Claims
- 1. A method of manufacturing a golf club head of predetermined shape and volume having a sole, a top face, a homogeneous front face for striking a golf ball and a rear face opposite said front face, said method creating cavities reducing the weight of said head to a predetermined extent without changing its shape and volume, said method comprising:
- providing a mold having front and rear portions corresponding to front and rear faces of said head,
- introducing at least two elements into the interior of said mold through apertures in said rear portion, each said element projecting into said mold a determined distance less than the distance between said rear and front faces,
- introducing a hardenable material into said mold and around said projecting elements to achieve a predetermined head shape,
- hardening said material to produce a molded head,
- withdrawing said projecting elements from said material to leave at least two said cavities of predetermined length in said head, and
- removing said molded head from the mold.
- 2. A method in accordance with claim 1 in which said elements are cylinders, the axes of said cylinders being parallel and included in planes perpendicular to a horizontal tangent to the center of said front face, said planes being oriented in the same direction as a player stroke, the partition or partitions between said cavities extending between said rear face and said front face of said head, and being oriented in the same direction as said stroke, whereby said front face is strengthened to reduce vibrations and to obtain a high level of restitution of energy and a good sound when a ball is struck by said head.
- 3. A method in accordance with claim 2 in which said axes are positioned between the heel and the toe of said head in a manner which fixes the center of gravity of said head at a desired point behind said front face of said head.
- 4. A method as claimed in claim 2 in which said cylinders are introduced into said mold by means of a block separated from said mold, to which the ends of said cylinders are attached, permitting said cylinders to be simultaneously inserted into or withdrawn from said mold.
- 5. A method in accordance with claim 2 in which the head is a driver head and in which said cavity axes are positioned in said planes in a manner which leaves a greater height of said material between the ends of said cavities behind said front face and the sole of said head than between said ends and the top face of said head.
- 6. A method in accordance with claim 5 in which said ends of said cavities end between 0.5 and 1 cm from said top face of said head and between 1 and 1.5 cm from said front face of said head with a separator of at least 0.4 cm between them.
- 7. A method in accordance with claim 5 in which, after molding, said cavities are partly filled with light damping foam.
- 8. A method in accordance with claim 7 in which the apertures of cavities in the rear face of said head are closed with self-bonding material having a density approximately the density of said hardenable material.
- 9. A method in accordance with claim 7 in which said driver cavities are closed by hardened cylinders of said hardenable material.
- 10. A method in accordance with claim 8 in which the weight of and golf club head is controlled in part by the proportion in said cavities between the length of said light damping foam and the length of said self-bonding material.
- 11. A method in accordance with claim 9 in which the weight of said golf club head is controlled in part by the proportion in said cavities between the length of said light foam and the length of said cylinders.
- 12. A method in accordance with claim 9 in which at least one of said hardened cylinders is a part of a molded piece bonded to said head and concealing the apertures of said cavities.
- 13. A method in accordance with claim 12 in which the material of said hardened cylinder and said piece has high damping properties.
- 14. A method in accordance with claim 1 in which said golf club head is a driver head and said hardenable material is a polyurethane polymer.
- 15. A method in accordance with claim 4 in which said golf club head is an iron or a putter head and said cavities are filled and closed by self-bonding material.
- 16. A method in accordance with claim 4 in which said golf club head is an iron or putter head, at least one cavity being filled by a cylinder which is part of a piece of polyurethane polymer bonded to said head and concealing the apertures of said cavities.
- 17. A method in accordance with claim 16 in which said cylinder and piece bonded to an iron head are extended and rounded, permitting such head to be used as a "wood" head, as well as an iron head, with proper weight, face characteristics and type of shaft.
- 18. A method in accordance with claim 16 in which said polyurethane polymer of said cylinder and piece has high damping properties.
Priority Claims (1)
Number |
Date |
Country |
Kind |
87 18147 |
Dec 1987 |
FRX |
|
Parent Case Info
This is a continuation-in-part of application Ser. No. 07/290,225, filed Dec. 22, 1988, now abandoned.
US Referenced Citations (4)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
290235 |
Dec 1988 |
|