G - Physics – 08 – B
Patent
G - Physics
08
B
340/124, 340/135
G08B 1/08 (2006.01)
Patent
CA 1244902
ABSTRACT OF THE DISCLOSURE An electrically conductive tennis ball comprising a cover of woven fabric in which the yarn used for weaving the fabric in at least one direction is made by twisting together a blend of electrically conductive and electrically nonconductive filament fibers. The electrically nonconductive fibers may predominate, and the woof yarn may be thicker than the warp yarn which may be so woven with the woof yarn that the latter occupies the major part of the ball's surface. To promote continuity of the electrical paths in the ball's cover, an electrically conductive adhesive, or mat, or scrim or other base may be interposed between the woven cover, and an electrically conductive coating may be applied to the inner, or back, side of the cover. Needling may also be employed to reorient the fibers in the cover and thereby enhance the conductivity of the electrical paths along the inner side of the cover. Features of the invention such as those just des- cribed reduce the number of electrically conductive fibers needed to make the ball operate satisfactorily, eliminating object- ionable discoloration of the ball attributable to those fibers and also eliminating changes in the playing characteristics of the ball which a greater number of those fibers might create. Tennis balls as just described may be made more conductive than water to keep water on the court from generating a false signal.
535493
Meredith & Finlayson
Van Auken John A.
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