Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1987-08-11
1989-02-07
Marlo, George J.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273DIG20, 273DIG8, A63B 3714
Patent
active
048026719
ABSTRACT:
A bowling ball having a substantially large portion of the ball's weight concentrated toward the center of the ball, to form a bowling ball having a low moment of inertia. The ball comprises a solid inner core made from a mineral oxide such as lead oxide mixed with a binding resin such as polyester, an outer core surrounding the inner core and made from filled or unfilled elastomers such as polyurethane or polyester, and a low density syntactic foam cover encapsulating the outer core and made from polyurethane or other elastomers mixed with glass microballoons, and having a minimum Shore D hardness of 72 and a maximum specific gravity of 1. The inner core in conjunction with the outer core and cover has a calculated maximum moment of inertia of 0.184 in-ozs-sec.sup.2 per pound of ball weight, for providing a substantially high total kinetic energy output. An additional increase in total kinetic energy output is obtained by the use of a high density annular top weight mass located closely around the inner core such that its lower surface is located at the midplane of the ball.
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