Back to results
US 10,376,759 B2Granted
Golf club
AssigneeGloberide, Inc.
InventorTadashi Toya
Life of this patent
Estimating the term…
Abstract
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.
Claims4
A golf club comprising:
- a head;
- and
- a shaft made of a fiber-reinforced resin and mounted to the head,
- wherein 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 of the shaft;
- wherein a prepreg sheet for reinforcement is wound on a distal end portion of the shaft, the head being mounted to the distal end portion, and
- wherein the prepreg sheet for reinforcement has a first reinforcement sheet and a second reinforcement sheet, the first reinforcement sheet and the second reinforcement sheet being arranged in an outermost layer of the shaft, the first reinforcement sheet including reinforcing fibers oriented in crossed directions, and the second reinforcement sheet including reinforcing fibers oriented in an axial direction.
3 more elements
Dependencies are inferred from the claim text.