Games using tangible projectile – Golf – Club or club support
Reexamination Certificate
2000-04-18
2002-02-05
Passaniti, Sebastiano (Department: 3711)
Games using tangible projectile
Golf
Club or club support
C473S332000, C473S338000, C473S349000, C473S350000
Reexamination Certificate
active
06344000
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to iron golf clubs.
Recently, attention has been focused on iron golf clubs with heads made of titanium. Titanium has a small specific gravity and high strength. Therefore, iron golf clubs with titanium heads enable the head size to increase and hence make it possible to enlarge the sweet spot.
In the field of golf clubs with titanium heads, particularly iron clubs, there have been developed clubs in which a metal having a large specific gravity is buried in the sole to lower the center of gravity of the clubhead. However, it is technically difficult to bury a different kind of metal in the sole, and this leads to a rise in the production cost and causes the rejection rate to increase.
Conventional iron golf clubs have been designed so that the ball contacts the sweet spot on the clubface at impact. However, the research conducted by the present inventor has revealed that the farthest distance is attained when the ball contacts the sweet spot at right angles to the clubface, and that the point where the farthest distance is obtained is not the sweet spot when the clubface meets the ball at a predetermined angle of tilt as is the case with iron golf clubs.
SUMMARY OF THE INVENTION
In view of the above-described background, an object of the present invention is to provide a variety of novel clubheads and iron golf clubs with the novel heads by reexamining the conventional views that iron golf clubs with a low center of gravity have good performance, and introducing a new criterion for evaluation to obtain iron golf clubs capable of sending the ball better distance.
Another object of the present invention is to find the true point on the face of an iron golf club that sends the ball farther than any other part of the face and to provide novel clubheads having such a point and also iron golf clubs with the novel heads.
To attain the above-described objects, the present invention provides a head of an iron golf club which includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with a hole near the face forming portion.
According to another aspect of the present invention, there is provided a head of an iron golf club which includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with a hole closer to the face than the center of gravity of the head.
According to another aspect of the present invention, there is provided a head of an iron golf club wherein a hole is formed in a lower portion of the head near the clubface.
The hole may be elongated in the widthwise direction of the head.
The hole may extend through the sole forming portion.
According to another aspect of the present invention, there is provided a head of an iron golf club which includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with a portion having a smaller specific gravity than that of the rest of the sole forming portion near the face forming portion.
According to another aspect of the present invention, there is provided a head of an iron golf club which includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with a portion having a smaller specific gravity than that of the rest of the sole forming portion at a position closer to the face than the center of gravity of the head.
According to another aspect of the present invention, there is provided a head of an iron golf club wherein a lower portion of the head near the clubface is provided with a portion having a smaller specific gravity than that of the rest of the head.
The portion having a smaller specific gravity may be elongated in the widthwise direction of the head.
According to another aspect of the present invention, there is provided a head of an iron golf club which includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with a hollow portion near the face forming portion.
According to another aspect of the present invention, there is provided a head of an iron golf club which includes a face forming portion having a face formed on the forward surface thereof, and a sole forming portion extending rearwardly from the lower end of the face forming portion. The sole forming portion has a sole formed on the bottom thereof. The sole forming portion is provided with a hollow portion at a position closer to the face than the center of gravity of the head.
According to another aspect of the present invention, there is provided a head of an iron golf club wherein a hollow portion is formed in a lower portion of the head near the clubface.
The hollow portion may be elongated in the widthwise direction of the head.
According to another aspect of the present invention, there is provided a head of a No. 2 iron golf club wherein in a state where the head has been correctly positioned with respect to a golf ball upon addressing, the angle &thgr; of intersection between a horizontal line containing a meeting point on the clubface and a line connecting the meeting point and the center of gravity of the head is in the range of from 0° to 19.2°.
According to another aspect of the present invention, there is provided a head of a No. 3 iron golf club wherein in a state where the head has been correctly positioned with respect to a golf ball upon addressing, the angle &thgr; of intersection between a horizontal line containing a meeting point on the clubface and a line connecting the meeting point and the center of gravity of the head is in the range of from 0° to 23.2°.
According to another aspect of the present invention, there is provided a head of a No. 4 iron golf club wherein in a state where the head has been correctly positioned with respect to a golf ball upon addressing, the angle &thgr; of intersection between a horizontal line containing a meeting point on the clubface and a line connecting the meeting point and the center of gravity of the head is in the range of from 0° to 26.0°.
According to another aspect of the present invention, there is provided a head of a No. 5 iron golf club wherein in a state where the head has been correctly positioned with respect to a golf ball upon addressing, the angle &thgr; of intersection between a horizontal line containing a meeting point on the clubface and a line connecting the meeting point and the center of gravity of the head is in the range of from 0° to 27.3°.
According to another aspect of the present invention, there is provided a head of a No. 6 iron golf club wherein in a state where the head has been correctly positioned with respect to a golf ball upon addressing, the angle &thgr; of intersection between a horizontal line containing a meeting point on the clubface and a line connecting the meeting point and the center of gravity of the head is in the range of from 0° to 29.3°.
According to another aspect of the present invention, there is provided a head of a No. 7 iron golf club wherein in a state where the head has been correctly positioned with respect to a golf ball upon addressing, the angle &thgr; of intersection between a ho
Hamada Jiro
Ito Takaoki
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Hamada Jiro
Passaniti Sebastiano
LandOfFree
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