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US 4,379,558 AGranted
Anti-extrusion packing member
AssigneeUtex Industries, Inc.
InventorFred B. Pippert
Life of this patent
Estimating the term…
Abstract
A seal or packing for use in dynamic or static applications subject to stretching, twisting or deforming forces, includes a body member forming the sealing and packing surfaces, together with an anti-extrusion reinforcing element incorporated in the body member. The anti-extrusion element is comprised of a helical round wire spring axially centered within a covering of an overlapping flat wire helical spring. The anti-extrusion elements are bounded or integrally joined to the body member at or near those locations thereon where extruding forces are likely to act.
Claims6
A packing comprising:
- an extrudable body member having at least one sealing surface thereon;
- and
- anti-extrusion means incorporated in said body member to form a reinforced portion of said body member;
- said anti-extrusion means serving to resist extrusion forces acting on said body member in the area contiguous to said reinforced portion, said anti-extrusion means being comprised of a flat helical spring with adjacent helical spring segments overlapping to form a tubular shell.
1 more element
Dependencies are inferred from the claim text.