Patent ID: 6334517
Filing Date: 2002-01-01
Classification: F16F

Abstract:
An adjustment device for a hydraulic shock absorber having a cylinder and a piston in said cylinder and an oil reservoir, comprising:a head for connection to the shock absorber cylinder and having a cavity and a linearly extending duct enabling oil circulation between the shock absorber and the reservoir; adjustment means for each of respective high and low shock absorber piston displacement speeds; said low speed adjustment means and said high speed adjustment means in part defining first and second paths for flowing shock absorber oil to the reservoir as a function of the displacement speed of the shock absorber piston during low and high speeds, respectively; said high speed adjustment means including a first screw, a compression valve slidable coaxially on a first end portion of said first screw for axial displacement therealong and a spring carried by said first screw for biasing said compression valve for movement away from said first screw such that said compression valve in part defines said second oil path; said low speed adjustment means including a second screw having a needle coaxially disposed within a bore of said first screw, said bore including a first section having a first dimension exceeding a first dimension of the second screw, a second section having a second dimension smaller than the dimension of the second screw, said first and second sections being connected through a third section having a shape complementary to the shape of the needle of the second screw; said first screw and said compression valve having passages in communication with one another to in part define said first path.