Abstract A reinforced flexible pipe comprises a tubular wall formed of a soft synthetic material, and a reinforcing spiral core of a hard synthetic resin material. The reinforced spiral core has a substantially I-shaped section and is partly exposed out of the pipe wall. The pipe is constructed by welding the adjoining lateral edges of an elongated strip in abutting relation, the strip being formed of a soft synthetic material and of a reinforcing spiral core of a hard synthetic resin material having a substantially I-shaped section and being partly exposed out of the strip. The apparatus comprises an endless belt obliquely wound around a mandrel at an angle substantially equal to a pitch angle of the reinforcing spiral of the hard synthetic resin material. The strip is fed in a tangential direction onto the endless belt and moved axially forwardly on the endless belt at the constant pitch angle as the endless belt is rotated around the mandrel.
A reinforced flexible pipe comprising a tubular wall formed of a soft synthetic resin material, and a reinforcing spiral core of a hard synthetic resin material having a substantially Ishaped cross-section and extending throughout the length of said pipe, partly exposed out of said wall and intimately bonded thereto, the adjoining lateral edges of an elongated strip being welded together in abutting relation so as to integrally form said wall, said strip being formed of a soft synthetic resin material and of a reinforcing hard synthetic resin material core extending throughout the length of said strip and having a substantially I-shaped cross-section and being partly exposed out of said strip.
Claim 2
Dependent Claim
110 words
A reinforced flexible pipe comprising a tubular wall formed of a soft synthetic resin material, and a reinforcing spiral core of a hard synthetic resin material having a substantially Ishaped cross-section and extending throughout the length of said pipe, partly exposed out of said wall and intimately bonded thereto, the adjoining lateral edges of an elongated strip being welded together in abutting relation so as to integrally form said wall, said strip being formed of a soft synthetic resin material and of a reinforcing hard synthetic resin material core extending throughout the length of said strip and having a substantially I-shaped cross-section and being partly exposed out of said strip.
Claim 3
Dependent Claim
22 words
A reinforced flexible pipe according to claim 1, wherein said hard synthetic material and said soft synthetic resin material comprise vinyl chloride.
Claim 4
Dependent Claim
22 words
The reinforced flexible pipe of claim 1, wherein the I-shaped cross-sectioned material is exposed only on the exterior of the pipe wall.
Claim 5
Dependent Claim
30 words
The reinforced flexible pipe of claim 1, wherein the I-shaped cross-sectioned material is exposed on the exterior of the pipe wall, and contiguous the interior surface of the pipe wall.