Game ball made by method including molding and machining steps

Details Game ball made by method including molding and machining steps Game ball made by method including molding and machining steps

1991-06-14

1993-08-31

Marlo, George J.

Amusement devices: games

Surface projectile game; game element

Disk or ring games

51289S, 264239, 273DIG008, A63B 7104, A63B 3700

Patent

active

052402509

ABSTRACT:
A substantially improved table soccer/fussball game playing ball is fabricated by molding an oversized spherical blank entirely from a single thermoplastic material, preferably a urethane material having a hardness within the approximate range of from about 50 Shore D to about 60 Shore D. The oversized molded blank is then subjected to a precision surface machining process, preferably using a centerless grinding machine, to reduce its diameter to a desired finished magnitude and to provide the resulting finished playing ball with a very precisely spherical shape having a sphericity which does not vary by more than about 0.001 inch on any external surface portion thereof. Compared to conventionally fabricated table soccer playing balls, the machined, single thermoplastic material playing ball provides a variety of advantages including a truer playing roll, considerably more durability and resistance to surface wear, and the desirable ability to retain its "like new" playing characteristics for a much longer period of time.

REFERENCES:
patent: 1686124 (1928-10-01), Brower
patent: 2524546 (1950-10-01), Sinclaire
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patent: 4610071 (1986-09-01), Miller
patent: 4790534 (1988-12-01), Jamison
patent: 4861028 (1989-08-01), Williams
patent: 4872677 (1989-10-01), Dawson et al.
patent: 5058892 (1991-10-01), McCloud

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