Wood golf club head

• US 5,255,913 A
• Filed: 09/06/1991
• Issued: 10/26/1993
• Est. Priority Date: 10/09/1989
• Status: Expired due to Term

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Tsuchida, Atsushi
• Primary Examiner(s): Millin, V.
• Assistant Examiner(s): Wong, Steven B.
• Application Number:
  US07/758,453
• Time in Patent Office: 781 Days
• Field of Search: 273/167 R, 273/167 F-167 K, 273/168, 273/169, 273/173, 273/78
• US Class Current: 473/329
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

In construction of a shell-type wood golf club head, at least its crown is made of a material of a rigidity lower than that of a material forming the other sections of the club head. The crown exhibits upward elastic deformation upon striking a ball and allows the face to incline rearwards, thereby providing a temporarily increased loft which suppresses undesirable back spin of the balls and assures longer shots and smooth run of the balls after landing.

Claims

1. A wood golf club head comprising a face, a sole, a back, a crown, a toe and a heel, the crown being made of a first shell and the face, the sole, the back, the toe and the heel being made of a second shell, the first shell being made of a first material having an elastic modulus in a range from 2 to 10 GPa and a thickness in a range from 4 to 12 mm and the second shell being made of a material different from the first shell and having an elastic modulus in a range from 150 to 250 GPa and a thickness such that the rigidity of the second shell is greater than that of the first shell whereby the crown exhibits upward elastic deformation upon striking a ball and allows the face to incline rearwardly so as to control the loft of the face.

2. A wood golf club head comprising a face, a sole, a back, a crown, a toe and a heel, the crown being made of a first shell and the face, the sole, the back, the toe and the heel being made of a second shell, the first shell being made of a first material having an elastic modulus of 210 GPa and a thickness in a range from 0.5 to 1.5 mm and the second shell being made of a material different from the first shell and having an elastic modulus in a range from 150 to 250 GPa and a thickness such that the rigidity of the second shell is greater than that of the first shell whereby the crown exhibits upward elastic deformation upon striking a ball and allows the face to incline rearwardly so as to control the loft of the face.