Abstract: A one-piece molded plastic stake includes a slender elongate body formed of four integral webs which taper inwardly from a rounded striking surface at the trailing end of the stake to an intermediate point of the stake where the webs extend outwardly to provide a shoulder to resist pullout, once the stake has been driven into the ground. The webs taper inwardy from the outer ends of the outwardly extending portions and merge at a point at the leading end of the stake. Reinforcing portions are provided between the webs at the trailing end of the stake and provide for an enlarged striking area.

Abstract: Conduit sections are provided which have multiple interior partition walls and which are adapted to be interconnected to form continuous passageways for underground cables. Each conduit section consists of a lightweight injection molded plastic material including an enclosing wall which has reinforcing thereon to aid in withstanding pressure and loads to which the sealed underground conduit may be subjected. The conduit section also has improved joint seal characteristics for interconnecting two sections.

Abstract: A length of pipe conduit is provided for forming a joint arrangement on each end with adjacent lengths of like pipe or conduit. The length of pipe is formed of plastic with a structurally rigid wall having a middle portion presenting exterior circumferential reinforcing flanges at spaced intervals along the length of the pipe and longitudinal reinforcing ribs at spaced intervals about the exterior of the pipe. One end of the length of pipe has a round tubular wall presenting a sealing gasket and male section with thread rib segments. The other end of the length of pipe has a female section with thread groove segments for receiving and threadingly engaging the male section of a similar length of pipe. The thread rib and thread groove cross-section profiles are triangular.

Abstract: A device is disclosed which is suitable for connecting a multiple bore conduit, buried in the ground, to a manhole having a vertical wall. An adapter is embedded in the manhole wall and has outwardly directed ribs to prevent movement of the adapter perpendicularly to the manhole wall. The conduit has a rib, and a coupling sleeve is positioned about the rib and is juxtaposed to the outside surface of the conduit along an end segment of the conduit, with a gasket seal such as an O-ring being disposed between the coupling sleeve and conduit to create a seal therebetween. An adhesive is applied to an end segment of the outer surface of the coupling sleeve, and the conduit and coupling sleeve are inserted into an end portion of the adapter. The adhesive causes the coupling sleeve to be bonded to the adapter, with a seal being created therebetween, whereby the conduit is mechanically attached to the coupling sleeve which is secured to the adapter, and a seal is created between the conduit and adapter.

Abstract: An adapter is disclosed for connecting a multi-passage conduit section to a plurality of single bore pipes. Both the conduit and the adapter have partition walls forming passageways, and the adapter has a male end receivable in the female end of the conduit. The partition walls at the male end of the adapter are generally rectangular and correspond in configuration to the partition walls at the female end of the conduit, whereas the partition walls at the opposite end of the adapter along with the enclosing walls of the adapter define a plurality of cylindrical sleeves into which pipe sections are receivable. The partition walls taper generally uniformly from a generally rectangular to a cylindrical configuration. The pipe sections can be coupled to single bore pipes.