Hydraulic shock absorber
US4453638A · kind A · utility
30Cited by
2References
10Claims
0Family size
Inventor
Key dates
| Filing date | Sep 27, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Sep 27, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/446
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic shock absorber comprising a piston and hollow piston rod slidable within a cylinder, and a plug assembly including a spool valve for metering fluid into the piston rod when an impact force forces the piston into the cylinder. A coil spring normally biases the valve spool to block fluid passage. An adjustment rod is threaded into the plug assembly to form a seat for the valve spring, and extends through the hollow piston rod. The adjustment rod may be rotated from externally of the piston rod for varying spring bias on the valve spool. A closed cell sponge is disposed within the plug-remote end of the piston rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.