Patent ID: 7066307

Claim:
A hydraulic dashpot for motor vehicles, comprising: a primary piston and a cylinder charged with shock absorption fluid; a piston rod with a lower end mounting said primary piston, said primary piston partitioning said cylinder into two chambers, said piston rod traveling axially into and out of said cylinder; said primary piston having breaches; shock-absorption valves for varying the cross-section of said breaches; a bypass system having at least two mutually dependently-controlled parallel bypasses between said two chambers, said two mutually dependently-controlled bypasses between said two chambers being operable simultaneously at each instant of time; said bypass system being closeable and openable by various extents by controls in form of a slide having a flow-control breach and traveling back and forth across said at least two bypasses extending adjacent through said slide; said slide regulating varying continuously flow resistances in said two bypasses; each bypass having a separate breach; and a secondary piston hydraulically received in one of said bypasses and having passive damping valves for damping fluid flow through said one of said bypasses, said secondary piston being hydraulically operable only with said one of said bypasses.