JP3039027U - Large ball for rolling - Google Patents

Abstract

(57) [Summary] (Correction) [PROBLEMS] To provide a large ball for ball rolling that is less likely to cause air leakage and is easy to repair and expands with air pressure. SOLUTION: An inner tube 2 made of a plurality of rubber sheets is formed into a cylindrical body so as to reduce the number of bonding points, and is housed in a flexible inelastic ball skin so that it can be taken in and out. When air is supplied to the inner tube via the air supply / exhaust valve 24, the inner tube that expands into an approximately elliptic shape is restricted by the ball skin and forms a spherical shape.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a ball used in a large ball rolling competition that is performed at a sports day or the like.

[0002]

[Prior art]

 Conventionally, balls made by woven rattan or bamboo into a ball shape and pasted with paper have been used for large ball rolling competitions that are held at sports events, etc. There was a problem that it could not be used. There are also cases where beach balls are used instead, but there was the problem that they were blown away by the wind because they were too light.

Japanese Utility Model Registration No. 3025954 proposes a ball for rolling a ball which solves the above problems. This consists of an outer sphere formed by connecting multiple pieces and an inner sphere formed in the same way.The inner sphere is housed in the outer sphere and fixed at two opposite poles to form the same body, It is used by injecting air into the inner sphere.

[0004]

[Problems to be solved by the device]

 However, in the above invention, since the inner sphere is formed by connecting a plurality of small pieces, there are many connecting points, air leakage easily occurs, and the number of manufacturing processes increases. Also, since the outer and inner spheres are fixed, it is not easy to repair and reuse one of them even if the outer or inner sphere is damaged, and the ball itself must be replaced with a new one. I have to.

The present invention has been made in order to solve the above problems, and provides a large ball for rolling which is resistant to air leakage, easy to repair, and easy to manufacture.

[0006]

[Means for Solving the Problems]

 The present invention is a spherical ball skin having an opening / closing part made of a flexible and non-elastic sheet, and is stored in such a state that the ball skin can be taken in and out through the opening / closing part. A ball consisting of an inner tube made of rubber that is equipped with a valve for air supply and exhaust and expands by air pressure.When the inner tube is not expanded, it has a cylindrical shape, and when expanded, it is in close contact with the inner surface of the ball skin and has a spherical shape. It will be. Further, in the present invention, the inner tube is formed into a hermetically sealed cylindrical body by forming a rectangular rubber sheet into a cylindrical body shape and adhering disk-shaped rubber sheets to both ends thereof.

With such a configuration, since the inner tube is formed into a cylindrical body, the number of bonding points is very small, air leakage does not easily occur, and the number of manufacturing processes is reduced. Also, since the inner tube can be taken out from the ball skin, repair is easy and only one of them can be replaced.

[0008]

[Action]

 When using, first insert the inner tube from the opening / closing part of the ball skin, and then inject air into the inner tube from the supply / exhaust valve provided on the inner tube with a pump or the like.

The inner tube in the ball skin expands by the air pressure supplied from the air supply / exhaust valve until it comes into close contact with the inner surface of the ball skin. At this time, since the ball skin is a non-elastic body, the expansion of the inner tube is regulated by closely adhering to the inner surface of the ball skin, and a spherical shape can be formed along the inner surface of the ball skin.

When the air supply to the inner tube is completed, the air supply / exhaust valve is closed and the opening / closing part is closed. When not in use, the inner tube can be deflated and folded with the ball skin for storage and storage.

[0011]

[Embodiment of the invention]

 Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a ball skin, which is composed of a plurality of elliptical sheets 13 obtained by cutting a non-elastic flexible sheet obtained by laminating a resin such as vinyl chloride on a nylon woven fabric sheet into a substantially elliptical shape, and the upper and lower poles. The two circular sheets 14 are welded or sewn together into a spherical shape. Reference numeral 12 denotes an opening / closing portion formed on one elliptical sheet 13.

As shown in FIG. 2, the opening / closing part 12 can be easily opened and closed by a fastener or the like. Reference numeral 15 is a sheet piece made of the same material as that of the ball skin 1 provided inside the opening / closing portion 12, and a circular hole 16 is formed at substantially the center. An inner tube supply / exhaust valve is fitted into the hole 16. Further, the sheet piece 15 is located between the inner tube and the opening / closing section 12, and has a function of preventing the inner tube from being damaged by the contact with the metal portion of the fastener.

3 and 4 show the structure of the inner tube 2. As shown in the figure, first, an air supply / exhaust hole 23 having a diameter of about 4 mm is formed in a flat rectangular sheet having a thickness of about 1 mm, which is made of an elastic material such as unvulcanized butyl rubber, and molded with a material such as EP rubber. The substantially pyramidal air supply / exhaust valve 24 is bonded. At this time, in order to more securely attach the air supply / exhaust valve 24, a valve adhesive patch 25 made of the same material as that of the above-mentioned sheet is used and adhered to the air supply / exhaust hole 23 with an adhesive.

Next, the sheet is formed into a cylindrical shape, the ends thereof are overlapped and bonded with an adhesive to form a body portion 21. The width of this bonded portion may be about 10 mm. Further, a disc-shaped rubber sheet 22 made of unvulcanized butyl rubber having a thickness of 1 mm is adhered to the upper surface and the bottom surface of the body portion 21 with an adhesive to form the inner tube 2 of the sealed cylindrical body, and thereafter, Heat vulcanize. This heat vulcanization increases the adhesive strength of each part. The adhesive is a solution of butyl rubber and toluene. In the above-described embodiment, the inner tube 2 is formed by adhering an unvulcanized rubber sheet into a cylindrical body and then heat-vulcanized. However, instead of this, the vulcanized rubber sheet is used as a cylindrical body by using a rubber adhesive. You may adopt the method of forming in.

The valve cap 26 is fitted into the air supply / exhaust valve 24 to seal the inner tube 2, and is made of vinyl chloride resin or the like.

When not in use, as shown in FIG. 5, the deflated cylindrical inner tube 2 is housed in the ball skin 1 and can be folded and stored.

When air is introduced into the inner tube 2 through the air supply / exhaust valve 24 at the time of use, the inner tube 2 expands as shown in FIG. 6 to form a spherical shape along the inner surface of the ball skin 1. . Here, the cylindrical inner tube 2 becomes a substantially elliptic spherical shape due to expansion, but since the ball skin is a sphere made of an inelastic material, the inner tube 2 is restricted by the ball skin 1 and becomes spherical.

[0018]

【Example】

 As for the size of the inner tube with respect to the ball skin, for example, in the case of a ball skin having a diameter of about 1 m, a cylindrical inner tube having a diameter of about 62 cm and a height of about 60 cm is suitable. In addition, if the ball skin has a diameter of about 1.3 m, the diameter of the cylinder is about 80 cm and the height is about 78 cm. If the ball skin has a diameter of about 1.2 m, the diameter of the cylinder is about 74 cm and the height is about 72 cm. With a ball skin of about 85 cm, a ball with a diameter of about 53 cm and a height of about 51 cm can be produced, and a ball suitable for rolling a large ball can be realized. The difference in the diameter of the balls is selected according to the age of the children to be used. If the opening / closing part 12 has a length of about 50 cm, the inner tube 2 can be easily taken in and out. The present invention is not limited to the above size, and can be used for a large rolling ball of any size as long as the ratio is the same as the above size.

[0019]

[Effect of the invention]

 According to the present invention, since the inner tube is a cylindrical body, there are few bonding points, and it can be easily manufactured, and air leakage does not easily occur, and its durability is improved.

Further, according to the present invention, since the inner tube can be put in and taken out from the ball skin, repair can be easily performed, and even if either one is damaged, the damaged one can be taken out and repaired. It is economical because it can be replaced with a new one.

[Brief description of the drawings]

FIG. 1 is a front view of a large ball for rolling according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which an opening / closing section is opened.

FIG. 3 is a configuration diagram of an inner tube.

FIG. 4 is an enlarged sectional view of a supply / exhaust valve.

FIG. 5 is a schematic cross-sectional view showing a state when not in use.

FIG. 6 is a schematic cross-sectional view showing a state during use.

[Explanation of symbols]

 1 ... Ball skin 2 ... Inner tube 12 ... Opening / closing part 13 ... Elliptical seat 14 ... Circular seat 15 ... Seat piece 16 ...・ ・ ・ ・ Hole 21 ・ ・ ・ ・ ・ Body 22 ・ ・ ・ Disc-shaped rubber sheet 23 ・ ・ ・ Air supply / exhaust hole 24 ・ ・ ・ Air supply / exhaust valve 25 ・ ・ ・ Valve adhesive patch 26-Valve cap

Claims (2)

[Utility model registration claims] 1. A spherical ball skin made of a flexible and non-elastic sheet and having an opening / closing portion, and stored in such a state that the ball skin can be taken in and out through the opening / closing portion. A ball consisting of a rubber inner tube that is provided with a valve for air supply and exhaust and expands by air pressure, and has a cylindrical shape when the inner tube is not expanded,
A ball for rolling large balls, which is in a spherical shape when it is in close contact with the inner surface of the ball when expanded. 2. The inner tube is formed into a sealed cylindrical body by forming a rectangular rubber sheet into a cylindrical body shape and adhering disk-shaped rubber sheets to both ends thereof. Large ball for rolling as described.