Patent ID: 6868947
Filing Date: 2005-03-22
Classification: F16F

Abstract:
1. A piston for a hydraulic dashpot, comprising: a piston head mounted on one end of a piston rod traveling back and forth inside a cylinder divided into two chambers; said piston head having axial channels, each of said channels being openable and closable at an end by a one-way valve in form of cup spring means; means for independently adjusting tensions of said cup spring means for both compression and suction phases, said cup spring means resting against said piston head and aligned with said piston head, said tensions being adjusted by deforming said cup spring means resiliently or plasticly against a contact surface of said piston head for varying hydraulic impedances of said compression and suction phases; said piston having a characteristic curve adjustable in both compression and suction phases, said piston head comprising a central bolt having a continuous collar; and two piston halves resting axially against the collar; said bolt being fixed to said collar; said collar having two faces abutted by said two piston halves; said piston halves having to be pushed over said bolt from opposite ends of said bolt in mounting said piston halves on said bolt so that said bolt is fastenable only thereafter to said piston rod.