Patent ID: 6974160
Filing Date: 2005-12-13
Classification: F16L,Y10S

Abstract:
1. A self-restrained pressure gasket for insertion within an annular groove provided in a bell end opening of a female pipe capable of both joining and sealing the female plastic pipe to a mating male pipe having an interior surface and an exterior surface, the bell end defining an end face at the opening, gasket comprising: an annular gasket body made of a resilient elastomeric material, the annular gasket body having an inner circumferential region and an outer circumferential region, wherein an end of the gasket body lies substantially at the end face at the opening; a hardened ring located within the material of the gasket body so that the ring is at least partially embedded within the resilient elastomeric material, the hardened ring having an inner circumferential surface, an outer circumferential surface, front and rear end faces and opposing sides, the hardened ring having a single slit at one circumferential location to allow for expansion and contraction of the ring; at least one row of teeth located on the inner circumferential surface of the hardened ring for engaging selected points on the exterior surface of the mating male plastic pipe.