Golf club head having an inner subassembly and an outer casing a

Details Golf club head having an inner subassembly and an outer casing a Golf club head having an inner subassembly and an outer casing a

1994-09-30

1996-11-05

Passaniti, Sebastiano

Games using tangible projectile

Golf

Club or club support

473335, 473349, A63B 5304

Patent

active

055708862

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention is related to a new construction for a golf club head, especially a head of the "wood" type, as well as to the method of manufacturing such a head.
2. Discussion of Background and Material Information
The golf club used typically at the start of a hole is commonly known as the "driver". It generally has a hollow metallic head with a slight thickness and is constituted by the assembly of several metal elements welded to one another to define a closed inner cavity. Such constructions, described in U.S. Pat. No. 4,438,931, U.S. Pat. No. 5,024,437 and Japanese Patent Publication No. 61-33973, for example, result in clubs whose tolerance cannot be improved beyond a certain threshold due to the critical mass of the head and due to the isotropic character of the material. Indeed, generally it is not possible to add weights to the club head without increasing the mass limit beyond a point at which it is no longer possible to obtain the correct balance for the club and, furthermore, the distribution of mass is very closely linked to the shape of the head itself.
Another disadvantage of this type of head is related to the nature of the material that constitutes the impact surface, i.e., the ball-striking face, which, although enabling a direct transmission of information to the player, provides a disagreeable sensation and sound at impact.
Heads constructed entirely of a composite material, with the exception of the sole, have appeared over the last few years. These types of constructions are very rarely favored by professional golfers because, most often, they are constructed in a single piece by the compression molding method, without any particular regard to the distribution of mass.


SUMMARY OF THE INVENTION

It is the object of the present invention to provide a golf club head having a new construction that overcomes the aforementioned disadvantages, i.e., on the one hand, enabling improvement of the sensation perceived by the player at impact, while retaining direct transmission of information to the player, and, on the other hand, increasing the mass distribution and concentration possibilities so that the head becomes more tolerant by increasing its moments of inertia.
Another object of the invention is to improve the transmission of the energy of the mass, so divided and concentrated, directly towards the impact surface. The invention also has the advantage of being able to be implemented by various techniques and in a wide choice of materials.
To this end, the present invention is related to a golf club head that includes, on the one hand, an inner subassembly defining an inner space and, on the other hand, an outer covering and protective casing made of a plastic material at least partially covering the subassembly. The inner subassembly is constituted by the assembly of a rigid inner shell, hollow and open, made of a low-density material and an impact-resistant sealing element cooperating with the shell so as to close off the inner space, such element comprising an inner wall constituting the support for the striking surface of the head.
Furthermore, the inner shell comprises at least one housing provided in the area of its peripheral wall, within which is positioned an additional mass made of a high-density material and covered by the outer casing.
The shell includes, on the other hand, inner reinforcement walls or ribs so as to provide the shell with maximum rigidity in order that it may avoid deformation, and so as to improve the direct transmission of the energy from the additional mass towards the impact surface.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be more fully described and other characteristics and advantages of the invention will become apparent from the description that follows with reference to the annexed drawings that are provided only as non-limiting examples thereof.
FIG. 1 is a front elevational view of a "wood" type head, and especially a head of the invention;
FIG. 2 is a side elevational s

REFERENCES:
patent: 3211455 (1965-10-01), Hyden
patent: 4438931 (1984-03-01), Motomiya
patent: 4545580 (1985-10-01), Tomita
patent: 4602787 (1986-07-01), Sugioka et al.
patent: 4809978 (1989-03-01), Yamaguchi et al.
patent: 4811949 (1989-03-01), Kobayashi
patent: 4984800 (1991-01-01), Hamada
patent: 5000454 (1991-03-01), Soda
patent: 5024437 (1991-06-01), Anderson
patent: 5106094 (1992-04-01), Desbiolles et al.

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