Iron golf club set

Details Iron golf club set Iron golf club set

1999-08-23

2001-01-30

Chapman, Jeanette (Department: 3711)

Games using tangible projectile

Golf

Club or club support

C473S346000, C473S350000

Reexamination Certificate

active

06179726

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an iron golf club set.
2. Description of the Related Art
In general, an iron golf club set is composed of a plurality of iron golf clubs having respective club numbers different from each other. The iron golf club set is composed for example of 10 clubs, i.e., seven iron clubs of No. 3 to No. 9 and three wedge clubs of a pitching wedge, an approach wedge and a sand wedge.
The sole width of each of these iron golf clubs has a great influence on a position of center of gravity of the iron golf club.
Description will be given below of sole widths of the numbered clubs of the conventional iron golf club set with reference to FIG.
14
.
FIG. 14
is a graph illustrating a relationship between the numbered clubs of the conventional iron golf club set with their sole widths. An abscissa of the graph represents a number of the club and an ordinate represents a sole width. In
FIG. 14
, “X” indicates a straight solid line connecting values of sole width of the respective numbered clubs of the conventional iron golf club set (hereinafter referred to as the “prior art 1”), “Y” indicates a straight dotted line connecting values of sole width of the respective numbered clubs of another conventional iron golf club set (hereinafter referred to as the “prior art 2”), and “Z” indicates straight one-point chain lines connecting values of sole width of the respective numbered clubs of further another conventional iron golf club set (hereinafter referred to as the “prior art
3
”).
As is clear from
FIG. 14
, in the prior art
1
, the sole widths of the iron golf clubs gradually increase from No. 3 iron club toward a sand wedge. On the contrary, in the prior art
2
, the sole widths of the iron golf clubs gradually decrease from No. 3 iron club toward the sand wedge. In the prior art
3
, the sole widths of the iron golf clubs gradually decrease from No. 3 iron club toward No. 5 iron club, while the sole widths thereof gradually increase from No. 5 iron club toward the sand wedge.
However, in the prior art
1
, it is hard for a golf player to hit a golf ball with the use of the lower lofted irons, especially the so-called long iron clubs of No. 3 to No. 5 irons, thus requiring a skilful technique for using such lower lofted irons efficiently. Such a tendency will be described with reference to FIG.
15
. The lower lofted iron club of the iron golf club set of the prior art
1
has a narrow sole width W
2
. Accordingly, the center of gravity G
2
of the head H has a tendency to be apart upward from the sole
8
by the long distance H
2
and to come close to the face
7
, resulting in a smaller value of depth of the center of gravity, i.e., the shorter horizontal distance D
2
from the leading edge
11
to the center of gravity G
2
. The sweet spot of the iron golf club therefore becomes narrower, leading to difficulty to hit, and making it hard to increase the trajectory of the resultant ball flight after being hit by the club. In
FIG. 15
, “S” is a shaft, “
9
” is a hosel and “
10
” is a back face.
On the contrary to the prior art
1
, in the prior art
2
, it is hard for a golf player to hit a golf ball with the use of the higher lofted irons, especially the so-called short iron clubs of from No. 9 iron to the sand wedge, thus requiring a skilful technique for using such higher lofted irons efficiently.
In the prior art
3
, although the lower lofted iron club has a relatively long sole width, thus improving in hitting properties, the sole width of the lower lofted iron club is, at the most, substantially identical with the sole width of the sand wedge, thus making it still hard for an average recreational golf player to use such a club efficiently.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide an iron golf club set, which permits to lower the center of gravity of a club head to ensure a wide sweet spot, thus improving in hitting properties, and makes it possible to easily increase the trajectory of the resultant ball flight after being hit with the use of any one of numbered clubs, especially a lower lofted iron club.
In order to attain the aforementioned object, an iron golf club set of the present invention comprises:
a plurality of iron golf clubs having respective club numbers different from each other,
wherein:
sole widths of said iron golf clubs become gradually larger from No. 7 iron club toward a lower lofted iron club having a smaller loft angle than that of said No. 7 iron club and toward a higher lofted iron club having a larger loft angle than that of said No. 7 iron club; and
the sole widths of No. 5 iron club and iron golf clubs having a smaller loft angle than that of said No. 5 iron club are larger than a sole width of a sand wedge.
Shafts for the No. 7 iron club and iron golf clubs having a larger loft angle than that of the No. 7 iron club may have a larger tip diameter than that of shafts for No. 6 iron club and iron golf clubs having a smaller loft angle than that of the No. 6 iron club.
A face of each of the iron golf clubs may have on its back surface ribs projecting rearward; and the ribs may have projection lengths, which vary in a vertical direction and/or a horizontal direction of the face.
The ribs may form a honeycomb structure.


REFERENCES:
patent: 5209473 (1993-05-01), Fisher
patent: 5423546 (1995-06-01), Manning
patent: 5429353 (1995-07-01), Hoeflich
patent: 5547426 (1996-08-01), Wood
patent: 5665009 (1997-09-01), Sherwood

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