U.S. patent application number 14/174905 was filed with the patent office on 2014-08-14 for golf club head.
The applicant listed for this patent is Hitoshi SAITO. Invention is credited to Hitoshi SAITO.
Application Number | 20140228146 14/174905 |
Document ID | / |
Family ID | 49954973 |
Filed Date | 2014-08-14 |
United States Patent
Application |
20140228146 |
Kind Code |
A1 |
SAITO; Hitoshi |
August 14, 2014 |
GOLF CLUB HEAD
Abstract
When a golf club head is placed in a reference state, a distance
A from a lowest part of a sole to a leading edge in a vertical
direction is 6 mm.ltoreq.A.ltoreq.10 mm. A distance B from a bottom
of the face to a top of a club head main body is 14
mm.ltoreq.B.ltoreq.18 mm. The distances A and B satisfy a
relationship 13 mm.ltoreq.(A+B)/2.ltoreq.19 mm. When the sole is
lifted for 6 mm from the ball bottom, a center of the face is about
3.6 mm above a ball equator and 2.4 mm below the ball equator. When
the distance A is the minimum value of 6 mm and the distance B is
the minimum value of 14 mm, the center of the face is located at
about 7.0 mm below the ball equator.
Inventors: |
SAITO; Hitoshi; (Hyogo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAITO; Hitoshi |
Hyogo |
|
JP |
|
|
Family ID: |
49954973 |
Appl. No.: |
14/174905 |
Filed: |
February 7, 2014 |
Current U.S.
Class: |
473/324 |
Current CPC
Class: |
A63B 53/0433 20200801;
A63B 53/0487 20130101; A63B 53/0408 20200801 |
Class at
Publication: |
473/324 |
International
Class: |
A63B 53/04 20060101
A63B053/04 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 8, 2013 |
JP |
2013-023002 |
Claims
1. A golf club head, comprising: a head main body; a sole portion
on the head main body; and a face portion having a leading edge at
a lower portion thereof, wherein said sole portion is arranged so
that a lowest point of the sole portion is away from the leading
edge by a distance A in a vertical direction and the lowest point
of the sole portion is away from an highest point of the head main
body by a distance B to satisfy the following conditions when the
golf club head is placed in a reference state where the head main
body is placed on a horizontal surface while maintaining a specific
lie angle and a specific loft angle: 6 mm.ltoreq.A.ltoreq.10 mm, 14
mm.ltoreq.B.ltoreq.18 mm, 13 mm.ltoreq.(A+B)/2.ltoreq.19 mm, said
face portion is arranged so that a center of the face portion is
situated near a ball equator between about 3.6 mm above and 2.4 mm
below in a height direction of the face portion when the sole
portion is lifted for 6 mm from a ball bottom, and said face
portion is arranged so that the center of the face portion is
situated at about 7.0 mm below the ball equator in the height
direction of the face portion when the distance A is 6 mm and the
distance B is 14 mm even when the sole portion is lifted only for
1.4 mm from the ball bottom.
Description
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
[0001] The present invention relates to a putter-type golf club
head.
[0002] In playing golf, a putter is expected to reduce duff shots
when used. Patent Reference 1 has disclosed a conventional golf
club. A club face of the conventional golf club has a height of 22
mm.
[0003] Furthermore, Patent reference 2 has disclosed another
conventional golf club. In the conventional golf club disclosed in
Patent Reference 2, an intersection of a face and a sole of a
putter are formed as an R-shape, and the height of the part having
the R-shape is about 8 mm.
[0004] Moreover, Patent reference 3 has disclosed a still further
conventional golf club. According to the paragraph [0010] of Patent
Application 3, a diameter of a golf ball is set as 1.68 inches
(42.67 mm) or larger as standard. Since most golf balls
commercially available now have diameters of about 43 mm, so that,
as for the face dimension, the diameter F of the face is to be in a
range of 3.5 to 5.2 mm when B=43 mm is applied in the above
formula. Needless to say, the dimension of the face would vary when
the standard diameter of a ball is different. In addition, a front
part . . . and has a sole (5), in which a lower edge of the face is
cut in the range of 0.8 to 1.2 cm. Further, the diameter F of the
face is within the range of 3.5 to 5.2 mm seems to be a typing
error, and it is supposed that the diameter F of the face is within
the range of 34.4 to 51.6 cm.
[0005] Patent Reference 1: Japanese Patent Application Publication
No. 2003-275348
[0006] Patent Reference 2: Japanese Utility Model Application No.
S56-132730 (Japanese Utility Model Application Publication No.
S58-40172)
[0007] Patent Reference 3: Japanese Utility Model No. 3,147,604
[0008] According to Patent Reference 2, a lower half part of a
hitting area E is to be secured for 12.05 mm or 13.15 mm at the
maximum. Accordingly, in the case of the putter disclosed in Patent
Reference 2, 24.10 mm or 26.30 mm is secured as a distance from the
bottom of the face to the top of the club head main body in a
vertical direction.
[0009] Patent Reference 1 has disclosed that the height of the face
is 22 mm. However, it may be difficult that the height of the face
can be 22 mm while keeping the "8 mm" dimension in the putter
disclosed in Patent Reference 2. According to Patent Reference 2,
the lower half part of the hitting area E is to be secured for
12.05 mm or 13.15 mm at the maximum and there is no possibility
that the dimension will be an issue upon hitting. Accordingly, it
is suggested that it is important to secure 24.10 mm or 26.30 mm as
a distance from the bottom of the face to the top of the club head
main body in the vertical direction. Here, "secure" means "surely
achieve" and "surely keep/remain", and such suggestion is an issue
to achieve the face section height of 22 mm while keeping the "at
least 8 mm" dimension in the putter disclosed in Patent Reference 2
as described above.
[0010] In addition, according to the putter disclosed in Patent
Reference 2, the intersection between the face and the sole is
formed in an R-shape, and the heights of the sections formed in the
R-shapes are set about 8 mm. On the other hand, according to the
putter disclosed in Patent reference 3, the distance from the
lowest part of the sole to the leading edge, i.e., the lowest blade
section of the face, in the vertical direction seems to be 0 mm.
Therefore, those ideas are incompatible with each other. Thus, it
is difficult to apply the concept of Patent reference 3 to the
putter of Patent Reference 2 even if attempted. In addition, even
if such application is possible, the distance from the bottom of
the face to the top of the club head main body will be the values
of 3.5 to 5.2 cm minus 0.8 to 1.2 cm in the vertical direction.
[0011] According to the putter disclosed in Patent reference 2, it
appears to be achievable to reduce duff shots, in which a leading
edge hits the ground, but the height of the face is 24.1 mm or 26.3
mm or larger. Therefore, upon hitting an equator of a ball at the
center of the face in the height direction, the sole will hit the
ground, which will possibly result in a duff shot. In other words,
the putter disclosed in Patent reference 2 does not solve the both
issues, i.e., the duff shots by leading edge and the duff shots by
the sole, at the same time.
[0012] According to the putter disclosed in Patent Reference 3, the
distance from the lowest part of the sole to the leading edge,
i.e., the lowest blade part of the face, is considered as 0 mm in
the vertical direction. Accordingly, the chance of the duff shot,
in which the leading edge hits the ground, is considered to be
higher. On the other hand, according to Patent Reference 3, it is
achieved to reduce the duff shots by having a rear part thereof
touch the ground upon fully swinging the putter.
[0013] The putter disclosed in Patent Reference 3 does not solve
both the duff shots by the leading edge and the duff shots by the
sole together. Here, in view of Patent Reference 3, if a player
hits a ball lifting a sole of the club for 0.8 to 1.2 cm, it may be
possible to expect that a duff shot, in which the leading edge hits
the ground, may not occur even when the distance from the lowest
part of the sole to the leading edge, the lowest blade part of the
face, is 0 mm. However, this concept is incompatible at all with
forming of the intersection of the face and the sole as the R-shape
and having the height of the R-shaped section for around 8 mm, and
is considered to be a serious issue for combining those
concepts.
[0014] An object of the invention is to provide a putter-type golf
club head capable of reducing duff shots. According to the present
invention, it is possible to reduce two types of duff shots, a
leading edge of the golf club hits the ground, and a sole of the
golf club hits the ground.
[0015] Further objects and advantages of the invention will be
apparent from the following description of the invention.
SUMMARY OF THE INVENTION
[0016] In order to attain the objects described above, according to
the present invention, when a putter-type golf club head is placed
in a reference state where a club head is placed on a horizontal
surface while keeping a specified lie angle and loft angle, a
distance A from a lowest part of a sole to a leading edge, that is,
a lowest blade part of a face, in a vertical direction is in a
range of 6 mm.ltoreq.A.ltoreq.10 mm. Further, a distance B from a
bottom of the face to a top of a club head main body is 14
mm.ltoreq.B.ltoreq.18 mm. Further, the distances A and B satisfy a
relationship 13 mm.ltoreq.(A+B)/2.ltoreq.19 mm.
[0017] According to the present invention, when the sole is lifted
for 6 mm from the ball bottom, a center of the face in a height
direction is about 3.6 mm above a ball equator and 2.4 mm below the
ball equator, i.e., near the ball equator. In addition, when the
distance A is the minimum value of 6 mm and the distance B is the
minimum value of 14 mm, even when the sole is lifted only for 1.4
mm from the ball bottom, the center of the face in the height
direction is located at about 7.0 mm below the ball equator.
[0018] According to the present invention, when the sole is lifted
for 6 mm from the bottom of the ball having a radius of 21.4 mm,
the center of the face in the height direction is located in the
range of 3.6 mm above and 2.4 mm below the ball equator. When the
sole is lifted for 6 mm from the bottom of the ball having a radius
of other than 21.4 mm, the center of the face in the height
direction is located in the range from 3.6 mm above the ball
equator to 2.4 mm below the ball equator.
[0019] According to the present invention, when the distance A from
the lowest part of the sole to the leading edge, that is, the
lowest blade section of the face in the vertical direction, is in
the range of 6 mm.ltoreq.A.ltoreq.10 mm, it is achievable to reduce
duff shots, in which the leading edge hits the ground. At the same
time, when the distance B from the bottom of the face to the top of
the club head main body in the vertical direction is in the range
of 14 mm.ltoreq.B.ltoreq.18 mm, a player tends to lift the sole
from the ground. Therefore, a player swing form tends to lift the
sole from the ground and it is achievable to reduce duff shots, in
which the sole hits the ground.
[0020] More specifically, when a player holds a putter having the
putter-type golf club head of the invention according to the claims
of this patent application, since the distance B is in the range of
14 mm.ltoreq.B.ltoreq.18 mm, he/she visually feels the face height
is low (thin). Therefore, he/she lifts the sole from the ball's
bottom so as to position the center of the face in the height
direction to near the ball's equator. In other words, a player
tries to lift the sole from the ball's bottom to position the
center of the face in the height direction to near the ball's
equator, whereby it is achievable to reduce frequency of duff
shots, in which the sole hits the ground. Here, if the sole is
lifted for 6 mm from the ball's bottom, the center of the face in
the height direction is located within 3.6 mm above the ball's
equator and within 2.4 mm below the ball's equator, i.e., near the
ball's equator.
[0021] Furthermore, in actual playing of golf, the sole may be
occasionally lifted for less than 6 mm, but in case the distance A
is the minimum value of 6 mm and the distance B is the minimum
value of 14 mm, even when the sole is lifted only for 1.4 mm from
the ball's bottom, the center of the face in the height direction
is located at about 7.0 mm below the ball's equator. Since the
distance B is 144 mm, there is about 7 mm of the face above the
center of the face in the height direction. Therefore, the face
hits below the ball's equator, and even in this case, it is
possible to expect a certain degree of rolling of the ball.
Needless to say, as long as the sole is lifted for about 2 mm or
about 3 mm from the ball's bottom, it is possible to reduce duff
shots, in which the sole hits the ground, better than the case of
1.4 mm.
[0022] According to the invention, it is achievable to reduce duff
shots, in which a leading edge hits the ground. At the same time,
it is achievable to reduce duff shots, in which a sole hits the
ground.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIGS. 1(A) and 1(B) are schematic views showing a
putter-type golf club head according to an embodiment of the
invention, in which FIG. 1(A) is an illustrative side view thereof
and FIG. 1(B) is an illustrative top view thereof; and
[0024] FIGS. 2(A) and 2(B) are schematic views showing a
geometrical relationship between the putter-type golf club head
shown FIG. 1, the turf, a ball, etc., in which FIG. 2(A) shows a
case where a sole of the golf club head is lifted for 6 mm from the
ball bottom, and FIG. 2(B) shows a case where the sole of the golf
club head is lifted for 3 mm from the ball bottom.
DETAILED DECSRIPTION OF THE PREFERRED EMBODIMENTS
[0025] Hereunder, a putter-type golf club head according to an
embodiment of the present invention will be described with
reference to the accompanying drawings. Here, the putter-type golf
club head of the invention is not limited to the one described in
the following embodiment, and can be embodied in various manners
with suitable changes, alterations, and/or modifications within a
scope of the invention.
[0026] As shown in FIGS. 1(A) and 1(B), a putter-type golf club
head 1 of the embodiment includes a hosel 10 and a club head main
body 11. The club head main body 11 includes a face 12 and a sole
13, and is made of a heavy material such as metal.
[0027] As shown in FIGS. 2(A) and 2(B), in the putter-type golf
club head 1, in a reference state where the golf club head 1 is
placed on a horizontal surface keeping a specified lie angle and a
loft angle, a distance A in a vertical direction from the lowest
section of the sole 13 to a leading edge of the face 12, which is a
lowest blade section, is in the range of 6 mm.ltoreq.A.ltoreq.10 mm
(preferably 6 mm.ltoreq.A.ltoreq.8 mm), and a distance B in the
vertical direction from a bottom of the face 12 to a top of the
club head main body 11 is in the range of 14 mm.ltoreq.B.ltoreq.18
mm (preferably 15 mm.ltoreq.B.ltoreq.17 mm). In addition, A+B/2 is
in the range of 13 mm A+B/2.ltoreq.19 mm. According to the
embodiment, the values are set as A=7 mm and B=16 mm as an example.
Here, the ratio B/A is within the range of
1.4.ltoreq.B/A.ltoreq.3.0. In a case of an example of a
conventional putter-type golf club head, A is about 1 mm and B is
about 25 mm, and the ratio B/A is 25.0. The distance B in the
vertical direction from the bottom of the face 12 to the top of the
club head main body 11 can be set equal to the distance in the
vertical direction from the bottom of the face 12 to the top of the
face 12.
[0028] As shown in FIG. 2(A), according to the putter-type golf
club head 1, when the sole 13 is lifted for about 6 mm (4 mm from
the turf 2) from a bottom of a ball 3, a center of the face 12 in a
height direction thereof is 6 mm+7 mm (distance A)+8 mm (distance
B/2)=21 mm from the bottom of the ball 3. The distance of 21 mm
means, for example, a position slightly below an equator of a golf
ball whose radius is 21.4 mm.
[0029] Here, in case the distance A is the minimum value of 6 mm,
and the distance B is the minimum value of 14 mm, when the sole 13
is lifted for 6 mm from the ball's bottom, a center of the face 12
in the height direction is located at 2.4 mm below the ball's
equator. In addition, in case the distance A is the maximum value
of 10 mm and the distance B is the maximum value of 18 mm, when the
sole 13 is lifted for 6 mm from the ball's bottom, the center of
the face 12 in the height direction is located at 3.6 mm above the
ball's equator. Therefore, in case of the putter-type golf club 1
having the distances A and B within the above-described ranges,
when the sole 13 is in a state of being lifted for 6 mm from the
ball's equator, the center of the face 12 in the height direction
is within 3.6 mm above the ball's equator and within 2.4 mm below
the ball's equator, i.e., near the ball's equator.
[0030] Furthermore, when the distance A is the minimum value of 6
mm and the distance B is the minimum value of 14 mm, as shown in
FIG. 2(B), when the sole 13 is lifted for 3 mm from the ball's
bottom, the center of the face 12 in the height direction is
located at 5.4 mm below the ball's equator. In addition, in case
the distance A is the maximum value of 10 mm and the distance B is
the maximum value of 18 mm, when the sole 13 is lifted for 3 mm
from the ball's bottom, the center of the face 12 in the height
direction is located at 1.6 mm above the ball's equator.
[0031] Moreover, in case the distance A is the minimum value of 6
mm and the distance B is the minimum value of 14 mm, when the sole
13 is lifted for 2 mm from the ball's bottom, the center of the
face 12 in the height direction is located at 6.4 mm below the
ball's equator. Even in this case, the distance B is 14 mm, which
in turn there is 7 mm of the face 12 above the center of the face
12 in the height direction. Therefore, even when the center of the
face 12 in the height direction is located at 6.4 mm below the
ball's equator, it is possible to hit the ball below the equator
thereof with the face 12. In addition, in case the distance A is
the maximum value of 10 mm and the distance B is the maximum value
of 18 mm, when the sole 13 is lifted for 2 mm from the ball's
bottom, the center of the face 12 in the height direction is
located at 0.6 mm above the ball's equator.
[0032] In case the distance A is the minimum value of 6 mm and the
distance B is the minimum value of 14 mm, when the sole 13 is
lifted for 1.4 mm from the ball's bottom, the center of the face 12
in the height direction is located at 7.0 mm below the ball's
equator. Even in this case, the distance B is 14 mm, which in turn
there is 7 mm of the face 12 above the center of the face 12 in the
height direction. Therefore, even when the center of the face 12 in
the height direction is located at 7.0 mm below the ball's equator,
it is still possible to hit the ball's equator with the face 12.
Moreover, in case the distance A is the maximum value of 10 mm and
the distance B is the maximum value of 18 mm, when the sole 13 is
lifted for 1.4 mm from the ball's bottom, the center of the face 12
in the height direction is located at 0 mm above the ball's
equator.
[0033] Here, as for the preferred distances A and B, according to
similar calculation, it is possible to know the center of the face
12 in the height direction relative to the ball's equator, etc.
when the sole 13 is lifted from the ball's bottom.
[0034] According to the above-described configuration, with the
distance A, a distance from the lowest part of the sole 13 to the
lowest blade part of the face 12, i.e., the leading edge, in the
vertical direction is set in the range of 6 mm.ltoreq.A.ltoreq.10
mm, it is possible to reduce duff shots, which is caused by leading
edge's hitting the ground. At the same time, with the distance B, a
distance from the bottom of the face 12 to the top of the club head
main body 11 in the vertical direction, is set in the range of 14
mm.ltoreq.B.ltoreq.18 mm, it is possible to have the sole 13 tend
to be lifted from the ground and thereby it is possible to reduce
duff shots, which is caused by hitting the ground with the sole 13.
More specifically, when a player holds a putter, which has the
putter-type golf club head configured as described in claims of the
invention, since the distance B is in the range of 14
mm.ltoreq.B.ltoreq.18 mm, the player visually feels the face's
height is small (thin), he/she lifts the sole 13 from the ball's
bottom so as to position the center of the face 12 to near the
ball's equator in the height direction. In other words, since the
player will try to lift the sole 13 from the ball's bottom so as to
position the center of the face 12 to near the ball's equator in
the height direction, it is achievable to reduce the frequency of
duff shots, which are cause by hitting the ground with the sole 13.
Here, as also described above, when the sole 13 is lifted for 6 mm
from the ball's bottom, the center of the face 12 in the height
direction is located within 3.6 mm above from the ball's equator
and 2.4 mm below the ball's equator, i.e., near the ball's equator.
On the other hand, in case of actual playing of golf, the sole may
be lifted for less than 6 mm sometimes, but even when the sole is
lifted only for 1.4 mm from the ball's bottom in case the distance
A is the minimum value of 6 mm and the distance B is the minimum
value of 14 mm, the center of the face in the height direction is
located at 7.0 mm generally under the ball's equator. Since the
distance B is 14 mm, there is generally 7 mm of the face 12 above
the center thereof in the height direction and the face 12 hits
below the ball's equator. Therefore, even in this case, a certain
level of rolling of the ball can be expected. In addition, as long
as the sole 13 is lifted for as small as 2 mm from the ball's
bottom, it is achievable to reduce duff shots, which are by hitting
the ground with the sole 13. Needless to say, when the sole 13 is
lifted for 3 mm from the ball's bottom, it is achievable to reduce
duff shots more than when the sole 13 is lifted for 2 mm.
[0035] Moreover, according to the embodiment, in the putter-type
golf club head 1, a face progression (a distance between a leading
edge and a shaft's axis plane square to the playing direction) C is
set in the range of 35 mm.ltoreq.C.ltoreq.50 mm (preferably 38
mm.ltoreq.C.ltoreq.47 mm). In addition, a width D from a heal to a
toe of the head is set in the range 108 mm.ltoreq.177.8 mm
(preferably 120 mm.ltoreq.D.ltoreq.162 mm). Needless to say, when
there is restriction about the golf club head in terms of rules of
golf, those values are set in the range specified in such
rules.
[0036] Furthermore, according to the putter-type golf club head 1
of the embodiment, when the sole's lowest part is positioned behind
the shaft's axis, it is achievable to reduce topped shots even
more, which are caused by head's being bounced by the ground. For
example, before the sole's lowest part hits the ground, the face
hits the ball.
[0037] Moreover, also when a player hits a ball from somewhere
around the green towards the green using a putter having the
putter-type golf club head 1, it is achievable to reduce duff
shots. Furthermore, when a player hits a ball from the rough around
the green towards the green, if the distance B from the bottom of
the face 12 to the top of the club head main body 11 in the
vertical direction is small, it is achievable to reduce resistance
of the turf 2, which is significantly affected by the height of the
face's surface, so that it is easy to control the club head speed
at impact.
[0038] In addition, when the center of gravity of the golf club
head is configured to be close an axis of the shaft attached to the
hosel 10, it is achievable to stabilize the club head actions
during swing.
[0039] Here, when a player swings a club in the rough, when the
distance B from the bottom of the face 12 to the top of the club
head main body 11 in the vertical direction is small, while the
resistance the face 12 receives from the turf 2 is smaller, the
resistance caused by the turf's tangling onto the neck of the golf
club will not change so much. Therefore, it may increase a chance
of missed shots such as a ball's traveling leftward. When the face
progression C is in the range of 35 mm.ltoreq.C.ltoreq.50 mm, the
face can hit the ball before receiving resistance from the turf 2
on the neck of the golf club, so that it is achievable to reduce a
chance of the above-described missed shots.
[0040] While the invention has been explained with reference to the
specific embodiments of the invention, the explanation is
illustrative and the invention is limited only by the appended
claims.
* * * * *