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Piston or rod seal

  • US 5,082,295 A
  • Filed: 11/28/1990
  • Issued: 01/21/1992
  • Est. Priority Date: 12/02/1989
  • Status: Expired due to Fees
First Claim
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1. In a cylindrical seal, comprising an annular scraper ring which is made of a PTFE material and is supported in a first cylindrical groove radially open toward a cylindrical surface of a relatively moving cylindrical machine part, the scraper ring being pressed against the relatively moving machine part by means of an O-ring made of an elastomeric material and supported on the bottom of the first groove, wherein the scraper ring, on the side facing the relatively moving machine part, has at least two sealing edges defining respective radial planes and being separated by a second groove with a radial depth T and wherein, on the side facing the O-ring, the scraper ring has a conical surface with an external diameter which increases axially in a direction toward the side facing away from pressure to be sealed, the improvement wherein the second groove has a rounded bottom with a radius R which is approximately equal to the radial depth T of the second groove and wherein the conical surface is a continuous surface that overlaps at least the radial planes of the sealing edges.

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