U.S. patent application number 10/765216 was filed with the patent office on 2005-07-28 for golf club head having an alignment marker on its strike face.
Invention is credited to Bode, James A., Wood, David A..
Application Number | 20050164800 10/765216 |
Document ID | / |
Family ID | 34795432 |
Filed Date | 2005-07-28 |
United States Patent
Application |
20050164800 |
Kind Code |
A1 |
Wood, David A. ; et
al. |
July 28, 2005 |
Golf club head having an alignment marker on its strike face
Abstract
A golf club head having a hollow metal body with a metal strike
face. The metal strike face has a coating applied thereto of a
first hue of color that defines an alignment marker for a golfer.
The decorative coating covers at least 10% of an entire surface
area of the metal strike face, covers the geometric center of the
strike face, is bounded by at least a second hue of color that is
different than the first hue of color, and does not extend to a
periphery of the metal strike face The coating has physical
properties that do not affect a launch angle and spin rate of a
golf ball hit with the golf club head.
Inventors: |
Wood, David A.; (Humble,
TX) ; Bode, James A.; (Albany, GA) |
Correspondence
Address: |
COOLEY GODWARD LLP
ATTN: PATENT GROUP
11951 FREEDOM DRIVE, SUITE 1700
ONE FREEDOM SQUARE- RESTON TOWN CENTER
RESTON
VA
20190-5061
US
|
Family ID: |
34795432 |
Appl. No.: |
10/765216 |
Filed: |
January 28, 2004 |
Current U.S.
Class: |
473/219 ;
473/231; 473/238; 473/242; 473/324; 473/345 |
Current CPC
Class: |
A63B 69/3632 20130101;
A63B 53/0441 20200801; A63B 53/0416 20200801; A63B 53/0408
20200801; A63B 53/0466 20130101 |
Class at
Publication: |
473/219 ;
473/238; 473/242; 473/324; 473/345; 473/231 |
International
Class: |
A63B 069/36 |
Claims
1. A golf club head comprising: a hollow metal body having a metal
strike face with a periphery, said metal strike face having an a
coating applied thereto of a first hue of color to define an
alignment marker for a golfer, said coating: covering at least 10%
of an entire surface area of said metal strike face, covering a
geometric center of said strike face, being bounded by at least a
second hue of color that is different than said first hue of color,
not extending to said periphery of said metal strike face, and
having physical properties that do not affect a launch angle and
spin rate of a golf ball hit with the golf club head.
2. The golf club head of claim 1, said first hue of color being a
first shade of black, said second hue of color being a second shade
of black.
3. The golf club head of claim 1, said first hue of color being a
shade of black, said second hue of color being that of the metal of
the strike face.
4. The golf club head of claim 1, said coating being in the shape
of an ellipse.
5. The golf club head of claim 1, said coating being a plastic.
6. The golf club head of claim 5, said plastic being
polyvinylidenfluoride.
7. The golf club head of claim 1, said coating being sprayed on
said metal strike face.
8. The golf club head of claim 1, said coating covering at least
30% of said entire surface area of said metal strike face.
9. The golf club head of claim 1, an entirety of said metal strike
face having a substantially uniform surface finish.
10. A golf club head comprising: a hollow metal body having a metal
strike face with a periphery, said metal strike face having a
substantially uniform coefficient of friction, a substantially
uniform hardness, and a coating applied thereto of a first hue of
color to define an alignment marker for a golfer, said coating:
covering at least 10% of an entire surface area of said metal
strike face, covering a geometric center of said strike face, being
bounded by at least a second hue of color that is different than
said first hue of color, not extending to said periphery of said
metal strike face, and not changing said coefficient of friction
and said hardness of said metal strike face.
11. The golf club head of claim 10, said first hue of color being a
shade of black, said second hue of color being that of the metal of
said strike face.
12. The golf club head of claim 10, said coating being in the shape
of an ellipse.
13. The golf club head of claim 10, said coating being
polyvinylidenfluoride.
14. The golf club head of claim 10, said coating being sprayed on
said metal strike face.
15. The golf club head of claim 10, said coating covering at least
40% of said entire surface area of said metal strike face.
16. A method comprising: creating an alignment marker on a metal
strike face of a golf club head by creating a surface finish in the
metal strike face, applying a coating to the metal strike face, and
buffing the coating on the metal strike face.
17. The method of claim 16, further comprising: masking a portion
of the metal strike face prior to said applying the coating to the
metal strike face; and removing the mask after said applying the
coating to the metal strike face.
18. The method of claim 16, the surface finish being 180 grit
scratch.
19. The method of claim 16, the coating being a plastic, said
applying the coating to the metal strike face including: spraying
the plastic on the metal strike face.
20. The method of claim 19, the plastic being
polyvinylidenflouride.
21. The method of claim 19, the plastic being at a temperature over
300.degree. C. when sprayed on the metal strike face.
22. The method of claim 16, said buffing the coating on the metal
strike face resulting in the coating substantially only residing in
scratches of the surface finish of the metal strike face.
23. The method of claim 16, said buffing the coating on the metal
strike face resulting in the metal strike face having a
substantially uniform surface finish.
24. A method of fabricating a golf club head comprising: applying a
coating of a first hue of color to a metal strike face of a golf
club head such that: the coating covers at least 10% of an entire
surface area of the metal strike face; the coating covers a
geometric center of the metal strike face; the coating does not
extend to a periphery of said metal strike face, and the coating is
bounded by at least a second hue of color that is different than
said first hue of color.
25. A golf club head comprising: a hollow metal body with a metal
strike face, said metal strike face having a coating thereon that
defines an alignment mark on a geometric center of said metal
strike face, said alignment mark being configured to assist a
golfer in aligning a golf ball with said geometric center when
addressing the golf ball, said alignment mark having physical
properties that do not affect a launch angle and spin rate of a
golf ball hit with the golf club head.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to metal golf club heads and,
more particularly, to the strike face of metal golf club heads.
DESCRIPTION OF THE RELATED ART
[0002] The ideal location to strike a golf ball on a metal wood
head, such as driver, is typically at or very near the geometric
center of the strike face. This is often termed the "sweet spot" of
the strike face. Many golfers have difficulty striking golf balls
at the sweet spot, especially with oversized club heads. To assist
golfers in striking golf balls at the sweet spot of the strike
face, many club heads include score lines on the strike face that
roughly surround the sweet spot. Unfortunately, strike lines are
difficult to identify when addressing a golf ball.
SUMMARY
[0003] In light of the above-described problems of some
conventional golf club heads, some embodiments of the present
invention generally strive to provide a golf club head having an
alignment marker on its strike face. The alignment marker assists
golfers in aligning a golf ball with the geometric center of the
strike face when addressing the golf ball.
[0004] In accordance with one embodiment, the invention concerns a
golf club head having a hollow metal body with a metal strike face.
The metal strike face has a coating applied thereto of a first hue
of color that defines an alignment marker for a golfer. The
decorative coating covers at least 10% of an entire surface area of
the metal strike face, covers the geometric center of the strike
face, is bounded by at least a second hue of color that is
different than the first hue of color, and does not extend to a
periphery of the metal strike face The coating has physical
properties that do not affect a launch angle and spin rate of a
golf ball hit with the golf club head.
[0005] In accordance with another embodiment, the invention
concerns a method of creating an alignment marker on a metal strike
face of a golf club head by creating a surface finish in the metal
strike face, applying a coating to the metal strike face, and
buffing the coating on the metal strike face.
[0006] Other advantages and features associated with the
embodiments of the present invention will become more readily
apparent to those skilled in the art from the following detailed
description. As will be realized, the invention is capable of other
and different embodiments, and its several details are capable of
modification in various obvious aspects, all without departing from
the invention. Accordingly, the drawings in the description are to
be regarded as illustrative in nature, and not limitative.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is perspective view of a golf club head in accordance
with a first embodiment of the present invention.
[0008] FIG. 2 is a front view of the strike face of the golf club
head illustrated in FIG. 1.
[0009] FIG. 3 is flow diagram illustrating a method of fabricating
an alignment marker on the metal strike face of the golf club heads
illustrated in FIG. 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0010] FIG. 1 illustrates one embodiment of a golf club head 20 in
accordance with the present invention. The golf club head 20 is
attached to a golf shaft (not illustrated) to form an assembled
golf club (not illustrated). As illustrated in FIG. 1, the golf
club head 20 has a front strike face 22 that strikes a golf ball
when a golfer swings the club. The strike face 22 includes a
periphery defined by a top edge 24, a bottom edge 26, a toe edge
28, and a heel edge 30. The golf club head 20 also includes a
backside 32 located opposite from the front strike face 22 and that
defines the trailing edge of the club head 20 when a golfer swings
the club. The golf club head 20 also includes a heel 34, a toe 36
located opposite from the heel, and a hosel 38 that receives the
shaft of the golf club. The golf club head 20 further includes a
crown 40 that defines the top of the golf club head, and a sole
located opposite from the crown. The sole adjoins the bottom edge
26 of the strike face 22 and extends rearward in a direction toward
the backside 32 until it adjoins the backside, and also extends in
a direction toward the heel 34 and toe 36.
[0011] The golf club head 20 has a hollow body defined by a
metallic wall. The metallic wall defines the perimeter of the golf
club head 20, including the metal strike face 22. In this manner
the golf club head 20 is perimeter weighted. The metallic wall
includes an interior surface that faces an interior of the golf
club head 20. The metallic wall also includes an exterior surface
that faces an exterior of the golf club head 20. In the preferred
embodiment, the interior of the golf club head is empty, having no
material therein except for a gas, such as air. However, in
alternative embodiments of the golf club head 22, the interior may
be filled with a substance such as foam and/or may include
reinforcement bars or ridges therein, yet still be considered
"hollow."
[0012] As is illustrated in FIGS. 1 and 2, the metal strike face 22
includes an alignment marker or strike marker 40. The alignment
marker 40 assists golfers in aligning a golf ball with the
geometric center C of the strike face when addressing the golf ball
to help golfers avoid hitting off-center shots. However, the
alignment marker 40 does not affect the launch angle and spin rate
of a golf ball hit with the golf club head. The alignment marker 40
does not affect the launch angle and spin rate of a golf ball hit
with the golf club head because the alignment marker does not alter
or change the physical properties of the strike face 22 that affect
the launch angle and spin rate, such as the coefficient of friction
and hardness of the strike face. That is, the alignment marker 40
serves no other function than assisting the golfer in aligning a
golf ball with the geometric center C of the strike face when
addressing the golf ball before or during the golf swing. As is
illustrated in FIG. 2, the alignment marker 40 covers the geometric
center C of the strike face 22, i.e., the "sweet spot" of the
strike face, located along the ideal driving or strike line for the
club head.
[0013] The alignment marker 40 covers at least 10%, preferably at
least 20%, and more preferably at least 30% of the entire surface
area of the metal strike face--while still covering the geometric
center C of the strike face. In a particularly preferred
embodiment, the alignment marker 40 covers approximately 40% of the
entire surface area of the metal strike face, including the
geometric center C. Additionally, to assist a golfer in identifying
the alignment mark at address, the alignment marker 40 is
preferably a hue of color that is different than that of the area
42 that bounds the alignment marker, i.e., the remainder of the
strike face. The differing hues may be different colors, different
gradations of the same or different colors, or different shades and
tints of the same or different colors. In the preferred embodiment
of a driver, the alignment marker 40 is a dark grey color, i.e., a
shade of black, while the area 42 bounding the alignment marker is
that of the exposed metal of the strike face, namely that of buffed
Beta Titanium alloy 2041. In a preferred embodiment of a fairway
wood, the alignment marker 40 is a dark grey color, i.e., a shade
of black, while the area 42 bounding the alignment marker is that
of the exposed metal of the strike face, namely that of buffed 465
marajing steel. In an alternative embodiment, the alignment marker
40 is a dark grey color, i.e., a shade of black, while the area 42
bounding the alignment marker is a lighter grey color, i.e.,
another shade of black. In a further embodiment, the alignment
marker 40 is white, while the area 42 bounding the alignment marker
is a shade of black or pure black. In yet another embodiment, the
alignment marker 40 is red, while the area 42 bounding the
alignment marker is the hue of exposed metal.
[0014] To assist golfers in aligning a golf ball with the geometric
center of the strike face when addressing the golf ball, the
alignment marker 40 does not extend to the periphery of the strike
face 22, which is defined by the top edge 24, bottom edge 26, toe
edge 28, and heel edge 30. That is, the edge 44 of the alignment
marker 40 does not intersect the top edge 24, bottom edge 26, toe
edge 28, and heel edge 30. In an embodiment in which the golf club
head 20 is a driver, the distance w between the most extreme bottom
edge of the alignment marker to the bottom edge 26 is approximately
1 cm, the distance x between the most extreme top edge of the
alignment marker and the top edge 22 is approximately 1 cm, the
distance y between the most extreme toe edge of the alignment
marker and the toe edge 28 is approximately 1.8 cm, and distance z
between the most extreme heel edge of the alignment marker and the
heel edge 28 is approximately 2.0 cm. In another embodiment in
which the golf club head 20 is a fairway wood, the distance w
between the most extreme bottom edge of the alignment marker and
the bottom edge 26 is approximately 3 mm, the distance x between
the most extreme top edge of the alignment marker and the top edge
22 is approximately 1.5 cm, the distance y between the most extreme
toe edge of the alignment marker and the toe edge 28 is
approximately 1.5 cm, and distance z between the most extreme heel
edge of the alignment marker and the heel edge 28 is approximately
1.5 cm.
[0015] In the illustrated embodiment, the alignment marker 40 is in
the shape of an ellipse. However, the alignment marker 40 is shaped
differently in other embodiments. For example, in an alternative
embodiment, the alignment marker 40 is in the shape of a circle. In
another embodiment, the alignment marker is a square. In a further
embodiment, the edge 44 of the alignment marker is spaced from, but
follows the shape of the periphery of the strike plate 22.
[0016] In an embodiment of the golf club head 20 in which the loft
is that of a driver, the golf club head 22 is preferably fabricated
from titanium alloy casings that are welded to each other to define
the golf club head 20. In an embodiment of the golf club head 20 in
which the loft is that of a fairway wood, the strike face 22 is a
casing of 465 steel, while the reminder of the body is a casing of
17-4 stainless steel. These two casings are welded to each other to
define the golf club head 20. In each of these embodiments, the
portion of the metallic wall that defines the strike face 22 is
located entirely within one casing. In other embodiments, the
metallic wall is a material other than titanium alloy and/or a
stainless steel, such as aluminum alloys and magnesium alloys.
[0017] After the metallic body of the golf club head 20 has been
fabricated, the alignment marker 40 is created according to the
process illustrated in FIG. 3. As is set forth in FIG. 3, at a step
50, a surface finish is created in the strike face 22. In a
preferred embodiment, a 180 grit scratch surface finish is created
in the bare, exposed metal of the strike face with a sand paper
wheel. In alternative embodiments, the surface finish is finer or
coarser, but preferably conforms to USGA standards. In alternative
embodiments, the surface finish is formed in the strike face 22 by
other techniques, such as by machining, grinding, etching, etc.
[0018] After the strike face 22 has been surface-finished, at step
52, the strike face 22 is masked such that the only exposed portion
of the face is that where the alignment marker 40 should be finally
located. Thereafter, at a step 54, a preface of the alignment
marker 40 is created by applying a very thin coating of a material
to the unmasked area of the strike face 22. In the preferred
embodiment, a plastic, polyvinylidenflouride (PVDF), is uniformly
sprayed on the strike face at 400.degree. C. to create a coating
less than 0.001 inches thick, more preferably less than 0.0005
inches thick. In other embodiments, the PVDF is at lower
temperatures, but is preferably above 300.degree. C. In further
embodiments, other materials are used to coat the alignment marker
40, such as other plastics, metal oxides, paints, dies, and
ceramics.
[0019] After the preface of the alignment marker 40 is created by
applying the coating to the unmasked area of the strike face 22,
the mask is removed at step 56. The alignment marker is then
completed at step 58 by buffing (polishing) down the coating. In
the preferred embodiment, the coating is buffed down to slightly
below or at the edges of the previously applied surface finish
scratches such that the coating primarily or substantially only
resides in the valleys of the surface finish scratches of the metal
strike face. In this manner, an entirety of the metal strike face
has a substantially uniform surface finish and a substantially
uniform hardness, namely that of the surface-finished metal. Thus,
the alignment marker 40 does not substantially alter or change the
physical properties of the strike face 22. Because the alignment
marker 40 does not substantially alter or change the physical
properties of the strike face 22, such as the coefficient of
friction and hardness of the strike face, it will not
substantially, i.e. measurably, affect the launch angle and spin
rate of a golf ball hit with the golf club head 20 as compared to
an identical golf club head that does not include the alignment
marker 40. Hence, other than assisting a golfer in aligning a golf
ball with the geometric center of the strike face 22, the alignment
marker 40 does not measurably affect the performance of the golf
club head.
[0020] As will be appreciated, the order of the steps illustrated
in FIG. 3 can be varied in a accordance with other embodiments of
the present invention. For example, in an alternative embodiment,
the surface finish is created after applying the coating.
Additionally, some of the steps illustrated in FIG. 3 can be
omitted. For example, in one embodiment, the surface coating is
applied without the use of a mask. In another embodiment, the
coating is applied so thinly that it does not measurably affect the
launch angle and spin rate of a golf ball hit with the golf club
head 20. In a further embodiment, the coating is thicker than that
described above but is of a material having physical properties
that do not measurably affect the launch angle and spin rate of a
golf ball hit with the golf club head 20.
[0021] The principles, preferred embodiments, and modes of
operation of the present invention have been described in the
foregoing description. However, the invention which is intended to
be protected is not to be construed as limited to the particular
embodiments disclosed. Further, the embodiments described herein
are to be regarded as illustrative rather than restrictive.
Variations and changes may be made by others, and equivalents
employed, without departing from the spirit of the present
invention. Accordingly, it is expressly intended that all such
variations, changes and equivalents which fall within the spirit
and scope of the present invention as defined in the claims be
embraced thereby.
* * * * *