JP2764882B2 - Golf club set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club set, and more particularly to an iron club having a loft angle of 35.
It relates to a combination of a plurality of clubs in a range up to ° .

[0002]

2. Description of the Related Art Golf clubs today are cultivated in the cull of hundreds of years of history, and the rationality of their shapes and functions is being scientifically proven. In particular, matching of a set of dozens of clubs as a golf club set exquisitely configures the functions of flying and direction required for golf play. However, the rationality of this club's set matching is reasonable for professional golfers with high head speeds and advanced men, but not necessarily for women and the elderly. The biggest problem has been discussed so far, and as many improvements have been made, the low-loft angle clubs called long irons for women and the elderly have been hit by professional golfers and men as shown in Figure 5. It is due to not flying like an advanced person.
Generally, as the loft angle decreases, the ball will fly farther. However, as the loft angle decreases, the ball does not fly more and more. Depending on the head speed, there is a loft angle at which the ball flies best. Generally,
The higher the head speed, the farther the ball flies at a lower loft angle, and the slower the head speed, the greater the loft angle. This is what is called the loft limit, and the loft angle of a club called a long iron is
This corresponds to the loft limit of general amateurs. In addition, for women and the elderly, the loft limit is a larger loft angle, and ordinary long irons are practically useless. The reason that the loft limit occurs is that the slower the head speed, the lower the ball speed that is launched,
Also, because the spin amount is small, the ball does not rise sufficiently. Therefore, many attempts have been made to raise the following balls, but each has its own problems.

[0003] In view of this, the face shape of a conventional iron club head is not changed, that is, the head shape is set such that the angle of the top edge viewed from the normal direction of the face surface of the head is within the range of 20 to 25 °. A club having a low center of gravity design as shown in FIG. 6 called a so-called cavity back in which the meat on the back side of the surface is cut to add weight to the sole side has been developed. A club with a low toe design in which the conventional head shape is changed to lower the toe side of the head has also been developed.
The club set of this roto-toe design had a roto-toe design from a long iron to a short iron, and was able to fully experience the low center of gravity compared to the cavity back iron.

[0004]

SUMMARY OF THE INVENTION The cavity described above
Although the back type has a low center of gravity design, the loft angle and
It is not a person in charge and is therefore
The problem of the loft limit has not been solved.

In a club with a low toe design that allows a person with a low head speed to raise the ball sufficiently, for example, the short iron is also a roto design, and the ball may be too high and the flight distance may fall. Was difficult to use.

Accordingly, the present invention is to provide a golf club set having a low center of gravity design that allows a person with a low head speed to sufficiently raise the ball and sufficiently satisfying the functions of flying and directionality as a golf club set. It is the purpose.

[0007]

[SUMMARY OF] To achieve the above object, the present invention is a set of plural golf clubs within loft angle of up to 35 °, of the club head
Set the sole in contact with the flat surface according to the specified lie angle
Head head viewed from the normal direction of the head face surface.
The top edge is up to 2 on the ascending slope from the heel side to the toe side.
Starting from a head with a small loft angle, do not exceed 0 °.
As the height increases, the height of the center of gravity of the head
It is configured to gradually decrease from a large head .

[0008]

In the present invention, for example, when the angles of the top edges of the 3rd to 6th irons are 10 °, 13 °, 15 °, and 18 °, the height of the center of gravity is 18.7 mm, 19.4 mm, and 19 °.
It was 7 mm and 20.3 mm, so that even a person with a slow head speed could sufficiently raise the ball, the flight distance increased, and the directionality was good. Further, in the present invention, for example, the height of the center of gravity of the 3rd to 6th irons is lower than that of the 7th and subsequent irons, so that even a person with a low head speed can increase the flight distance and improve the usability as a set.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the angle of a top edge 3 as viewed from the normal direction of the face surface 2 of a head 1 is a conventional angle a.
The angle is smaller than b. In FIG. 1, the x axis, y
As for the axis, the sole 4 of the head 1 is brought into contact with the plane 5 and set on the plane 5 at a predetermined lie angle α, and a straight line passing through the center of gravity G of the head 1 and parallel to the plane 5 and the face surface 2 is assumed. This was taken as the x-axis. Also, the center of gravity 1 of the head 1
Assuming a straight line that passes through G and is parallel to the face surface 2 and perpendicular to the x-axis, the straight line is defined as the y-axis. Angles a and b are head 1
Is the angle between the tangent and the top edge 3 when the tangent to the top surface on the toe 6 side is parallel to the x-axis. In addition, reference numeral 8 is heating
Show In FIG. 2, the z-axis is assumed to be a z-axis assuming a straight line perpendicular to the x-axis and the y-axis and passing through the center of gravity G.
A straight line c which is in contact with the toe 6 of the head 1 and parallel to the y-axis is xy
Assuming on a plane, the distance from the intersection point p of the straight line C and the x axis to the center of gravity G is X _G, and the distance from the leading edge 7 of the sole 4 to the orthographic projection G ′ of the center of gravity G of the head 1 onto the face surface 2 Is defined as the center of gravity distance Y _G, and the distance from the center of gravity G to the orthogonal projection G ′ is defined as the center of gravity depth Z _G. Furthermore, plane 5
The distance from to the orthogonal projection G 'and center of gravity height H _G.

It is known that the angle a of the conventional top edge is as follows, for example. 3-iron _{(3I) ··· 20.0 ° H G} ··· 21.0mm 4 -iron _{(4I) ··· 20.3 ° H G} ··· 20.9mm 5 -iron (5I) ·· · 20.2 ° H _G ··· 20.7mm 6-iron _{(6I) ··· 20.2 ° H G} ··· 20.8mm 7 -iron _{(7I) ··· 20.5 ° H G} ·・ ・ 20.8mm No.8 iron (8I) ・ ・ ・ 20.2 ° H _G・ ・ ・ 20.2mm No.9 iron (9I) ・ ・ ・ 20.2 ° H _G・ ・ ・ 20.0mm Pitching wedge ( to _{PW) ··· 20.5 ° H G ···} 20.0mm such golf club set, the embodiment of the present invention to set the following as the angle b, and low center of gravity height H _{G. 3I ··· 10.0 ° H G ··· 18.7mm} 4I ··· 13.0 ° H G ··· 19.4mm 5I ··· 15.0 ° H G ··· 19.7mm 6I · 18.0 ° H _G 20.3 mm In the golf club set of the present invention, the loft angle is 35 °.
A value of 7I or less, which is super, may be the same as that of the related art, or the angle of the top edge may be gradually increased from a head having a small loft angle β within a range of 20 ° or more.

[0011] In the present invention, for a set of golf clubs in the range loft angle β is up to 35 °, of the head 1 source
Contact the plane 4 and set it at a predetermined lie angle,
Of the head 1 viewed from the normal direction of the face surface 2 of the head 1
Top edge 3 climbs from heel 8 to toe 6
At a loft angle β so as not to exceed 20 ° at the maximum.
Head 1 and the height of the center of gravity of head 1
H _G is gradually reduced from the head 1 having a large loft angle β.
Was. Particularly preferably, the conventional angle a is 20 to 25 °.
The weight (indicated by reference numeral 10 in FIG. 1) of the cut top edge side is added to the sole 4 side of the head 1 in order to make the same weight as the head.

[0012] Figure 3 is a graph showing the results of the center-of-gravity height H _G was measured when changing the angle of the top edge of the golf club 3I~6I respective without changing the weight, apparent from this graph like, even lower center of gravity height H _G as the angle of the top edge is small.

[0013] Figure 4, when the angle of the top edge of the predetermined angle, the golf club of each count is indicative of the result of measurement before it becomes the center of gravity height H _G of the extent to which each.

[0014] In addition, when the angle of the top edge of the conventional golf club is preferably smaller than the angle a, the weight is added to the sole 4 side of the head 1 so as not to change the weight. Make it the same weight as the club. For example, 7I to PW are configured as follows. 7I 20.5 ° H _G 20.8mm 8I 21.0 ° H _G 20.4mm 9I 21.5 ° H _G 20.2mm PW ..22.0 ° H _G・ ・ ・ 20.2mm

[0015] It should be noted that the present invention can also be applied to a set of golf clubs, including a driving iron, also head of the golf club set according to the present invention may be a hollow also in the cast. Furthermore, in a set having a loft angle of up to 35 °, if the face width of the head is narrowed or the neck is narrowed, the height of the center of gravity can be further reduced. Also, if or narrow the narrow or neck the face width of a golf club head in the range of up to a loft angle of 35 °, it is possible to lower the golf club only the height of the center of gravity of this range, set Usability improves.

[0016]

As described above, according to the present invention, the height of the center of gravity is lowered, so that even a person with a low head speed can sufficiently raise the ball, and the flight distance is increased.
Also , the usability as a set is improved.

[Brief description of the drawings]

FIG. 1 is a view of a face of an iron club as viewed from a face side.

FIG. 2 is a view of the iron club as viewed from the toe side.

FIG. 3 is a graph showing the results of measuring the height of the center of gravity when the angle of the top edge of each of the golf clubs 3I to 6I is changed without changing the head weight.

FIG. 4 is a graph showing the results of measuring the height of the center of gravity of the golf clubs of each count when the angle of the top edge is a predetermined angle;

FIG. 5 is a graph comparing the distance traveled by iron number of a conventional iron club between a professional / advanced person and a woman / elderly person.

FIG. 6 is a perspective view of an iron club called a cavity back.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head 2 Face surface 3 Top edge 4 Sole b Angle of top edge β Loft angle

Claims (1)

(57) [Claims] 1. A set of a plurality of golf clubs having a loft angle within a range of up to 35 °, wherein a sole of a head of the club is brought into contact with a flat surface to obtain a predetermined golf club .
Set at the lie angle, and normal direction of the face of the head
From the heel side to the toe side
So that the loft angle does not exceed a maximum of 20 °
Gradually increases from a smaller head and the center of gravity of the head
The height gradually decreases from the head with a large loft angle
Golf club set, characterized in that the sea urchin configuration.