Electric heating – Heating devices – With heating unit structure
Patent
1998-03-16
2000-10-03
Jeffrey, John A.
Electric heating
Heating devices
With heating unit structure
219535, 1562742, 1563042, 285 212, 285 41, B29C 6534, F16L 4702
Patent
active
061276626
ABSTRACT:
A method of joining a first pipe of a plastic material to a second pipe of a material which does not bond well to the plastic material, utilizes an electrofusion sleeve of a plastic material which bonds well to the plastic material of the first pipe and having a first coil of electrical heater wire on the inner surface at one end of the sleeve to receive the first pipe and a second coil of electrical heater wire on the inner surface at the opposite end of the sleeve to receive the second pipe. The opposite end of the sleeve includes a bonding material capable of producing a good bond, when activated by heat, between the materials of the sleeve and of the second pipe. The two pipes are inserted into the two ends of the sleeve, and electrical current is applied to the two coils to cause the first end of the sleeve to bond by electrofusion to the first pipe, and the second end of the sleeve to bond by electrofusion and by the bonding material to the second pipe.
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"New Techniques for Joing Dissimiliar Materials" Welding Review International vol. 12, No. 1, pp. 40-42, Feb. 1993.
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European Patent Office Publication No. JP 7253187 of Mar. 10, 1995.
Barish Benjamin J.
Jeffrey John A.
Plasson Maagan Michael Industries Ltd
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