Yamaha Corporation

Kazuhiro Tsuchiya

Toshiharu Hoshi

Hiroyuki Yamashita

Yuma Horio

Kenzaburo Iijima

Atsushi Tsuchida

Takashi Iijima

Yoshimi Iitake

Kikuo Nishida

Katsuhiko Kosugi

A wood or iron golf club head comprising a ball-striking part and a hosel which are formed separately and joined together into an integral unit, the hosel containing microscopic pores, thus having a lower material density compared to that of the ball-striking part.

Golf club head

In production of a shell-type golf club head made up of several different pieces, an iron-type material of a specified chemical composition and carbon equivalent is subjected to a combination of annealing before shaping with quenching after shaping. Exclusion of the conventional casting process in production much improves mechanical characteristics of the product and increase mechanical strength enables formation of a large size golf club head with an enlarged sweet spot. Limited and locally specified disposition of weld lines assures highly accurate lie and loft angles with reduced welding strain.

Golf club head and a method for producing the same

In construction of a wood club head having a main body of a hollow metallic shell construction, the face thickness is limited to 2 to 4 mm and the entire head volume is limited to 190 cc or larger for enlargement of its sweet spot. The enlarged sweet spot assures a long flying distance of a ball in an intended direction through its improved mating with the ball at the very moment of striking.

Hollow metal alloy wood-type golf head

Growing community of inventors

Hamamatsu, Japan

Kazuhiro Tsuchiya