A hollow rubber play ball is disclosed that uses a combination two or more fillers to produce desirable playing properties in a tennis ball as specified by the International Lawn Tennis Federation (ITF). The preferred play ball is a pressureless tennis ball. The specific fillers disclosed are mineral type particulate reinforcing fillers such as silicas and carbon black, polymeric fillers such as cellulose, a reaction product of grafting polyethylene with cellulose, and ethylene-vinyl acetate copolymers. These fillers can also have surface treatments to enhance the elastomer-filler interaction. Another reinforcing filler that can be introduced with the rubber components is the non-rubber constituents in skim rubber that serve to increase the modulus of a compounded rubber.

A hollow moulded article such as a ball of the kind used in play areas where children jump on and swim through a volume of the balls. During moulding, date coding is impressed on the ball is in a way which enables the older balls to be identified and replaced when necessary. The date coding is provided in two ways, one is to provide an adjustable pin within a part of the mould cavity, and the other is to provide indicia whose positions can be changed by rotation of the air venting plug within the mould.

A rubber composition suitable for producing hollow cores of pressureless tennis balls and superior in rebound properties and feeling of striking balls by racket, which contains, as a rubber component, 30 to 100 % by weight of a polybutadiene rubber having a content of cis-1,4 bond of at least 97 % by weight and a Z-average molecular weight of 5 x 10⁶ to 2 x 10⁷ and 70 to 0 % by weight of other diene rubbers.

Hollow tennis balls (A) comprise a hollow spherical core (3) of rubber composition and felt (1) covering the hollow spherical core (3), wherein physical properties of the spherical core (3) such as forward deformation, return deformation and rebound are differed corresponding to the skill, physical constitution, physical strength and athletic ability of players.

A tennis ball comprises a hollow elastic circumferential core defining a primary outer surface pattern, and a textile outer layer extending over and about the core.

The present invention relates to sports balls. A sports ball comprises a surface layer (45) comprising a plurality of panels (46). The sports ball further comprises a lattice structure (100; 20; 300; 40; 50; 60; 70; 1100) extending below the surface layer (45), wherein the lattice structure (100; 200; 300; 40; 50, 60; 70; 1100) comprises a plurality of lattice cells comprising radially extending elements (130; 230; 330; 630; 730; 1130). The lattice cells which are adjacent to the surface layer (45) have at least one dimension which is smaller than an average diameter of the panels (46).

The present invention is related to the field of toys and/or promotional articles and/or ornamental articles. More specifically it refers to a promotional toy formed by segments of a ball and connecting elements which form a functional ball. The advantage of this invention over the state of the art resides in the fact that the present invention allows for assembling a complete ball using only the bare hands, once all of the necessary segments are collected. It can be used for publicity of consumer products and has connecting means to achieve the first objective and allow it to be used as a ball to be kicked. The segment of a ball and the connecting elements which form a functional ball are characterized by consisting of a connecting system made up of a connecting element affixed to the segment of the ball and an accessory connecting element; the fixed connecting element consisting of a projection tangential cut on the edge of the segment of the ball and on the edge another longer projection parallel to the edge, a space being left between the peripheral edge of the segment and the inside face of the parallel projection.