Method for connecting two plastic pipes together, as well as an induction connecting sleeve for use in the method
AssigneeMerisa Investments BV
InventorsErik BIJLOO, Kees DONK, VAN DER
Life of this patent
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Abstract
To connect two plastic pipes 3 together, an induction connection sleeve 1 is used, which is provided with annular recesses 5 into which the pipes 3 with the ends 3A are pushed. Subsequently, induction heating elements 9 present in the induction connecting sleeve are heated with induction hand pliers 21 and the induction connecting sleeve is pressed against the end 3A of one of the tubes 3. The induction connection sleeve fuses to the tube. Because the induction hand pliers 21 are provided with ribs 27, grooves 19 are pressed into the pipe wall 3B in order to check whether sufficient heating and pressing has taken place over the entire circumference to obtain a gastight connection.
Claims9
Method for connecting two plastic pipes (3) together by means of an induction connecting sleeve (1;
- 31) provided with a cylindrical part (1A;
- 31A) over which the pipes (3) with their ends (3A) can slide, wherein at least one induction heating element (9;
- 39) is present in the wall of the induction connecting sleeve (1;
- 31), in which method first at least one of the two tubes (3) to be connected to each other is inserted with one of its ends (3 A) over and/or into the induction connecting sleeve (1;
- 31), then electric currents are induced into the induction heating element (9;
- 39) by means of a primary induction coil (25), causing heat development in the induction heating element (9;
- 39) and locally softening or melting of the induction connecting sleeve (1;
- 31), and simultaneously causing pressure on the outside of the tube (3) at the location of the induction connecting sleeve (1) and/or on the outside of the induction connecting sleeve (1) to melt the tube (3) and the induction connecting sleeve (1;
- 31) together or to fuse the tube (3) and the induction connecting sleeve (1;
- 31), characterized in that the pressure on the tube (3) and/or on the induction connecting sleeve (1) is exerted by an induction hand pliers (21) provided with two arcuate pressing jaws (23), which are placed around the induction connecting sleeve (1) and/or around the pipe (3) at the location of the induction connecting sleeve (1;
- 31) and which are provided with ribs (27) with which at least one circumferential groove (19) in the pipe (3) and/or in the induction connecting sleeve (1) is formed, which circumferential groove (19) serves to check whether the induction hand pliers (21) has sufficiently heated the entire circumference.
Dependencies are inferred from the claim text.