Abstract: A gasketed pipe joint including a dual-functional, composite gasket, which in addition to forming a seal between a pipe bell and a spigot provides a molding surface for forming a bent retainer in the hub of the pipe or fitting. The dual-functional composite gasket comprises a first axially disposed portion formed of a non-elastomeric, substantially rigid, substantially non-resilient plastic material and has a first leading edge and a first trailing edge, and a second axially disposed portion, adjacent the first axially disposed portion, formed of an elastomeric material. Preferably, the gasket comprises a major portion of the non-elastomeric, substantially rigid, substantially non-resilient plastic and a minor portion of the elastomeric material.

Abstract: A composite gasket for forming a seal between a pipe bell and a spigot comprises a first axially disposed portion formed of an elastomeric material and has a first leading edge and a first trailing edge, and a second axially disposed portion, adjacent the first axially disposed portion, formed of a generally non-elastomeric substantially rigid plastic, which comprises multiple, axially extending, laterally spaced apart, ramp-like projections separated by circumferential valleys, which expose elastomeric material. Fluid entering the valleys during a high pressure surge force the composite gasket into a tighter seal.

Abstract: A slat for pivotally mounting between a pair of opposed frame members of an opening. The slat has an elongated member having first and second walls that are coupled together to form first and second longitudinally extending side edges and first and second end edges. First and second coupling members are coupled to the first and second side edges, respectively. The first and second coupling members have first and second coupling ledges spaced from the first and second side edges to form first and second longitudinally extending recesses. Each of the first and second recesses receive an adjacent coupling member on an adjacent slat, respectively. The first recess opens toward the first wall, while the second recess opens toward the second exterior wall. First and second support members are coupled to the first and second ends of the elongated member, respectively.

Abstract: A pipe connection assembly having a branch pipe extending through an aperture in the side wall of a main, double-walled or ribbed pipe, and an elastomeric, tubular gasket positioned in the aperture of the main pipe and surrounding one end of the branch pipe for sealing between the main pipe and the branch pipe. The main pipe has inner and outer cylindrical walls concentrically connected together by at least one rib member, which forms at least one peripheral channel. The tubular gasket seals the space between the inner and outer walls for preventing fluid flowing through the pipes from leaking into the peripheral channel, or channels, of the main, double-walled pipe. The gasket is provided with an annular flange at one end for ensuring proper positioning of the gasket in the aperture of the main pipe. A pipe clamp can be used to secure the gasket to the branch pipe and to provide additional sealing. Preferably, both the main pipe and the branch pipe are composed of a suitable plastic material such as PVC.

Abstract: Plastic pipe has a cylindrical body having longitudinally extending concentric walls spaced from the longitudinal axis of the pipe. The walls are connected by ribs extending generally radially between the walls and longitudinally of the pipe. The pipe is provided with a generally annular resilient axially extending sealing ring entrapped at the end of the pipe by removing an end portion of the ribs, heating and bending an end wall portion so as to entrap a portion of the sealing ring, while permitting a second portion of the ring to axially project beyond the end of the pipe to provide impact resistance to the pipe end. A further embodiment involves omission of the sealing ring and welding the small gap remaining after heating and bending an end wall portion to seal the pipe end.