Iron golf club and a set of iron golf clubs

Abstract

An iron golf club and a set of iron golf clubs which realize the accurate travelling direction of a ball as well as the accurate travelling distance thereof. Both a tolerance of a loft angle and that of a lie angle of a head 1 are set within a range of +0.25 degree. For a set of iron golf clubs, a difference between loft angles of respective two golf clubs of adjacent club numbers is set so as to have a tolerance of ±0.5 degree or less. To realize such accuracy, there is proposed for example a head 1 constructed of a head body 21 and a hosel member 22 , which are joined to each other by laser welding, electron beam joining or amorphous joining.

What is claimed:  
     
         1 . An iron golf club having a head, said head comprising a striking face and a shaft connecting portion, said head being constructed of a head body and a column-shaped hosel member, said hosel member being formed with a flat end face, serving as a shaft connecting portion, said head body being formed by forging, provided with a short, column-shaped fitting portion for joining the hosel member thereto, said fitting portion having an end face which is formed so flat that it is joined to the flat end face of said hosel member so that a tolerance of a loft angle of the head is set within a range of ±0.25 degree.  
     
     
         2 . An iron golf club having a head, said head comprising a striking face and a shaft connecting portion, said head being constructed of a head body and a column-shaped hosel member, said hosel member being formed with a flat end face, serving as a shaft connecting portion, said head body being formed by forging, provided with a short, column-shaped fitting portion for joining the hosel member thereto, said fitting portion having an end face which is formed so flat that it is joined to the flat end face of said hosel member so that a tolerance of a lie angle of the head is set within a range of ±0.25 degree.  
     
     
         3 . An iron golf club according to clam  1 , wherein said head body and hosel member are joined to each other by means of laser beam welding.  
     
     
         4 . An iron golf club according to clam  2 , wherein said head body and hosel member are joined to each other by means of laser beam welding.  
     
     
         5 . An iron golf club according to  claim 1 , wherein said head body and hosel member are joined to each other by means of electron beam joining.  
     
     
         6 . An iron golf club according to  claim 2 , wherein said head body and hosel member are joined to each other by means of electron beam joining.  
     
     
         7 . An iron golf club according to  claim 1 , wherein said head body and hosel member are joined to each other by means of amorphous joining.  
     
     
         8 . An iron golf club according to  claim 2 , wherein said head body and hosel member are joined to each other by means of amorphous joining.  
     
     
         9 . An iron golf club according to  claim 1 , wherein said face is formed with score lines prior to being joined to said hosel member, while said head body is held with reference to respective reference positions of said score lines and face so that the end face of the fitting portion thereof may be machined to define a predetermined loft angle, said hosel member being joined to the end face of the fitting portion so that a central axis thereof may be perpendicular thereto.  
     
     
         10 . An iron golf club according to  claim 2 , wherein said face is formed with score lines prior to being joined to said hosel member, while said head body is held with reference to respective reference positions of said score lines and face so that the end face of the fitting portion thereof may be machined to define a predetermined lie angle, said hosel member being joined to the end face of the fitting portion so that a central axis thereof may be perpendicular thereto.  
     
     
         11 . A set of iron golf clubs consisting of a plurality of golf clubs, each comprising a head having a striking face, a shorter shaft connected thereto and a larger loft angle as a club number thereof increases, said head being constructed of a head body and a column-shaped hosel member, said hosel member being formed with a flat end face, said head body being formed by forging, provided with a short, column-shaped fitting portion for joining the hosel member thereto, said fitting portion having an end face which is formed so flat that it is joined to the flat end face of said hosel member so that a tolerance of a difference between two loft angles set for respective two golf clubs of adjacent club numbers is set in a range of ±0.5 degree.  
     
     
         12 . A set of iron golf clubs consisting of a plurality of golf clubs, each comprising a head having a striking face, a shorter shaft connected thereto and a larger lie angle as a club number thereof increases, said head being constructed of a head body and a column-shaped hosel member, said hosel member being formed with a flat end face, said head body being formed by forging, provided with a short, column-shaped fitting portion for joining the hosel member thereto, said fitting portion having an end face which is formed so flat that it is joined to the flat end face of said hosel member so that a tolerance of a difference between two lie angles set for respective two golf clubs of adjacent club numbers is set in a range of ±0.5 degree.  
     
     
         13 . A set of iron golf clubs according to  claim 11 , wherein said head body and hosel member are joined to each other by means of laser beam welding.  
     
     
         14 . A set of iron golf clubs according to  claim 12 , wherein said head body and hosel member are joined to each other by means of laser beam welding.  
     
     
         15 . A set of iron golf clubs according to  claim 11 , wherein said head body and hosel member are joined to each other by means of electron beam joining.  
     
     
         16 . A set of iron golf clubs according to  claim 12 , wherein said head body and hosel member are joined to each other by means of electron beam joining.  
     
     
         17 . A set of iron golf clubs according to  claim 11 , wherein said head body and hosel member are joined to each other by means of amorphous joining.  
     
     
         18 . A set of iron golf clubs according to  claim 12 , wherein said head body and hosel member are joined to each other by means of amorphous joining.  
     
     
         19 . A set of iron golf clubs according to  claim 11 , wherein said face is formed with score lines prior to being joined to said hosel member, while said head body is held with reference to respective reference positions of said score lines and face so that the end face of the fitting portion thereof may be machined to define a predetermined loft angle, said hosel member being joined to the end face of the fitting portion so that a central axis thereof may be perpendicular thereto.  
     
     
         20 . A set of iron golf clubs according to  claim 12 , wherein said face is formed with score lines prior to being joined to said hosel member, while said head body is held with reference to respective reference positions of said score lines and face so that the end face of the fitting portion thereof may be machined to define a predetermined lie angle, said hosel member being joined to the end face of the fitting portion so that a central axis thereof may be perpendicular thereto.