One object is to provide a golf club equipped with a shaft made of FRP, the golf club being excellent in swing feeling and ball-hitting feeling and capable of stabilizing directional accuracy in ball hitting. The golf club according to the present invention is characterized in that it includes a shaft made of a fiber-reinforced resin mounted to a head, and the shaft is formed so that a variation of a ratio between torsional rigidity and bending rigidity (GIp/EI) is 0.2 or less over an entire length thereof.

A golf putter is provided having a center core which extends through the putter head, the shaft, and into the grip. The center core not only acts as the backbone of the putter, the center core extends to the outer edges of putter and thus determines the shape of the putter. Additional parts necessary for a complete putter such as the putter head, shaft, and grip are attached to the center core to form a functional putter.

Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a hollow body portion having a front portion, a rear portion, a toe portion, a heel portion, a bottom portion, a top portion with a crown portion having an opening, and a cover portion configured to couple to the crown portion to cover the opening. Other examples and embodiments may be described and claimed.

A golf club including at least one component with a construction that includes a composite material with color/metallic coated fibers. In some embodiments, at least a portion of an outer surface of the golf club head is defined by a layered structure including color/metallic coated fibers. The layered structure may include a non-woven composite layer comprising a plurality of unidirectional fiber composite plies and woven composite layer disposed over the non-woven fiber composite layer and including color/metallic coated fibers. In some embodiments, an optically transparent coating may be disposed over the woven composite layer. In some embodiments, the color/metallic coated fibers may be electroplated fibers.

A metal foil satisfies following conditional equations (1), (2) and (3) to smoothly increase rigidity in the longitudinal direction of the shaft main body from a distal end side to a base end side while increasing a weight of a wound part of the metal foil

0.50<Lmf/Ls (1)

Lmr/Ls<0.90 (2)

0.03<Wm/Ws<0.09 (3) where Lmf: a length from a distal end position in the longitudinal direction of the shaft main body to a winding start position of the metal foil, Lmr: a length from the distal end position in the longitudinal direction of the shaft main body to a winding end position of the metal foil, Ls: a length of the shaft main body, Wm: a weight of the metal foil, and Ws: a weight of the shaft main body.

One object is to provide a golf club equipped with a shaft made of FRP, the golf club being excellent in swing feeling and ball-hitting feeling and capable of stabilizing directional accuracy in ball hitting. The golf club according to the present invention is characterized in that it includes a shaft made of a fiber-reinforced resin mounted to a head, and the shaft is formed so that a variation of a ratio between torsional rigidity and bending rigidity (GIp/EI) is 0.2 or less over an entire length thereof.

Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a hollow body portion having a front portion, a rear portion, a toe portion, a heel portion, a bottom portion, a top portion with a crown portion having an opening, and a cover portion configured to couple to the crown portion to cover the opening. Other examples and embodiments may be described and claimed.

A golf club and golf club shaft includes a tubular member having at least one neck portion with a reduced outer diameter and at least one relatively rigid two-piece sleeve secured to the tubular member in overlying relationship to each neck portion. The two-piece sleeve defines a small central gap filled by a compressible ring to allow the two otherwise longitudinally aligned sleeve pieces to pivot relative to one another under dynamic loading of the tubular member during a golf swing, and then upon reaching a limit point restrict additional deflection or bending of the tubular member.

Disclosed golf club heads include a body defining an interior cavity, a face, a sole, a crown, and a hosel. Certain embodiments include a weight channel positioned in the sole and defining a path along the sole. Some embodiments include a weight member positioned in the weight channel that is configured to be adjusted to any of a range of selectable positions to adjust mass properties of the golf club head. A fastener may be configured to secure the weight member in any of the selectable positions, while the fastener itself, regardless of where the weight member is positioned along the path, may be secured to the body at a fixed location that is independent of the position of the weight member along the path. Additional mass elements may be added to the weight member, such as at its ends, to further adjust mass properties of the golf club head.

Disclosed golf club heads include a body defining an interior cavity, a face, a sole, a crown, and a hosel. Certain embodiments include a weight channel positioned in the sole and defining a path along the sole. Some embodiments include a weight member positioned in the weight channel that is configured to be adjusted to any of a range of selectable positions to adjust mass properties of the golf club head. A fastener may be configured to secure the weight member in any of the selectable positions, while the fastener itself, regardless of where the weight member is positioned along the path, may be secured to the body at a fixed location that is independent of the position of the weight member along the path. Additional mass elements may be added to the weight member, such as at its ends, to further adjust mass properties of the golf club head.