Patent ID: 7300536
Filing Date: 2007-11-27
Classification: C09J,F16B,F16L

Abstract:
1. A method of attaching together a larger tube and a smaller tube in a T-shaped intersecting joint, comprising: providing aligned inlet and outlet holes in the opposing walls of the larger tube, said holes being formed to include flanged portions of the opposing walls that respectively surround the inlet and outlet holes, and said flanged portion of the outlet hole further having an inturned wall portion surrounding the outlet hole; providing a circumferential extending flange on the outside of the smaller tube; placing an adhesive on either the outside of the smaller tube or on the inside of the flanged portions of the larger tube; inserting the smaller tube into the inlet hole in the larger tube and through the outlet hole of the larger tube hole so that the adhesive is interposed between the flanged portions of the larger tube and the outside of the smaller tube and so that the flange on the smaller tube comes into electrical conducting contact with the flange portion surrounding the inlet hole of the larger tube and the inturned wall portion of the flange portion surrounding the outlet hole of the larger tube comes into electrical conducting contact with the smaller tube; and applying electrical current to flow between the large tube and the small tube so that electrical resistance heating is obtained to cure the adhesive.