Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1980-06-30
1982-07-20
Marlo, George J.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 58K, 273DIG20, 2643281, A63B 4110, A63B 3908
Patent
active
043402224
ABSTRACT:
A tennis ball consisting of two identical hemispheres joined together and including small upstanding integral fingers molded into the outer surface of the ball to provide surface texture, and enable the ball to grip the surface of the racquet. Each hemisphere incorporates an integrally molded plug in the interior of the hemisphere for providing means for introducing pressure into the ball. One or both of the plugs are pierced by a needle during fabrication to provide a conduit for a needle valve inflating device. A cylindrical sphincter is placed around the inflation plug during manufacture to squeeze the plug and prevent the escape of air when the ball is inflated. The ball is manufactured by first injection molding the hemispheres and then placing the hemispheres in facing mold halves. The hemispheres are provided with a rim of material to enable the hemispheres to be held in the mold, and a hot plate is inserted between the halves, which are then advanced and pressed against the plate rendering the abutting surfaces soft and partially molten. The plate is then withdrawn and the mold halves pressed together to fuse the rims of the two hemispheres together. The ball is then removed from the mold and the excess rim material removed leaving a round, hollow inflatable ball of predetermined size and surface texture.
REFERENCES:
patent: 1596320 (1926-08-01), Sonnett
patent: 2035774 (1936-03-01), Trobridge et al.
patent: 2085369 (1937-06-01), Kilborn
patent: 2288889 (1942-07-01), Costello
patent: 2597704 (1952-05-01), Carlson
patent: 2710623 (1955-06-01), Kolos
patent: 2975823 (1961-03-01), Ponnock
patent: 3032345 (1962-05-01), Lemelson
patent: 3927881 (1975-12-01), Lemelson
Blaszcak, Jr. Peter P.
Kerkenbush Darle L.
Marlo George J.
Wham-O Mfg. Co.
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