Games using tangible projectile – Golf – Club or club support
Reexamination Certificate
1999-08-12
2001-09-11
Passaniti, Sebastiano (Department: 3711)
Games using tangible projectile
Golf
Club or club support
C473S345000
Reexamination Certificate
active
06287214
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a golf club head, and especially to a hollow metal club head.
2. Description of the Related Art
In general, a hollow metal head for a golf club is composed of four parts, i.e., a crown, a face, a sole and a hosel.
FIG. 6
is a partial sectional view illustrating a conventional hollow metal head. The metal head P
1
is composed of a crown C
2
, a face (not shown), a sole S
2
and a hosel H
2
. The hosel H
2
has a shaft insertion hole
10
, which extends obliquely upward so as to open. The bottom wall
11
closes the lower end of the shaft insertion hole
10
. Accordingly, in the metal head P
1
, the inside
13
of the hosel H
2
and a space
12
defined by the crown C
2
, the face (not shown) and the sole S
2
are separated from each other by means of the above-mentioned bottom wall
11
. The front-end portion of a shaft
9
for a golf club is inserted into the shaft insertion hole
10
of the hosel H
2
and fixed thereto. The conventional metal head P
1
described above will hereinafter be referred to as the “prior art
1
”.
FIG. 7
is a partial sectional view illustrating another conventional hollow metal head. The metal head P
2
is composed of a crown C
3
, a face (not shown), a sole S
3
and a hosel H
3
. The hosel H
3
has a shaft insertion hole
14
, which extends obliquely upward so as to open. A bottom wall
15
having a through-hole
15
a
is formed at the lower end of the shaft insertion hole
14
. Accordingly, in the metal head P
2
, the inside
17
of the hosel H
3
and a space
16
defined by the crown C
3
, the face (not shown) and the sole S
3
communicate with each other through the through-hole
15
a
of the bottom wall
15
. The front-end portion of a shaft
9
for a golf club is inserted into the shaft insertion hole
14
of the hosel H
3
and fixed thereto. The conventional metal head P
2
described above will hereinafter be referred to as the “prior art
2
”.
Irregularity in weight of golf club heads usually occurs when manufacturing them. However, in any one of the prior arts
1
and
2
, it is impossible to compensate the above-mentioned irregularity and in addition, to change uniformly the position of the center of gravity of the head. The front end of the shaft
9
comes into contact with the bottom wall
11
,
15
of the hosel H
2
, H
3
and is fixed thereto in such a condition by means of a fastening means such as an adhesive. It is therefore impossible to adjust the mounting position of the shaft
9
relative to the hosel H
2
, H
3
.
In the prior art
1
, the inside
13
of the hosel H
2
and the space
12
defined by the crown C
2
, the face (not shown) and the sole S
2
are separated from each other by means of the bottom wall
11
. Such a construction causes the following problems. More specifically, with respect to manufacture of the golf club head, when there are applied, for example, a step of forming the crown C
2
, the face (not shown) and the hosel H
2
as an integral body and a subsequent step of welding the sole S
2
to the above-mentioned integral body, there is a possibility that a part of a weld bead may separate in a molten state from the weld bead during forming it and solidifies so as to form a metallic piece, which is freely movable within the above-mentioned space
12
. The space
12
is insulated from the outside, with the result that the inside of the head cannot be cleaned and the above-mentioned metallic piece cannot be discharged outside. The existence of the metallic piece remaining in the inside of the head causes the occurrence of the noise when using the golf club head.
On the contrary, in the prior art
2
, the bottom wall
15
of the hosel H
3
has the through-hole
15
a
formed thereon, with the result that the inside of head can be cleaned through the through-hole
15
a
and the above-mentioned metallic piece can be removed. However, a shoulder portion is formed on the periphery of the through-hole
15
a,
which locates at the side of the hosel H
3
, so as to project perpendicularly to the inner surface of the hosel H
3
. Accordingly, it is not easy to insert a flexible tube for cleaning the inside of the head into the through-hole
15
a,
leading to a complicated cleaning operation. In addition, an adhesive for fixing the shaft
9
to the hosel H
3
may pass through the above-mentioned through-hole
15
a
into the inside of the head and solidify to form a lump of the adhesive. The thus formed lump of the adhesive causes the occurrence of the noise when using the golf club head. A grip mounted on the rear end of the shaft
9
has an air hole formed on its bottom wall portion. There may be caused a problem that water coming into the shaft
9
through the air hole infiltrates into the head through the through-hole
14
.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a golf club head, which permits to compensate the irregularity in weight of the golf club head, to change uniformly the position of the center of gravity of the head and to adjust the mounting position of the shaft relative to the hosel.
In order to attain the aforementioned object, a golf club head of the present invention comprises a hosel into which a front end portion of a shaft for a golf club is inserted, said hosel having at a lower and inside portion thereof a bottom wall,
wherein:
a balance adjusting screw screws on said bottom wall.
In addition to attainment of the object mentioned above, in order to permit to clean the inside of the head, a tapped hole formed on the above-mentioned bottom wall, for receiving the balance adjusting screw may pass through the bottom wall so as to cause a space defined by a crown, a face and a sole to communicate with an inside of the hosel.
In addition to attainment of the object mentioned above, in order to facilitate the cleaning of the inside of the head, the above-mentioned tapped hole may have a tapered portion formed on the periphery of the tapped hole, which locates at the side of the hosel.
The above-mentioned balance adjusting screw may have a head portion, which is to locate in the shaft insertion hole so that the front-end portion of the shaft can come into contact with the head portion.
A plate may be held between the balance adjusting screw and the front-end portion of the shaft.
REFERENCES:
patent: 4607846 (1986-08-01), Perkins
patent: 5039098 (1991-08-01), Pelz
patent: 5485998 (1996-01-01), Kobayashi
patent: 5540435 (1996-07-01), Kawasaki
patent: 5709614 (1998-01-01), Horiba
patent: 6001027 (1999-12-01), Hansberger
patent: 6089991 (2000-07-01), Yeh
patent: 443439 (1936-02-01), None
Oliff & Berridg,e PLC
Passaniti Sebastiano
Ryobi Limited
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