Tennis ball

Details Tennis ball Tennis ball

1989-08-28

1990-08-07

Marlo, George J.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273 29A, 273DIG020, A63B 3900, A63B 6938

Patent

active

049474669

ABSTRACT:
A hollow tennis ball which comprises a hollow core of elastic material which encloses an interior space, and a layer of substantially felt-like material which is applied to the outer surface of the hollow core. The overall weight of the hollow tennis ball is substantially between 30 and 54 grams. The pressure in the interior space is substantially from 0 to 0.7 kg/cm.sup.2 higher than atmospheric pressure. The thickness of the hollow core is substantially between 2.2 and 4.5 mm. The forward deformation of the hollow tennis ball is substantially from 6.5 to less than 12 mm under loading force of 3.5 and 18 pounds. The return deformation is substantially from 10.5 to less than 15 mm after it has deformed to 2.54 cm under a loading force of 18 pounds.

REFERENCES:
patent: 4249730 (1981-02-01), Frisk
patent: 4739989 (1988-04-01), Prinz et al.

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