Damper device
US7275626B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2003 |
| Grant date | Oct 2, 2007 |
| Priority date | — |
| Expiry date | Jan 24, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47K13/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.