Patent ID: 8074996

Claim:
A pipe sealing gasket designed for receipt within a groove provided within a socket end of a thermoplastic pipe, the gasket comprising: a ring shaped elastomeric body which, when viewed in cross section, has a central bulbous region formed of a suitable elastomer, the central bulbous region having located therein a planar angled region which bisects the bulbous region at a selected radial location and which extends outwardly from the central region to form a pair of oppositely arranged wing-like flaps, the planar angled region being formed of a dissimilar plastic material; wherein the central bulbous region forms an oval profile when viewed in cross section, the oval profile having an outer surface region which is adapted to seat within the groove provided in the socket end of a thermoplastic pipe, the oval profile also having an inner surface region which forms a compression seal region for a mating spigot end of a mating thermoplastic pipe during insertion of the spigot end within the mating socket end of the thermoplastic pipe; and wherein the oppositely arranged wing-like flaps which extend outwardly from the central bulbous region form a V-shaped cavity bounded by a leading and a trailing flap, which cavity receives the inner surface region of the central bulbous region of the gasket, and wherein the leading flap has an outer edge which makes contact with the spigot pipe end during insertion and wipes any dirt present from the spigot end, keeping the dirt from reaching the cavity and the inner surface region which forms a compression seal region for sealing against the spigot end.