Abstract A tennis ball having a cover and a multiplicity of electrically conductive fibers which are incorporated with the cover and which have portions extending on the outer surface of the cover to effectively render the ball's outer surface electrically conductive, whereby said ball is capable of completing an electrical circuit across spaced apart electrical conductors lying in a selected area on a tennis court for the purpose of detecting or sensing touchdown of the ball in said area. The electrically conductive fibers may be needle punched through the cover and they may be formed by coating synthetic fibers with an electrically conductive material such as a tin-containing oxide, or silver-plated nylon fibers may be used. An electrically conductive scrim or open mesh of fibers may be located along the inner surface of the cover to provide needed conductivity. A sulphur-free adhesive may be used to secure the cover to the ball.
A tennis ball for use with an electrical detection circuit in which touchdown of the ball in a selected area is detected by completion of a circuit between spaced apart electrical conductors lying in said area, said tennis ball comprising an elastically deformable sphere, a cover covering said sphere, a multiplicity of electrically conductive fibers incorporated into said cover and having portions on the inner and outer sides of said cover, and electrically conductive means formed separately of said fibers and said cover and lying entirely and solely between said cover and said sphere without passing through said cover and without being incorporated into said cover, said electrically conductive means being in contact with and electrically interconnecting the portions of said fibers on the inner side of said cover, said electrically conductive means cooperating with said fibers to provide an electrically conductive network extending along the inner side of said cover and passing through said cover to extend along the outer side of said cover for completing a circuit across a pair of said conductors upon touchdown of the tennis ball on said conductors.
Claim 2
Dependent Claim
184 words
A tennis ball for use with an electrical detection circuit in which touchdown of the ball in a selected area is detected by completion of a circuit between spaced apart electrical conductors lying in said area, said tennis ball comprising an elastically deformable sphere, a cover covering said sphere, a multiplicity of electrically conductive fibers incorporated into said cover and having portions on the inner and outer sides of said cover, and electrically conductive means formed separately of said fibers and said cover and lying entirely and solely between said cover and said sphere without passing through said cover and without being incorporated into said cover, said electrically conductive means being in contact with and electrically interconnecting the portions of said fibers on the inner side of said cover, said electrically conductive means cooperating with said fibers to provide an electrically conductive network extending along the inner side of said cover and passing through said cover to extend along the outer side of said cover for completing a circuit across a pair of said conductors upon touchdown of the tennis ball on said conductors.