Double-tube vibration damper
US4768629A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Sep 18, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/49
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a double-tube vibration damper the piston acts on an abutment spring when arriving at a predetermined position during its inward stroke. The abutment spring acts on a control member. The control member cooperates with a bottom passage to reduce the cross-sectional area of the bottom passage in response to the piston starting to act onto the abutment spring such as to reduce the cross-sectional area of the bottom passage. In this way a hydraulic abutment function is obtained on inward movement of the piston rod. The control member is biased by a return spring towards the abutment spring. The abutment spring acts with its end remote from the control member onto a friction ring, which friction ring is frictionally guided by the inner face of the cylinder. The biasing action of the return spring is larger than the force necessary for moving the friction ring along the inner face of the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.