Abstract: A ball inflation valve includes a valve body extended into an inflatable inner bladder of a ball and having an axial bore and an annular flange portion; a valve core partially held in the axial bore of the valve body and having an air hole; a canvas superimposing layer flatly superimposed on the annular flange portion of the valve body to locate around the valve core; and a protective top including a sleeve portion enclosing a length of the valve core exposed from the valve body and a locating flange portion radially outward extended from the sleeve portion to locate between a surface cover of the ball and the valve body and the valve core, so that any sulfide from the valve body and the valve core will attach to an inner side of the protective top without forming a yellowing smudge on the ball surface cover.

Abstract: A ball inflation valve includes a valve body extended into an inflatable inner bladder of a ball and having an axial bore and an annular flange portion; a valve core partially held in the axial bore of the valve body and having an air hole; a canvas superimposing layer flatly superimposed on the annular flange portion of the valve body to locate around the valve core; and a protective top including a sleeve portion enclosing a length of the valve core exposed from the valve body and a locating flange portion radially outward extended from the sleeve portion to locate between a surface cover of the ball and the valve body and the valve core, so that any sulfide from the valve body and the valve core will attach to an inner side of the protective top without forming a yellowing smudge on the ball surface cover.

Abstract: A stitch-free football structure includes a ball bladder formed by providing a yarn layer on an outer surface of an inflatable bladder and a glue layer on an outer side of the yarn layer, and a prolate-spheroidal structure formed by adjoining curved panels having configuration corresponding to the ball bladder and glued to an outer side of the glue layer; and a lacing-shaped patch glued to a seam between two adjoining curved panels to meet a required football configuration. In a method of manufacturing the stitch-free football structure, a plurality of curved panels is prepared in advance by hot press molding, and the curved panels are joined and attached to a ball bladder by gluing. Thus, the procedures for manufacturing a football are simplified, the bad yield in manufacturing is reduced, and the produced football is more durable for use, has more precise dimensions, and beautiful and even exterior appearance.

Abstract: A ball inner bladder structure, particularly suitable for a seamless ball, includes a bladder in the form of a spherical bag, a yarn layer enclosing the bladder, an emulsion layer applied over the yarn layer, and a ball cover layer bonded to the emulsion layer. The yarn layer is an integrally knitted web structure having a 3D spherical shape. Knitted yarns subjected to pressure can displace relative to one another to finely adjust a surface configuration of the web structure for the same to completely bear against the bladder. The emulsion layer fills up voids on the yarn layer to provide a smooth spherical surface. The specifically knitted yarn layer can effectively control an expansion degree of the bladder when the same is inflated. And, expansion or compression pressure applied to the bladder is uniformly distributed over interlocking points of knitted yarns, preventing the bladder from deformation and breaking.

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.

Abstract: A system for applying RFID in ball game field to assist in making a decision in ball game includes a RFID tagging element embedded in a ball used in the game; a plurality of RFID reading devices spaced along borderlines of the ball game field for reading the RFID tagging element in the ball; and a control center connected to the RFID reading devices. When the ball with embedded RFID tagging element touches any of the borderlines, at least one of the RFID reading devices reads the RFID tagging element and sends a signal to the control center for determining whether the ball is out of bound or not. When the RFID reading devices are arranged at goal areas, the system may be used to determine the scoring. A decision signal is sent from the control center to a referee for use as a reference in making a decision.

Abstract: A ball feeder for ball serving machine includes a seat consisting of a hollow transfer frame and a shaft bear, a rotating unit mounted to one side of the seat and having a ball scoop extended from an end thereof, and a plurality of guide sections sequentially rotatably connected at an end to the shaft bearing. The guide sections may be turned about the shaft bearing in the same direction to form a nonlinearly inclined spiral ball guide path. A ball put in the top guide section automatically rolls down along the ball guide path and falls into the transfer frame to be caught by the ball scoop. When the ball scoop is turned by the rotating unit to face downward, the ball on the ball scoop falls into a feeding mouth on a body of the ball serving machine and is automatically served.