Toto Ltd.

Naohisa Tanaka

Ryosuke Hayashi

Satoshi Kato

Yoshiro Terada

Eiji Fukuzawa

Takayuki Tomura

Seiichiro Inoue

A damper device includes a check valve operated to apply braking force to a rotary shaft having wing portions when rotated in a cylinder in one direction and, when the rotary shaft is rotated in the opposite direction, the check valve is not operated. Movement restricting flow passages for restricting the movement of a viscous fluid between front and rear-side oil chambers divided by the wing portions are formed between an inner wall of the cylinder and the wing portions, and a selective communication passage having the check valve is formed between the wing portions and one of two side walls forming the oil chambers, such that the side wall and the check valve can be rotated along with the rotation of the wing portions, thereby avoiding rotation of the check valve in contact with the inner wall of the cylinder, for pronged service life of the damper device.

Growing community of inventors

Miyako-gun, Japan

Naohisa Tanaka