U.S. patent application number 13/043867 was filed with the patent office on 2011-06-30 for iron head.
Invention is credited to Hideo SHIMAZAKI.
Application Number | 20110159984 13/043867 |
Document ID | / |
Family ID | 43497816 |
Filed Date | 2011-06-30 |
United States Patent
Application |
20110159984 |
Kind Code |
A1 |
SHIMAZAKI; Hideo |
June 30, 2011 |
IRON HEAD
Abstract
An iron head is provided with a recess portion provided in an
upper portion of a backside surface thereof, and a protruding
portion provided at a lower portion of the backside surface. A
first hollow portion is provided on a heel side from a bottom
surface of a recess portion to a sole surface; and a second hollow
portion is disposed on a toe side. The first hollow portion and the
second hollow portion do not exist behind a sweet area. The first
hollow portion and the second hollow portion may be filled with a
shock absorber formed of a rubber or an elastomer.
Inventors: |
SHIMAZAKI; Hideo;
(US) |
Family ID: |
43497816 |
Appl. No.: |
13/043867 |
Filed: |
March 9, 2011 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
12507266 |
Jul 22, 2009 |
|
|
|
13043867 |
|
|
|
|
Current U.S.
Class: |
473/331 ;
473/332; 473/350 |
Current CPC
Class: |
A63B 60/54 20151001;
A63B 2209/00 20130101; A63B 53/047 20130101; A63B 2053/0491
20130101; A63B 53/0408 20200801; A63B 53/0433 20200801; A63B
53/0475 20130101; A63B 53/04 20130101 |
Class at
Publication: |
473/331 ;
473/350; 473/332 |
International
Class: |
A63B 53/04 20060101
A63B053/04 |
Claims
1. An iron head comprising: a striking face; a backside surface; a
sole surface; a hosel; a recess portion provided in an upper
portion of the backside surface; a protruding portion provided at a
lower portion of the backside surface and projecting backward; a
first hollow portion provided on a heel side of the protruding
portion; and a second hollow portion disposed on a toe side and
inside the protruding portion, said protruding portion including a
middle portion between the first hollow portion and the second
hollow portion, wherein said first hollow portion is disposed away
from the second hollow portion by a distance gradually increasing
from an upper surface of the protruding portion toward the sole
surface.
2. The iron head according to claim 1, wherein at least one of said
first hollow portion and said second hollow portion penetrates from
an upper surface of the protruding portion to the sole surface, and
has a first lid to close the sole surface.
3. The iron head according to claim 1, wherein at least one of said
first hollow portion and said second hollow portion has a second
lid to close an upper portion thereof.
4. The iron head according to claim 1, wherein said first hollow
portion is disposed away from the second hollow portion by the
distance equal to a distance between the upper surface of the
protruding portion and the sole surface.
5. The iron head according to claim 1, wherein said first hollow
portion is disposed away from the second hollow portion by the
distance of 10 to 30 mm.
6. The iron head according to claim 1, wherein said first hollow
portion is disposed away from the second hollow portion by the
distance of 10 to 30 mm at the upper surface of the protruding
portion.
7. The iron head according to claim 1, wherein at least one of said
first hollow portion and said second hollow portion is disposed not
to reach the sole surface.
8. The iron head according to claim 1, wherein at least one of said
first hollow portion and said second hollow portion is filled with
a shock absorber.
9. The iron head according to claim 9, wherein said shock absorber
is made of a rubber or an elastomer.
10. The iron head according to claim 1, wherein said striking face
includes a plurality of score lines including a longest score line,
said middle portion being disposed so that a center line of the
middle portion is aligned with a center line of the longest score
line.
11. The iron head according to claim 1, wherein said first hollow
portion has a first length in a vertical direction, said second
hollow portion having a second length in the vertical direction
greater than the first length.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation application of a prior application
Ser. No. 12/507,266, filed Jul. 22, 2009, pending.
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
[0002] The present invention relates to an iron head for an iron
type golf club. More particularly, the present invention relates to
an iron head having a hollow portion.
[0003] An iron type golf club includes a shaft and an iron head
disposed at a distal end of the shaft, so that a striking face of
the iron head hits a ball. The shaft is inserted and fixed into a
hosel formed in the iron head. A side of the iron head where the
hosel is formed is referred to as a heel, and an opposite side of
the iron head, i.e., a distal end side thereof, is referred as a
toe. A bottom side of the iron head facing a ground surface is
referred to as a sole. A plurality of grooves, i.e., score lines,
is formed in the striking face of the iron head with a certain
distance therebetween in a vertical direction.
[0004] Patent Reference 1 has disclosed a conventional iron head.
The conventional iron head has a recess portion disposed at an
upper portion of a back surface thereof, and a hollow portion is
disposed behind the striking face below the recess portion. With
the hollow portion formed in the iron head, it is possible to lower
the center of gravity of the iron head. Further, the center of
gravity is shifted backward from the striking face of the iron
head, thereby expanding a sweet area thereof. In addition, when the
hollow portion is formed in the iron head, a weight of the iron
head is reduced. Therefore it is possible to increase a size of the
iron head without increasing the weight thereof. Further, when a
weight distribution increases on the toe side and the heel side of
the iron head, it is possible to increase the sweet area of the
iron head without increasing the weight thereof.
[0005] In Patent Reference 1, the conventional iron head has the
hollow portion extending from the proximity of the toe to the
proximity of the heel. A thickness of a face plate, or a distance
between the striking face and the hollow portion, is substantially
uniform between the toe side and the heel side.
[0006] Patent Reference 2 has disclosed another type of
conventional iron heads. The conventional iron head has a hollow
portion disposed behind a striking face, and a shock absorber made
of a rubber, urethane, or silicone is disposed in the hollow
portion. The shock absorber has a thickness about 1.5 mm to 8.0
mm.
[0007] Patent Reference 3 has disclosed a golf club having a
striking face capable of bending like a wood club. With the
configuration, it is possible to hit a ball for a long
distance.
[0008] Patent Reference 4 has disclosed an iron head having a
hollow portion and a viscoelastic body disposed in the hollow
portion. The viscoelastic body enables to dampen a vibration of the
iron head. [0009] Patent Reference 1: Japanese Patent Publication
No. 2000-210400 [0010] Patent Reference 2: Japanese Patent
Publication No. 09-117537 [0011] Patent Reference 3: U.S. Pat. No.
4,398,965 [0012] Patent Reference 4: Japanese Patent Publication
No. 06-319836
[0013] In the conventional iron head disclosed in Patent Reference
1, the thickness of the face plate between the striking face and
the hollow portion, in other words, the distance between the
striking face and the hollow portion, is substantially uniform in a
toe to heel direction. When the golf club having the iron head hits
a ball at a middle portion thereof, it is difficult to obtain a
strong impact feeling due to the hollow portion formed behind the
middle portion and the small thickness of the face plate at the
middle portion of the iron head.
[0014] In view of the problems described above, an object of the
present invention is to provide an iron head having a wide sweet
area and capable of obtaining a strong impact feeling when hitting
a ball at a middle portion thereof.
SUMMARY OF THE INVENTION
[0015] In order to attain the object described above, according to
a first aspect of the present invention, an iron head is provided
with a striking face; a backside surface; a sole surface; a hosel;
a recess portion provided in an upper portion of the backside
surface; a protruding portion provided at a lower portion of the
backside surface and projecting backward; a first hollow portion
provided on a heel side of the protruding portion; and a second
hollow portion disposed on a toe side of the protruding portion.
The protruding portion has a middle portion between the first
hollow portion and the second hollow portion.
[0016] According to a second aspect of the present invention, in
the iron head in the first aspect, at least one of the first hollow
portion and the second hollow portion penetrates from an upper
surface of the protruding portion to a sole surface, and has a
first lid to close the sole surface.
[0017] According to a third aspect of the present invention, in the
iron head in the first aspect, at least one of the first hollow
portion and the second hollow portion has a second lid to close an
upper portion thereof.
[0018] According to a fourth aspect of the present invention, in
the iron head in the first aspect, the first hollow portion is
disposed away from the second hollow portion by a distance equal to
a distance between the upper surface of the protruding portion and
the sole surface.
[0019] According to a fifth aspect of the present invention, in the
iron head in the first aspect, the first hollow portion is disposed
away from the second hollow portion by a distance of 10 to 30
mm.
[0020] According to a sixth aspect of the present invention, in the
iron head in the first aspect, the first hollow portion is disposed
away from the second hollow portion by a distance gradually
increasing from the upper surface of the protruding portion toward
the sole surface.
[0021] According to a seventh aspect of the present invention, in
the iron head in the first aspect, the first hollow portion is
disposed away from the second hollow portion by a distance of 10 to
30 mm at the upper surface of the protruding portion.
[0022] According to an eighth aspect of the present invention, in
the iron head in the first aspect, at least one of the first hollow
portion and the second hollow portion is disposed not to reach the
sole surface.
[0023] According to a ninth aspect of the present invention, in the
iron head in the first aspect, at least one of the first hollow
portion and the second hollow portion is filled with a shock
absorber.
[0024] According to a tenth aspect of the present invention, in the
iron head in the ninth aspect, the shock absorber is made of a
rubber or an elastomer.
[0025] According to an eleventh aspect of the present invention, an
iron head is provided with a striking face; a backside surface; a
sole surface; a hosel; a recess portion provided in an upper
portion of the backside surface; a protruding portion provided at a
lower portion of the backside surface and projecting backward; and
a hollow portion extending from a toe side to a heel side of the
protruding portion. The protruding portion has a middle portion
with a first face plate thickness in a toe to heel direction
thereof. The first face plate thickness is larger than a second
face plate thickness on a toe side with respect to the middle
portion and a third face plate thickness on a heel side with
respect to the middle portion.
[0026] According to a twelfth aspect of the present invention, in
the iron head in the eleventh aspect, the hollow portion has a
length of 15 to 30 mm in from the toe side to the heel side.
[0027] According to a thirteenth aspect of the present invention,
in the iron head in the eleventh aspect, the middle portion has a
width of 15 to 30 mm in the toe to heel direction.
[0028] According to a fourteenth aspect of the present invention,
in the iron head in the eleventh aspect, the middle portion has the
first face plate thickness equal to or more than 2.5 mm. The first
face plate thickness is larger than the second face plate thickness
and third face plate thickness by equal to or more than 0.5 mm.
[0029] According to a fifteenth aspect of the present invention, in
the iron head in the eleventh aspect, the middle portion has the
first face plate thickness increasing gradually from an upper
portion toward a lower portion thereof.
[0030] According to a sixteenth aspect of the present invention, in
the iron head in the eleventh aspect, the hollow portion penetrates
from an upper surface of the protruding portion to the sole
surface, and includes a bottom surface closed with a bottom
lid.
[0031] According to a seventeenth aspect of the present invention,
in the iron head in the eleventh aspect, a shock absorber fills the
hollow portion.
[0032] According to an eighteenth aspect of the present invention,
in the iron head in the seventeenth aspect, the shock absorber is
made of a rubber or an elastomer.
[0033] In the first aspect of the present invention, the iron head
is provided with the first hollow portion and the second hollow
portion on the toe side and the heel side of the middle portion,
respectively, thereby reducing a total weight of the iron head.
Accordingly, it is possible to enlarge a sweet area without
increasing the total weight. Further, it is possible to increase a
partial weight on the toe side and the heel side, thereby
increasing the sweet area of the iron head. In the iron head in the
first aspect, the hollow portion is not provided behind the middle
portion. Accordingly, it is possible to obtain a strong hitting
impact feeling when hitting a ball at the middle portion.
[0034] In the eleventh aspect of the present invention, the iron
head is provided with the hollow portion extending from the toe
side toward the heel side of the middle portion. Accordingly, it is
possible to reduce the total weight of the iron head. Therefore, it
is possible to increase a size of the iron head without increasing
the total weight thereof. In addition, it is possible to increase a
partial weight on the toe side and the heel side of the iron head
without increasing the total weight of the iron head, thereby
increasing the sweet area. In the iron head, the face plate has the
thickness at the middle portion greater than that of the toe side
and the heel side. Accordingly, it is possible to obtain a strong
hitting impact feeling when hitting a ball at the middle
portion.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] FIG. 1 is a rear view of an iron head according to a first
embodiment of the present invention;
[0036] FIG. 2 is a side view of the iron head viewed from a toe
side thereof according to the first embodiment of the present
invention;
[0037] FIG. 3 is a sectional view of the iron head taken along a
line III-III in FIG. 1 according to the first embodiment of the
present invention;
[0038] FIG. 4 is a sectional view of the iron head taken along a
line IV-IV in FIG. 1 according to the first embodiment of the
present invention;
[0039] FIG. 5 is a sectional view of the iron head taken along a
line V-V in FIG. 1 according to the first embodiment of the present
invention;
[0040] FIG. 6 is a sectional view of the iron head taken along a
line VI-VI in FIG. 3 according to the first embodiment of the
present invention;
[0041] FIG. 7 is a rear view of an iron head according to a second
embodiment of the present invention;
[0042] FIG. 8 is a sectional view of the iron head according to the
second embodiment of the present invention;
[0043] FIG. 9 is a sectional view of an iron head according to a
third embodiment of the present invention;
[0044] FIG. 10 is a sectional view of an iron head according to a
fourth embodiment of the present invention;
[0045] FIG. 11 is a sectional view of an iron head according to a
fifth embodiment of the present invention;
[0046] FIG. 12 is a sectional view of the iron head taken along a
line XII-XII in FIG. 11 according to the fifth embodiment of the
present invention;
[0047] FIG. 13A is an exploded sectional view of the iron head
according to the fifth embodiment of the present invention;
[0048] FIG. 13B is an exploded sectional view of the iron head
according to the fifth embodiment of the present invention;
[0049] FIG. 14 is a sectional view of an iron head according to a
sixth embodiment of the present invention;
[0050] FIG. 15 is a sectional view of an iron head according to a
seventh embodiment of the present invention;
[0051] FIG. 16 is an exploded sectional view of the iron head shown
in FIG. 15;
[0052] FIG. 17 is a sectional view of an iron head according to an
eighth embodiment of the present invention;
[0053] FIG. 18 is a sectional view of an iron head according to a
ninth embodiment of the present invention;
[0054] FIG. 19 is a sectional view of an iron head according to a
tenth embodiment of the present invention;
[0055] FIG. 20 is a sectional view of an iron head according to an
eleventh embodiment of the present invention;
[0056] FIG. 21 is a sectional view of an iron head according to a
twelfth embodiment of the present invention;
[0057] FIG. 22 is a sectional view of an iron head according to a
thirteenth embodiment of the present invention;
[0058] FIG. 23 is an exploded sectional view of the iron head
according to the thirteenth embodiment of the present
invention;
[0059] FIG. 24 is a sectional view of an iron head according to a
fourteenth embodiment of the present invention;
[0060] FIG. 25 is an exploded sectional view of the iron head
according to the fourteenth embodiment of the present
invention;
[0061] FIG. 26 is a rear view of an iron head according to a
fifteenth embodiment of the present invention;
[0062] FIG. 27 is a sectional view of the iron head taken along a
line 27-27 in FIG. 28 according to the fifteenth embodiment of the
present invention;
[0063] FIG. 28 is a sectional view of the iron head taken along a
line 28-28 in FIG. 26 according to the fifteenth embodiment of the
present invention;
[0064] FIG. 29 is an exploded perspective view of an iron head
according to a sixteenth embodiment of the present invention;
[0065] FIG. 30 is a perspective view of an elastic member according
to the sixteenth embodiment of the present invention;
[0066] FIG. 31 is a sectional view of the iron head taken along a
line 31-31 in FIG. 29 according to the sixteenth embodiment of the
present invention;
[0067] FIG. 32 is a sectional view of the iron head according to
the sixteenth embodiment of the present invention;
[0068] FIG. 33 is a sectional view of the iron head taken along a
line 33-33 in FIG. 31 according to the sixteenth embodiment of the
present invention;
[0069] FIG. 34 is a front view of an iron head according to a
seventeenth embodiment of the present invention; and
[0070] FIG. 35 is a sectional view of the iron head according to
the seventeenth embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0071] Hereunder, preferred embodiments of the present invention
will be explained with reference to the accompanying drawings.
First Embodiment
[0072] FIGS. 1 through 6 show an iron head 10 according to a first
embodiment of the present invention. The iron head 10 is provided
with a striking face 11 for hitting a ball, a toe side 12, a heel
side 13, a sole surface 14, and a hosel 15 for connecting a shaft.
Further, the iron head 10 is provided with a cavity portion 16
disposed in an upper portion of a backside surface thereof; a
protruding portion 17 disposed at a lower portion of the backside
surface thereof and projecting backward; a first hollow portion 18
disposed on the heel side 13 of the protruding portion 17 and
penetrating from a bottom surface 16b of the cavity portion 16 to
the sole surface 14; a second hollow portion 19 disposed on the toe
side of the protruding portion 17; and a bottom lid 20 disposed on
the sole surface to close the hollow portions 18 and 19.
[0073] As shown in FIG. 6, the cavity portion 16 is recessed from a
rear side of the iron head to the striking surface side thereof not
only at an upper edge 10t of the cavity portion 16 but also at both
the toe side 12 and the heel side 13. The cavity portion 16 extends
from the toe side 12 to the heel side 13. It is desirable that a
thickness of a face plate at the cavity portion 16 is between 1.5
mm and 3.5 mm, especially between 2 mm and 3 mm. As shown in FIG.
2, the cavity portion 16 has a maximum length H1 in a direction
parallel to the striking face 11 at proximity of the toe side 12.
Further, the striking face 11 has a maximum length H2 in a vertical
direction. It is desirable that the maximum length H1 is 20% to
50%, especially 25% to 40%, of the maximum length H2.
[0074] The protruding portion 17 projects backward at a lower
portion of the cavity portion 16. The protruding portion 17 has the
upper surface 16b which is substantially perpendicular to the
striking face 11. As shown in FIG. 2, the protruding portion 17 has
a maximum length H3 at the proximity of the toe side 12 in the top
to bottom direction of the iron head and in a direction parallel to
the striking face 11. It is desirable that H3 is 48% to 78%,
especially 58% to 73%, of the maximum length H2 of the striking
face in the vertical direction. A same ratio is applied to a
desirable ratio between a maximum length of the heel side 13 in the
top to bottom direction of the iron head and in the direction
parallel to the striking face 11 and a maximum length of the
striking face 11 in the top to bottom direction.
[0075] The hollow portions 18 and 19 penetrate from the upper
surface 16b of the protruding portion 17 to the sole surface 14. In
the embodiment, the hollow portions 18 and 19 have a width, in a
toe to heel direction, being substantially same anywhere from an
upper end thereof to a lower end thereof. Further, as shown in FIG.
2, the hollow portions 18 and 19 have a thickness E, a width in the
direction perpendicular to the striking face 11. The thickness E is
substantially same anywhere from the upper end of the hollow
portions 18 and 19 to the lower end thereof.
[0076] As shown in FIG. 6, the hollow portion 18 has a width W2, in
the toe to heel direction, equal to or more than 10 mm but does not
extend over the edge of the cavity portion 16 on the heel side,
more preferably, between 15 mm and 20 mm. The hollow portion 19 has
a width W3, in the toe to heel direction, equal to or more than 10
mm but does not extend over the edge of the cavity portion 16 on
the heel side, more preferably, between the 15 mm and 20 mm. A
middle portion M between the hollow portions 18 and 19 corresponds
to a sweet area situated at the lower portion of the center part of
the striking face 11. The middle portion M is not a hollow portion
and is made of a metal material such as iron and an iron-base
alloy, which are also used to produce the iron head 10.
[0077] As shown in FIG. 6, in the embodiment, the middle portion M
has the width W1, in the toe to heel direction, which is
substantially same from the upper end thereof to the lower end
thereof. It is desirable that the width W1 has a width equal to or
more than 10 mm but does not extend over the edge of the cavity
portion 16 on the toe side, more preferably, between equal to or
more than 15 mm and equal to or less than 20 mm.
[0078] The hollow portions 18 and 19 have bottom ends closed by the
bottom lid 20. As shown in FIGS. 2 and 6, the bottom lid 20 is
fitted into a recess portion 20a provided in the sole surface, and
fixed thereto by crimping, welding such as a laser welding, shrink
fitting, and cooling fitting.
[0079] As shown in FIG. 5, a depth A is a depth of the hollow
portion 19 on the backside surface side of the iron head, and a
depth B is a depth of the hollow portion 19 on the striking face 11
side thereof. As shown in FIG. 4, a depth C is a depth of the
hollow portion 18 on the backside surface side thereof and a depth
D is a depth of the hollow portion 19 on the striking face 11 side
thereof. Examples of A, B, C, D are shown in a table below for each
of iron golf clubs No. 3 through No. 9 and a pitching wedge.
TABLE-US-00001 A B C D #3 14.6 17.1 9.3 11.8 #4 15.3 18.2 9.7 12.6
#5 15.8 19 9.8 13 #6 16.1 19.7 10.2 13.7 #7 16.9 20.8 10.7 14.6 #8
17.9 21.8 11.4 15.3 #9 18.5 23 12.1 16.6 PW 18.8 23.2 12.7 17.1
[0080] In this configuration, the iron head 10 has the hollow
portion 18 and the hollow portion 19 located closer to the toe side
12 or the heel side 13 respectively outside of the middle portion M
thereof. With the hollow portions 18 and 19 formed in the iron
head, it is possible to reduce the weight of the iron head.
Therefore, it is possible to increase a size of the iron head 10
without increasing the total weight thereof. Further, when a weight
distribution increases on the toe side and the heel side of the
iron head, it is possible to increase a sweet area of the iron head
10 without increasing the total weight thereof. Because the middle
portion M is provided with no hollow portion, the iron head 10 in
this configuration is capable of providing strong impact feeling
when hitting a ball.
[0081] As examples of iron or an iron-base alloy used to produce
the iron head 10, there are stainless such as SUS630, 303 and 304;
low-carbon steel such as S20C, S15C, and S25C; and maraging steel.
A specific gravity of these materials is about 7.8 to 8.2. The iron
head may be produced by either forging or casting.
[0082] The bottom lid 20 may be made of either the iron or the
iron-base alloy mentioned above, but a metal or an alloyed metal,
which has a larger specific gravity, is more desirable as it is
capable of lowering the center of gravity of the iron head. As such
metal or alloyed metal, tungsten alloy is suitable as a specific
gravity thereof is 10 to 15. More specifically, tungsten-nickel
alloy, tungsten-copper alloy, and tungsten-iron alloy, for example,
may be used.
Second Embodiment
[0083] FIGS. 7 and 8 show an iron head 10A according to the second
embodiment of the present invention. According to the first
embodiment, the width W1 of the middle portion M in the toe to heel
direction is substantially same from the upper end thereof to the
lower end thereof. According to the second embodiment, instead of
the hollow portions 18 and 19 in the first embodiment, the iron
head 10A is provided with a hollow portion 18A disposed away from a
hollow portion 19A by a distance gradually increasing from the
upper surface of the protruding portion toward the sole
surface.
[0084] It is desirable that the hollow portion 18A and the hollow
portion 19A have a distance therebetween, at the top end thereof,
being same as the width W1 mentioned above. Further, at the bottom
end, it is desirable that the distance between the hollow portion
18A and the hollow portion 19A is equal to or less than 1.2 times,
especially equal to or less than 1.1 times, of the distance between
the hollow portion 18A and the hollow portion 19A at the top end
thereof. Other configurations of the iron head 10A are same as the
first embodiment, and same reference numerals denote same
components.
Third Embodiment
[0085] In the first and second embodiments, the hollow portions 18,
19, 18A, and 19A have a width E, which is the thickness thereof in
the vertical direction to the face surface. The width E is
substantially same from the top end to the bottom end of the hollow
portions 18, 19, 18A, and 19A. As shown in FIG. 9, in an iron head
10B according to the third embodiment, each of hollow portions 18B
(not shown) and 19B has a thickness gradually increasing from the
top end of the hollow portions toward the bottom end thereof.
Further, the hollow portions 18B and 19B have a thickness, at the
upper end thereof, being same as the width E in the first and
second embodiments. It is desirable that the thickness of the
bottom end of the hollow portions 18B and 19B is equal to or less
than twice, especially equal to or less than 1.2 times, of that of
the upper end thereof. Other configurations of the third embodiment
are same as the first embodiment, and same reference numerals
denote same components.
Fourth Embodiment
[0086] In the first and second embodiment, the hollow portions 18,
19, 18A, and 19A extend from the upper surface 16b of the
protruding portion to the sole surface 14 in a parallel direction
to the striking face 11. The distance between the hollow portions
and the striking face 11, i.e., the thickness of the face plate, is
substantially same from the top to the bottom thereof. As shown in
FIG. 10, according to the fourth embodiment, an iron head 10C has a
thickness of a face plate between hollow portions 18C (not shown)
and 19C and the striking face 11 being gradually increasing from
the top to the bottom thereof. Other configurations of the fourth
embodiment are same as the first embodiment, and same reference
numerals denote same components.
[0087] Further, in the first to fourth embodiments described above,
the hollow portions 18, 19, 18A, 19A, 18B, 19B, 18C, and 19C are
opened to the cavity portion 16, and lids (not shown) may be fixed
to the upper ends of the hollow portions. A same type of the lid
may be used as those in other embodiments described later.
[0088] In the first to fourth embodiments described above, each of
hollow portions penetrates from the cavity portion 16 to the sole
surface, but the hollow portions may be made of holes starting from
the cavity portion 16 toward the sole surface but not reaching it.
Lids may be fixed at openings of the hollow portions opened to the
cavity portion 16. Further, the hollow portions may be made of
holes starting from the sole surface toward the cavity portion 16
but not reaching it. In this case, a bottom lid, as described in
the first to fourth embodiments, is fixed to the entrance opened at
the sole surface.
Fifth Embodiment
[0089] As shown in FIGS. 11 and 12, according to the fifth
embodiment, in the iron head in the first embodiment, an iron head
10D is provided with shock absorbers 21 and 22 inserted into the
hollow portions 18 and 19, and lids 23 and 24 fixed at the upper
ends of the hollow portions 18 and 19. It is desirable that the
shock absorbers 21 and 22 are made of an elastic material such as a
rubber, an elastomer, and a foam made of those.
[0090] Further, it is desirable that the lids 23 and 24 are made of
a metal, a synthetic resin, or an elastomer harder than the shock
absorber. The lids 23 and 24 are fixed to the top end of the hollow
portions 18 and 19 by welding, caulking, shrink fitting, cooling
fitting, and bonding.
[0091] As shown in FIG. 13A, in the embodiment, the shock absorbers
21 and 22 have a wedge shape cross section having a thickness
gradually increasing toward the bottom. As shown in FIG. 13B, the
shock absorbers 21 and 22 are pushed from the sole side into the
hollow portions 18 and 19, and after that, the bottom lid 20 is
fixed into a recess portion 20a disposed in the sole surface. The
upper lids 23 and 24 may be installed in the upper part of the
hollow portions 18 and 19 either before or after the shock
absorbers 21 and 22 are pushed into the hollow portions 18 and
19.
[0092] Before pushing the shock absorbers 21 and 22 into the hollow
portions 18 and 19, an adhesive may be added to at least one of the
inside wall of the hollow portions 18 and 19 or the outside wall of
the shock absorbers 21 and 22.
[0093] Other configurations in FIGS. 11 to 13 are same as the first
embodiment, and the same reference numerals denote same
components.
[0094] Further, the hollow portions may be filled with shock
absorbers which are made into a certain shape beforehand. Instead,
a material having liquidity may be poured into the hollow portions
and hardened to form a shock absorbent. Such materials to be used
are, for example, unvulcanized or low vulcanization rubber, and an
elastomer. Also, the lids may be formed by pouring a material
having liquidity, such as an unvulcanized or low vulcanization
rubber, or an elastomer, into the hollow portions and hardening the
material instead of installing lids which are made into a certain
shape beforehand. Moreover, the upper end of the hollow portion may
be closed by hard materials capable of working as a lid, such as a
rubber, an elastomer or a synthetic resinous material, for example,
transparent acrylic acid resin. The lower part of the hollow
portions may be filled with material with less hardness, such as a
rubber or an elastomer. Materials with high viscosity, such as,
butyl rubber and brominated butyl rubber, may be used as a shock
absorber.
Sixth Embodiment
[0095] In the fifth embodiment, the lids 23 and 24 are fitted into
inside of the upper part of the hollow portions 18 and 19. As shown
in FIG. 14 according to the sixth embodiment, an iron head 10E may
be provided with recess portions 18E (not shown) and 19E being
larger than the hollow portions 18 and 19 and disposed at the upper
surface 16b of the protruding portion. The recess portions 18E and
19E face the hollow portions 18 and 19, and lids 23E (not shown)
and 24E may be fixed into the recess portions 18E and 19E. Other
configurations are the same as the first embodiment, and the same
reference numerals denote the same components.
Seventh Embodiment
[0096] In the fifth and the sixth embodiments, the lids are
attached to the upper end of the hollow portions from above. As
shown in FIGS. 15 and 16, in an iron head 10F according to the
seventh embodiment, lids 23F (not shown) and 24F are attached from
below the hollow portions 18 and 19. The upper ends of the hollow
portions 18 and 19 are connected to the cavity portion 16 through
small holes 18F (not shown) and 19F. A lid 24F is provided with a
board-shaped main part 24a and a projection portion 24b projecting
from the top surface thereof. The projection portion 24b is
inserted into the small hole 19F. Although it is not shown, the lid
23F, to be attached to the hollow portion 18, has the same
constitution. Other configurations in FIGS. 15 and 16 are same as
in the first embodiment, and same reference numerals denote same
components.
Eighth Embodiment
[0097] As shown in FIG. 17, according to an eighth embodiment, in
the iron head 10B in FIG. 9, an iron head 10G is provided with
shock absorbers 21G (not shown) and 22G inserted into the hollow
portions 18B (not shown) and 19B respectively. Further, the iron
head 10G is provided with lids 23G (not shown) and 24G at the upper
ends of the hollow portions 18B (not shown) and 19B. The upper
surface 16b of the protruding portion is provided with recess
portions (not shown) similar to the hollow portions 18E (not shown)
and 19E shown in FIG. 14. The lids 23G and 24G are fitted and fixed
into the recess portions. Other configurations in FIG. 17 are same
as the embodiment shown in FIG. 9, and the same reference numerals
denote same components.
Ninth Embodiment
[0098] As shown in FIG. 18, according to the ninth embodiment, an
iron head 10H is provided with lids 23H (not shown) and 24H,
instead of the lids 23G and 24G in the iron head 10G shown in FIG.
17. The lids 23H and 24H have a substantially same shape as that of
the lid 24F shown in FIGS. 15 and 16. Similar to FIGS. 15 and 16,
the small holes 18F (not shown) and 19F are provided at the upper
end of the hollow portions 18B (not shown) and 19B. The projection
portions disposed on the lids 23H and 24H are inserted into the
small holes 18F and 19F. Other configurations in FIG. 18 are same
as the embodiment shown in FIG. 9, and same reference numerals
denote same components.
Tenth Embodiment
[0099] As shown in FIG. 19, according to a tenth embodiment, in the
iron head 10 shown in FIGS. 1 to 6, similar to FIGS. 11 to 13, an
iron head 10I includes shock absorbers 21I (not shown) and 22I
inserted into the hollow portions 18 (not shown in FIGS. 19) and
19, respectively. Unlike the iron head 10D in FIGS. 11 to 13, the
lid 23 is not installed at the upper end of the hollow portions 18
and 19. The upper surfaces of shock absorbers 21I and 22I are
exposed to the cavity portion 16 and leveled with the upper surface
16b of the protruding portion. Other configurations are same as the
first embodiment, and same reference numerals denote same
components.
Eleventh Embodiment
[0100] As shown in FIG. 20, according to an eleventh embodiment, in
the iron head 10C in FIG. 10, an iron head 10J is provided with the
shock absorbers 21J (not shown) and 22J inserted into the hollow
portions 18C (not shown) and 19C, respectively. No lid is installed
at the upper end of the hollow portions 18C and the 19C, and the
upper surface of the shock absorbers 21J and 22J are leveled with
the upper surface 16b of the protruding portion. Other
configurations are same as the embodiment shown in FIG. 10, and
same reference numerals denote same components.
Twelfth Embodiment
[0101] As shown in FIG. 21, according to a twelfth embodiment, in
the iron head 10B in FIG. 9, an iron head 10K is provided with
shock absorbers 21K (not shown) and 22K inserted into the hollow
portions 18B (not shown) and 19B. No lid is installed at the upper
end of the hollow portions 18B and 19B, and the upper surface of
the shock absorbers 21K and 22K is leveled with the upper surface
16b of the protruding portion. Other configurations are same as the
embodiment shown in FIG. 10, and same reference numerals denote
same components.
Thirteenth Embodiment
[0102] As shown in FIGS. 22 and 23, according to a thirteenth
embodiment, instead of the bottom lid 20 in the iron head 10I in
FIG. 19, an iron head 10L is provided with a bottom lid 20L having
a wedge-shaped projection portion 20t. Further, instead of the
shock absorber 22I, the iron head 10L is provided with a shock
absorber 22L having a V-shaped ditch 22h at the bottom surface
thereof. The shock absorber 22L is inserted into the hollow portion
19 from above. A width of the ditch 22h is smaller than a thickness
of the wedge-shaped projection portion 20t.
[0103] When the shock absorber 22L is pushed into the hollow
portion 19 from above, the projection portion 20t is pushed into
the ditch 22h. Then, the bottom end of shock absorber 22L is
extended by a force and pushed to the inside wall of the hollow
portion 19 whose lower side is wider than the upper part thereof.
Therefore, the shock absorber 22L is prevented from falling out
from the hollow portion 19.
[0104] Although it is not shown, the bottom lid 20L is also
provided with a projection portion, similar to the projection
portion 20t, disposed at a point facing the hollow portion 18.
Further, the shock absorber inserted into the hollow portion 18 is
provided with a ditch, similar to the ditch 22h, disposed at the
bottom surface of thereof. The projection portion and the ditch
make it possible to prevent the shock absorber from falling out
from the hollow portion 18.
Fourteenth Embodiment
[0105] As shown in FIGS. 24 and 25, according to a fourteenth
embodiment, an iron head 10M is provided with hollow portions 18M
(not shown) and 19M extending from the upper surface 16b of the
protruding portion toward the sole surface 14 but not reaching it.
The hollow portions 18M and 19M are filled with shock absorbers 21M
(not shown) and 22M. A shape and a size of the hollow portions 18M
and 19M are substantially same as those of the hollow portions 18
and 19 in the first embodiment. No lid is installed at the upper
end of the hollow portions 18M and 19M, and the shock absorbers 21M
and 22M has an upper surface being leveled with the upper surface
16b of the protruding portion.
[0106] When the shock absorbers 21M and 22M are pushed into the
hollow portions 18M and 19M, the shock absorbers 21M and 22M are
fixed to the inside of the hollow portions 18M and 19M by adhesives
added onto the outside wall of the shock absorbers 21M and 22M or
the inside wall of the hollow portions 18M and 19M, in order to
prevent the shock absorbers 21M and 22M from falling out from the
hollow portions 18M and 19M.
[0107] The shock absorbers 21M and 22M have a rounded edge at the
bottom end thereof. This is to prevent the edge of the shock
absorbers 21M and 22M from being pushed to the corner of the hollow
portions 18M and 19M and creating a strong stress at a certain
limited area.
Fifteenth Embodiment
[0108] As shown in FIGS. 26 to 28, according to the fifteenth
embodiment, in the iron head 10D in the fifth embodiment, an iron
head 10N is provided with a recess portion 25a extending from the
hollow portion 18 to the hollow portion 19 at the upper surface 16b
of the protruding portion. Further, a lid 25 is installed into the
recess portion 25a and fixed by welding, caulking, shrink fitting,
cooling fitting, and bonding. The lid 25 has an upper surface being
leveled with the upper surface 16b of the protruding portion. Other
configurations are same as in the fifth embodiment, and same
reference numerals denote same components.
Sixteenth Embodiment
[0109] FIGS. 29 to 33 show an iron head 10P according to a
sixteenth embodiment. Similar to the iron head 10, the iron head
10P is provided with the striking face 11 for hitting a ball, the
toe side 12, the heel side 13, the sole surface 14, and the hosel
15 for connecting the shaft, the cavity portion 16 disposed at the
upper portion of the backside surface, the protruding portion 17
projecting backward under the cavity portion 16. Further, the iron
head 10P has a hollow portion 40 penetrating from the upper surface
16b of the protruding portion to the sole surface 14, a shock
absorber 50 filled in the hollow portion 40, and a bottom lid 49
disposed at the sole surface for closing the hollow portion 40.
[0110] The hollow portion 40 extends from the proximity of the toe
side 12 to the proximity of the heel side 13. A middle portion 41
of the hollow portion 40 on the sole side in a toe to heel
direction is situated in the backside area of the sweet area of the
striking face 11. The iron head 10P has a plurality of thicknesses
t1, t2, and t3. The thickness t1 is a thickness of the middle
portion 41 in a range between the hollow portion 40 and the
striking face 11, i.e., the thickness of the face plate. The
thickness t2 is a thickness of the face plate at a toe side part
42. The thickness t3 is a thickness of the face plate at a heel
side part 43. The thickness t1 is larger than both a thickness t2
and the thickness t3.
[0111] It is desirable that a length of the hollow portion 40 in a
toe to heel direction is 35 mm to 80 mm, especially 40 mm to 80 mm.
A length of the middle portion 41 in a toe to heel direction is 15
mm to 40 mm, especially 18 mm to 35 mm. At the sole side end, it is
desirable that the thickness t1 of the face plate is equal to or
more than 2.5 mm, especially more than 5.0 mm. Further, it is
desirable that the thickness t2 and the thickness t3 are 2.0 mm to
5.0 mm, especially 2.0 mm to 3.0 mm.
[0112] Around the upper surface 16b of the protruding portion, a
width of the hollow portion 40 in the vertical direction to the
striking face is substantially same as a distance from the toe side
part 42 to the heel side part 43. In other words, at the upper part
of the protruding portion 17, the thickness of the face plate is
substantially same in a toe to heel direction.
[0113] The thicknesses t2 and t3 of the face plate at the toe side
part 42 and the heel side part 43 of the hollow portion 40 are
substantially same as those from the top to the bottom of the
protruding portion 17. Also, the thicknesses t2 and t3 of the face
plate at the lower portion of the protruding portion 17 may be
slightly larger than the thicknesses t2 and t3 of the face plate at
the upper portion of the protruding portion 17.
[0114] At the middle portion 41 of the hollow portion 40, the
thickness t1 of the face plate increases gradually from the top to
the sole side of the protruding portion 17.
[0115] A shock absorber 50 fits perfectly into the hollow portion
40 or has a size and a shape slightly larger than those of the
hollow portion 40. A middle portion 51 of the shock absorber 50 in
a toe to heel direction has a thickness being same as a thickness
from a top to a bottom thereof in a front to back direction or in
the direction to which a ball flies. At a toe side part 52 and a
heel side part 53, a thickness of the shock absorber 50 is smallest
at the top thereof and increases toward the bottom thereof.
[0116] The iron head 10P is provided a recess portion 47 for fixing
the bottom lid 49 at the sole surface thereof. The bottom lid 49 is
fitted and fixed into the recess portion 47. A method for fixing
the bottom lid 49 includes welding, a laser welding for example;
caulking; shrink fitting; and cooling fitting and bonding.
[0117] An upper surface of the shock absorber 50 is exposed to the
cavity portion 16 and is leveled with the upper surface 16b of the
protruding portion. A lid may be installed at the upper surface of
the shock absorber 50.
[0118] According to the sixteenth embodiment, the iron head 10P is
provided with the hollow portion 40 extending from the toe side to
the heel side. With the hollow portion 40 being provided, it is
possible to reduce the weight of the iron head. Therefore, it is
possible to increase a size of the iron head without increasing the
weight thereof. Further, when a weight distribution increases on
the toe side 12 and the heel side 13 of the iron head, it is
possible to increase the sweet area of the iron head without
increasing the weight thereof. The iron head 10P has a plurality of
thicknesses t1, t2, and t3. The thickness t1 is a thickness of a
face plate at the rear side of the middle portion 41. The thickness
t2 is a thickness of the face plate at the toe side 12. The
thickness t3 is a thickness of the face plate at the heel side 13.
Because the thickness t1 is larger than the thicknesses t2 and t3,
the iron head 10P is capable of providing a strong impact feeling
when hitting a ball.
[0119] The iron head 10P has a thickness of the face plate at the
middle portion 41 being substantially same as the thickness of the
face plate at the toe side part 42 and the heel side part 43 above
the protruding portion 17. The thickness of the face plate at the
middle portion 41 may be larger than that of the toe side part 42
and the heel side part 43. The iron head 10P has the hollow portion
40 filled with the shock absorber 50, and the shock absorber 50 may
be omitted.
Seventeenth Embodiment
[0120] FIGS. 34 and 35 show an iron head 10Q according to a
seventeenth embodiment. FIG. 34 is a front view of the iron head
10Q according to the seventeenth embodiment. As shown in FIG. 34,
the iron head 10Q is provided with a plurality of score lines
formed on the face plate 11 thereof. The score lines consist of a
plurality of lines extending in parallel with a certain distance
therebetween equal to or more than 3 mm. A longest score line 60 is
located near the sole surface 14.
[0121] FIG. 35 is a sectional view of the iron head 10Q according
to the seventeenth embodiment. The iron head 10Q is provided with
the striking face 11 for hitting a ball, the toe side 12, the heel
side 13, the sole surface 14, and the hosel 15 for connecting the
shaft. Further, the iron head 10Q has the cavity portion 16
disposed at the upper portion of the backside surface, the
protruding portion 17 disposed at the lower portion of the backside
surface and projected backward thereof, the first hollow portion 18
penetrating from the bottom surface 16b of the cavity portion 16 to
the sole surface 14 and disposed at the heel side of the protruding
portion 17, the second hollow portion 19 disposed at the toe side
of the protruding portion 17, and the bottom lid 20 disposed at the
sole surface and closing the first hollow portion 18 and the second
the portion 19.
[0122] The middle portion M between the first hollow portion 18 and
the second hollow portion 19 corresponds to a sweet area located at
the lower central part of the striking face 11. The middle portion
M is not a hollow but made of metal material, which is used to
produce the iron head 10, such as iron and iron basis alloy.
[0123] In the iron head 10Q, the middle portion M is located so
that a centerline C1 (cf. FIG. 35) of the middle part M is aligned
with a centerline C2 (cf. FIG. 34) of the longest score line 60.
With such a configuration provided, it is possible to align the
centerline C1 of the middle portion M with the hitting point
regardless of the distance between the first hollow portion 18 and
the second hollow portion 19.
* * * * *