| CPC F16L 55/1608 (2013.01) [B29C 65/4805 (2013.01); F16L 55/18 (2013.01)] | 21 Claims |
|
1. A replacement pipe fitting assembly for rigid plastic cylindrical pipe, used in an existing length of pipe wherein use of standard slip-on solvent weld couplings to replace a section of pipe is not possible, comprising:
a replacement pipe of at least the same diameter as the existing length of pipe, each end of the replacement pipe having a first enlarged outside diameter greater than that of the existing pipe with the enlarged outside diameter being of a length of at least a prescribed socket length for solvent weld couplings of the plastic pipe, said replacement pipe being placed coaxially with the existing length of pipe where a section of existing pipe has been removed,
two sleeve bushings attached by solvent bonding to ends of the existing length of pipe, each sleeve bushing being a generally hollow cylinder having an inside surface permanently secured by solvent adhesive to an end of the existing length of pipe, and having an outside generally cylindrical surface of a second enlarged outside diameter smaller than the first enlarged outside diameter on the replacement pipe,
two generally cylindrical special couplings, one fitted loosely over each end of the existing length of pipe, each special coupling having a varying inside diameter such that with the replacement pipe positioned closely between the two ends of the existing length of pipe in a position formerly occupied by the section of pipe being replaced, each special coupling can be slid toward the replacement pipe and, with solvent adhesive applied to the outer surfaces of the replacement pipe ends and of the sleeve bushings or to the inner surface of the special coupling, or both, the special coupling can engage closely with the outer surfaces of the sleeve bushings on the existing pipe and of the ends of the replacement pipe, to permanently secure the adjacent ends of the existing length of pipe and of the replacement pipe together.
|