Abstract: A sweep ell production apparatus (10) receives extruded plastic pipe (98) from an extruder (96). The plastic pipe (98) is passed through a curved sizing sleeve (100) which imparts a curvature to the plastic pipe (98) while at the same time sizing the pipe wall thicknesses and exterior diameter. After the pipe (98) passes through the sizing sleeve (100) a clamp (84) is secured about the periphery of the pipe (98). The clamp (84) is driven by means of a motor (34) which causes the clamp (84) to travel along an arc (112) which corresponds with the radius of curvature of the sizing sleeve (100). As the clamp (84) draws pipe (98) along the arc (112) of travel, the pipe (98) is set to have the desired radius of curvature. After a selected arc length of pipe (98) is produced, the pipe section is cut to produce the desired sweep ell.

Abstract: A sweep ell production apparatus (10) receives extruded plastic pipe (98) from an extruder (96). The plastic pipe (98) is passed through a curved sizing sleeve (100) which imparts a curvature to the plastic pipe (98) while at the same time sizing the pipe wall thicknesses and exterior diameter. After the pipe (98) passes through the sizing sleeve (100) a clamp (84) is secured about the periphery of the pipe (98). The clamp (84) is driven by means of a motor (34) which causes the clamp (84) to travel along an arc (112) which corresponds with the radius of curvature of the sizing sleeve (100). As the clamp (84) draws pipe (98) along the arc (112) of travel, the pipe (98) is set to have the desired radius of curvature. After a selected arc length of pipe (98) is produced, the pipe section is cut to produce the desired sweep ell.

Abstract: A compressor valve for use in a piston type compressor having an annular tapered shaped valve element spring-urged into a valve seat formed between the intake suction side of the valve body and an annular passage formed behind the seat which communicates with a central outlet passage formed in the exhaust side of the valve body. The piston in a compressor adapted to force fluid back through a plurality of inlet passages communicating with an annular passage which communicates with outlets in the valve body, said plurality of inlet passages being sealed by a spring-urged annular valve element. The piston sucks air into the inlet urging the first annular valve element off its seat to allow flow of the gas in through the outlet passage into the piston chamber. The piston then forces the air through the plurality of inlet passages urging the second valve element off its seat such that the gas flows around both the inner and outer sides of the valve element to the outlet of the compressor.

Abstract: A pipe cut off saw comprising a pipe cradle and a cutting means pivotally secured adjacent said pipe cradle such that the pivot point is aligned with the center line of the pipe so that the cutting means may be rotated about the pipe to cut off the end of the pipe. The pipe cradle has elevating apparatus to change the angle of the center line relative to the pivot point of the saw to permit miter cuts on the pipe.

Abstract: Disclosed is a method and apparatus for forming a joint in a confined space between two abutting ends of conduit liners. In the method, an excavation is formed to provide access to a buried conduit. Thereafter, the conduit is opened and cleaned of debris and elongated sections of conduit liner are inserted through the opening into the conduit in opposite directions from the opening. Once insertion is completed, a sleeve is positioned concentrically around one of the conduit section ends. The ends of the sections are positioned in an abutting coaxial relationship and are aligned and attached together by tape. The sleeve is then moved to a position overlapping the intersection of the two sections and the annular space between the sleeve and the exterior of the conduit sections is closed by sealing with foam rubber stripping constrained by tape. A polyurethane material is injected through a port in the sleeve to fill the annular space. Thereafter, the polyurethane material is allowed to set.

Abstract: Disclosed is a method and apparatus for repairing a buried main having connected lateral service conduits. In the method, a main is opened and cleaned of debris. Thereafter, an elongated conduit liner is axially inserted into a length of the buried main. The lateral service conduits are opened and cleaned from a point remote from their connection to the main. A dispenser is axially inserted through the service conduit to a point adjacent to the connection. At the connection, polyurethane material is dispensed into a portion of the service conduit and in the annular space between the main and the liner. Thereafter, the dispenser means is removed from the service conduit and the polyurethane material is allowed to set. A cutter apparatus is axially inserted into the service conduit and is manipulated to form a port through the polyurethane material and the wall of the liner to connect the service conduit to the liner.

Abstract: Disclosed is a method and apparatus for repairing a buried main having connected lateral service conduits. In the method, a main is opened and cleaned of debris. Thereafter, an elongated conduit liner is axially inserted into a length of the buried main. The lateral service conduits are opened and cleaned from a point remote from their connection to the main. A dispenser is axially inserted through the service conduit to a point adjacent to the connection. At the connection, polyurethane material is dispensed into a portion of the service conduit and in the annular space between the main and the liner. Thereafter, the dispenser means is removed from the service conduit and the polyurethane material is allowed to set. A cutter apparatus is axially inserted into the service conduit and is manipulated to form a port through the polyurethane material and the wall of the liner to connect the service conduit to the liner.