Hydraulic damper
US4596320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1984 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | May 18, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/462
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic damper includes a cylinder containing hydraulic fluid therein, a piston working in the cylinder and partitioning the interior thereof into two liquid chambers, a piston rod connected to the piston and extending through one of the liquid chambers to project to the outside of the cylinder, and disc valves provided on opposite sides of the piston for generating damping force both in the extension and contraction strokes of the damper. A liquid passage is formed in the piston rod to communicate the two liquid chambers separately from the disc valves. An adjusting member is provided in the liquid passage and is displaceable between three or more adjusting positions for changing the effective area thereof. A digital encoder connected to the adjusting member for detecting the adjusting positions. The digital encoder includes a common electric line which ON-OFF controls at least two other electric lines when the other two lines generate the same digital signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.