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METHOD OF JOINING SYNTHETIC-RESIN TUBES

  • US 3,847,694 A
  • Filed: 02/13/1973
  • Issued: 11/12/1974
  • Est. Priority Date: 02/15/1972
  • Status: Expired due to Term
First Claim
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1. IN A METHOD OF FORMING A JOINT BETWEEEN TUBE AND A SLEEVE OF THERMOPLASTIC SYNTHETIC RESIN, ESPECIALLY HARD POLYVINYL CHLORIDE, IN WHICH THE SLEEVE IS HEAT-SHRUNK ONTO A PORTION OF THE TUBE SURROUNDED BY THE SLEEVE AFTER THE TUBE GAS BEEN INSERTED INTO THE SLEEVE WITH CLEARANCE THEREBETWEEN, THE IMPROVEMENT WHEREIN:

  • AT LEAST SAID SLEEVE IS FORMED WITH A CIRCUMFERENTIAL INWARDLY OPEN CORRUGATION DEFINING AN ANNULAR CHAMBER AROUND THE TUBE AT SAID PORTION;

    THE HEAT REQUIRED FOR SHARINKING SAID SLEEVE ONTO SAID TUBE IS SUPPLIED BY INJECTING A HEATED FLOWABLE MOLTEN ADHESIVE INTO SAID CHAMBER UNDER PRESSURE, AND SAID ADHESIVE A COMPRESSED AGAINST SAID TUBE BY SAID SLEEVE UPON THE SHRINKAGE THEREOF.

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