U.S. patent application number 11/541567 was filed with the patent office on 2008-03-13 for method of adjusting coefficient of restitution of face of golf club head.
Invention is credited to Archer C. C. Chen.
Application Number | 20080064523 11/541567 |
Document ID | / |
Family ID | 39170424 |
Filed Date | 2008-03-13 |
United States Patent
Application |
20080064523 |
Kind Code |
A1 |
Chen; Archer C. C. |
March 13, 2008 |
Method of adjusting coefficient of restitution of face of golf club
head
Abstract
The present invention provides a method of adjusting a
coefficient of restitution (COR) of the face of a golf club head. A
metallic assistant device is fixed on a center of a back of the
face by friction welding or brazing. The metallic assistant may
increases the central thickness of the face that may reduce the COR
of the face.
Inventors: |
Chen; Archer C. C.;
(Taichung, TW) |
Correspondence
Address: |
BROWDY AND NEIMARK, P.L.L.C.;624 NINTH STREET, NW
SUITE 300
WASHINGTON
DC
20001-5303
US
|
Family ID: |
39170424 |
Appl. No.: |
11/541567 |
Filed: |
October 3, 2006 |
Current U.S.
Class: |
473/329 ;
473/345 |
Current CPC
Class: |
A63B 53/0458 20200801;
A63B 53/0433 20200801; A63B 2209/00 20130101; A63B 53/045 20200801;
A63B 53/0454 20200801; A63B 53/0466 20130101; A63B 53/06 20130101;
A63B 53/0437 20200801 |
Class at
Publication: |
473/329 ;
473/345 |
International
Class: |
A63B 53/00 20060101
A63B053/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 8, 2006 |
TW |
95133351 |
Claims
1. A method of adjusting a coefficient of restitution of the face
of a golf club head comprising the step of fixing an assistant
device, which is made of metal, on a back of the face to reduce the
coefficient of restitution of the face.
2. The method as defined in claim 1, wherein the assistant device
is fixed on the face by friction welding.
3. The method as defined in claim 2, further comprising the step of
performing brazing to fix the assistant device and the face after
the friction welding.
4. The method as defined in claim 1, wherein the assistant device
is fixed on the face by brazing.
5. The method as defined in claim 4, further comprising the step of
performing spot welding to pre-fix the assistant device and the
face prior to the brazing.
6. The method as defined in claim 1, wherein the assistant device
and the face are made of the same material.
7. The method as defined in claim 1, wherein the assistant device
and the face are made of different materials.
8. The method as defined in claim 1, wherein the assistant device
is a substantially round member.
9. The method as defined in claim 1, wherein the assistant device
is a substantially annular member.
10. The method as defined in claim 1, wherein the assistant device
has a recess.
11. A method of adjusting a coefficient of restitution of the face
of a golf club head comprising the step of fixing an assistant
device, which is made of metal, on a back of the face by friction
welding, wherein the assistant device and the face are made of the
same material.
12. The method as defined in claim 11, wherein the assistant device
is a substantially round member.
13. The method as defined in claim 11, wherein the assistant device
has a through hole.
14. The method as defined in claim 11, wherein the assistant device
has a recess.
15. A method of adjusting a coefficient of restitution of the face
of a golf club head comprising the step of fixing an assistant
device, which is made of metal, on a back of the face by brazing,
wherein the assistant device and the face are made of different
materials.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates generally to a method of
making golf club, and more particularly to a method of making a
golf club head that may adjust the coefficient of restitution of
the face.
[0003] 2. Description of the Related Art
[0004] In the standards of United States Golf Association (USGA),
the coefficient of restitution (COR) of the face must be less than
0.83. The golf club with COR greater than 0.83 is forbidden in the
game. The facts of COR of the face include the thickness of the
face and the hardness of the face. The thicker or harder face will
have less COR. In present days, the new material had introduced in
golf clubs that the thinner face can pass the strength test.
However, the thinner face usually has the COR greater than 0.83. A
solution is making the face thicker. The thicker face increases the
cost and shifts the center of gravity of the head forward that is
disadvantageous for swing. Now, a new head has a face made by
forging. Such face is thicker at center and thinner at margin that
may reduce the COR. The forging process is working under a high
temperature environment and molded in several molds that the cost
of manufacturing such faces is much higher and can not meet the
requirement of quick and mass production and making the products
with less quantity and more aspects.
SUMMARY OF THE INVENTION
[0005] The primary objective of the present invention is to provide
a method of adjusting the coefficient of restitution of the face,
which has lower cost of manufacture and fit to various types of
golf clubs.
[0006] The secondary objective of the present invention is to
provide a method of adjusting the coefficient of restitution of the
face, which provides various materials with different characters to
help the face getting perfect COR.
[0007] According to the objectives of the present invention, a
method of adjusting a coefficient of restitution of the face of a
golf club head including the step of fixing a metallic assistant
device on a back of the face to reduce the coefficient of
restitution of the face.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a sectional view of a first preferred embodiment
of the present invention;
[0009] FIG. 2 is a sectional view of a second preferred embodiment
of the present invention; and
[0010] FIG. 3 is a sectional view of a third preferred embodiment
of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0011] As shown in FIG. 1, a face 10 of a golf club head may be
made of metal and made by casting, forging or punching. In the
present invention, the face 10 is made of titanium alloy, more
preferred .beta.Ti TVC, with a thickness about 2.5 mm and a
hardness of HRC42.degree.. An assistant device 20 is made of
.beta.Ti 15-333 with a thickness about 1.5 mm and a hardness of
HRC28.degree.. The assistant device 20 is pressed on a center of a
back side of the face 10 and spun in a high speed. The spinning of
the assistant device 20 generates heat, and the heat welds the
assistant device 20 and the face 10 together, so called friction
welding, to form a face thicker at center and thinner at margin.
The thickness of the center of the face is about 4 mm that may
reduce the ROC.
[0012] As shown in FIG. 2, the second preferred embodiment provides
a face 30 made of 6-4 titanium and an annular assistant device 40,
which is made of 6-4 titanium also, fixed at a center of a back of
the face 30 by friction welding. It has gaps between the assistant
device 40 and the face 30 because of the friction welding, so that
we perform brazing to the junction between the face 30 and the
assistant device 40 to have solder 50 filled in the gaps that
enhance the strength of the connection of the face 30 and the
assistant device 40.
[0013] As shown in FIG. 3, the third preferred embodiment provides
a face 60 made of stainless steel and an assistant device 70 made
of titanium alloy. The assistant device 70 has a recess at the side
fixed to the face 60. Brazing is performed to fix the assistant
device 70 on a center of a back of the face 60.
[0014] The assistant device is preferred a round member when it
performs friction welding to fix the assistant device on the face.
The assistant device may be an elliptical, polygonal or irregular
or other shaped member that may perform friction welding.
[0015] The shape of the assistant device has no limitation when it
performs brazing to fix the assistant device on the face, except
for X shape or other shapes that can't perform brazing. The
condition may not suitable for friction welding, such as when the
assistant device and the face are made of different material, may
perform brazing to fix the assistant device and the face. Before
brazing it may perform spot welding or TIG to pre-fix the assistant
device on the face.
[0016] Table 1 shows the test report of the face of the first
preferred embodiment. The thickness of the face is measured at four
points, shown in the figure as A, B, C, D. First line is the
thicknesses of the blank of the face at the four points, and second
line is the thicknesses of the face after first grind. The face
after the second, third and fourth grinds is thinner at the fourth
points and has a greater COR. The CORs of the faces with the
assistant devices of the present invention are less than 0.83, and
the CORs of the faces without the assistant devices of the present
invention are greater than 0.83. It proves the assistant device of
the present invention helps the reduction of COR of the face.
[0017] The advantages of the present include fast adjustment of the
COR of the face and flexible to every golf club heads made by
different manufacture. It provides an easier and low-cost way to
adjust the COR of the face. The present invention has no need to
change the mold. The present invention may choose the specific
material for the assistant devices to adjust the COR.
[0018] The description above is a few preferred embodiments of the
present invention and the equivalence of the present invention is
still in the scope of the claim of the present invention.
* * * * *