Dual density polymer putter
AssigneeCallaway Golf Company
InventorsHerbert Reyes, Joel B. Erickson, Wayne H. Byrne
Life of this patent
Estimating the term…
Abstract
A golf club head (22) composed of an interior body (42) having a first density and an outer shell (40) having a second density is disclosed herein. The golf club head (22) is preferably a putter. A method (100) for forming the golf club head (22) is also disclosed herein. The interior body (42) is preferably composed of an injectable polyurethane material integrated with tungsten to have a density between 4.0 g/cc to 10 g/cc. The outer shell (40) is preferably composed of a thermoplastic material such as an ionomer blend to have a density less than 1.0 g/cc.
Claims18
A golf club head comprising:
- a solid inner body having a blade portion and a flange portion composed of a first injectable material having a first density, the first density greater than 4.0 g/cc;
- and
- an outer shell disposed over the solid inner body, the outer shell composed of a second injectable material having a second density, the second density less than the first density;
- and
- the outer shell having a Shore D hardness of between 40 to 60;
- wherein the weight of the club head is from 300 grams to 350 grams.
A putter head comprising:
- a solid interior body composed of a polyurethane material integrated with a high density metal, the interior body having a density of 4.0 g/cc to 10 g/cc and occupying a volume of at least 100 cc;
- an outer shell encompassing the interior body, the outer shell composed of a polymer material having a density less than 1.0 g/cc, the outer shell having a thickness of between 0.100 inch to 0.500 inch;
- and a Shore D hardness of between 40 to 60;
- wherein the weight of the club head is from 300 grams to 350 grams.
A method for forming a golf club head, the method comprising:
- injecting a first injectable material having a first density that is greater than 4.0 g/cc into a mold having a first mold half and a second mold half mated together to form an interior body;
- the interior body having a blade portion and a flange portion and having a shape substantially similar to the golf club head;
- capturing the interior body within a second mold;
- wherein the second mold has a first mold half and a second mold half and a plurality of gates located along the parting line of the first mold half and the second mold half;
- wherein each mold half has a recess to an interior cavity and a plurality of retractable pins which captures the interior body;
- injecting a second material into the second mold cavity via the plurality of gates to encompass the solid interior body and form an outer shell, the second material having a second density that is less than the first density, and the outer shell having a thickness of between 0.100 inch to 0.250 inch, a Shore D hardness of between 40 to 60;
- and wherein the weight of the club head is between 300 grams to 350 grams.
Dependencies are inferred from the claim text.