A first down indicator assembly includes cart that is rollable along a sideline of an American football field. A pair of laser units is each of the laser units is coupled to the cart. Each of the laser units emits a location beam outwardly onto the American football field. The laser units are spaced 10.0 yards apart from each other thereby facilitating officials to determine when a first down is achieved by a football team. An American football visibly renders the location beam from a respective one of the laser units when a football team achieves the first down. A display unit is coupled to the cart thereby facilitating the display unit to be visible to players on the American football field. The display unit displays a variety of indicia for indicating information relating the American football.

Provided are a golf ball which has a surface that sparkles when exposed to ultraviolet rays even if a naturally derived substance is used as a fluorescent material, and it is environmentally and human friendly, and a resin composition for a cover or a topcoat therefor. A resin composition for a cover or a topcoat of a golf ball of the present invention includes: a resin for a cover or a topcoat; and a plant-derived or alga-derived extract which emits light using an absorbed light as an energy source, as a fluorescent material. In the golf ball of the present invention, the cover or the topcoat is formed by using such a resin composition.

An inflatable sports ball is provided. The sports ball includes an interior bladder and a cover disposed about the interior bladder. The cover may include an outer substrate and an intermediate structure. The cover may further include an outer substrate surface, defined by the outer substrate, and a feature surface radially spaced apart from the outer substrate surface. Together the outer substrate surface and the feature surface cooperate to define an exterior surface of the cover. A mechanoluminescent material may be embedded in a portion of the cover. The mechanoluminescent material may be disposed at only one of the outer substrate surface and the feature surface, such that it is positioned to form a predetermined design on the cover. The mechanoluminescent material emits visible light in response to an externally-applied stress, such that the predetermined design illuminates when an external stress or mechanical stimulus is exerted upon the cover.

An inflatable sports ball is provided. The sports ball includes an interior bladder and a cover disposed about the interior bladder. The cover may include an outer substrate and an intermediate structure. The cover may further include an outer substrate surface, defined by the outer substrate, and a feature surface radially spaced apart from the outer substrate surface. Together the outer substrate surface and the feature surface cooperate to define an exterior surface of the cover. A mechanoluminescent material may be embedded in a portion of the cover. The mechanoluminescent material may be disposed at only one of the outer substrate surface and the feature surface, such that it is positioned to form a predetermined design on the cover. The mechanoluminescent material emits visible light in response to an externally-applied stress, such that the predetermined design illuminates when an external stress or mechanical stimulus is exerted upon the cover.

A sports ball is configured to enhance detection of spin properties by radar. The ball includes a spherical body having a first reflectivity with respect to radiation generated by a radar to be used in detecting spin of the ball. In addition, the ball includes a plurality of markers. Each of the markers has a second reflectivity with respect to the radiation generated by a radar to be used in detecting spin of the ball. The second reflectivity is different from the first reflectivity. The markers are distributed on the ball so that every great circle extending around an exterior surface of the ball is within a distance d of a projection on the exterior surface of the ball of at least one of the markers. The distance d is less than a radius of the ball.

A sports ball is configured to enhance detection of spin properties by radar. The ball includes a spherical body having a first reflectivity with respect to radiation generated by a radar to be used in detecting spin of the ball. In addition, the ball includes a plurality of markers. Each of the markers has a second reflectivity with respect to the radiation generated by a radar to be used in detecting spin of the ball. The second reflectivity is different from the first reflectivity. The markers are distributed on the ball so that every great circle extending around an exterior surface of the ball is within a distance d of a projection on the exterior surface of the ball of at least one of the markers. The distance d is less than a radius of the ball.

A device and method of illuminating a sports projectile device in motion along a trajectory. The method, performed in a processor device, comprises identifying a transition of the sports projectile device from an inactivated state to an activated state, detecting the motion along the trajectory in accordance with the activated state and illuminating the sports projectile device in accordance with a first periodicity of illumination rendered at a first position along the trajectory.

The present disclosure provides a luminous ball and relates to the technical field of ball products. The luminous ball includes a bladder and an outer cover. The bladder is provided with a plurality of first fixing blocks therein. A side of each of the plurality of first fixing blocks is hinged with a telescopic device. Output ends of the telescopic devices are hinged with a gravity ball. The gravity ball is provided with a first rectangular slot therein. According to the present disclosure, one side of the first fixing block is hinged with a telescopic device, such that during the movement of the ball, the gravity ball can expand and retract, and the movement of the gravity ball is facilitated. Through the hinging the telescopic device with the first fixing block and the gravity ball, the movement of the gravity ball in any direction inside the bladder is facilitated. A stopper between a first rectangular slot and a retaining block can buffer a first circular opening to a certain extent during the movement of the gravity ball. The structure of this product greatly improves the water resistance, and the battery can be replaced.

The present disclosure provides a luminous ball and relates to the technical field of ball products. The luminous ball includes a bladder and an outer cover. The bladder is provided with a plurality of first fixing blocks therein. A side of each of the plurality of first fixing blocks is hinged with a telescopic device. Output ends of the telescopic devices are hinged with a gravity ball. The gravity ball is provided with a first rectangular slot therein. According to the present disclosure, one side of the first fixing block is hinged with a telescopic device, such that during the movement of the ball, the gravity ball can expand and retract, and the movement of the gravity ball is facilitated. Through the hinging the telescopic device with the first fixing block and the gravity ball, the movement of the gravity ball in any direction inside the bladder is facilitated. A stopper between a first rectangular slot and a retaining block can buffer a first circular opening to a certain extent during the movement of the gravity ball. The structure of this product greatly improves the water resistance, and the battery can be replaced.

A system and method for playing a pin based game with an impact resistant ball and process of forming an impact resistant ball are provided. The impact resistant ball has an increased resistance to damage caused to a ball by repeated impact with objects such as a game board and game pins thereby decreasing the frequency with which the ball must be replaced. The impact resistant ball also has utility to afford a larger segment of the population the ability to properly grip and throw the impact resistant ball by providing an increased length gripper able to accommodate a greater range of hand sizes. The impact resistant ball has further utility to automatically identify and transmit data including the impact of the ball with the game pins and ball metrics including speed, pressure and weight.