| Patent application number | Description | Published |
|---|
| 20080200279 | Iron-type golf club and FRP shaft therefor - A club shaft for an iron-type golf club is made of a fiber reinforced resin. The weight W of the club shaft per 39 inches is not less than 30 grams and not more than 60 grams. The average bending rigidity EIa of the club shaft is not more than 5.0 kgf sq.m. An expression (1) EIa>=0.05 W+2.0 is satisfied. Preferably, an expression (2) EIa>=0.05 W+2.5 is satisfied. More preferably, an expression (3) EIa>=(1/15)W+2.0 is satisfied. Even if golfers can not make powerful swings through the swing speed is high, the carry distance and the directionality of the hit ball can be improved. | 08-21-2008 |
| 20080200280 | Iron-type golf club and FRP shaft therefor - A club shaft for an iron-type golf club is made of a fiber reinforced resin. The weight W of the club shaft per 39 inches is not less than 55 grams and not more than 95 grams. The average bending rigidity EIa of the club shaft is not more than 1.5 kgf sq.m. An expression (1) EIa=<0.05W−1.25 is satisfied. Preferably, an expression (2) EIa=<0.05W−1.75 is satisfied. More preferably, an expression (3) EIa>=0.1W−6.5 is satisfied. Even if golfers are weak in flexing the club shafts though the golf swings are powerful, the carry distance can be increased. | 08-21-2008 |
| 20090098324 | Tubular body manufacturing method and tubular body - The present invention relates to a method of manufacturing an FRP tubular body. The manufacturing method includes the steps of winding a fiber reinforced resin member containing a fiber and a matrix resin around a mandrel, thereby obtaining an intermediate formed body, winding a wrapping tape around an outer peripheral surface of the intermediate formed body ( | 04-16-2009 |
| 20100260955 | TUBULAR BODY AND MANUFACTURING METHOD THEREOF - A manufacturing method of the present invention includes the steps of: winding a fiber reinforced resin member containing a fiber and a matrix resin around a mandrel to obtain an intermediate formed body; winding a wrapping tape around the intermediate formed body with an application of a tension; heating the intermediate formed body to cure the matrix resin; and pulling the mandrel out and removing the wrapping tape after the step of heating to obtain a cured tubular body. A base polymer of a base material of the wrapping tape is a polyolefin resin and/or a polyester resin. The step of heating includes: a first heating stage for heating the intermediate formed body at a temperature of 70° C. or higher and 90° C. or lower for a time of 120 minutes or longer and 4320 minutes or shorter; and a second heating stage for heating the intermediate formed body at a temperature of 120° C. or higher and 200° C. or lower for a time of 5 minutes or longer and 20 minutes or shorter after the first heating stage. | 10-14-2010 |
| 20110130214 | METHOD FOR DESIGNING GOLF CLUB AND GOLF CLUB - A designing method of the present invention includes the steps of: measuring a golf swing to obtain a measured result; obtaining a swing model provided with a link model and joint torque data based on the measured result, the link model having at least two links; performing simulation for swing the golf club using the swing model; and obtaining head information in a specific situation during a swing based on a result of the simulation. In the designing method, a plurality of specifications of the golf club and/or the plurality of swing models are used to obtain the plurality of head information, and stability is evaluated using a difference between the head information. In the designing method, it was found that a great lateral moment of inertia of a head and a small depth of a center of gravity of the head contribute to the stability. | 06-02-2011 |
| 20110300959 | GOLF CLUB FITTING METHOD, DEVICE THEREOF, AND ANALYSIS METHOD - The analysis method includes steps of acquiring measurement data obtained from swings and values of hitting results (flight distance or the like) (STEP | 12-08-2011 |
| 20120108363 | METHOD FOR SELECTING GOLF CLUB - The fitting method includes a step of preparing a relationship C in which a face angle at or before impact and a hitting result are considered when a plurality of golf players swing using a plurality of golf clubs with different head physical property values; a step of obtaining measurement result of the face angle by a subject (golf player) hitting a ball with a test club; and a step of determining a head physical property fitted to the subject on the basis of the relationship C and the measurement result of the face angle. Preferably, the relationship C is a relational expression F | 05-03-2012 |
| 20120108364 | METHOD FOR FITTING GOLF CLUB - A fitting method according to the present invention includes steps of preparing a relationship C of a shaft flex point Y and a face angle X before impact or at impact; measuring a subject's face angle X before impact or at impact by using a test club; and selecting a shaft fitted to the subject on the basis of the measured face angle X and the relationship C. The relationship C is created by using correlation R of the face angle before impact or at impact and a hitting result. The correlation R is based on hitting results of a plurality of golf clubs having different shaft flex point rates. Preferably, the relationship C is a relational expression F | 05-03-2012 |
