Method of socketing a pipe
First Claim
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.
3 Assignments
0 Petitions
Accused Products
Abstract
A method of socketing a pipe of oriented plastic having an annular groove inside the socket. An end portion (15) of the pipe is pushed onto a cylindrical mandrel element (11) and the region (l1) of the end portion at the opening thereof where the groove is to be located is heated to a temperature above the glass transition temperature of amorphous plastic and the crystalline melting point of crystalline plastic, respectively. The rest of the end portion is maintained at a temperature below the glass transition temperature or the crystalline melting point, respectively. 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) axially aligned with the first mandrel element the bottom portion of the socket being formed by said second mandrel element (13). The rest of the end portion is expanded to form the bottom portion of the socket. The end portion of the pipe is cooled and is then withdrawn from the mandrel elements.
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Citations
20 Claims
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1. A method of socketing a pipe of oriented plastic having an annular groove inside the socket, characterized in
that 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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- 11A) which is cylindrical and has a diameter corresponding to the inside diameter of the pipe,
Specification