RU95122133A - METHOD FOR CONNECTING THERMOPLASTIC PIPE WITH COUPLING - Google Patents

Claims (6)

1. The method of connecting a thermoplastic pipe with a sleeve comprising a tubular insert having outer annular protrusions separated by annular grooves, an outer shoulder and a tubular plug, characterized in that the maximum inner diameter of the tubular sleeve is smaller than the outer diameter of the pipe, comprises the steps of making a relative entry into each other sleeves and pipes, and the pipe narrows as the sleeve moves along it and then sequentially restores its shape, forming an end section of the pipe that is not narrowed by the sleeve minutes, introducing the insert into the end portion and the relative movement between the sleeve and the end as long as the end portion is not crimped between the protrusions and the sleeve.  2. The method according to claim 1, characterized in that the insert is introduced into the end portion until the end of the pipe abuts against the shoulder.  3. The method according to claim 1 or 2, characterized in that the groove of the insert located adjacent to the shoulder, perform wider than any other groove.  4. The method according to any preceding paragraph, characterized in that the sleeve is moved relative to the end until it abuts against the shoulder.  5. The method according to any preceding paragraph, characterized in that the maximum outer diameter of the protrusions is less than the minimum inner diameter of the pipe.  6. The method according to any one of paragraphs. 1 - 4, characterized in that the maximum outer diameter of the protrusions is greater than the minimum inner diameter of the pipe, while the insertion does not cause the pipe to stretch enough to cause undesirable tensile stresses in any pipe reinforcement or to cause any undesirable tensile stress in the pipe that does not have any any fittings.