position on the inner surface of a hemispherical shell made of a rubber material constituting a tennis ball. A tennis ball air injection valve molding structure used when injecting air into the interior of the tennis ball, when manufacturing one hemispherical shell of the tennis ball, it is pre-manufactured in the cavity inside the mold. When the air injection valve is disposed and one hemispherical shell of the tennis ball is formed, the air injection valve is integrally joined to a predetermined position on the inner surface of the hemispherical shell, and the one having the air injection valve is provided. By joining the hemispherical shell and the other hemispherical shell not having the air injection valve, the tennis ball is constructed, and the two hemispherical shells and the air injection valve are separately manufactured and assembled. Yo , To order the customer selects the inflation valve of various types, characterized in that to produce a tennis ball if necessary.

  According to the tennis ball air injection valve molding structure of the present invention, it is possible to select various types of air injection valves according to customers' orders, and to manufacture tennis balls as needed, The above utility value is extremely high, and the economic effect can be enhanced, and the structure of the air injection valve and the spherical shell is manufactured and combined separately, so that various types of types can be used without changing the spherical shell mold. There is an advantage that a tennis ball can be manufactured according to need by selecting an air injection valve.

1 is a partially transparent perspective view showing a structure of a tennis ball according to a first embodiment of the present invention. Explanatory drawing which shows the manufacturing process of the tennis ball which concerns on 1st Example, and shows the state before arrange | positioning the air injection valve manufactured separately in a metal mold | die. Explanatory drawing explaining the manufacturing process which arrange | positions the air injection valve manufactured by the manufacturing process of FIG. Explanatory drawing explaining the manufacturing process which arrange | positions and joins the semi-closed shell after the manufacturing process of FIG. 3 and the semi-closed shell which does not have an air injection valve to an upper and lower mold, respectively. Sectional drawing which shows the structure of the tennis ball manufactured by the manufacturing process of FIG. Sectional drawing which shows the structure of the tennis ball which concerns on 2nd Example of this invention. FIG. 7 is a partially transparent perspective view showing the structure of the tennis ball of FIG. 6. Sectional drawing which shows a mode that an injection needle type | mold air injector is inserted in the tennis ball which concerns on 2nd Example. Sectional drawing which shows the structure of the tennis ball which concerns on 3rd Example of this invention. Sectional drawing which shows a mode that an injection needle type | mold air injector is inserted in the tennis ball of FIG. FIG. 10 is a cross-sectional view showing a state where a hollow rod-like air injector without a pointed tip is inserted into the tennis ball of FIG. 9. The perspective view which concerns on 4th Example of this invention and shows a structure at the time of applying to a hard tennis ball. The perspective view which shows the 1st modification of the hard tennis ball of FIG. The perspective view which shows the 2nd modification of the hard tennis ball of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIGS. 1 to 5 relate to a first embodiment of the present invention. FIG. 1 is a partially transparent perspective view showing a structure of a tennis ball according to the first embodiment. FIGS. 2 to 5 are first embodiments. It is explanatory drawing explaining the manufacturing process of the example tennis ball.

  As shown in FIGS. 1 to 5, the tennis ball constructed using the tennis ball air injection valve forming structure of the first embodiment has two hemispherical shells 10, 20 and an air injection valve 30. The hemispherical shell 10 and the hemispherical shell 20 are bonded to each other.

  The two hemispherical shells 10 and 20 are manufactured by molding a rubber material. In the case where one of the two hemispherical shells 10 and 20 is molded, the above-mentioned hemispherical shell 10 is separately manufactured in the mold cavity for molding the hemispherical shell 10 before the hemispherical shell 10 is molded. The hemispherical shell 10 is formed by disposing the air injection valve 30.

  The air injection valve 30 is manufactured from the same rubber material as the hemispherical shell 10 or a natural rubber or synthetic rubber different from the hemispherical shell 10.

  The air injection valve 30 has a function of preventing the air inside the sphere from leaking to the outside, and is not limited to the configuration shown in FIGS. For example, a type with a gap hole or a type without a gap hole may be used.

  When the hemispherical shell 10 is molded, the air injection valve 30 is integrally sintered at a predetermined position on the inner surface of the hemispherical shell 10 so that the air injection valve 30 does not fall off.

Next, a method for manufacturing a tennis ball according to the first embodiment will be described with reference to FIGS.
2-5 is explanatory drawing explaining the manufacturing process of the tennis ball based on 1st Example, FIG. 2 is explanatory drawing which shows the state before arrange | positioning the air injection valve manufactured separately in a metal mold | die. 3 is an explanatory diagram for explaining a manufacturing process for manufacturing a semi-hidden shell by arranging the air injection valve manufactured by the manufacturing process of FIG. 2 in a mold, and FIG. 4 shows a semi-hiking shell after the manufacturing process of FIG. FIG. 5 is a cross-sectional view showing the structure of a tennis ball manufactured by the manufacturing process of FIG. Each figure is shown.

  In the tennis ball air injection valve molding structure of the present embodiment, first, the air injection valve 30 is manufactured, and then the air injection valve 30 is changed to various air injection valves 30 as required by the method of joining with the hemispherical shell 10. Can meet the demands of manufacturing tennis balls.

  Describing a manufacturing method for forming a tennis ball, an operator prepares the air injection valve 30 separately manufactured in advance as shown in FIG. Then, as shown in FIG. 3, the worker arranges the prepared air injection valve 30 in the mold cavity of the hemispherical shell 10 in advance, thereby manufacturing the hemispherical shell 10 having the air injection valve 30.

  Thereafter, the operator manufactures the hemispherical shell 20 using the mold cavity of the hemispherical shell 20 that does not have the air injection valve 30. In this case, as shown in FIG. 4, the hemispherical shell 10 having the air injection valve 30 and the hemispherical shell 20 not having the air injection valve 30 are respectively disposed in the cavities of the upper and lower molds. Then, for example, the operator performs an operation of joining the mold cavity of the hemispherical shell 10 having the air injection valve 30 to the mold cavity of the hemispherical shell 20 not having the air injection valve 30.

  In this case, the operator applies an adhesive to the joining surface of the two hemispherical shells 10 and 20 and simultaneously injects an appropriate amount of foaming agent or pressurized air between the two hemispherical shells 10 and 20. Thereafter, the operator closes and heats the upper and lower molds.

  Then, the two hemispherical shells 10 and 20 are bonded together by an adhesive, and at the same time, the foaming agent inside expands due to the thermal expansion action, so that the two hemispherical shells 10 and 20 become the upper and lower mold cavities. Since it is pressed by the inner wall, it becomes a sphere and the tennis ball of the first embodiment as shown in FIG. 5 is completed.

  As described above, in the tennis ball air injection valve molding structure according to this embodiment, the air injection valve 30 and the hemispherical shell 10 are manufactured separately. Can be made from the same or different materials.

  Thereby, the air injection valve 30 which consists of various materials is employable. That is, according to the customer's order, various types of air injection valves 30 can be arranged in the mold of the hemispherical shell 10 to manufacture the hemispherical shell 10 having various types of air injection valves 30. Thereafter, the tennis ball of the first embodiment is completed by joining the hemispherical shell 10 having the air injection valve 30 and the hemispherical shell 20 not having the air injection valve 30 as described above.

  As described above, according to the first embodiment, the air injection valve 30 and the two hemispherical shells 10 and 20 are manufactured separately, so that various types of air injection valves 30 can be provided according to customer orders. The tennis ball can be manufactured as needed.

  Moreover, since the change of the air injection valve 30 does not affect the mold, the bonding process, and the drying time, the overall work efficiency is not affected, and the manufacturing process can be simplified and the quality can be maintained. Thereby, industrial utility value and practical value are extremely high, and the economic effect can be enhanced.

  In addition, you may comprise the shaping | molding structure of the air injection valve of the tennis ball which concerns on 1st Example like the 2nd Example, 3rd Example, and 4th Example which are mentioned later. Such an embodiment will be described later.

(Second embodiment)
6 is a sectional view showing the structure of a tennis ball according to a second embodiment of the present invention, FIG. 7 is a partially transparent perspective view showing the structure of the tennis ball of FIG. 6, and FIG. 8 is a second embodiment. It is sectional drawing which shows a mode that an injection needle type | mold air injector is inserted in the tennis ball which concerns on.

  As shown in FIG. 6, the tennis ball according to the second embodiment is substantially the same as the configuration of the tennis ball in the first embodiment, but at the position corresponding to the air injection valve 30 on the outer surface of the hemispherical shell 10, A concave hole 11 is provided. An adhesive 12 is applied on the concave hole 11.

  The concave hole 11 can represent the position of the air injection valve. Therefore, since the position of the air injection valve 30 can be represented by providing the concave hole 11, the injection needle type air injector 1 as shown in FIG. It is convenient to insert the container 2 (see FIG. 11) into the air injection valve 30, and the air injection operation can be simplified.

  The tennis ball air injection valve forming structure and the tennis ball manufacturing method according to the second embodiment are the same as those of the first embodiment.

  Therefore, according to the second embodiment, in addition to obtaining the same effect as the first embodiment, since the position of the air injection valve 30 can be expressed by providing the concave hole 11, the injection needle type It becomes easy to insert the air injector 1 or the hollow rod-shaped air injector 2 with no sharp tip into the air injection valve 30, and the effect of simplifying the air injection operation is obtained.

(Third embodiment)
9 is a cross-sectional view showing a structure of a tennis ball according to a third embodiment of the present invention, FIG. 10 is a cross-sectional view showing a state where an injection needle type air injector is inserted into the tennis ball of FIG. 9, and FIG. FIG. 10 is a cross-sectional view showing a state where a hollow rod-like air injector without a pointed tip is inserted into the tennis ball of FIG. 9.

  As shown in FIG. 9, the tennis ball according to the third embodiment is substantially the same as the configuration of the tennis ball in the second embodiment, but is further configured by providing a gap hole 32 in the air injection valve 30. Yes. Of course, the air injection valve 30 may be configured as shown in FIG. 2 (first embodiment) or FIG. 6 (second embodiment) without the gap hole 32.

  When injecting air into a tennis ball, as shown in FIG. 10 or FIG. 11, an injection needle type air injector 1 or a hollow rod-shaped air injector 2 (see FIG. 11) without a point is used. It is inserted into the injection valve 30 to inject air into the tennis ball.

  In this case, since the gap hole 32 is provided, it is possible to easily perform the air injection operation using the injection needle type air injector 1 or the hollow rod-shaped air injector 2 having no sharp tip. Moreover, the function which prevents that the air inside a spherical body leaks outside by providing the clearance hole 32 is acquired.

  The tennis ball air injection valve forming structure and the tennis ball manufacturing method according to the third embodiment are the same as those of the second embodiment.

  Therefore, according to the third embodiment, in addition to the same effect as the second embodiment, the air injection valve 30 provided with the gap holes 32 prevents the air inside the sphere from leaking to the outside. At the same time, it is possible to easily perform the air injection operation using the injection needle type air injector 1 or the hollow rod-shaped air injector 2 having no sharp tip.

  Although the tennis ball according to the first to third embodiments has been described as being configured as a soft tennis ball, the present invention is not limited to this, and is effective even when configured as a hard tennis ball, for example. Such an embodiment will be described later.

(Fourth embodiment)
12 is a perspective view showing a structure when applied to a hard tennis ball according to a fourth embodiment of the present invention, FIG. 13 is a perspective view showing a first modification of the hard tennis ball of FIG. 12, and FIG. FIG. 13 is a perspective view showing a second modification of the hard tennis ball in FIG. 12.

  As shown in FIG. 12, the tennis ball according to the fourth embodiment is configured in the same manner as the tennis ball in the first and second embodiments, but is configured as a hard tennis ball.

  Specifically, in the hard tennis ball according to the fourth embodiment, for example, two 8-shaped felt portions 40 and 50 are attached to the outer surface of the sphere of the tennis ball according to the first to third embodiments. Thus, it is configured as a hard tennis ball.

  The air injection valve 30 is configured to have the concave hole 11 in the second embodiment. Of course, you may comprise using the air injection valve of a structure other than this.

  Other tennis ball air injection valve forming structures and tennis ball manufacturing methods are the same as in the first to third embodiments.

  Therefore, according to the fourth embodiment, not only the soft tennis ball but also the hard tennis ball is configured, the same effect as in the first to third embodiments can be obtained.

  In the fourth embodiment, the concave hole 11 of the air injection valve 30 is provided at a predetermined position of one of the felt portions 40, but is not limited to this position. For example, the first modification shown in FIG. As shown in the figure, it may be configured to be provided at a joint position between two eight-shaped felt parts 40 and 50 or at a predetermined position of the other felt part 50 as shown in the second modification of FIG.

  As can be seen from the above description, in the tennis ball air injection valve molding structure of the first to fourth embodiments, the two hemispherical shells 10 and 20 and the air injection valve 30 are manufactured separately. First, the air injection valve 30 is manufactured from the same or different material as the hemispherical shell 10. Thereafter, when the air injection valve 30 is disposed at a predetermined position of the mold of the hemispherical shell 10 and the hemispherical shell 10 is molded, the air injection valve 30 is integrally sintered at a predetermined position on the inner surface of the hemispherical shell 10. The air injection valve 30 does not fall off.

  If necessary, the recessed hole 11 may be provided at a position corresponding to the air injection valve 30 on the outer surface of the hemispherical shell 10 as in the second embodiment. An adhesive 12 is applied on the concave hole 11. The position of the air injection valve 30 can be displayed by the concave hole 11.

  A tennis ball is completed by combining the hemispherical shell 10 in which the air injection valve 30 is disposed and the hemispherical shell 20 having no air injection valve.

  Therefore, by separately manufacturing the air injection valve 30 and the two hemispherical shells 10 and 20, various types of air injection valves 30 are selected according to customer orders, and tennis balls are manufactured as required. be able to. Moreover, since the change of the air injection valve 30 does not affect the mold, the bonding process, and the drying time, the overall work efficiency is not affected. Therefore, the tennis ball air injection valve molding structure according to the first to fourth embodiments has high industrial utility value and practical value.

  As described above, the molded structure of the tennis ball air injection valve of the first to fourth embodiments is selected according to the customer's order according to the structure, and the tennis ball as required is selected. Since it can be manufactured, problems and disadvantages in the prior art can be solved. That is, the industrial utility value is extremely high, and the economic effect can be enhanced.

  The present invention is not limited to the embodiments and modifications described above, and various modifications can be made without departing from the spirit of the invention.

1 ... Needle-type air injector,
2 ... Hollow rod-shaped air injector,
10 ... hemispherical shell,
11 ... concave hole,
12 ... Adhesive,
20 ... hemispherical shell,
30 ... Air injection valve,
32 ... Gap hole,
40 ... felt part,
50 ... Felt part.

Claims (8)

A tennis ball air injection valve molding structure that is disposed at a predetermined position on the inner surface of a hemispherical shell made of a rubber material constituting a tennis ball and is used when air is injected into the interior via an air injector,
When manufacturing one hemispherical shell of the tennis ball, the pre-manufactured air injection valve is disposed in a cavity inside a mold, and when forming one hemispherical shell of the tennis ball, the air injection valve Are integrally joined to a predetermined position on the inner surface of the hemispherical shell, and the tennis ball is joined by joining one hemispherical shell having the air injection valve and the other hemispherical shell not having the air injection valve. Configure
By separately manufacturing and assembling the two hemispherical shells and the air injection valve, various types of air injection valves are selected according to customer orders, and tennis balls are manufactured as required. Tennis ball air injection valve molding structure.   2. The tennis ball air injection valve forming structure according to claim 1, wherein a concave hole representing a position of the air injection valve is provided at a position corresponding to the air injection valve on an outer surface of the hemispherical shell. .   3. The tennis ball air injection valve molding structure according to claim 1, wherein the air injection valve is manufactured from the same material as the material of the hemispherical shell.   3. The tennis ball air injection valve forming structure according to claim 1, wherein the air injection valve is manufactured from a material different from a material of the hemispherical shell. 4.   5. The tennis ball air injection valve forming structure according to claim 1, wherein a gap hole is not provided in the air injection valve. 6.   The tennis ball air injection valve forming structure according to any one of claims 1 to 4, wherein the air injection valve is provided with a gap hole.   The tennis ball air injection valve forming structure according to any one of claims 1 to 6, wherein the tennis ball is a soft tennis ball.   The tennis ball air injection valve forming structure according to any one of claims 1 to 6, wherein the tennis ball is a hard tennis ball.

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