Source: https://patents.google.com/patent/DE60120349T2/en
Timestamp: 2020-02-17 20:17:08
Document Index: 525778527

Matched Legal Cases: ['art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20']

DE60120349T2 - Iron pool rack and golf rack set - Google Patents
Iron pool rack and golf rack set
DE60120349T2
DE60120349T2 DE60120349T DE60120349T DE60120349T2 DE 60120349 T2 DE60120349 T2 DE 60120349T2 DE 60120349 T DE60120349 T DE 60120349T DE 60120349 T DE60120349 T DE 60120349T DE 60120349 T2 DE60120349 T2 DE 60120349T2
DE60120349T
DE60120349D1 (en
MIZUNO CORPORATION Kiyotaka Osaka-shi CHAEN
MIZUNO CORPORATION Mototaka Osaka-shi IWATA
MIZUNO CORPORATION Mamoru Osaka-shi SARAIE
MIZUNO CORPORATION Isamu Osaka-shi TOSHINARI
MIZUNO CORPORATION Tomomi Osaka-shi WATANABE
2000-10-16 Priority to JP2000314678 priority Critical
2000-10-16 Priority to JP2000314678 priority
2001-08-01 Application filed by Mizuno Corp filed Critical Mizuno Corp
2001-08-01 Priority to PCT/JP2001/006636 priority patent/WO2002032514A1/en
2006-07-20 Publication of DE60120349D1 publication Critical patent/DE60120349D1/en
2007-05-31 Publication of DE60120349T2 publication Critical patent/DE60120349T2/en
The The present invention relates to an iron golf club (im hereinafter simply referred to as "cavity iron"), the a cavity portion on the back surface side of the front portion and a golf club set; and more particularly to a cavity iron golf club mounted on a surface of a Sole section that limits the cavity section, with a Groove is provided for adjusting a thickness of the front section, while an effective front length is enlarged, and on a golf club set with such a golf club.
traditionally, is a cavity iron golf club known in which a sole portion in an undercut Form is designed to achieve a weight reduction and the center of gravity to the back the clubface to arrange, i. to deepen the focus. This kind of Iron golf club head is, for example, in Japanese Utility Model Laid-Open No. 5-27951.
23 Fig. 15 is a cross-sectional view of an iron golf club head disclosed in Japanese Utility Model Laid-Open No. 5-27951.
As in 23 shown contains a head section 1 a cavity section 2 , a clubface section 3 with a ball impact surface, and a sole portion 4 , An undercut surface 5 is formed by chamfering the surface of the sole portion 4 that the cavity section 2 limited. By forming the undercut surface 5 For example, the center of gravity depth can be increased while decreasing the weight of the head section 1 is achieved. In the above document, however, the thickness of the face portion becomes 3 not mentioned, and the thickness of the clubface section 3 is like in 23 shown uniform.
The cavity iron of in 23 The type shown has an excellent directivity of the beaten ball, but it also has the problem that an improvement in the range can not be achieved.
Because the thickness of the clubface section 3 was uniform, had the cavity iron of 23 in addition, the problem of a considerable reduction in the range in the case of a staggered hit, in which a golf ball is hit with a location other than the sweet spot.
US 5,971,868 discloses a golf club head having a head portion including a face portion, a cavity portion, and a sole portion. A groove extending along the face portion is provided on a surface on the cavity side of the sole portion.
A Thickness of the face section increases in steps from the top to the bottom of the clubface section, while from a central portion of the clubface section to both Tip portion as well as to a neck portion of the head portion decreases.
The The present invention has been made to solve the above problems to solve. The object of the present invention is, in a Hohlraumeisengolfschläger the Depth of focus of a golf club head to enlarge, that moment of inertia increase in the top-neck direction, and the directivity of the to improve hit balls while too big a reduction the range is reduced in a staggered stroke.
The Task is solved by an iron golf club according to claim 1. Further developments of the invention are specified in the dependent claims, respectively.
By providing the groove on the surface of the sole portion on the side of the cavity portion as described above, an effective face length can be increased. Here, the effective clubface length refers to a length of a portion of the clubface portion that can flex when hitting a ball, and is a length in the direction from the soleportion to the top edge portion. By extending the effective clubface length, the clubface decreases cut more flexible, and thus the return property of the face portion can be improved. By making the thickness of the ball-striking portion in the face portion larger than the thickness of the top edge-side portion and the thickness of the sole-side portion of the face portion, the face portion becomes even more flexible, and the returning property of the face portion can be effectively improved. By providing the groove, the center of gravity depth of the golf club head is further increased, so that the moment of inertia can be increased and the directivity of the hit ball can be improved.
The Thickness of the ball impact section is made larger than a thickness a tip side portion of the face portion that intervenes a tip portion of the head portion and the ball impact portion is arranged, and greater than a thickness of a neck-side portion of the face portion which between a neck portion of the head portion and the ball impact portion is arranged. Also in this case, the clubface section made more flexible and the default property of the clubface section be improved. additionally Forming by forging is preferable to the thickness being low to do while the strenght in the tip-side portion and the neck-side portion is maintained.
Of the tip-sided section contains a first region disposed on the side of the top edge portion is, and a second area on the side of the sole section is disposed, and the neck-side portion includes a third area, which is arranged on the side of the top edge section is and a fourth area on the side of the sole section is arranged. In this case, a thickness of the first area preferably made smaller than a thickness of the second region, and a thickness of the third region is preferably made smaller as a thickness of the fourth region. Thus, the clubface section can be made even more flexible, and the return property of the face section can be improved.
Preferably is the height a base area the groove of a base of the sole portion from on the side of the neck portion lower made as on the side of the top section.
Usually is the height the clubface of iron golf club head on the side of the top section made higher and on the side the neck section made smaller. By making the height of the footprint of the Groove from the base of the sole portion from on the side of the neck portion lower as well as on the side of the top section, the effective clubface length can also be made larger on the side of the neck section. As a result, can the effective clubface lengths the side of the top section and on the side of the neck section be made equal so that the default property then too can be improved if a ball in the case of a staggered Beat on the side of the top section or on the side of the Neck is beaten.
Of the Contains sole section a projecting wall portion having a side wall of the groove forms and along the face portion to the upper edge portion ascends. This projecting wall section has, for example a trapezoidal shape.
As As described above, by providing the projecting wall portion behind the clubface section the depth of focus is increased, and the directivity of the beaten ball can be improved.
One Through hole is provided in the sole portion so that it from a base reaches the sole region of the cavity area, and the groove may be provided by attaching a blocking element, the one end portion in the through hole on one side of the Floor space of the sole section closes. Thus, a deep groove can be formed in the sole portion along the face portion and the effective face length can be increased.
The specific weight of a material containing the blocking element is preferably made larger as the specific gravity of a material which is a body of the body Head section forms. So can the center of gravity of the golf club head be lowered.
A rear portion located behind the striking surface portion in the head portion may be formed by a back member which is a member different from the body of the head portion. In this case, the groove is provided between the body of the head portion and the back portion by attaching the back portion to the body of the head portion. By executing the back section of the head portion as a separate member from the body of the head portion, a deep groove can be formed in the sole portion along the face portion, and the effective face length can be increased as in the case where the through hole is provided as described above.
The specific weight of a material forming the back part, is preferably made larger as a specific weight of a material containing the body of the body Head section forms. So can the center of gravity of the golf club head to be enlarged while the center of gravity is lowered.
In contains an aspect a golf club set according to the present Invention a long iron golf club (e.g., iron golf club no. 1 to No. 4), a medium iron golf club (e.g., iron golf club no. 5 to No. 7) and a short iron golf club (e.g., iron golf club no. 8 to sandwedge). The long iron golf club, the medium iron golf club and the short iron golf club are all provided with a head section having a cavity section, a clubface section and a sole portion and provided with a groove, extending along the clubface section on a surface of the sole portion extends on the side of the cavity portion. The depth of the groove in a central portion of the face portion of the long iron golf club is bigger than the depth of the groove in a central portion of the face portion the medium iron golf club, and the depth of the groove in the central portion of the face portion medium iron golf club is bigger than the depth of the groove in a central portion of the face portion the short iron golf club.
By gradually Enlarge the Depth of the groove provided in the sole portion as described above from a short iron golf club to a long iron golf club Hinkann a bigger increase the effective clubface length and thus a higher one Restoring property to the long iron golf club be provided, which requires a long flight is, and a golf club set, whose Focus on improved flight distance can be provided become.
In another aspect of the golf club set according to the present invention Invention is a groove extending along the face portion extends, on a surface of the sole portion on the side of the cavity portion of the long Iron golf club and the medium iron golf club provided, and the depth of the groove in a central portion of the Face portion of the long iron golf club is made bigger as the depth of the groove in a central portion of the face portion the medium iron golf club, while the groove extending along the face portion a surface the sole portion of the short iron golf club on the side of the cavity not provided. In this case, too, the same effects can be how to achieve the one aspect described above.
1 FIG. 12 is an illustration of a head portion of an iron golf club according to the present invention as viewed from a back surface side of a striking surface. FIG.
2 Fig. 12 is an illustration of the head portion of the iron golf club according to the present invention as viewed from a front surface side.
3 is a cross-sectional view taken along a line III-III in 1 ,
4 is a cross-sectional view taken along a line IV-IV in FIG 1 ,
5 is a cross-sectional view taken along a line VV in FIG 1 ,
6 is a cross-sectional view along a line VI-VI in 1 ,
7 is a cross-sectional view of another embodiment along the line III-III in 1 ,
8th is a cross-sectional view of another embodiment along the line IV-IV in FIG 1 ,
9 is a cross-sectional view of another embodiment along the line VV in FIG 1 ,
10 is a cross-sectional view of another embodiment along the line VI-VI in 1 ,
11 Fig. 11 is a rear view of a head portion of a cavity iron golf club of another example of the present invention.
12 is a cross-sectional view along a line XII-XII in 11 ,
13 FIG. 12 is a cross-sectional view of a modification of FIG 11 shown example along the line XII-XII.
14 to 16 FIG. 15 are cross-sectional views each showing a first to third step of the manufacturing steps for a head portion of an embodiment of FIG 13 show iron golf club shown.
17 FIG. 12 is a cross-sectional view of a modification of FIG 13 shown head section.
18 Fig. 11 is a rear view of a head portion of a cavity iron golf club according to another example of the present invention.
19 is a cross-sectional view taken along a line XIX-XIX in 18 ,
20 is one with a description of a method of making an in 18 shown portion of the head section.
21A Fig. 10 is a rear view of a head portion of a short iron golf club according to the present invention.
21A Fig. 11 is a rear view of a head portion of a long iron golf club according to the present invention.
22A to 22C are respectively cross-sectional views of head portions in a long iron golf club, a medium iron golf club and a short iron golf club.
23 Fig. 10 is a cross-sectional view of a head portion in a conventional cavity iron.
The embodiments of the present invention will now be described with reference to FIG 1 to 21 described. 1 is a rear view of a head section 1 of an iron golf club No. 5 (medium iron golf club) according to the present invention as viewed from a back surface side of a clubface. 2 is a front view of the head section 1 seen from a front surface side (Ballschlagflächenseite). A shaft and a handle are in 1 and 2 not shown.
As in 1 and 2 illustrated is the head portion with a cavity portion 2 , a clubface section 3 , a sole section 4 , a groove 6 , a top edge section 7 , a top section 8th a neck section 9 and a projecting wall portion 16 Mistake.
The head section 1 For example, it can be formed by forging and machining a mild steel element. The cavity section 2 is on a back surface side of the clubface section 3 provided. By providing the cavity portion 2 can the head section 1 be made lighter in weight.
As in 2 shown contains the clubface section 3 a ball-striking section 11 , a top edge side section 12 , a sole-side section 13 , a tip-side section 14 and a neck-side section 15 ,
The ball striking section 11 is a high-return section (eg, with a return coefficient of 0.9 or more) that is primarily expected to hit a ball and contains a sweetspot 10 and its surrounding area.
It Now, a method for measuring the return coefficient will be described.
First, the face of an iron golf club becomes perpendicular to the ground and to a gulf held ball, with which she performs a push. The golf ball is caused to hit in the middle of a score line of the golf club or in the place of its sweet spot, and a ball speed Vin before impact (Vin = 44 ± 0.5 m / s in the present test method) and a ball speed Vout after the impact is measured using a speedometer with an optical sensor. Using the measured Vin and Vout and the following formula (1), a return coefficient COR is calculated. Vout / Vin = (COR · M - m) / (M + m) (1)
there M is the mass of the iron head, and m is the mass of the golf ball. The golf ball is Pinnacle Gold LS, used commercially by Akushinet Company available is. Average weight of the golf ball is 45.4 ± 0.4 g, and while of the test will be the golf balls stored in a room maintained at 23 ± 1 ° C.
The thickness of the clubface section 3 at the ball impact section 11 is for example 3.7 mm.
An upper edge-side section 12 is between the ball impact section 11 and the top edge section 7 arranged. The thickness of the clubface section 3 in the top edge side section 12 is for example 3 mm. Thus, the thickness of the ball impact section 11 greater than the thickness of the top edge side section 12 ,
A sole-side section 13 is between the ball impact section 11 and the sole section 4 arranged. The thickness of the clubface section 3 in the sole side section 13 is for example 3.1 mm. Thus, the thickness of the ball impact section 11 greater than the thickness of the sole side portion 13 ,
By performing the thickness of the ball impact section 11 greater than the thickness of the top edge side section 12 and the thickness of the sole side portion 13 As described above, the face portion 3 be made flexible, and the return feature of the club section 3 can be improved.
A lace-sided section 14 is between the Ballabschlagschnitt 11 and the top section 8th arranged. The thickness of the clubface section 3 in the tip-side section 14 is for example 2.5 to 3.0 mm. The tip-side section 14 contains a first area that is on the side of the top edge section 7 is arranged, and a second area on the side of the sole portion 4 is arranged. The thickness of the first region is 2.5 mm, for example, and the thickness of the second region is 3.0 mm, for example.
A neck-side section 15 is between the ball impact section 11 and the neck section 9 arranged. The thickness of the clubface section 3 in the neck-side section 15 is for example 2.5 to 3.0 mm. The neck-side section 15 contains a third area on the side of the top edge section 7 is arranged, and a fourth area on the side of the sole portion 4 is arranged. The thickness of the third region is 2.5 mm, for example, and the thickness of the fourth region is 3.0 mm, for example.
By performing the thickness of the ball impact section 11 greater than the thickness of the tip-side portion 14 and the thickness of the neck-side portion 15 As described above, the face portion 3 be made even more flexible. This can also effectively improve the return property of the clubface section 3 contribute.
The sole section 4 points as in 1 shown a groove 6 on. 3 to 6 show respectively cross-sectional views along a line III-III, a line IV-IV, a line VV and a line VI-VI of the in 1 shown head section.
The groove 6 can be formed by machining (cutting) a surface of the sole portion 4 on the side of the cavity section 2 , For example, the cutting edge angle for machining with respect to the impact surface is set to, for example, 5 to 6 degrees, and cutting is performed from a surface of the sole portion 4 along an in 3 shown line CC performed to the groove 6 to form with a width of about 6 mm.
The groove 6 extends as in 1 shown in a direction from the tip section 8th to the neck section 9 , and a footprint of the groove 6 is on the side of the neck section 9 closer to a reason surface of the sole section 4 as on the side of the top section 8th , Thus, a height H is from a contact point of the sole portion 4 with the ground when placing the iron golf club up to a base of the groove 6 on the side of the neck section 9 less than on the side of the tip section 8th , and a minimum height H1 of the groove base is from a surface center portion in the direction of the tip portion 8th to the neck section 9 out to the side of the neck section 9 arranged.
The height H of the base of the groove 6 changes in the direction of the tip section 8th to the neck section 9 , In the cross section of 3 is the height of the base of the groove 6 11 mm, and a depth D of the groove 6 is about 8 mm. In the cross section of 4 is the height of the base of the groove 6 13 mm, and the depth D of the groove 6 is about 7 mm. In the cross section of 5 is the height H of the base of the groove 6 13.5 mm, and the depth D of the groove 6 is about 6.5 mm. In the cross section of 6 is the height H of the base of the groove 6 16 mm, and the depth D of the groove 6 is about 1 mm. Thus, the depth D of the groove 6 on the side of the neck section 9 larger than on the side of the top section 8th ,
By providing the groove 6 As described above, the effective face lengths L1 to L4 can be as in FIG 3 to 6 shown enlarged.
In particular, an effective face length L1 is on the side of the neck portion 9 For example, 24 mm, an effective face length L2 in the face portion center portion is 27 mm, for example, an effective face length L3 is 31 mm, and an effective face length L4 on the tip portion side is 32 mm, for example.
In this way, the effective area lengths L1 to L4 can be increased so that the striking surface section 3 can be made even more flexible and the return property of the club section 3 can be improved.
As in 3 and the following, forms a projecting wall portion 16 one of the side walls of the trench 6 and rises along the clubface section 3 to the top edge section 7 towards. The projecting wall section 16 has like in 1 represented a trapezoidal shape.
In addition, another embodiment of an iron golf club No. 5 will be described with reference to FIG 1 . 2 and 7 to 10 described ben. The thickness of the clubface section 3 in a ball-striking section 11 This iron golf club is 4.3 mm, for example.
An upper edge-side section 12 is between the ball impact section 11 and a top edge section 1 arranged. The thickness of the clubface section 3 in the top edge side section 12 is for example 3.3 mm. Thus, the thickness of the ball impact section 11 greater than the thickness of the top edge side section 12 ,
A sole-side section 13 is between the ball impact section 11 and a sole section 4 arranged. The thickness of the clubface section 3 in the sole side section 13 is for example 4.3 mm. Thus, the thickness of the ball-striking portion is the same as the thickness of the sole-side portion 13 ,
By performing the thickness of the ball impact section 11 greater than the thickness of the top edge side section 12 As described above, the face portion 3 be made more flexible and the return feature of the clubface section 3 can be improved.
A lace-sided section 14 is between the ball impact section 11 and a top section 8th arranged. The thickness of the clubface section 3 in the tip-side section 14 is for example 2.8 to 3.3 mm. The tip-side section 14 contains a first area that is on the side of the top edge section 7 is arranged, and a second area on the side of the sole portion 4 is arranged. The thickness of the first region is, for example, 2.8 mm, and the thickness of the second region is, for example, 3.3 mm.
A neck-side section 15 is between the ball impact section 11 and the neck section 9 arranged. The thickness of the clubface section 3 in the neck-side section 15 is for example 2.8 to 3.3 mm. The neck-side section 15 includes a third area located on the side of the top edge portion and a fourth area on the side of the sole portion 4 is arranged. The thickness of the third region is, for example, 2.8 mm, and the thickness of the fourth region is, for example, 3.3 mm.
The sole section 4 points as in 1 shown a groove 6 on. 7 to 10 show respectively cross-sectional views along a line III-III, a line IV-IV, a line VV and a line VI-VI of the in 1 shown head section.
The groove 6 can by machining (cutting) a surface of the sole portion on the side of the cavity portion 4 be formed. According to this embodiment, the cutting edge angle for machining is set to 0 degrees relative to the face surface, so that the groove 6 is parallel to the face surface, and the cutting is from a surface of the sole portion 4 out along an in 7 shown line CC-CC performed to the groove 6 to form with a width of about 6 mm.
The groove 6 extends as in 1 shown in a direction from the tip section 8th to the neck section 9 , and a footprint of the groove 6 is on the side of the neck section 9 closer to a base of the sole portion 4 as on the side of the top section 8th , Thus, a height H is from a contact point of the sole portion 4 with the ground when placing the iron golf club up to a base of the groove 6 on the side of the neck section 9 less than on the side of the tip section 8th , and a minimum height H1 of the groove base is from a surface center portion in the direction of the tip portion 8th to the neck section 9 out to the side of the neck section 9 arranged.
The height H of the base of the groove 6 changes in the direction of the tip section 8th to the neck section 9 , In the cross section of 7 is the height of the base of the groove 6 11 mm, and a depth D of the groove 6 is about 8 mm. In the cross section of 8th is the height of the base of the groove 6 13 mm, and the depth D of the groove 6 is about 7 mm. In the cross section of 9 is the height H of the base of the groove 6 13.5 mm, and the depth D of the groove 6 is about 6.5 mm. In the cross section of 10 is the height H of the base of the groove 6 16 mm, and the depth D of the groove 6 is about 1 mm. Thus, the depth D of the groove 6 on the side of the neck section 9 larger than on the side of the top section 8th ,
By providing the groove 6 As described above, the effective face lengths L5 to L8 as in FIG 7 to 10 shown enlarged.
In particular, an effective face length L5 is on the side of the neck portion 9 for example, 24 mm, an effective face length L6 in the face portion center portion is 27 mm, for example, an effective face length L7 is 31 mm, and an effective face length L8 on the tip portion side is 32 mm, for example.
In this way, the effective face lengths L5 to L8 can be increased so that the face portion 3 can be made even more flexible and the return property of the club section 3 can be improved.
As in 7 and the following illustrates the projecting wall portion 16 one of the side walls of the groove 7 and rises along the clubface section 3 to the top edge section 7 towards. The projecting wall section 16 has like in 1 shown a trapezoidal shape.
As in the embodiment described above, by providing the projecting wall portion 16 behind the clubface section 3 the centroid depth of the head section 1 can be increased, and the directivity of the beaten ball can be improved.
It Now the measured results of the return coefficient, the centroid depth and the moment of inertia in the tip-and-neck direction of each of the above-described embodiments the present invention and a conventional Hohlraumeisengolfschlägers in Table 1 shown.
As As shown above, the product according to the invention has a higher return coefficient as well as a greater depth of gravity and a larger moment of inertia in the top-neck direction as the conventional one Product. Thus, the product of the invention can be improved Directivity of the ball slaughtered and an improved reset property deliver.
Now, with respect to 11 to 16 another example of a Hohlraumeisengolfschlägers according to the present invention described.
11 is a rear view of a head section 1 a Hohlraumeisengolfschlägers no. 5 of a further example according to the present invention, and 12 and 13 are cross-sectional views taken along a line XII-XII in FIG 11 ,
As in 12 and 13 is shown in this example, a through hole, which is a base of a sole portion 4 reached from a cavity portion in the sole portion 4 formed, and a tungsten plate (blocking element) 19 is in an end portion in the through hole on the side surface of the sole portion 4 press fitted and fixed, creating a groove (undercut section) 6 on the back of a club section 3 is formed. A base of the groove 6 is through the tungsten plate 19 educated.
While. this in 12 An example shown is one in which the through-hole is inclined with respect to a ball-striking surface of the face portion 3 is educated, is an in 13 shown example of one in which the through hole parallel to the ball striking surface of the face portion 3 is trained. In addition, a relationship between a thickness of a ball impact portion in the face portion 3 and a thickness in a region other than the ball impact portion in the face portion 3 as they are in 12 and 13 are shown the same as those in the in 1 and the following cases described above.
By forming a through-hole as described above and forming the groove 6 by fitting the tungsten plate 19 in the sole section 4 For example, a depth D of the trench can be made larger than in the example described above. In particular, the depth of the groove 6 to approximately 9 mm (neck section) to 15 mm (tip section).
Here, a height H from a contact point of the sole portion 4 with the ground when putting an iron golf club to a base of the groove 6 about 3 mm (neck portion) to 4 mm (tip portion), and an effective face length L9 becomes about 26 mm (neck portion) to 38 mm (tip portion).
Thus, the effective face length L9 can be made larger than in the above-described example, the face portion 3 can be made even more flexible, and the return property of the clubface section 3 can be improved.
In addition, the distribution of the depth D of the trench 6 from the top section 8th to the neck section 9 are made similar to those of the embodiments described above. By fitting an element with a high specific gravity such as the tungsten plate described above 19 in the sole section 4 can the center of gravity of the head section 1 be lowered. Instead of the tungsten plate 19 may be another element than the tungsten plate 19 may be used as long as it is made of a material having a specific gravity greater than that of the material of the body of the head portion 1 ,
In the following, a manufacturing method of the in 13 shown example with reference to 14 to 16 described.
As in 14 is shown by machining using a Kugelendfräsers 17 a through hole 23 with a predetermined length in a sole portion 4 educated. The through hole 23 is a slit or a longitudinal hole coming from the cavity section 2 out along the clubface section 3 a base of the sole portion 4 reached and that from the top section 8th out to the neck section 9 of the head section 1 extends.
Then it will be like in 15 shown a step section 24 formed by cutting the base of the sole portion 4 around the through hole 23 around using a finish router 18 , The tungsten plate 19 will be like in 16 shown on the step section 24 press-fit. Thus, the end portion of the base surface side of the sole portion 4 in the through hole 23 through the tungsten plate 19 be blocked while the groove 6 on the back of the head section 1 can be formed.
Now, using 17 a modification of the in 13 described section described.
In this modification is the shape of a tungsten plate 19 , as in 17 shown by that of 13 changed example. In particular, the thickness of the tungsten plate 19 as in 17 shown on the clubface section 3 made larger than its thickness on the side of the projecting wall section 16 , Consequently, the center of gravity of the head section 1 be lowered more effectively.
A depth D of the groove 6 in this example is about 7 mm (neck portion) to 13 mm (tip portion), a height H from a contact point of the sole 4 with the ground when placing an iron golf club to a base of the trench 6 becomes about 3 mm (neck portion) to 5 mm (tip portion), and an effective face length L10 becomes about 24 mm (neck portion) to 36 mm (tip portion).
The arrangement of portions other than that described above is substantially the same as that in FIG 13 shown example. Thus, effects can be obtained which are similar to those achieved by the in 13 Example achieved are equivalent.
Now, another example according to the present invention will be described with reference to FIG 18 to 20 described. 18 is a rear view of a head section 1 a Hohlraumeisengolfschlägers another example according to the present invention, and 19 is a cross-sectional view taken along a line XIX-XIX in 18 ,
As in 18 shown in this example is a back 20 at the head section 1 appropriate. The back part 20 forms a section of a sole section 4 and a projecting wall section 16 behind a clubface section 3 , As material for the body of the head section 1 For example, any material formed by forging such as mild steel, stainless steel and other iron-based alloy materials, aluminum, an aluminum alloy, titanium, a titanium alloy, a magnesium alloy, etc. may be used.
As material for the back 20 For example, it is preferable to select a material having a higher specific gravity than that of the material for the body of the head portion. For example, if the material of the head section 1 Aluminum, an aluminum alloy, titanium, or a titanium alloy, mild steel, a stainless steel alloy, a copper alloy, a cobalt alloy, a tungsten alloy, a nickel alloy, and the like may be used as the material for the back 20 be used, and if the material of the Kör pers of the head section 1 is an iron-based alloy material such as mild steel or stainless steel, then a copper-based alloy, a tungsten alloy, and the like may be used as the material for the back 20 be used.
As described above, by attaching the back part 20 to the body of the head section 1 as in 19 illustrated a groove portion (undercut section) 6 behind the clubface section 3 can be formed, and the effective face length can be made larger than in the case of each of the examples described above. Thus, the return property of the face portion 3 be improved.
By choosing a material with a higher specific gravity than that of the material of the body of the head section 1 as material for the back 20 can the centroid depth of the head section 1 be enlarged while the center of gravity of the head section 1 is lowered.
Furthermore, the attachment of the back offers 20 to the body of the head section 1 also the following advantages:
Although a cavity of a considerable size may be formed in an iron golf club head formed by casting, there is a disadvantage that this head provides an inferior feel as compared with the head made by forging.
On the other hand, it is difficult to produce a large undercut cavity by machining in the body of the head portion formed by forging 1 to build. Especially in an iron head with a large loft angle, it is difficult to enlarge the cavity area by machining from the inside of the cavity. In addition, there is usually a portion protruding rearward near the top edge on the back of an iron head so that there is a limit to the depth that can be achieved in terms of angle using a straight cut sheet by cutting, and Of course, even if a cutting blade having a specific shape such as a T-slot cutter is to be used, there is a limit to the depth that can be achieved by cutting due to the restriction of the size of the cavity opening and the like.
By attaching the back part 20 to the body of the head section 1 however, as described above, an undercut cavity of a desired size may be behind the body of the head portion 1 also be formed when the head section 1 was formed by forging. As a result, a head section 1 be provided, which offers an excellent feel and has a large center of gravity and a low center of gravity.
In addition, with the iron head according to the present invention, a deep undercut portion can be seen from the outside, and the fact that the back piece is a different type of material than the body of the head portion 1 can also be perceived externally so that a user can play golf while objectively understanding the performance of the iron head according to the present invention.
In addition, in this example, the depth and the shape of the groove 6 , the height of a contact point of the sole portion 4 with the ground when placing an iron golf club up to the base of the groove 6 and the effective clubface length similar to those in FIG 13 shown example or in the 17 be shown example.
In addition, it is also possible, the depth distribution of the groove 6 from the top section 8th out to the neck section 9 similar to that in each of the examples described above. In addition, the ratio between a thickness of a ball impact portion in the face portion 3 and a thickness in a region other than the ball impact portion in the face portion 3 same as the one in 1 and the following cases shown.
The following is a method of manufacturing the in 18 and 19 with reference to iron heads 20 described.
First, a body of a head section 1 with integrated hosel and face produced by subjecting a rod of circular cross section to forging. In this case, a cavity section 2 formed as far as possible. In particular, the width of the edge portion is on the side of the sole portion 4 made tight.
A flat section 25 is formed by forming this edge portion flat during forging or by post-processing such as machining. In addition, during forging or machining, protrusions (protruding portions) or recessed portions become plural places on the planar portion 25 provided. In the in 20 shown example are projecting sections 21 trained in three places. Instead of the flat section 25 a slightly curved surface portion may be provided. In this case, a curved surface portion having a shape adapted to the above curved surface portion should also be on the side of the back portion 20 be provided.
On the other hand, a back part 20 formed in a separate step using a material having a higher specific gravity than that of the material of the body of the head portion 1 , The back part 20 may also be formed by forging and the like. The back part 20 is provided with recessed portions or protrusions (protruding portions) at positions corresponding to those in the flat portion 25 provided protrusions (projecting portions) or recessed portions correspond. In the in 20 shown example are depression sections 22 trained in three places.
In the back 20 with the construction described above, the portion that is against the flat portion 25 should be pushed flat to form a flat section. The flat section and the recessed sections 22 can also be formed by forging, machining, etc. Then the flat section becomes the flat section 25 of the body of the head section 1 hung up, and the projecting sections 21 be in the recessed sections 22 press-fit.
Thus, as in 19 shown the body of the head section 1 and the back part 20 integrated, and a head section 1 with a groove 6 with an undercut shape behind the clubface section 3 can be made.
When next becomes a golf club set according to the present Invention described.
The golf club set according to the present invention includes a long iron golf club (eg, iron golf club No. 1 to No. 4), which is disclosed in US Pat 21B is shown, a medium iron golf club (eg Eisengolfschläger No. 5 to No. 7), which in 1 and the like, and a short iron golf club (eg, No. 8 iron golf club up to a sand wedge), which is shown in U.S. Pat 21A is shown.
The long iron golf club, the medium iron golf club and the short iron golf club are all with a Kopfab section 1 provided, which has a cavity portion 2 , a clubface section 3 and a sole section 4 and on a surface of the sole portion 4 on the side of the cavity section 2 with a groove 6 is provided.
In the long iron golf club, a height H is a base of the groove provided in a land center portion 6 for example, 8 mm, and its depth D is 11 mm. In the middle iron golf club, a height H is a base of the groove provided in a surface center portion 6 for example, 13 mm, and its depth D is 7 mm. In the short iron golf club, a height H is a base of the groove provided to a land center portion 6 in for example 13 mm, and its depth D is 6 mm.
Accordingly, the depth D in the area center portion is as shown in FIG 22A to 22C represented by the long iron golf club ( 22A ) provided groove 6 greater than the depth D in the area center section of the middle iron golf club ( 22B ) provided groove 6 , and the depth D in the area center portion of the groove provided in the middle iron golf club 6 is greater than the depth D in the area center section of the in the short iron golf club ( 22C ) provided groove 6 ,
As described above, the effective clubface lengths of the short iron golf club, the medium iron golf club and the long iron golf club can be increased by gradually increasing the depth of the sole section 4 provided groove 6 be optimized from a short iron golf club to a long iron golf club.
In addition, the groove 6 on a surface of the sole portion 4 on the side of the cavity section 2 of the long iron golf club and the medium iron golf club, and the depth D of the groove 6 in the area center portion of the long iron golf club can be made larger than the depth D of the groove 6 in the area center portion of the middle iron golf club, while the groove 6 on a surface of the sole portion 4 on the side of the cavity section 2 is not provided in the short iron golf club. In this case, too, the same effects as those achieved in the case described above can be obtained.
According to the iron golf club of the present invention described above, the return property of the entire club face portion can be improved so that the flying distance can be ensured even in a staggered stroke, and too large a reduction in flying distance in the staggered stroke can be prevented. In addition, the iron golf club head according to the present invention has a cavity portion and a groove, so that the head portion is reduced in weight while the center of gravity can be increased.
Consequently can according to the iron golf club the present invention too large a reduction in flight distance be prevented in the staggered stroke, while a lighter weight is achieved and the center of gravity is increased.
According to the golf club set The present invention can be applied to a long iron golf club whose improved range is required, the effective clubface length are increased and a higher one Restoring property of the clubface section can be achieved in a medium iron golf club the default property of the clubface section be improved while the directivity of the beaten ball is ensured, and with a short iron golf club, of which is required that a blow that hits the ball near the pin is caused, is the directivity of the beaten Balls enhances what provides a golf club set with iron golf clubs capabilities has that in their characteristics coincide.
The The present invention can be applied to a golf club be used.
Iron golf club with a head section having a cavity section ( 2 ), a face section ( 3 ) and a sole section ( 4 ), wherein a groove ( 6 ) extending along the face portion ( 3 ) extends to a surface of the sole portion ( 4 ) on the side of the cavity section ( 2 ) and a thickness of a ball impact section ( 11 ) in the face section ( 3 ) is made larger than a thickness of an upper edge side portion of the face portion (FIG. 3 ), which between the Ballschlagabschnitt ( 11 ) and the top edge side section ( 12 ) is arranged; characterized in that the thickness of the ball impact section ( 11 ) is at least as thick as the thickness of a sole-side portion ( 13 ) of the clubface section ( 3 ), which between the Ballschlagabschnitt ( 11 ) and the sole portion ( 4 ) is arranged and along the groove ( 6 ), and the height (H) of a base of the groove ( 6 ) from a base of the sole portion ( 4 ) on the side of the neck ( 9 ) is made smaller than on the side of the tip section ( 8th ).
An iron golf club according to claim 1, wherein the thickness of the ball impact section ( 11 ) is made larger than a thickness of a tip-side portion ( 14 ) of the clubface section ( 3 ), that between a tip section ( 8th ) of the head portion and the ball impact portion ( 11 ) and greater than a thickness of a neck-side portion (FIG. 15 ) of the face portion which is between a neck portion ( 9 ) of the head portion and the ball impact portion ( 11 ) is arranged.
An iron golf club according to claim 1, wherein the tip-side portion (Fig. 14 ) includes a first region which is on the side of the upper edge portion ( 7 ) and a second area located on the side of the sole portion (FIG. 4 ), the neck-side portion ( 15 ) contains a third area which is on the side of the upper edge section ( 7 ), and a fourth area located on the side of the sole portion (FIG. 4 ), and a thickness of the first region is made smaller than a thickness of the second region and a thickness of the third region is made smaller than a thickness of the fourth region.
An iron golf club according to claim 1, wherein the sole portion comprises a projecting wall portion (Fig. 16 ) having a side wall of the groove ( 6 ) and along the face portion ( 3 ) to the top edge portion ( 7 ) rises.
An iron golf club according to claim 1, wherein a through-hole ( 23 ) in the sole portion ( 4 ) is provided so that from a base surface of the sole region of the cavity area ( 2 ), and the groove ( 6 ) is provided by attaching a blocking element ( 19 ) having the one end portion in the through hole (FIG. 23 ) on one side of the base of the sole portion ( 4 ) closes.
An iron golf club according to claim 5, wherein a specific gravity of a material containing the Blo trim element ( 19 ) is made larger than a specific weight of a material which covers the body of the head portion ( 1 ).
An iron golf club according to claim 1, wherein a rear portion located behind the face portion ( 3 ) in the head section ( 1 ) is arranged from a back ( 20 ) formed one of the body of the head portion ( 1 ) is different element, and the groove ( 6 ) between the body of the head section ( 1 ) and the back ( 20 ) is provided by attaching the back ( 20 ) on the body of the head section ( 1 ).
An iron golf club according to claim 7, wherein a specific weight of a material comprising the back ( 20 ) is made larger than a specific weight of a material which covers the body of the head portion ( 1 ).
Iron golf club according to claim 1, wherein the head portion is formed by forging is.
Golf club set comprising a long iron golf club, a medium iron golf club and a short iron golf club, each according to claim 1, wherein a depth of the groove ( 6 ) in a central portion of the face portion ( 3 ) of the long iron golf club is greater than a depth of the groove ( 6 ) in a central portion of the face portion ( 3 ) of the medium iron golf club and a depth of the groove ( 6 ) in a central portion of the face portion ( 3 ) of the medium iron golf club is greater than a depth of the groove ( 6 ) in a central portion of the face portion ( 3 ) of the short iron golf club.
Golf club set comprising a long iron golf club and a medium iron golf club, each according to claim 1, and a short iron golf club having a head section ( 1 ), which has a cavity section ( 2 ), a face section ( 3 ) and a sole section ( 4 ), wherein a depth of the groove ( 6 ) in a central portion of the face portion ( 3 ) of the long iron golf club is greater than a depth of the groove ( 6 ) in a central portion of the face portion ( 3 ) of the medium iron golf club and the groove ( 6 ) on a surface of the sole portion ( 4 ) of the short iron golf club on the side of the cavity section ( 2 ) is not provided.
DE60120349T 2000-10-16 2001-08-01 Iron pool rack and golf rack set Active DE60120349T2 (en)
JP2000314678 2000-10-16
PCT/JP2001/006636 WO2002032514A1 (en) 2000-10-16 2001-08-01 Iron golf club and golf club set
DE60120349D1 DE60120349D1 (en) 2006-07-20
DE60120349T2 true DE60120349T2 (en) 2007-05-31
ID=18793884
DE60120349T Active DE60120349T2 (en) 2000-10-16 2001-08-01 Iron pool rack and golf rack set
US (2) US6709345B2 (en)
EP (1) EP1240924B1 (en)
JP (1) JP3658393B2 (en)
CN (1) CN1239215C (en)
CA (1) CA2393387C (en)
DE (1) DE60120349T2 (en)
TW (1) TWI221780B (en)
WO (1) WO2002032514A1 (en)
JP3310308B2 (en) 1991-07-19 2002-08-05 株式会社日立製作所 Program group management system
JP2987832B2 (en) 1996-07-10 1999-12-06 株式会社遠藤製作所 Iron type golf club
JP3035480U (en) * 1996-09-05 1997-03-18 ブリヂストンスポーツ株式会社 Golf club head
JPH1147322A (en) * 1997-08-05 1999-02-23 Jiyairo Sports:Kk Iron head for golf club and iron set
JP3392022B2 (en) 1997-10-16 2003-03-31 住友ゴム工業株式会社 Iron head
JP3476354B2 (en) 1997-12-18 2003-12-10 中央工業株式会社 Golf head
JP3066989U (en) * 1999-08-30 2000-03-07 復盛股▲分▼有限公司 Club head
2001-08-01 EP EP01954413A patent/EP1240924B1/en active Active
2001-08-01 CA CA002393387A patent/CA2393387C/en not_active Expired - Fee Related
2001-08-01 CN CNB018037763A patent/CN1239215C/en not_active IP Right Cessation
2001-08-01 WO PCT/JP2001/006636 patent/WO2002032514A1/en active IP Right Grant
2001-08-01 JP JP2002535748A patent/JP3658393B2/en active Active
2001-08-01 DE DE60120349T patent/DE60120349T2/en active Active
2001-10-03 TW TW090124397A patent/TWI221780B/en not_active IP Right Cessation
2001-10-12 US US09/976,496 patent/US6709345B2/en active Active
2004-01-14 US US10/757,131 patent/US7131913B2/en not_active Expired - Fee Related
CA2393387C (en) 2006-12-19
US20020065140A1 (en) 2002-05-30
EP1240924B1 (en) 2006-06-07
DE60120349D1 (en) 2006-07-20
EP1240924A4 (en) 2004-12-29
EP1240924A1 (en) 2002-09-18
TWI221780B (en) 2004-10-11
JPWO2002032514A1 (en) 2004-02-26
US20040147335A1 (en) 2004-07-29
US7131913B2 (en) 2006-11-07
CA2393387A1 (en) 2002-04-25
US6709345B2 (en) 2004-03-23
CN1395495A (en) 2003-02-05
JP3658393B2 (en) 2005-06-08
CN1239215C (en) 2006-02-01
WO2002032514A1 (en) 2002-04-25
TW552148B (en) 2003-09-11 Metalwood type golf club head having expanded additions to the ball striking club face