Abstract: A fiber reinforced epoxy resin article in which a Lewis base is employed as the catalyst for the addition reaction of a phenolic or alcoholic hydroxyl group and the oxirane group of the epoxy resin. The resin system has improved flexibility and pot life and the cured article has improved chemical resistance.

Abstract: A pipe made of fiberglass or the like includes a helical reinforcing member bonded to its outer surface substantially over its length with adjacent convolutions spaced with respect to each other. The reinforcing member or rib includes a filament-wound composite of a series of continuous resin impregnated glass filaments arranged in a bundle and surrounded by a helical fiber having spaced adjacent convolutions. An alternative construction further includes a core of paper or plastic or metal within the bundle to increase the rib height. An auxiliary bundle forming apparatus is employed with a filament winding machine so that the same winding machine and additional lengths of continuous glass fibers drawn from a common storage station may be utilized to form both the fiberglass pipe and the reinforcing rib. A spiral guide may also be used with the auxiliary bundle forming apparatus and the filament winding machine to add an inexpensive elongated core to the bundle forming a reinforcing rib of increased height.

Abstract: An end closure for large diameter thin wall pipe employs separate opposed outside contractible and inside expansible assemblies to grip the pipe. A separate yoke member is carried by a closure member of the inside assembly and in turn carries means to actuate a seal between the closure member and the pipe. The external contractible member assembly has a sleeve-like clamp which extends longitudinally beyond the area of the internal expansible member and seal and confines the pipe beyond said areas.

Abstract: A pipe joint make up tool for joining pipe members together including pipes and fittings and caps in which gripper half collars having a tapered rail along each facing edge are placed around a pipe and wedging clamps having complementary flanges are thereby engaged with the rails of the collars on opposite sides of the pipe. Each collar has an internal gripping surface of flexible material. The gripper collars are each provided with a hydraulic cylinder connected to a common hand pump or to other power means. Cables or chains are located diametrically opposite each other and connected to the piston of each hydraulic cylinder on the first pipe and to wedging clamps assembled on the gripper half collar disposed around the second pipe. As force is applied by the hydraulic cylinders the wedging action as the pipes are pulled together sockets one pipe into the other at the joint between them. A gauge in the hydraulic system is used as a force indicator.