Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1992-09-15
1994-06-14
Reynolds, Bruce A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219551, 285 41, 285113, H05B 326, F16L 4702
Patent
active
053212339
ABSTRACT:
An electrofusion fitting for sealing a distribution line, or main, includes upper and lower arcuate sleeve members securely coupled together about the line by means of nut and bolt combinations. Extending radially from the upper sleeve member is a cylindrical flange with a threaded end portion through which a line tapping tool may be inserted for either inserting a seal in the line or for coupling a branch line to the distribution line. A pair of electrodes extending from the upper sleeve member form an electrofusion circuit with a heating conductor disposed intermediate the line and upper sleeve member for forming a fusion bond therebetween. A sealing gasket is disposed about the flange opening in the upper sleeve member to provide an immediate, temporary seal between the upper sleeve member and the line to permit rapid sealing of the line followed by permanent electrofusion sealing of the fitting on the line permitting the immediate tending to any necessary repair work to the line. The fitting is preferably comprised of polyethylene for secure bonding to a distribution line of like composition.
REFERENCES:
patent: 3987276 (1976-11-01), Vogelsanger et al.
patent: 4515177 (1985-05-01), Thalmann et al.
patent: 4655480 (1987-04-01), Thalmann
patent: 4815650 (1989-03-01), Reaux
patent: 4817994 (1989-04-01), Bronnert
patent: 4894521 (1990-01-01), Evans
Innogaz electrofusion system, Trouvay & Cauvin, Inc., Houston, Tex. 77084, pamphlet, 1987.
Stop The Flow In Plastic Pipe Without Shutdown, T. D. Williamson, Inc., Tulsa, Okla. 74101, pamphlet, Mar. 1991.
Barrett Robert E.
Murphy Kevin
Jeffery John A.
Northern Illinois Gas
Reynolds Bruce A.
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