Composite gasket and fitting including same
AssigneeVassallo Research and Development Corporation
InventorJose E. Valls
Life of this patent
Estimating the term…
Abstract
A composite gasket for forming a seal between a pipe bell 52 and a spigot 58 comprises a major portion 12 of non-elastomeric plastic material and a minor portion 14 of elastomeric material. The minor portion is axially encased by the major portion. The minor portion includes a sealing lip 16 extending radially inwardly from the major portion. The composite gasket can be manually inserted within a preformed grooved bell or the grooved bell can be formed over the gasket while the gasket is mounted on a mandrel.
Claims29
A composite gasket for forming a seal between a pipe bell and a spigot, comprising:
- a major portion of non-elastomeric plastic material;
- and
- a minor portion of elastomeric material, said minor portion being axially encased by said major portion and having a first sealing lip extending from said major portion in a radial direction, said major portion including first and second segments entrapping said minor portion therebetween, said segments having interlocking sections.
A composite gasket according to claim 4 wherein said minor portion is generally T-shaped in transverse cross section with said sealing lip forming a vertical leg thereof.
A composite gasket for forming a seal between a pipe bell and a spigot, comprising:
- a major portion of non-elastomeric plastic material;
- and
- a minor portion of elastomeric material, said minor portion being axially encased by said major portion and having a first sealing lip extending from said major portion in a radial direction, said major portion including first and second segments entrapping said minor portion therebetween, said first segment having an axially extending, unitary latch member, and said second segment having a recess which mates with and positively engages said latch member.
A composite gasket for forming a seal between a pipe bell and a spigot, comprising:
- a major portion of non-elastomeric plastic material;
- and
- a minor portion of elastomeric material, said minor portion being axially encased by said major portion and having a first sealing lip extending from said major portion in a radial direction, said major portion including first and second segments entrapping said minor portion therebetween, said segments being directly bonded to form an integral member.
A pipe fitting for a plastic pipe system, comprising:
- a cylindrical body having a radially extending circumferential groove;
- a composite gasket mounted in said groove, including
- a major portion of non-elastomeric material sealed in said groove,
- a minor portion of elastomeric material, said minor portion being axially encased by said major portion and having a first sealing lip extending from said major portion in a radial direction, and
- a second elastomeric sealing lip extending from said major portion radially opposite said first sealing lip;
- and
- a circumferential notch in said groove receiving said second sealing lip.
A composite gasket for forming a seal between a pipe bell and a spigot, comprising:
- a major portion of non-elastomeric plastic material;
- and
- a minor portion of elastomeric material, said minor portion being axially encased by said major portion and having a first sealing lip extending from said major portion in a radial direction, said major portion including first and second segments entrapping said minor portion therebetween, said sealing lip extending radially inwardly, said first and second segments having first and second cylindrical inner surfaces, respectively, adjacent said sealing lip, said second inner surface having a greater diameter than said first inner surface.
A pipe fitting for a plastic pipe system, comprising:
- a cylindrical body having a radially extending circumferential groove;
- and
- a composite gasket mounted in said groove, including
- a major portion of non-elastomeric material sealed in said groove, and
- a minor portion of elastomeric material, said minor portion being axially encased by said major portion and having a first sealing lip extending from said major portion in a radial direction, said major portion including first and second segments directly contacting each other and entrapping said minor portion therebetween.
Dependencies are inferred from the claim text.