Seamless ball structure

Abstract

A seamless ball structure, particularly suitable for balls used in different ball games, such as soccer, volleyball and basketball, includes an inner bladder, and an inner yarn layer, an emulsion layer and an outer cover layer sequentially provided on an outer surface of the inner bladder from inner to outer side. The emulsion layer inwardly permeates into voids among the yarns of the inner yarn layer. The outer cover layer is attached at an inner fabric layer thereof to an outer surface of the emulsion layer. The emulsion layer being heated and pressurized is in an adhering state to sufficiently tightly attach to the inner yarn layer and the outer cover layer, giving the ball so formed an increased structural strength. The ball can be easily and quickly manufactured at reduced manufacturing cost to thereby provide an improved ball structure that does not require any sewing with threads.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a seamless ball structure, and more particularly to a seamless ball structure advantageously suitable for balls of different ball games, such as soccer, volleyball and basketball.BACKGROUND OF THE INVENTION[0002]Conventionally, most of the balls for use in sports games or recreational activities, such as soccer and volleyball, have a structure including a rubber-made inner bladder forming a center of the ball and wrapped around by an outer cover formed of a canvas fabric.[0003]Please refer to FIG. 1 that shows a first conventional ball structure, which includes an inner bladder 10, an inner sewed layer 11, and an outer sewed layer 12. To manufacture the first conventional ball structure, first cut the canvas fabric into a plurality of identical and specifically shaped pieces. Then, apply an adhesive 13 on an inner surface of the pieces of the sew-up outer layer 12 for the same to attach to the pieces of the inner sewed lay...

AI Technical Summary

Benefits of technology

[0008]A primary object of the present invention is to provide a seamless ball structure that has increased structural strength and overcomes the problem of deformed and broken sewing threads as found in the conventional ball structures.

[0009]Another object of the present invention is to provide a seamless ball structure that can be easily and quickly manufactured at reduced manufacturing cost.

[0015]The ball according to the present invention is formed of an inner yarn layer, an outer cover layer and an intermediate emulsion layer without the need of sewing adjacent segments together using threads as in the prior art ball structures. Therefore, the ball according to the present invention is not disadvantageously subject to exposed or broken sewing threads under an externally applied force, and has increased structural strength. Moreover, the ball according to the present invention can be more easily and efficiently manufactured at reduced manufacturing cost to thereby provide an improved ball structure that does not require any sewing and is seamless.

Problems solved by technology

In the above-described conventional ball structure, the joints of any two adjacent pieces, that is, the seams 14 on the ball are subject to deformation when being pulled, bringing sewing threads thereat to gradually expose to external environment and even become broken when the ball has been used over a long time.

That is, the seams 34 tend to deform or break and therefore form bumps on the surface of the ball, making the ball not suitable for use.

As can be seen from the above description, in addition to their respective disadvantages, all the three conventional ball structures have the problems caused by the sewed inner and outer layers, such as deformed and broken sewing threads due to shearing stress applied thereto.

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