Sealing rings

Abstract

One aspect of the invention provides an O-ring having a cross-section including projections on opposite sides of the O-ring such that pressure applied to the projections causes expansion of the O-ring in a direction orthogonal to the applied pressure. The O-ring includes: an elastomeric core; and a non-elastomeric coating on the elastomeric core. Another aspect of the invention provides a hollow O-ring having a hollow cross-section including: first and second rigid portions on opposite sides of the cross-section of the hollow O-ring; and first and second flexible portions connecting the first and second rigid portions to form the hollow O-ring. The hollow O-ring is configured to provide a seal between outward-facing surfaces of the first and second rigid portions of the O-ring and opposing external surfaces. The flexible portions are configured to flex to limit the pressure applied by the rigid portions to the opposing external surfaces.

Dependencies are inferred from the claim text.