Attenuation coefficient switching type hydraulic damper
US7143875B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2003 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Feb 5, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H9/028
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic damper used for reducing shaking of a structure, for example in an earthquake. The hydraulic damper has a cylinder, a piston movable in a reciprocating manner within the cylinder, hydraulic chambers at opposite sides of the piston, and a single on-off control valve. There is a passage for connecting both of the hydraulic chambers and is on-off controlled to change a damping coefficient. A damping coefficient switching-type hydraulic damper is provided between a piston rod and the on-off control valve. A first damping coefficient is attained when the on-off control valve is maintained in a closed state for movement of said piston in one direction, and a second damping coefficient is attained when the on-off control valve is opened. A mechanical drive for the control valve may be a straight gear operatively attached to the piston rod of the cylinder, and a crank mechanism that works with the straight gear to on-off control the control valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.