초록 ▼

Plastic, such as polyolefin, pipe having a locking integral end connection. The pipe is fabricated with male and female end connections in order that the pipe may be press-fitted together with the interior and exterior forming a flush uninterrupted surface. One or more radial ribs and grooves are fo

Plastic, such as polyolefin, pipe having a locking integral end connection. The pipe is fabricated with male and female end connections in order that the pipe may be press-fitted together with the interior and exterior forming a flush uninterrupted surface. One or more radial ribs and grooves are formed on the interior of the female connection while a registering series of ribs and grooves are formed on the exterior of the male connection. The ribs and grooves are of an interfitting axially extending wedge shaped configuration to provide a locking engagement to resist any tendency for separation. Interfitting corners of the ribs and grooves may be rounded to distribute stress and minimize damage when the pipe ends are fitted together. The ends of the pipe are bevelled in order that the ends pressed together engage and by the slight resiliency of the polyolefin pipe construction permit the slight expansion and contraction of the ends to provide a locking interfit of the respective ribs and grooves in the two ends. A reinforcing sleeve may be used over the coupling for additional strength. The wall thicknesses of the end connection and width of the ribs and grooves are particularly dimensioned in order that the male end may be inserted to a complete lock position without premature engagement.

대표청구항 ▼

Plastic pipe having an integral end connection comprising a pair of female and male integral end connections for adjacent lengths of pipe adapted to be press-fitted together to form a locked end connection with said adjacent lengths of pipe, said female end connection comprising a plurality of discr

Plastic pipe having an integral end connection comprising a pair of female and male integral end connections for adjacent lengths of pipe adapted to be press-fitted together to form a locked end connection with said adjacent lengths of pipe, said female end connection comprising a plurality of discrete interior circumferentially extending radial, circular, uniform diameter ribs and plurality of discrete interior circumferentially extending radial, circular, uniform diameter grooves bordering said ribs, said male end connection comprising a plurality of corresponding discrete exterior circumferentially extending radial, circular, uniform diameter ribs and a plurality of discrete exterior circumferentially extending radial, circular uniform diameter grooves bordering said last named ribs, said male and female end connections being adapted to be axially press-fitted together to distend said female end connection and compress said male end connection until a mating relation of the ribs and grooves in said end connections is obtained, said ribs and said grooves having an axially extending wedge shape portion having a greater axial width than the remainder of the respective ribs and grooves from which they extend, said wedge shape portion extending exteriorly in an axial direction from a side of the ribs and interiorly in an axial direction from a side of the grooves to provide a locking fit to resist separation.