Abstract: An iron golf club head of a cavity type, specifically called a pocket type head, manufactured by forging to have a lowered center of gravity, capable of giving an excellent ball hitting sensation in hitting a golf ball. This iron golf club head is integrally provided by forging and includes a top 2 in an upper portion of the head, a face 3 at a front, a sole at a bottom, a back 5 at a rear. A main recess 7 is formed to extend toward the face 3 in the back 5, and a concavity 8 is formed by a bending process, to extend from the main recess 7 to the sole 4.

Abstract: A golf club includes a shaft and a metal head attached to the shaft. The metal head includes a plurality of metal pieces fixed together by means of laser welding. For example, a face member of the head is manufactured by laser welding three metal pieces; i.e., a center metal piece, an intermediate metal piece, and an outer metal piece.

Abstract: In a driver golf head (1) comprising a face (4) having a hitting surface, a sole (3) forming a lower portion, and a crown (5) forming an upper portion, the sole (3) is improved. The sole (3) in the position close to the face (4) was formed into an elastically deformable recess-projection shape, and part of the face (4) was formed into a projecting shape and integrated with the sole (3) to increase rigidity. Using a configuration with increased rigidity and decreased rigidity between the face (4) and sole to obtain an elastically deformable portion and providing a high-rigidity body (12) increased the repulsion force in the lower portion of the face and extended the traveling distance of the golf ball.

Abstract: In a driver golf head (1) comprising a face (4) having a hitting surface, a sole (3) forming a lower portion, and a crown (5) forming an upper portion, the sole (3) is improved. The sole (3) in the position close to the face (4) was formed into an elastically deformable recess-projection shape, and part of the face (4) was formed into a projecting shape and integrated with the sole (3) to increase rigidity. Using a configuration with increased rigidity and decreased rigidity between the face (4) and sole to obtain an elastically deformable portion and providing a high-rigidity body (12) increased the repulsion force in the lower portion of the face and extended the traveling distance of the golf ball.

Abstract: A golf club provides carry which does not deteriorate even when a golf ball is struck in a lower position on a face portion. The golf club includes a face portion 4 having a hitting surface, an improved sole portion 3 which forms a lower portion, and a crown portion 5 which forms an upper portion. A deformation portion B which is capable of elastic deformation is provided in concavoconvex form on the sole portion 3 in a position near the face portion 4. This deformation portion B is constituted by a protrusion 10 which is formed such that the sole portion 3 forms an obtuse angle ?, and a concave groove 11 which is formed in a direction linking a toe portion and a heel portion by a protrusion protruding towards the crown portion 5.

Abstract: A golf club having a sufficiently high strength in a welded portion even if a material that should avoid heat treatment is used. A reinforcing plate 21 is provided in a portion where a face member 16 is welded to a sole 4 of a head 1. Even if Ti15-5-3 whose toughness is lowered due to changes in tissues caused by welding heat, sufficiently high strength can be obtained in the welded portion.

Abstract: In a driver golf head (1) comprising a face (4) having a hitting surface, a sole (3) forming a lower portion, and a crown (5) forming an upper portion, the sole (3) is improved. The sole (3) in the position close to the face (4) was formed into an elastically deformable recess-projection shape, and part of the face (4) was formed into a projecting shape and integrated with the sole (3) to increase rigidity. Using a configuration with increased rigidity and decreased rigidity between the face (4) and sole to obtain an elastically deformable portion and providing a high-rigidity body (12) increased the repulsion force in the lower portion of the face (4) and extended the traveling distance of the golf ball.

Abstract: A golf club enables a golf ball to be hit farther without a decrease in ball traveling distance even if it is struck at a lower point on the club head face. A driver club head includes a face having a hitting surface, a sole forming the bottom of the head, etc. The sole is modified for improvement by providing an elastically deformable area having a recessed or projected configuration at a position of the sole closer to the face. The deformable area includes a bent portion formed at the lower end of the face. A bend is formed between the bent portion and the sole at an obtuse angle. The sole is provided with a recess or a projection to lower the rigidity of the sole. Thus, repulsion is enhanced to increase the ball traveling distance even if the ball is struck at a lower point on the face.

Abstract: An object of the present invention is to provide a golf club in which carry does not deteriorate even when a golf ball is struck in a lower position on a face portion. In a golf club constituted by a face portion 4 having a hitting surface, a sole portion 3 which forms a lower portion, and a crown portion 5 which forms an upper portion, the sole portion 3 of a driver club head 1 is improved. A deformation portion B which is capable of elastic deformation is provided in concavoconvex form on the sole portion 3 in a position near the face portion 4. This deformation portion B is constituted by a protrusion 10 which is formed such that the sole portion 3 forms an obtuse angle &agr;, and a concave groove 11 which is formed in a direction linking a toe portion and a heel portion by a protrusion protruding towards the crown portion 5. In order to increase hitting distance, restitution in a lower position on the face portion is increased.

Abstract: A golf club which comprises a head which is less deformable by the heat in welding. Separate reinforcing members 12 and 13 are provided on inner surface of a front edge 8A of a crown shell 8. Thus, the front edge 8A side is thickened and then the upper edge 4A of the face shell 4 is joined to the front edge 8A of the crown shell 8, by welding. The front edge 8A of the crown shell 8 is formed with a plurality of projections 11 which are anchored by the upper edge 4A of the face shell 4. The front edge 8A of the crown shell 8 is thickened by adding the thickness of the reinforcing members 12,13 to the thickness of crown shell 8 itself. Thus, thermal deformation and the sinking of the front edge 8A at the time of welding can be prevented, thus enabling the upper edge 4A to be joined to the front edge 8A as designed.

Abstract: A golf club whose ball-striking portion realizes an improved repulsive force against balls and improved durability of as face member against repeated strikes of balls. The face member 16 is made up of a plurality of metallic plates 20, 21 which are superimposed over an entire surface thereof. Each of the metallic plates has an outer peripheral edge extended rearwardly to form an extended portion 22. The extended portion 22 has a rear end portion 23 joined to a body member 17 and a crown member 18 which construct a rear part of the head 1. A repulsive force of the ball-striking portion against balls can be improved by making the metallic plates 20, 21 thinner and more flexible. The durability of the face member 16 can be improved by transmitting the impacts caused by the repeated strikes of balls to the body member 17 and the crown member 18.

Abstract: A golf club which comprises a head which is less deformable by the heat in welding. Separate reinforcing members 12 and 13 are provided on inner surface of a front edge 8A of a crown shell 8. Thus, the front edge 8A side is thickened and then the upper edge 4A of the face shell 4 is joined to the front edge 8A of the crown shell 8, by welding. The front edge 8A of the crown shell 8 is formed with a plurality of projections 11 which are anchored by the upper edge 4A of the face shell 4. The front edge 8A of the crown shell 8 is thickened by adding the thickness of the reinforcing members 12,13 to the thickness of crown shell 8 itself. Thus, thermal deformation and the sinking of the front edge 8A at the time of welding can be prevented, thus enabling the upper edge 4A to be joined to the front edge 8A as designed.

Abstract: A method for manufacturing a golf club with an improved durability which realizes so thin a club head that the head can be enlarged, suppressing the increase of the total weight. A cold rolled material, which is a beta type titanium alloy in a beta single phase and subjected to direct aging, is used for the head. Preferably, the material is subjected to at least 15% cold rolling reduction. The aging is able to improve durability and surface hardness. Due to the direct aging of the cold worked material without solution treatment, such a long time heat treatment is no longer necessary, thereby resulting in the reduction of production costs.

Abstract: A golf club having a sufficiently high strength in a welded portion even if a material that should avoid heat treatment is used. A reinforcing plate 21 is provided in a portion where a face member 16 is welded to a sole 4 of a head 1. Even if Ti15-5-3 whose toughness is lowered due to changes in tissues caused by welding heat, sufficiently high strength can be obtained in the welded portion.

Abstract: A golf club whose ball-striking portion realizes an improved repulsive force against balls and improved durability of as face member against repeated strikes of balls. The face member 16 is made up of a plurality of metallic plates 20, 21 which are superimposed over an entire surface thereof. Each of the metallic plates has an outer peripheral edge extended rearwardly to form an extended portion 22. The extended portion 22 has a rear end portion 23 joined to a body member 17 and a crown member 18 which construct a rear part of the head 1. A repulsive force of the ball-striking portion against balls can be improved by making the metallic plates 20, 21 thinner and more flexible. The durability of the face member 16 can be improved by transmitting the impacts caused by the repeated strikes of balls to the body member 17 and the crown member 18.

Abstract: A golf club whose position of the C.G. is easy to adjust, enabling a large-sized head. A shaft 7 is attached to a head 1 made by combining a plurality of metal shells 11, 12, 13, 14. The respective shells 11, 12, 14 are formed into a preset thickness such as the thickness “a” by a grinding process, using shot blasting S. Thus the reduction in weight is resulted by the grinding process, thus enabling the free distribution of the weight. As a result, it becomes easier to adjust the position of the C.G., realizing a golf club head with a larger volume.

Abstract: A golf club includes a shaft and a metal head attached to the shaft. The metal head includes a plurality of metal pieces fixed together by means of laser welding. For example, a face member of the head is manufactured by laser welding three metal pieces; i.e., a center metal piece, an intermediate metal piece, and an outer metal piece.

Abstract: A golf club which comprises a head which is less deformable by the heat in welding. Separate reinforcing members 12 and 13 are provided on inner surface of a front edge 8A of a crown shell 8. Thus, the front edge 8A side is thickened and then the upper edge 4A of the face shell 4 is joined to the front edge 8A of the crown shell 8, by welding. The front edge 8A of the crown shell 8 is formed with a plurality of projections 11 which are anchored by the upper edge 4A of the face shell 4. front edge 8A of the crown shell 8 is thickened by adding the thickness of the reinforcing members 12, 13 to the thickness of crown shell 8 itself. Thus, thermal deformation and the sinking of the front edge 8A at the time of welding can be prevented, thus enabling the upper edge 4A to be joined to the front edge 8A as designed.

Abstract: A method for manufacturing a golf club with an improved durability which realizes so thin a club head that the head can be enlarged, suppressing the increase of the total weight. A cold rolled material, which is a beta type titanium alloy in a beta single phase and subjected to direct aging, is used for the head. Preferably, the material is subjected to at least 15% cold rolling reduction. The aging is able to improve durability and surface hardness. Due to the direct aging of the cold worked material without solution treatment, such a long time heat treatment is no longer necessary, thereby resulting in the reduction of production costs.

Abstract: A golf club with an improved durability which realizes so thin a club head that the head can be enlarged, suppressing the increase of the total weight. A cold rolled material which is a beta type titanium alloy in a beta single phase and subjected to direct aging is used for the head. Preferably, the material is subjected to at least 15% cold rolling reduction. The aging is able to improve durability and surface hardness. Due to the direct aging of the cold worked material without solution treatment, such a long time heat treatment is no longer necessary, thereby resulting in the reduction of production costs.