Variable rate shock absorber
US5027927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1990 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | May 29, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/46
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A variable rate shock absorber comprising a tubular working cylinder (10) destined to be mounted on a suspended part of a vehicle, a piston rod assembly (24) slidably received in the working cylinder (10) and having an end (34) destined to be mounted on a fixed part of a vehicle, the piston rod assembly (24) having at its free end a piston member (48) cooperating with the working cylinder (10) to divide the interior thereof into an upper (44) and a lower working chamber (56), a valve mechanism in the piston member (48) to permit controlled two-way flow between the upper and lower working chambers an electro-magnetic valve mechanism (62) disposed between the upper working chamber (44) and a reservoir (18) and selectively actuatable to allow fluid flow therebetween, the valve mechanism (62) comprising a first member (80, 114) slidably mounted with respect to a second member (72, 116) between a closed position and an open position, characterized in that the first member (80, 114) is movable into at least one partially open position, the position defined by at least one stepped valve surface (94, 100, 126) formed on one member (80, 116).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.