Iron-type golf club head
View Patent ↗An iron-type golf club head is assembled from a front component ( 4 ) made of a metal material having a specific gravity ρ1, a rear component ( 5 ) made of a fiber reinforced resin having a specific gravity ρ2 lower than the specific gravity ρ1, a toe-side component ( 6 ) made of a metal material having a specific gravity ρ3 higher than the specific gravity ρ1, and a heel-side component ( 7 ) made of a metal material having a specific gravity ρ4 higher than the specific gravity ρ1.
1. An iron-type golf club head comprising
a main body ( 2 ) having a front surface (FF) including an impact area for striking a ball, a back surface (FB) opposite to the front surface, and an outer circumferential surface (Ph) extending between the front surface and the back surface and including a top surface (TP), a toe surface (TO) and a sole surface (SO), and
a hosel ( 3 ) protruding upwardly from the main body on the heel-side of the main body and having a shaft inserting hole ( 3 e ) into which an end of a club shaft is inserted,
wherein
a major part of the front surface (FF) and a major part of the sole surface (FB) are formed by a metal material having a specific gravity ρ1,
a major part of the back surface (FB) and a major part of the top surface (TP) are formed by a fiber reinforced resin having a specific gravity ρ2 lower than the specific gravity ρ1,
a lower part of the toe surface (TO) is formed by a metal material having a specific gravity ρ3 higher than the specific gravity ρ1, and
the hosel ( 3 ) is made of a metal material having a specific gravity ρ4 higher than the specific gravity ρ1.
2. The iron-type golf club head according to claim 1 , which comprises:
a front component ( 4 ) made of said metal material having the specific gravity ρ1,
a rear component ( 5 ) made of said fiber reinforced resin having the specific gravity ρ2, and
a toe-side component ( 6 ) made of said metal material having the specific gravity ρ3.
3. The iron-type golf club head according to claim 2 , which further comprises:
a heel-side component ( 7 ) made of said metal material having the specific gravity ρ4.
4. The iron-type golf club head according to claim 2 , wherein
the front component ( 4 ) has an upper edge ( 4 TP) positioned within the front surface (FF), and
the rear component ( 5 ) comprises
a backside plate ( 5 a ) extending along a back surface of the front component ( 4 ), and
a top-side flange ( 8 ) protruding forward from the backside plate ( 5 a ) so as to form the top surface (TP) and an upper edge portion of the front surface (FF) above said upper edge ( 4 TP).
5. The iron-type golf club head according to claim 2 , wherein
the front component ( 4 ) has a toe-side edge ( 4 TO) positioned within the front surface (FF), and
the rear component ( 5 ) comprises
a backside plate ( 5 a ) extending along a back surface of the front component ( 4 ), and
an upper toe-side flange ( 9 ) protruding forward from the backside plate ( 5 a ) so as to form an upper part of said toe surface (TO) and an upper toe-side edge portion of the front surface (FF) outside said toe-side edge ( 4 TO).
6. The iron-type golf club head according to claim 4 or 5 , wherein
in the front view of the golf club head under a measuring state, the maximum height H of the main body, the lowest height h 1 of the rear component ( 5 ) appearing on the toe-side, and the lowest height h 2 of the rear component ( 5 ) appearing on the heel-side satisfy the following conditional expressions:
0.2=< h 1/ H=< 0.8, and
0.2=< h 2 /H=< 0.6.
7. The iron-type golf club head according to claim 4 or 5 , wherein
in the front view of the golf club head under a measuring state, the maximum height H of the main body, the lowest height h 1 of the rear component ( 5 ) appearing on the toe-side, and the lowest height h 2 of the rear component ( 5 ) appearing on the heel-side satisfy the following conditional expressions: 0.2=<h 1 /H=<0.8 and 0.2=<h 2 /H=<0.6, and
in the rear view of the golf club head under the measuring state, the lowest height A 1 of the rear component ( 5 ) appearing on the heel-side, the lowest height A 3 of the rear component ( 5 ) appearing on the toe-side, and the lowest height A 2 of the rear component ( 5 ) appearing in a central portion of the head satisfy the following conditional expression: A 1 >A 2 <A 3 .
8. The iron-type golf club head according to claim 5 , wherein
said toe-side component ( 6 ) comprises
a main part ( 6 a ) disposed backward of the front component ( 4 ), and
a lower toe-side flange ( 6 b ) protruding forward from the main part ( 6 a ) so as to form a lower part of said toe surface (TO) and a lower toe-side edge portion of the front surface (FF) outside said toe-side edge ( 4 TO).
9. The iron-type golf club head according to claim 2 , wherein
the front component ( 4 ) has
an upper edge ( 4 TP) positioned within the front surface (FF), and
a toe-side edge ( 4 TO) positioned within the front surface (FF), and
the rear component ( 5 ) comprises
a backside plate ( 5 a ) extending along a back surface of the front component ( 4 ),
a top-side flange ( 8 ) protruding forward from the backside plate ( 5 a ) so as to form the top surface (TP) and an upper edge portion of the front surface (FF) above said upper edge ( 4 TP), and
an upper toe-side flange ( 9 ) protruding forward from the backside plate ( 5 a ) so as to form an upper part of said toe surface (TO) and an upper toe-side edge portion of the front surface (FF) outside said toe-side edge ( 4 TO).
10. The iron-type golf club head according to claim 9 , wherein
said toe-side component ( 6 ) comprises
a main part ( 6 a ) disposed backward of the front component ( 4 ), and
a lower toe-side flange ( 6 b ) protruding forward from the main part ( 6 a ) so as to form a lower part of said toe surface (TO) and a lower toe-side edge portion of the front surface (FF) outside said toe-side edge ( 4 TO).