Somar Corporation

Toshiyuki Arisato

Masatoyo Okitsu

Katsuji Kitagawa

Masao Kubo

Toshio Mitsuyasu

A metal bat for use in baseball is disclosed which includes a tubular metal body having an impact portion for hitting a ball, and a layer of a resin foam provided on and bonded to the inside wall of the impact portion and having a density of 0.05-0.5 g/cm.sup.3.

Metal bat for use in baseball

A boom for a boardsailing is formed of two bodies, intermediate pipes, end pipes, a front coupler and a rear coupler. The bodies and pipes are non-metallic synthetic resin pipe reinforced by fiber layers, including a synthetic fiber layer and at least one carbon fiber layer. The portions of said bodies, intermediate pipes and end pipes which are used for interconnecting with the couplers and with each other are further reinforced by a reinforcing synthetic resin layer which is reinforced by a reinforcing fiber layer. The reinforcing fiber layer includes fine fibers oriented in at least two mutually different directions and having diameters of 20 .mu.m or less.

Boom for boardsailing

A surfing boom comprising a pipe of synthetic resin having a density of 1.4-1.6 g/cm.sup.3. The pipe is reinforced by a plurality of carbon fiber layers. In a first carbon fiber layer, fibers are oriented within an angle of 60.degree.-90.degree. to an axial direction of the boom. In a second carbon fiber layer, fibers are oriented within an angle of 30.degree. to the axial direction of boom.

Growing community of inventors

Tokyo, Japan

Toshiyuki Arisato