Pipe assemblies

Claim 2

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in saiD channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member being of substantially circular cross section, the shape of the inner faces of said coupling member providing said channel with the form of a V-shaped groove, said linings being in contact with each other, and said sealing member being wedged between said groove and said folded-back portions.

Claim 3

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shed shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in said channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member being of substantially triangular cross section, the shape of the inner faces of said coupling members providing said channel with the form of a V-shaped groove which engages with two of the sides of said triangle, the other side of said triangle lying on said folded-back portions of said linings, said linings being in contact with each other.

Claim 4

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shed shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in said channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member being of substantially triangular cross section, the shape of the inner faces of said coupling members providing said channel with the form of a V-shaped groove which engages with two of the sides of said triangle, the other side of said triangle lying on said folded-back portions of said linings, said linings being in contact with each other.

Claim 5

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in said channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member comprising two annular components, one of said components lying in the part of said channel provided by one of said coupling members, the other of said components lying in the part of said channel provided by the other of said coupling members, said components holding said elastomer linings apart from each other by virtue of each of said components having an end projecting from its coupling member, said projecting ends being in sealing contact with each other, said components having a frustotriangular cross section which is cut away on its outer surface at said projecting end so that it is not urged outwardly between said coupling members and cut away on its inner surface in the part thereof nearest the curved end portion of the respective lining so that no pressure is exerted on said curved end portion.

Claim 6

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in said channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member comprising two annular components, one of said components lying in the part of said channel provided by one of said coupling members, the other of said components lying in the part of said channel provided by the other of said coupling members, said components holding said elastomer linings apart from each other by virtue of each of said components having an end projecting from its coupling member, said projecting ends being in sealing contact with each other, said components having a frustotriangular cross section which is cut away on its outer surface at said projecting end so that it is not urged outwardly between said coupling members and cut away on its inner surface in the part thereof nearest the curved end portion of the respective lining so that no pressure is exerted on said curved end portion.

Claim 7

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in said channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member comprising two annular components, one of said components lying in the part of said channel provided by one of said coupling members, the other of said components lying in the part of said channel provided by the other of said coupling member, said components holding said elAstomer linings apart from each other by virtue of each of said components having an end projecting from its coupling member, said projecting ends being in sealing contact with each other, each of said components comprising a first annular element of substantially rectangular cross section and a second element of substantially U-shaped cross section said U-shaped cross section comprising two legs and a base joining said legs, in which said first element is housed, one of said legs having an integral flanged part substantially at right angles to it, said integral flanged part projecting from the respective coupling member and outwardly between the two said coupling members said first element having an end projecting from the respective coupling member, the two integral flanged parts being in contact with each other and the two projecting ends being in contact with each other inducing lateral forces between said first elements and pushing each of them into contact with said base and said legs of the respective second element.

Claim 8

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around said adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, an annular sealing member lying in said channel, said coupling members being held together and pressing said sealing member in fluidtight sealing relationship against the folded-back portions of said elastomer linings, said sealing member comprising two annular components, one of said components lying in the part of said channel provided by one of said coupling members, the other of said components lying in the part of said channel provided by the other of said coupling member, said components holding said elAstomer linings apart from each other by virtue of each of said components having an end projecting from its coupling member, said projecting ends being in sealing contact with each other, each of said components comprising a first annular element of substantially rectangular cross section and a second element of substantially U-shaped cross section said U-shaped cross section comprising two legs and a base joining said legs, in which said first element is housed, one of said legs having an integral flanged part substantially at right angles to it, said integral flanged part projecting from the respective coupling member and outwardly between the two said coupling members said first element having an end projecting from the respective coupling member, the two integral flanged parts being in contact with each other and the two projecting ends being in contact with each other inducing lateral forces between said first elements and pushing each of them into contact with said base and said legs of the respective second element.

Claim 9

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around the adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, and an annular sealing member lying in said channel, said sealing member comprising two annular components lying respectively in the coupling members, each of the components having a convex surface which in the undeformed condition projects from the respective coupling member, the respective coupling member having a mating face substantially aligned with the inner and outer limits of the said convex surface, the mating faces of the coupling members being held together whereby the convex surfaces of said annular components are deformed and pressed into fluidtight sealing contact with each other and said annular components are pressed into fluidtight sealing contact, with the folded-back portion of the respective elastomer lining.

Claim 10

A pipe assembly comprising two lengths of pipe, said pipe comprising an outer shell and an elastomer lining bonded to said shell, said lengths having adjacent ends and being coupled together at said adjacent ends, each of said lengths having an elastomer lining which extends around the adjacent end and folds back in a snug fit over said outer shell, and carrying a dished coupling member, the two coupling members together providing a channel between them, and an annular sealing member lying in said channel, said sealing member comprising two annular components lying respectively in the coupling members, each of the components having a convex surface which in the undeformed condition projects from the respective coupling member, the respective coupling member having a mating face substantially aligned with the inner and outer limits of the said convex surface, the mating faces of the coupling members being held together whereby the convex surfaces of said annular components are deformed and pressed into fluidtight sealing contact with each other and said annular components are pressed into fluidtight sealing contact, with the folded-back portion of the respective elastomer lining.