Iron golf club

• US 20010055996A1
• Filed: 04/12/2001
• Published: 12/27/2001
• Est. Priority Date: 05/17/2000
• Status: Abandoned Application

• Current Assignee: Mizuno Corporation
• Original Assignee: Mizuno Corporation
• Inventors: Masuda, Naoyuki, Iwata, Mototaka
• Application Number:
  US09/833,319
• Publication Number:
  US 20010055996A1
• Time in Patent Office: Days
• US Class Current: 473/350
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

The inventive iron golf club comprises a head part having a face, and a restitution coefficient is in the range of at least 0.81 and not more than 0.95 when colliding a ball against a sweet spot in the face at a speed of 44 m/s. In the aforementioned iron golf club, the effective face area of the head part is at least 2500 mm² and not more than 5000 mm², the effective deflection length is at least 36 mm and not more than 72 mm, and the thickness of the face is at least 1.0 mm and not more than 2.5 mm at the sweet spot.

Claims

1. An iron golf club comprising a head part having a face, wherein

a restitution coefficient is in the range of at least 0.81 and not more than 0.95 when colliding a ball against a sweet spot in said face at a speed of 44 m/s.

2. The iron golf club according to

claim 1

, wherein

an effective face area being the surface area of a portion of said face deflectable at the hit is at least 2500 mm² and not more than 5000 mm².

3. The iron golf club according to

claim 1

, wherein

said head part has a hollow structure,

wall portions are provided on the peripheral edge of a face part in said head part, and

the surface area of a central portion of said face located between said wall portions is at least 2500 mm² and not more than 5000 mm².

4. The iron golf club according to

claim 1

, wherein

an effective deflection length being the length of a portion of said face deflectable at the hit, passing through said sweet spot of said face in a direction perpendicular to the ground, is at least 36 mm and not more than 72 mm.

5. The iron golf club according to

claim 1

, wherein

said head part has a hollow structure,

wall portions are provided on the peripheral edge of a face part in said head part, and

an effective deflection length being the length between said wall portions, passing through said sweet spot of said face in a direction perpendicular to the ground, is at least 36 mm and not more than 72 mm.

6. The iron golf club according to

claim 1

, wherein

the thickness of a face part is at least 1.0 mm and not more than 2.5 mm at said sweet spot of said face.

7. The iron golf club according to

claim 1

, wherein

the elasticity of a face part in said head part is at least 30 GPa and not more than 210 GPa.