Step lock piston ring insert

  • US 5,934,685 A
  • Filed: 07/14/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 07/14/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A stepped piston ring seal comprising resilient material surrounding a longitudinal axis, an inner diameter about said axis, an outer diameter about said axis, and an intermediate diameter about said axis that is greater than the inner diameter and less than the outer diameter, a thickness between said inner and outer diameters, and a depth extending parallel to said axis, said ring seal further comprising first and second mating surfaces extending between said inner and outer diameters and across said depth, each of said first and second mating surfaces being stepped across said depth, thereby defining first and second complementary, overlapping pairs of adjacent, circumferentially-extended and circumferentially-recessed ring seal end portions, each circumferentially-extended portion of said first pair being received by an apposed, circumferentially-recessed portion of said second pair and of equal circumferential length, each mating surface along the circumferentially-extended ring seal end portion being progressively and curvilinearly deviated through a first arc from a first, substantially circumferential direction starting at the inner diameter to a first radial direction at the intermediate diameter, and each mating surface along the circumferentially-recessed portion thereof being likewise curvilinearly deviated through a second arc, but from a second, opposite, substantially circumferential direction, to a second radial direction.

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