×

Method of socketing a pipe

  • US 5,928,451 A
  • Filed: 05/08/1998
  • Issued: 07/27/1999
  • Est. Priority Date: 09/20/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of socketing a pipe of oriented plastic having an annular groove inside the socket, characterized inthat an end portion (15) of the pipe is pushed onto a first mandrel element (11;

  • 11A) which is cylindrical and has a diameter corresponding to the inside diameter of the pipe,that the end portion is heated to a temperature (T1) which is above the glass transition temperature (Tg) of amorphous plastic and is above the crystalline melting point (Tm) of crystalline plastic, respectively, on said cylindrical mandrel element in the region (l1) of the end portion of the pipe where the groove is to be located said region being located at the opening of said end portion of the pipe, the rest of said end portion of the pipe being maintained at a temperature below the glass transition temperature or the crystalline melting point, respectively,that the end portion (15) when said region is at a temperature above the glass transition temperature or the crystalline melting point, respectively, is pushed onto a second mandrel element (13;

    13A) axially aligned with said first mandrel element the bottom portion of the socket being formed by said second mandrel element (13;

    13A), andthat the groove is formed by means of a core (14) in said region of the expanded end portion when being at a temperature above the glass transition temperature or the crystalline melting point, respectively.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×