Sumitomo Rubber Industries Limited

Takeshi Iwanaga

Tetsuo Yamaguchi

Hideaki Kawamatsu

Akio Ohnishi

Takao Kurashima

An iron set comprises a plurarity of irons respectively provided with a head which is formed with a cavity in a rear surface thereto. A lower size number of irons are gradually still greater in their horizontal face length, and are gradually still smaller in thickness of their ball hitting portions which ranges between their faces and the bottoms of the cavities in their rear surfaces.

Iron (club) set

In a metallic golf club head provided with a hollow chamber portion therein, a sheet body having vibration restraining characteristics or a coating material having vibration restraining characteristics is applied to an inner surface portion of a crown portion or other similar portion which is small in thickness. The sheet body or the coating material is 0.05 or above in the loss factor thereof.

Golf club head

A metallic inner pipe for the positional adjustment of the gravitational center is inserted in a metallic shaft body from a large-diameter end aperture thereof, and this inner pipe is secured in a large-diameter end portion of the metallic shaft body. This metallic inner pipe is located in an internal area of the shaft body which ranges between 0 mm and 350 mm from the large-diameter extremety of the shaft body, while on the other hand, the metallic inner pipe is 50 mm to 350 mm in the length thereof, and is 10 g to 50 g in the weight thereof. The inner pipe is secured to the large-diameter end portion of the metallic shaft body by using adhesives or any other suitable fixing means. If the inner pipe is secured to the metallic shaft body, the outside end of the metallic inner pipe is aligned with the large-diameter end of the metallic shaft body.

Golf club shaft

The present invention provides a golf club set comprising differently numbered wood clubs and differently numbered iron clubs. The shaft of each club have reverse deflection which is defined as displacement of a standard shaft point when a predetermined load is applied to the shaft a predetermined distance from the shaft head end with the head end fixed. The reverse deflection of the wood club shafts decreases proportionally as the wood club number increases. The reverse deflection of the iron club shafts decreases progressively as the iron club number increases, and further retains proportionality relative to the proportionally decreasing reverse deflection of the wood club shafts.

Golf club set

The present invention provides an iron golf club head which comprises a core member, a striking face member and a cladding. The core member is made of a metal having a large specific weight, and has an exposed integral sole portion, an integral riser wall portion, and an integral shaft connecting portion. The striking face member is fixed to a front surface of the core riser wall portion, and made of a light metal reinforced by whiskers and/or fibers. The cladding is also made of a light metal, and covers all surfaces of the riser wall portion and the shaft connecting portion except for a surface portion of the riser wall portion on which the striking face member is fixed.

Iron gold club head and method of producing the same

An iron type golf club head having the whole or the central part of a ball striking face thereof, which directly touches a golf ball, fabricated from a material possessing a compression Young's modulus (modules of longitudinal elasticity) lower than that of steel.

Iron type golf club head

A set of golf clubs each having a fiber reinforced plastic shaft incorporating helically wound reinforcing filaments over the entire length thereof, the shaft comprising an intermediate flex section interposed between a head-side section and a grip-side section, a filament winding angle in the flex section being larger than that in the head-side and grip-side sections so that a maximum bendability is provided at the flex section, wherein location of the flex section gradually differs from club to club in the set in order of club number in a manner that any club of smaller number in the set has its flex section closer to its club head than any club of greater number in the set.

Growing community of inventors

Kobe, Japan

Takeshi Iwanaga