Damper device

Details Damper device Damper device

2007-10-02

2007-10-02

Nguyen, Xuan Lan (Department: 3683)

Brakes

Internal-resistance motion retarder

Using a rotary-type fluid damper

C016S054000

Reexamination Certificate

active

10523049

ABSTRACT:
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.

REFERENCES:
patent: 5064033 (1991-11-01), Koike et al.
patent: 5111548 (1992-05-01), Ohshima
patent: 5165506 (1992-11-01), Guimbretiere
patent: 5305858 (1994-04-01), Haga et al.
patent: 6121526 (2000-09-01), Kobori et al.
patent: 5-41499 (1993-06-01), None
patent: 5-296267 (1993-11-01), None
patent: 6-40485 (1994-05-01), None

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