Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Takahiro Norimura

Daisuke Kohno

Kazuhiro Hayashi

Takashi Nakamura

Naruhiro Mizutani

Yasushi Sugimoto

An iron golf club head comprises; a head main body including a club face provided with score lines; a weight member having a specific gravity larger than that of the head main body; and a fixing member having a specific gravity larger than that of the head main body and less than that of the weight member, and fixed to the head main body by welding so as to cover the weight member. In a forward tilting state of the club head in which the score lines are horizontal and the club face is vertical, the distance D in the perpendicular direction to the club face from the backmost position of the club head to the center of gravity of the weight member is not more than 47.3% of the maximum thickness w of the club head which is the shortest distance from the backmost position of the club head to the club face.

Iron golf club head

A head includes a face part, a sole part, and a hosel part. The face part includes a hitting surface and a face back surface. A plurality of score lines are formed on the hitting surface. One or two or more back grooves are formed on the face back surface. With reference to a face center, the face part is divided into four regions: a toe upper region; a toe lower region; a heel upper region; and a heel lower region, and back-groove projected areas of at least two regions out of the four regions are different from each other. Back-groove occupation ratios of at least two regions out of the four regions may be different from each other.

Golf club head

An iron type golf club head has a club face provided with face lines and comprises an external weight member secured to a sole portion of a head main body and having a specific gravity larger than the head main body. The external weight member has a center of gravity located on the toe side of the middle point in the toe-heel direction of the face lines, and comprises a wide portion and a narrow portion located on the heel side of the wide portion. The wide portion is located on the toe side of the above-mentioned middle point. The wide portion has a front edge extending along the leading edge of the sole portion, and the narrow portion has a front edge extending along the leading edge and located backward of the front edge of the wide portion.

Iron type golf club head and iron type golf club set

An iron golf club head comprises; a head main body including a club face provided with score lines; a weight member having a specific gravity larger than that of the head main body; and a fixing member having a specific gravity larger than that of the head main body and less than that of the weight member, and fixed to the head main body by welding so as to cover the weight member. In a forward tilting state of the club head in which the score lines are horizontal and the club face is vertical, the distance D in the perpendicular direction to the club face from the backmost position of the club head to the center of gravity of the weight member is not more than 47.3% of the maximum thickness W of the club head which is the shortest distance from the backmost position of the club head to the club face.

An iron clubs golf club headcomprises a face plate and a head main body supporting a peripheral part of the face plate. The face plate is made of a titanium or a titanium alloy and provided on the club face with grooves. The head main body is made of a metal material having a specific gravity larger than that of the face plate. In a grooved range defined between positions in the toe-heel direction of the most toe-side end and most heel-side end of grooves of the face plate, a distance of at least part of a sole-side edge of the face plate is not more than 2.5 mm when measured from a sole-side profile line of the club head appearing in the front view of the club head, in the up-down direction of the club head.

Iron-type golf club head

An iron-type golf club head having a club face provide with a plurality of grooves extending in the toe-heel direction, satisfies the following conditions (1) the loft angle of the club head is not more than 41 degrees, (2) the thickness of the club head is not more than 23 mm, (3) the height of the club face measured along the club face at the position of the most toe-side end of the grooves is not less than 53 mm, (4) in a standard state of the club head set on a horizontal plane at the lie angle and loft angle specified for the club head, the ratio M/Sh (g sq&#xb7;cm/mm) of a moment M of inertia (g sq&#xb7;cm) around a first axis passing through a sweet spot in parallel with the club face and perpendicularly to the grooves, and a sweet spot height Sh (mm) which is the vertical height from the horizontal plane to the sweet spot is not less than 152.

A headincludes a head body hand a face plate pfixed to the head body h. The face plate pincludes a plate front surface fhaving a hitting face, a plate back surface b, and a plate side surface s. The head body hincludes a body side surface vopposed to the plate side surface s, and a receiving surface uwhich supports the face plate pfrom rear. A first contact part cis formed by contact between the body side surface vand the plate side surface s. A hollow part spis provided at a position adjacent to the first contact part c

A headincludes a head body hand a face plate pfixed to the head body h. The face plate pincludes a plate front surface fhaving a hitting face, a plate back surface b, and a plate side surface s. The head body hincludes a body side surface vopposed to the plate side surface s. A gap gp is provided at at least a part between the plate side surface sand the body side surface v

A headincludes a head body hand a face plate p. The face plate pincludes a plate front surface fhaving a hitting face, and a plate back surface b. The plate front surface fhas, on a peripheral edge part thereof, a step surface tpositioned at a rear with respect to the hitting face. The head body hhas a receipt surface upositioned at a rear of the plate back surface b, a front disposition part zpositioned at a front of the step surface t, and a hosel. The front disposition part zincludes a plastically deformed part dand a non-plastically deformed part n. A clearance between the non-plastically deformed part nand the receipt surface uforms an engaging part Eengaging a peripheral edge part of the face plate p

An iron-type golf club head comprises an upper heel-side region having a specific gravity &#x3c1;1, a lower heel-side region having a specific gravity &#x3c1;2, an upper middle region having a specific gravity &#x3c1;3, a lower middle region having a specific gravity &#x3c1;4, an upper toe-side region having a specific gravity &#x3c1;5 and a lower toe-side region having a specific gravity &#x3c1;6 which satisfy the following conditions: &#x3c1;1&#x3c;&#x3c1;2, &#x3c1;3&#x3c;&#x3c1;4, &#x3c1;5&#x3c;&#x3c1;6, &#x3c1;4&#x3c;&#x3c1;2, &#x3c1;4&#x3c;&#x3c1;6, &#x3c1;3&#x3c;&#x3c1;1, and &#x3c1;3&#x3c;&#x3c1;5. These six regions are sectioned by a horizontal plane, a toe-side vertical plane and a heel-side vertical plane.

Growing community of inventors

Kobe, Japan

Takahiro Norimura