The present invention relates to a hollowed ball with an erratic movement for pets formed by a single piece, preferably made from an elastic material that allows the erratic movement during a rotation or rebound displacement due to its interior design. The form and dimensions and dimensions of the ball allows the storage of food in its interior, introducing and dosing such food through openings or hollows placed in the external part of the ball. The ball is structurally formed in its interior by at least two cylindrical sections with continuing radially arched thickness with a sequential projection of horizontally cylindrical truncated steps.

This ball for ball game includes: a spherical skin portion formed to be transparent at least partially so that inside of an internal space is visible from outside; a tubular retention portion provided in the internal space and extending so as to connect two poles of the skin portion, the tubular retention portion having a surrounded space therein; and a retained object retained in a visible state between the two poles in the surrounded space. The tubular retention portion has a shape helically twisted between the two poles. The tubular retention portion is twisted with an angle not less than 135? and not greater than 270? between the two poles.

This ball for ball game includes: a spherical skin portion formed to be transparent at least partially so that inside of an internal space is visible from outside; a tubular retention portion provided in the internal space and extending so as to connect two poles of the skin portion, the tubular retention portion having a surrounded space therein; and a retained object retained in a visible state between the two poles in the surrounded space. The tubular retention portion has a shape helically twisted between the two poles. The tubular retention portion is twisted with an angle not less than 135? and not greater than 270? between the two poles.

The Rollback Ball or Ballmerang is a ball toy consisting of a ball shell and a mechanical tracking device tracking the ball shell by using friction force or magnetic force converting the moving ball kinetic energy to potential energy, and then releasing the potential energy rolling the ball back at the same straight line path to the same launching destination when rolling the ball in any direction on a flat floor.

An apparatus for assisting and improving baseball hitting is described. The apparatus includes a spherical object having an interior anchor and a cord extending therefrom. An adjustable mass body is disposed within the spherical object along the cord. The interior anchor allows the spherical object to rotate about the cord.

A robot with an elastic, spherically-shaped body with controlled bouncing locomotion. This robot may be called a robotic bouncing ball. The robotic bouncing ball can be used to provide a new class of robotic characters that are ball-like, and these new robotic characters bounce in place and from one location to another. The spherical body will typically be formed with a thin wall of elastic material such as a rubber or the like, and a drive or actuator assembly along with a local controller and a power source are positioned in the interior space of the hollow body. The controller controls the drive assembly to cause the spherical body to bounce up and down vertically and to provide horizontal/lateral movement of the spherical body through the applications of deforming and/or reforming forces on the elastic outer wall.

A water-ball toy with a high playability comprises a central body made of sponge, and an outer shell continuously formed around the central body; the central body has a maximum outer perimeter width around the outer perimeter thereof; the outer shell comprises an inner wall surface and an outer wall surface, the inner wall surface defining an inner cavity having a minimum inner cavity diameter around the inner wall surface, the inner cavity diameter is not less than the outer perimeter width; the outer wall surface has at least a portion of a spherical surface, the outer wall surface further has a plurality of through holes formed therein, there is a wall thickness between the outer wall surface and the inner wall surface; the plurality of through holes extend through the wall thickness and define passages for water to enter and exit from the inner cavity through the through holes.

A water-ball toy with a high playability comprises a central body made of sponge, and an outer shell continuously formed around the central body; the central body has a maximum outer perimeter width around the outer perimeter thereof; the outer shell comprises an inner wall surface and an outer wall surface, the inner wall surface defining an inner cavity having a minimum inner cavity diameter around the inner wall surface, the inner cavity diameter is not less than the outer perimeter width; the outer wall surface has at least a portion of a spherical surface, the outer wall surface further has a plurality of through holes formed therein, there is a wall thickness between the outer wall surface and the inner wall surface; the plurality of through holes extend through the wall thickness and define passages for water to enter and exit from the inner cavity through the through holes.

Embodiments of the present invention provide a toy deformable to several structural configurations. The toy includes two endcaps connected by a plurality of pliable ribs. The toy may be deformed into a low-profile configuration by pressing the endcaps together, the ribs bending outward to accommodate the deformation. The toy may be deformed into a high-profile configuration by squeezing the ribs together, the endcaps being pushed apart to accommodate the deformation. While pressure is not applied to the toy, the toy may enter a non-deformed configuration wherein the ribs and the toy as a whole take on a substantially spherical form. A retention device may also be utilized to confine the toy to a specific configuration.

Embodiments of the present invention provide a toy deformable to several structural configurations. The toy includes two endcaps connected by a plurality of pliable ribs. The toy may be deformed into a low-profile configuration by pressing the endcaps together, the ribs bending outward to accommodate the deformation. The toy may be deformed into a high-profile configuration by squeezing the ribs together, the endcaps being pushed apart to accommodate the deformation. While pressure is not applied to the toy, the toy may enter a non-deformed configuration wherein the ribs and the toy as a whole take on a substantially spherical form. A retention device may also be utilized to confine the toy to a specific configuration.