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Hydraulic shock absorber

  • US 4,044,865 A
  • Filed: 05/25/1976
  • Issued: 08/30/1977
  • Est. Priority Date: 05/25/1976
  • Status: Expired due to Term
First Claim
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1. A hydraulic shock absorber comprising a cylinder, a movable piston within said cylinder, a liquid receptacle outside the cylinder, at least one cylinder chamber within said cylinder and in communication with said receptacle through at least one narrow opening in the wall of said cylinder, said opening serving to damp the movement of the piston due to its resistance against the outflow of the liquid from the cylinder chamber, a sleeve enclosing said cylinder and having an internal thread having a slot which constitutes at least a part of said liquid receptacle, said thread having a crest which engages the cylinder wall, whereby a change of the damping power is obtained by rotating the sleeve and the cylinder in relation to each other, so that the crest of the thread will more or less cover the cross-section area of the opening for the flow of liquid.

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