DEVICE FOR CONNECTION OF PLASTIC PIPES Russian patent published in 1999 - IPC

FIELD: connection of plastic pipes. SUBSTANCE: end of pipe union pressed in plastic pipe has circular recess in form of projection of larger base of starting truncated taper surface above smooth cylindrical surface of circular groove whose diameter is equal to inner diameter of pipe. Cylindrical thread is cut on other end of pipe union whose diameter is equal to outer diameter of pipe and on outer surface of plastic pipe whose end face is tightly pressed to end surface of pipe union on side of its groove. Two or three turns of thread belong to pipe union and other turns are their extension and belong to outer surface of pipe. Sleeve screwed on its thread has starting chamfer which is coaxial to thread, thus ensuring tight pressing of wall of plastic pipe to surface of circular shoulder of pipe union on side of its groove. EFFECT: simplified construction; facilitated manufacture. 2 cl, 1 dwg