| 摘要 |
A two-piece bowling ball includes a non-symmetrical weight block or core to provide improved and increased rotation inertia. The block consists of head, body and tip portions. The block is asymmetric in plan, the asymmetry being the result of truncation of a plan-symmetric form of the block by a plane extending through the block at an angle of less than 90 degrees to the vertical, removing less than 50% of the plan-symmetric block mass. The untruncated form of the head is a spherical segment of one base having its spherical surface concentric with the surface of the ball. The non-truncated body is in the form of a cylinder or parallelepiped, while the tip in its untruncated form is of a shape having a maximum diameter no greater than that of the body whose diameter is no greater than that of the head. The tip is further chosen such that overall top eccentricity after truncation does not exceed three ounces in accordance with ABC guidelines.
|
