Abstract: A golf club with hollow construction, having a lowered center of gravity while retaining its inherent features such as a large moment of inertia and a deep position of the center of gravity. A head 1 comprises a face portion 10 for forming a face 3; a head body 11 including a shaft connecting portion 8 and a frame portion 15 joined to a rear peripheral surface of the face portion 10; a rear shell 12 joined to a rear peripheral surface of the frame portion 15. The rear shell 12 forms a hollow portion 17 together with the face portion 10 and the head body 11. The head 1 further includes a balance weight 13 joined to the rear shell 12 on the hollow portion 17 side. Therefore, there can be provided a golf club in which a miss hit leads to a less likelihood of unsuccessful consequence, so that it is easy to use even for beginners.

Abstract: A method of manufacturing a golf club head by which face lines, a club number display and logo marks can be formed without being affected by the configuration and material of the club head. Face lines 10, a club number display 11 and logo marks 12 and 13 are formed on the surface of a golf club head 1, using a laser beam processing machine. Stamps and receiving dies are no longer required for a respective production lot number or a respective club number, so that costs and time required for fabricating impressing stamp dies and receiving dies can be saved. Further, face lines 10, club number display 11 and logo marks 12 and 13 are able to be formed without being affected by the configuration and material of the golf club head 1.

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 which is so light as to be large-sized, with an improved durability, suited for easy casting. Ti—Be alloy is used for the material of a head 1. Be is present in Ti as a TiBe and/or TiBe2 in a proportion of about 20 mol %. The use of such Ti—Be alloy will result in the lightening of the head 1 as well as the enhanced Young's modulus thereof, thus improving the durability thereof. The Ti—Be alloy has such a lower melting point of 1000 degrees centigrade or below as compared to pure titanium, that the casting thereof is easy.

Abstract: A set of iron golf clubs whose balance weights are able to be easily manufactured, with a well-harmonized design as a set of golf clubs. The specific gravity of the materials of balance weights 17 are changed per each club number. Thus, the weight of the respective balance weights 17 can be changed per each club number, without changing the shape and size thereof For example, the specific gravity of the materials of the balance weights 17 may be made larger as the club number increases, thus enabling the setting of the weight of the respective heads 1 for each club number, with the weight of the respective head body 17 being kept substantially constant.

Abstract: A golf club is provided incorporating a head having an optimum loft angle, and lie angle for respective golfers. Moreover the golf club has minimal head deflection when striking a golf ball, and improved strength. To achieve this, a head attachment portion 13 disposed at a rear face 4A of a face 4, is substantially horizontally connected to a base end 9B of a shaft attachment portion 9. The shaft attachment portion 9 is connected to the face 4 via the head attachment portion 13. The face 4 and the shaft attachment portion 9 connected to the head attachment portion 13 are made separate, and hence at the time of assembling the various combinations, the loft angle and the lie angle can be freely adjusted. The impact force of a golf ball is transmitted directly from the face 4 to the head attachment portion 31, and the transmission force can be transmitted directly to the shaft 3 via the shaft attachment portion 9.

Abstract: A golf club with which you can strike a strong ball with a sharp feeling in striking as well as an enlarged sweet area. A concave portion 19 is formed at a rear side of a head body 16. A metallic balance weight 17 is fitted into the concave portion 19. A cover 18 for covering the balance weight 17 is fixed to the rear side of the head body 16. The specific gravity of a material for the balance weight 17 is smaller than that of the head body 16. Accordingly, a more sharp feeling in striking can be obtained as compared to a conventional head whose concave portion is hollow. Additionally, a sweet area can be enlarged owing to the weight distribution biased toward the periphery. The specific gravity of a material for the cover 18 is at least equal to that of the material for the head body 16. As a result, the depth of the center of gravity is made greater, thereby further widening a sweet area.

Abstract: A cavity back type head golf club which can prevent distortion of the face at the time of striking the ball, and improve attractiveness. A cover 17 is fixed to a head body 16 having a cavity 18 on a rear side, to cover the rear face opening of the cavity 18. The method of fixing involves fixing by pressing. The cover 17 is pressed into a spot facing 21 of the head body 16, to give a dovetail joint. If the cavity 18 is made by machining, then even if machining marks remain, these cannot be seen.

Abstract: A set of iron golf clubs whose balance weights are able to be easily manufactured, with a well-harmonized design as a set of golf clubs. The specific gravity of the materials of balance weights 17 are changed per each club number. Thus, the weight of the respective balance weights 17 can be changed per each club number, without changing the shape and size thereof. For example, the specific gravity of the materials of the balance weights 17 may be made larger as the club number increases, thus enabling the setting of the weight of the respective heads 1 for each club number, with the weight of the respective head body 17 being kept substantially constant.

Abstract: A golf club with less limitations to materials usable for a balance weight on a outer face of a sole, having a structure for the balance weight to be easily fixed to a head body. A hollow head body 16 of a long iron has an outer shell formed with a through-hole 21, corresponding to the sole 4 portion. A projection 34 is formed on an upper face of the balance weight 31 so that the projection 34 is inserted into the through-hole 21. Another through-hole 35 is formed in the projection 34, into which is pressed a taper pin 36 to be anchored there. As a result, the balance weight 31 is securely fixed to the head body 16. Unlike the fixing by caulking a balance weight itself, the invention does not need the extensibility of the material of the weight 31. Accordingly, tungsten-based materials, for example, are also made usable.

Abstract: A golf club and a manufacturing method therefor which can prevent a copper or copper alloy material for a head from corroding. The invention also aims at preventing electrification corrosion when combining this material with another material such as aluminum alloy. A head body 31 forming a peripheral portion of a head 1 is made of beryllium copper. A face member 32 pressed into a through-hole 33 of the head body 31 is made of aluminum alloy. A surface of the head body 31 is formed with a lower plating such as nickel plating, onto which is formed an upper plating such as chrome plating. By this plating, not only the corrosion of the head body 31 itself but also that of the face member 32 due to galvano-corrosion can be prevented.

Abstract: An iron-type golf club head which can elongate a travelling distance of balls for a long iron, and enable the better controlling of balls for a short iron. A head body 8, having a face 3, is formed from one material, while a hosel 7 formed from another material having the different specific gravity than that of the head body 8. For long irons, the material of the hosel 7 is thinner than that of the head body 8, while for short irons, the material of the head body 8 is denser than that of the hosel 7.

Abstract: An iron-type golf club head 1 can elongate a travelling distance of balls for a long iron and can enable the better controlling of balls for a short iron. A head body 8, having a face 3, is formed from one material, while a hosel 7 formed from another material having the different specific gravity than that of the head body 8. For long irons, the material of the hosel 7 is denser than that of the head body 8, while for short irons, the material of the head body 8 is denser than that of the hosel 7. A friction welding process may be used to join the head body 8 to the hosel 7.

Abstract: A golf club head having a larger sweet area for easier visual confirmation by a player when adressing a ball. Head body 1 is provided with denser weight at its back, thus displacing CG toward a back side of the head body 1 to enlarge a depth Le of CG and sweet area. The back of the head body 1 is located on the same plane relative to the back 6A of the weight 6, thus eliminating an obstacle to view when a player addresses a ball to enhance the concentration of the player. The back of the head body 1 is annularly formed with thickened portion 1B so that the entire periphery of the back is suitably weighted with titanium, aluminium or the alloy thereof. Owing to such dispersed weight distribution, a player can be free from a sense of unstability and accuratetly strike a ball if the ball is struck a little off the center of face 2.

Abstract: An iron-type golf club head for realizing free weight distribution of a head with a face made thinner. A flatted surface 1A of a head body 1 is formed with a plurality of honeycomb-shaped cavities by forging. Owing to the advantages associated with the forging and the honeycomb shape, a face 4 can be made thinner, while avoiding the deterioration of the strength of the face 4. Thus, a surplus weight thus obtained can be distributed to other parts of the head body 1.

Abstract: An iron-type golf club head having a larger sweet area while insuring a strength of a head. A back surface 1A of a metallic head body 1 is formed with plural rectangular cavities 5, 5A of different dimensions, opposite to the face 4 of the head body 1. The cavities 5, 5A are formed by forging, thus forming even and fine tissues and grain flow. Accordingly, the toughness and durability of material can be enhanced, so that the face 4 can be made thinner to a 1.0 to 3.5 mm thickness for an optimal weight distribution. As a result, a larger sweet area can be realized without damaging a strength of head.

Abstract: An wood-type golf club head having plural cavities formed in a back surface of a head body. A back surface 1A of a metallic head body 1 is formed with plural cavities 5, opposite to a face 4 of the head body 1. The cavities 5 are formed by forging, thus generating even and fine metallic tissues and grain flow. Accordingly, the toughness and durability of the material can be enhanced, so that face 4 can be made thinner to a 1.0 to 3.5 mm thickness for realizing an optional weight distribution. As a result, a larger sweet area can be realized without damaging a strength of head.

Abstract: A golf club head having a metallic and hollow head body, of which the volume is capable of being enlarged without decreasing the connection strength of a shaft. A hosel is formed thicker at its lower end than at its upper end, while a lower end of a shaft is provided evenly relative to a lower end of the hosel, or otherwise, protrudes slightly downward relative to the same. Thus, a length of the shaft can be saved without decreasing the connection strength of the same to the head body. In another embodiment of the invention, a collar is preformed at an intermediate portion of the hosel, thereby improving the connection strength of the hosel and shaft to the head body, and at the same time, metallic cladding will be unnecessary in manufacturing a golf club head, thereby improving its productivity.

Abstract: A golf club head, especially relating to an iron golf club head having a balance weight secured to the back of a head body, provided for improvemnt of securing such balance weight thereto. The back surface of the head body and the front surface of the weight are provided with concave portions opposite to each other, of which the side-peripheral surfaces decrease their cross-widths toward their contact surfaces. Into a space between the back and front surfaces is filled a connecting material such as an adhesive, and then solidified, thereby easily joining the head body to the weight, which can be ensured thanks to dovetail structures of the concave portions.

Abstract: A golf club head for lowering the center of gravity of a head body. A sole portion of the head body is formed with a concave portion, into which is fitted a denser balance weight of which the specific gravity is greater than that of the head body. The concave portion has a front end located at a face side of the sole portion, while a back end thereof is located backward relative to a center portion of the sole portion, said back portion protruding more backward at its toe side than at its heel side. According to the invention, the center of gravity G of a head body can be drastically lowered and the distance between the center of gravity G and a face can be elongated, thus enlarging so-called a sweet area without weakening a strength of the head body. Further, as the concave portion proturudes more backward at its toe side than its heel side, so-called slicing balls can be prevented.