Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1984-02-09
1986-12-02
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156268, 156293, 219535, 219544, 285 21, B32B 3118
Patent
active
046263080
ABSTRACT:
The invention provides a method of forming a welded joint between an end of a thermoplastic pipe or pipe like member and a surrounding pipe fitting including a thermoplastic sleeve, comprising the steps of forming around the internal wall of the sleeve a helical cut, said cut being inclined to the surface of the wall along the line of the cut, and the cutting tool and its angular relationship to the bore of the fitting being chosen such that during incision an internally extending flap of the thermoplastic material produced by the incision is caused to open out and deform transverse to the direction of incision whereby a helical cavity is formed within the sleeve wall; feeding into said cavity an electrically conducting wire; working the internal wall of the sleeve so as to lay, at least partially, the flap against that wall and enclose the wire within the cavity between the flap and the sleeve wall; fitting the sleeve about the end of the pipe or pipe like member; and passing an electrical current through the electrical wire so as to fuse the sleeve to the pipe or pipe like member.
REFERENCES:
patent: 4147926 (1979-04-01), Stahli
patent: 4455482 (1984-06-01), Grandclement
The Victaulic Company PLC
Weston Caleb
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