US20070026961A1

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Publication number: US20070026961A1
Application number: US11/193,468
Authority: US
Inventors: Wen-Ching Hou
Original assignee: Nelson Precision Casting Co Ltd
Current assignee: Nelson Precision Casting Co Ltd
Priority date: 2005-08-01
Filing date: 2005-08-01
Publication date: 2007-02-01

Abstract

A golf club head includes a face portion disposed on a front face of a golf club head for hitting a golf ball and a sole portion formed on a lower portion of the golf club head. The sole portion includes a recessed deformation portion. The deformation portion includes a deformation-starting section, a deformation-ending section, and a maximum deformation section between the deformation-starting section and the deformation-ending section. A thickness of the deformation-starting section and a thickness of the deformation-ending section decrease toward the maximum deformation section so that the maximum deformation section has the smallest thickness allowing elastic deformation, thereby increasing elastic deforming capability of the sole portion.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a golf club head. In particular, the present invention relates to a golf club head with an improved sole portion.

2. Description of Related Art

U.S. Pat. No. 6,887,165 discloses a golf club including a face portion, a sole portion, and a crown portion. The face portion is disposed on a front face of a metallic golf club head and has a hitting surface for hitting a golf ball. The sole portion and the crown portion respectively form a lower portion and an upper portion of the metallic golf club head. A deformation portion is disposed on the sole portion and capable of elastic deformation when a golf ball is struck. The deformation portion comprises a protruding part which protrudes such that the sole portion is formed in an obtuse angle, in continuation with the hitting surface and the face portion in order to enhance an elastic effect. The protruding part has a first corner in the obtuse angle linking the face portion and the sole portion. The protruding part further has a second corner in the sole portion.

Although the above-mentioned golf club head may enhance the elastic deforming effect of the sole portion and thus the hitting performance by providing a deformation portion without greatly altering the shape of the head, further improvement is not provided in the basic structure of the deformation portion. For example, the deformation portion is generally of a uniform thickness. The elastic effect is enhanced when the thickness of the deformation portion is small, yet the structural strength of the sole portion is adversely affected. On the other hand, the structural strength of the sole portion is enhanced when the deformation portion is thicker, yet the elastic effect is sacrificed. In brief, an optimal elastic effect and maximum carry could not be reached if the deformation portion is merely a result of a change in a shape and angle in the sole portion.

OBJECTS OF THE INVENTION

An object of the present invention is to provide a golf club head including a deformation portion in a sole portion, wherein maximum deformation occurs in the thinnest portion of the deformation portion, thereby enhancing the elastic effect and the hitting performance.

Another object of the present invention is to provide a golf club head including a sole portion with a deformation portion near the face portion for shifting the center of gravity of the overall golf club head rearward, allowing more flexible adjustment of the center of gravity of the golf club head.

A further object of the present invention is to provide a golf club head including a sole portion with a deformation portion, wherein the deformation portion has a plurality of recesses in a surface thereof to enhance the elastic effect and the hitting performance.

Still another object of the present invention is to provide a golf club head including a sole portion with a deformation portion that has a plurality of protrusions on a surface thereof to improve the structural strength, thereby enhancing the structural strength of the sole portion and prolonging the life of the golf club head.

SUMMARY OF THE INVENTION

A golf club head in accordance with the present invention comprises a face portion disposed on a front face of a golf club head for hitting a golf ball and a sole portion formed on a lower portion of the golf club head. The sole portion comprises a recessed deformation portion. The deformation portion comprises a deformation-starting section, a deformation-ending section, and a maximum deformation section between the deformation-starting section and the deformation-ending section. A thickness of the deformation-starting section and a thickness of the deformation-ending section decrease toward the maximum deformation section so that the maximum deformation section has the smallest thickness allowing elastic deformation, thereby increasing elastic deforming capability of the sole portion.

Preferably, the deformation portion extends from a toe portion of the golf club head to a heel portion of the golf club head.

Preferably, the deformation portion protrudes toward a blade of the golf club head.

Preferably, the deformation portion is near the face portion.

Preferably, the deformation portion is an elongated groove.

In a modified embodiment of the invention, the sole portion comprises a flat inner face and a flat outer face, and the deformation portion is formed on the flat outer face adjacent to the face portion.

In another embodiment of the invention, the deformation portion comprises a plurality of recesses in an outer face thereof for increasing elastic deforming capability of the deformation portion.

In a further embodiment of the invention, the deformation portion comprises a plurality of protrusions on an outer face thereof for enhancing structural strength of the deformation portion.

The golf club head may be a head of an iron club, a wood club, or a utility golf club.

Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first embodiment of a golf club head in accordance with the present invention;

FIG. 2 is a sectional view of the first embodiment of the golf club head in accordance with the present invention;

FIG. 3 is an enlarged view of a portion of the golf club head inFIG. 2;

FIG. 4 is a sectional view similar toFIG. 2, illustrating deformation of the golf club head when hitting a golf ball;

FIG. 5 is a sectional view of a second embodiment of the golf club head in accordance with the present invention;

FIG. 6 is a sectional view of a third embodiment of the golf club head in accordance with the present invention;

FIG. 7 is a sectional view similar toFIG. 3, illustrating a fourth embodiment of the golf club head in accordance with the present invention; and

FIG. 8 is a sectional view similar toFIG. 3, illustrating a fifth embodiment of the golf club head in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring toFIGS. 1 through 3, a first embodiment of agolf club head10 in accordance with the present invention comprises aface portion11, asole portion12, a toe portion “a” and a heel portion “b”. In the illustrated embodiment, the golf club head is an iron club head made by casting, forging, or mechanical processing. Theface portion11 is disposed on a front face of the golf club head for hitting a golf ball. Thesole portion12 forms a lower portion of the golf club head.

Thesole portion12 comprises adeformation portion13. In the illustrated embodiment, thedeformation portion13 is formed on an outer face of thesole portion12 near theface portion11, with an inner face of thesole portion12 protruding upward toward a blade (not labeled) of thegolf club head10. Thedeformation portion13 extends from the toe portion “a” to the heel portion “b” of thegolf club head10, providing a structure with enhanced elastic effect.

Thedeformation portion13 comprises a deformation-startingsection131, a deformation-endingsection132, and amaximum deformation section133 between the deformation-startingsection131 and the deformation-endingsection132. The deformation-startingsection131 is formed on a side of thedeformation portion13 near theface portion11. The deformation-endingsection132 is formed on the other side of thedeformation portion13 near a rear portion of thegolf club head10. Themaximum deformation section133 between the deformation-startingsection131 and the deformation-endingsection132 bends upward toward the blade of the golf club head.

As best shown inFIG. 3, the thickness of the deformation-starting section131 and the thickness of the deformation-endingsection132 decrease toward themaximum deformation section133 so that themaximum deformation section133 has the smallest thickness W, providing an elongated groove (not labeled). Thus, the elastic deforming capability of thesole portion12 of thegolf club head10 is increased without sacrificing the structural strength of thesole portion12. The hitting performance of thegolf club head10 is enhanced accordingly.

Referring toFIG. 4, when hitting agolf ball90 with thegolf club head10 in accordance with the present invention, at the moment thegolf ball90 comes in contact with theface portion11, a rearward momentum is applied to theface portion11. At this time, theface portion11 and the deformation-startingsection131 of thedeformation portion13 begin to progressively deform toward the deformation-endingsection132. Since themaximum deformation section133 has the smallest thickness, a relatively larger rearward deforming capability is provided for theface portion11 and the deformation-starting section131;

Then, the deformation-startingportion131 creates a restitution force toward theface portion11 by the restitution property of thesole portion12, which restitution force is transmitted to thegolf ball90, increasing the striking momentum of thegolf club head10 and thus the hitting effect (the flying distance of the golf ball90). A perimeter of thedeformation portion13 is well supported and the thickness of thedeformation portion13 varies without sacrificing the structural strength of thesole portion12.

FIG. 5 illustrates a second embodiment of the invention. In this embodiment, thegolf club head10 is a head of a wood club or utility golf club. Similarly, thesole portion12 comprises adeformation portion13 near theface portion11. Thedeformation portion13 extends from the toe portion (not labeled) through the heel portion (not labeled) of thegolf club head10.

Thedeformation portion13 comprises a deformation-starting section131, a deformation-endingsection132, and amaximum deformation section133 between the deformation-starting section131 and the deformation-endingsection132. The thickness of the deformation-starting section131 and the thickness of the deformation-endingsection132 decrease toward themaximum deformation section133 so that themaximum deformation section133 has the smallest thickness. Thus, the elastic deforming capability of thesole portion12 of thegolf club head10 is increased without sacrificing the structural strength of thesole portion12. The hitting performance of thegolf club head10 is enhanced accordingly.

FIG. 6 illustrates a third embodiment of the invention modified from the first embodiment. The difference between the third embodiment and the first embedment is that thesole portion12 of thegolf club head10 of the third embodiment has greater thickness and a flat inner face and that thedeformation portion13 is substantially a groove in the outer face of thesole portion12 near theface portion11. Complex structure of thesole portion12 is avoided and thedeformation portion13 can be located as near to theface portion11 as possible. The elastic deforming capability of thesole portion12 of thegolf club head10 is increased without sacrificing the structural strength of thesole portion12. The hitting performance of thegolf club head10 is enhanced accordingly. Further, thedeformation portion13 shifts the center of gravity of thegolf club head10 rearward, thereby allowing more flexible adjustment of the center of gravity of the golf club head.

FIG. 7 illustrates a fourth embodiment of the invention modified from the first embodiment, wherein a plurality ofrecesses134 are defined in the outer face of thesole portion12. Preferably, therecesses134 are located adjacent to themaximum deformation section133. Therecesses134 may be in the form of dimples or annular grooves. Therecesses134 may be arranged regularly or irregularly and have identical or different sizes. Therecesses134 further increase the elastic deforming capability of thedeformation portion13.

FIG. 8 illustrates a fifth embodiment of the invention modified from the first embodiment, wherein a plurality ofprotrusions135 are formed on the outer face of thesole portion12. Preferably, theprotrusions135 are located adjacent to themaximum deformation section133. Theprotrusions135 may be in the form of separate spots or annular ribs. Theprotrusions135 may be arranged regularly or irregularly and have identical or different sizes. Theprotrusions135 further enhance the structural strength of thedeformation portion13, thereby prolong the life of thegolf club head10.

While the principles of this invention have been disclosed in connection with specific embodiments, it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention, and that any modification and variation without departing the spirit of the invention is intended to be covered by the scope of this invention defined only by the appended claims.

Claims

1. A golf club head comprising:

a face portion disposed on a front face of a golf club head for hitting a golf ball; and

a sole portion formed on a lower portion of the golf club head, the sole portion comprising a recessed deformation portion, the deformation portion comprising a deformation-starting section, a deformation-ending section, and a maximum deformation section between the deformation-starting section and the deformation-ending section, a thickness of the deformation-starting section and a thickness of the deformation-ending section decreasing toward the maximum deformation section so that the maximum deformation section has the smallest thickness allowing elastic deformation, thereby increasing elastic deforming capability of the sole portion.

2. The golf club head as claimed inclaim 1, wherein the deformation portion extends from a toe portion of the golf club head to a heel portion of the golf club head.

3. The golf club head as claimed inclaim 1, wherein the deformation portion protrudes toward a blade of the golf club head.

4. The golf club head as claimed inclaim 1, wherein the deformation portion is near the face portion.

5. The golf club head as claimed inclaim 1, wherein the deformation portion is an elongated groove.

6. The golf club head as claimed inclaim 1, wherein the sole portion comprises a flat inner face and a flat outer face, and wherein the deformation portion is formed on the flat outer face adjacent to the face portion.

7. The golf club head as claimed inclaim 1, wherein the deformation portion comprises a plurality of recesses in an outer face thereof for increasing elastic deforming capability of the deformation portion.

8. The golf club head as claimed inclaim 1, wherein the deformation portion comprises a plurality of protrusions on an outer face thereof for enhancing structural strength of the deformation portion.

9. The golf club head as claimed inclaim 1, wherein the golf club head is a head of one of an iron club, a wood club, and a utility golf club.