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US 2017/0319908 A1Published application
Golf Balls Having Volumetric Equivalence On Opposing Hemispheres And Symmetric Flight Performance And Methods Of Making Same
AssigneeAcushnet Company
InventorsMichael R. Madson, Nicholas M. Nardacci
Life of this patent
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Abstract
Golf balls according to the present invention achieve flight symmetry and overall satisfactory flight performance due to a dimple surface volume ratio that is equivalent between opposing hemispheres despite the use of different dimple geometries, different dimple arrangements, and/or different dimple counts on the opposing hemispheres.
Claims20
A golf ball, comprising:
- a first hemisphere comprising a first plurality of dimples;
- and
- a second hemisphere comprising a second plurality of dimples, wherein
- each hemisphere is rotational symmetric about a polar axis;
- the first hemisphere has a first number of axes of symmetry about the polar axis;
- the second hemisphere has a second number of axes of symmetry about the polar axis;
- the first number of axes of symmetry is different from the second number of axes of symmetry;
- and
- the first plurality of dimples and the second plurality of dimples have substantially equivalent surface volumes.
6 more elements
A golf ball, comprising:
- a first hemisphere comprising a first plurality of dimples having a first average dimple surface volume;
- and
- a second hemisphere comprising a second plurality of dimples having a second average dimple surface volume, wherein
- the first hemisphere has a first number of axes of symmetry about the pole of the first hemisphere;
- the second hemisphere has a second number of axes of symmetry about the pole of the second hemisphere;
- the first number of axes of symmetry is the same as the second number of axes of symmetry;
- a portion of the first plurality of dimples has a rotational angle φN and a polar angle θN;
- a portion of the second plurality of dimples has a rotational angle φS and a polar angle θS;
- each respective rotational angle φN or polar angle θN differs from each respective rotational angle φS or polar angle θS by at least 3°;
- and
- the absolute difference between the first average dimple surface volume and the second average dimple surface volume is less than 3.5×10−6.
8 more elements
A golf ball having a spherical outer surface, comprising:
- a first hemisphere comprising a first number of dimples having a first average dimple surface volume;
- a second hemisphere comprising a second number of dimples having a second average dimple surface volume;
- wherein
- the first number of dimples differs from the second number of dimples by at least two;
- the absolute difference between the first average dimple surface volume and the second average dimple surface volume is less than 3.5×10−6;
- and
- the outer surface of the golf ball does not contain a great circle which is free of dimples.
4 more elements
Dependencies are inferred from the claim text.