Ball for ball game

#The present invention relates to ball for ball games such as a soccer ball, a handball, a volleyball and the like.

#Conventionally, there have been two kinds of balls for ball games having an air charging structure, for example, a laminated ball and a hand stitched ball.

#As disclosed in the specification of U.S. Pat. No. 4,333,648, for example, the laminated ball comprises a rubber bladder made of air impermeable rubber and having a spherical hollow body into which compressed air is charged through a valve, a reinforced layer formed by winding a fiber such as a nylon filament having several thousands meters onto the bladder in every circumferential direction in order to stabilize the quality of the ball (weight, size, sphericity, durability, shape maintenance, and an enhancement in strength for a change with the passage of time), a cover rubber layer made of a thin vulcanized rubber layer bonded onto the reinforced layer, and an outermost layer including a plurality of leather panels bonded onto the cover rubber layer. The cover rubber layer has the function of tightly bonding the leather panel onto the ball. An artificial leather panel or a natural leather panel is used for the leather panel. In many cases, an end of the back of the leather panel is usually cut obliquely (which is referred to as diagonally cutting), and a trench having an almost V shape is formed on a leather panel joint.

#FIG. 1 is a perspective view showing a ball for a ball gave according to an embodiment of the present invention, a part of which being cut away;

#FIG. 2 is a sectional view taken along the line A—A in FIG. 1;

#FIG. 3 is a plan view showing the back of a leather panel;

#Next, a ball for a ball game according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

#Embodiment 1

#In FIG. 1, the reference numeral 1 denotes an example of a soccer ball and the reference numeral 2 denotes a bladder made of an elastic material having air impermeability such as butyl rubber in the form of a spherical hollow body, into which compressed air is charged. The reference numeral 3 denotes a valve for injecting the compressed air into the bladder 2, an internal pressure being set to about 1.0 kg/cm2. The reference numeral 4 denotes a reinforced member formed by winding a fiber, for example, a nylon filament having a length of about 3000 m onto the surface of the bladder 2 in every direction on a circumference. The quality of the ball can be enhanced and stabilized by the reinforced layer 4 as described above. The reinforced layer 4 can be formed by overlapping a plurality of woven fabrics such as cotton fabrics together and sticking them onto the surface of the bladder 2 or sewing the woven fabrics spherically as well as winding a thread as described above. In addition, elastomer such as polyurethane, polyester, nylon or polyolefine which is molded spherically or rubber blended with a reinforced fiber can be used as the bladder. The bladder having such a structure itself has a reinforcing function. Therefore, a special reinforced layer does not need to be provided. The reference numeral 5 denotes a cover rubber layer made of natural rubber or the like which is formed on the reinforced layer 4, and the reference numerals 6 denote a leather panel bonded onto the cover rubber layer 5 with an adhesive such as a CR (chloroprene) based adhesive. A thickness adjusting member 10 which will be described below is bonded onto the back of the leather panel 6.