Bridgestone Sports Co., Ltd.

Tomonori Kitagawa

Kozue Wada

Takaharu Takechi

Masaya Takagi

Hiroshi Takahashi

Wataru Ban

Fumiaki Sato

A golf club head includes a hollow structure defined by a face, a crown, a sole, and a back. The crown includes a crown thick part on the back side, and the sole includes a sole thick part on the back side. The back includes a back end thinner than the thickest portion of each of the crown thick part and the sole thick part. The crown thick part and the sole thick part are separated by the back including the back end. The crown thick part and the sole thick part lie over and cover at least part of each other to form an overlap part extending in a toe-heel direction in a view in a crown-sole direction.

Golf club head

A golf club head that includes a face portion, an abutment member which abuts against a back surface of the face portion, and a fixing portion which is provided at a position separated from the back surface of the face portion and to which the abutment member is fixed. The abutment member includes a non-metal distal end portion which abuts against the back surface of the face portion, and a metal body portion which is fixed to the face portion. The body portion including a convex engaging portion provided in an end portion of the body portion. The distal end portion including a concave engaging portion which engages with the convex engaging portion.

Golf club screw

A golf club head includes a face including a ball striking surface, a sole defining the bottom of the golf club head, and an external rib in a recess that is formed in the external surface of the golf club head. The external rib includes a first rib, a second rib, and a third rib. The first rib is elongated in the toe-heel direction of the golf club head. The second rib is elongated in the face-back direction of the golf club head. The third rib extends continuously from the first rib to the second rib.

Golf club with weight and external rib in recess on sole

A golf club head having a hollow structure includes a face, a crown, and a sole. The sole includes multiple elongated ribs. The ribs includes a first rib, a second rib, a third rib, and a fourth rib that are arranged in order from the toe side to the heel side. An end of the first rib and a first end of the second rib are connected to form a first connection end. A second end of the second rib and a first end of the third rib are connected to form a second connection end. A second end of the third rib and an end of the fourth rib are connected to form a third connection end. Each of the first rib and the fourth rib is longer than each of the second rib and the third rib.

A golf club head that includes a head upper portion, a head bottom portion and a face portion between the head upper portion and the head bottom portion is provided with a slit that is open in the head upper portion on a back side of the face portion, extends in a toe-heel direction and is formed toward the head bottom portion, an intermediate member configured to be provided in the slit and abut against a first wall surface on the face portion side that defines the slit, and a fixing member configured to fix the intermediate member from a side of a second wall surface on the back side that is separated from the first wall surface and defines the slit.

A golf club head includes a face, a sole, an attachment member, an attachment part, and a rib. The face includes a ball-striking surface. The sole defines the bottom of the golf club head. The attachment member is attachable to the attachment part. The rib is formed on the internal surface of the golf club head, and at least partially surrounds the attachment part.

A hollow golf club head includes a face portion. The head includes a hollow head body, a face member that forms the face portion, and a connecting portion provided between the head body and the face member connects the head body and the face member. The head body includes a front surface to which the face member is connected through the connecting portion. The front surface of the head body includes an opening portion and a first concave portion formed around the opening portion and on which the connecting portion is arranged. The back surface of the face member includes a second concave portion on which the connecting portion is arranged.

A golf club head according to this invention is a wood type golf club head including a face portion, a crown portion, and a sole portion. A plurality of grooves are formed in the face portion. The depth of the plurality of grooves is less than 0.025 mm. A film having a thickness not more than the depth is formed on the face portion by a surface treatment.

Golf club head with grooves shallower than scorelines and surface film thickness

A golf club head of this invention includes a face portion, first and second interchangeable members, a first attachment portion from which the first and second interchangeable members are detachable, and a second attachment portion from which the first and second interchangeable members are detachable. The first interchangeable member is a reinforcing member that abuts against the rear surface of the face portion and restricts deformation of an abutment portion when the member is attached to the first attachment portion. The second interchangeable member is a member that does not abut against the rear surface of the face portion when the member is attached to the first attachment portion.

A golf club head according to this invention is a wood type golf club head including a face portion, a crown portion, and a sole portion. A plurality of grooves are formed in the face portion. The depth of the plurality of grooves is less than 0.025 mm. Each pitch between adjacent grooves of the plurality of grooves ranges from 0.1 mm (inclusive) to 1 mm (inclusive).

Golf club head with grooves shallower than scorelines and goove pitch and length

A golf club head having a face part, a sole part, a side part, a crown part and a hosel part, all of which surround a hollow part comprises a penetration hole that is provided on the crown part, penetrating the crown part so that the hollow part is connected with an outer atmosphere of the golf club head and a non-metal cover that is provided over the penetration hole. A recess part, which forms a recess, is provided on a surface of the non-metal cover.

Growing community of inventors

Tokyo, Japan

Tomonori Kitagawa