초록 ▼

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,

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-sec2 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.

대표청구항 ▼

A bowling ball comprising: (a) an inner core having its center substantially coincident with the geometrical center of said bowling ball; (b) a solid outer core surrounding said inner core; (c) and a rigid elastomer foam cover surrounding said outer core, and having a minimum Shore D Durometer hardn

A bowling ball comprising: (a) an inner core having its center substantially coincident with the geometrical center of said bowling ball; (b) a solid outer core surrounding said inner core; (c) and a rigid elastomer foam cover surrounding said outer core, and having a minimum Shore D Durometer hardness of 72 and a maximum specific gravity of 1.