Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1988-08-01
1989-07-25
Wityshyn, Michael
Electric heating
Heating devices
With heater-unit housing, casing, or support means
156158, 1562742, 1563042, 1563043, 1563046, 1563797, 428 65, 219536, 403270, B29C 6534
Patent
active
048516473
ABSTRACT:
In order to weld butt-jointed plastic tubes, a welding element with a wire coil for electrical resistance heating is positioned between the abutting tube ends. The tube ends are pressed to each other while at the same time the welding device is heated to welding temperature. Lastly, the tube ends are held together until the welded area has hardened by cooling. The welding device is constructed in the form of an annular disc the external diameter of which is approximately equal to the external diameter of the tubes and the internal diameter of which is approximately equal to the nominal internal diameter of the tubes. A heating wire coil spirals around the geometric center of the annular disc, and is positioned on the two annular disc surfaces that come into contact with the tube ends.
REFERENCES:
patent: 2744655 (1956-05-01), Vnuk
patent: 4266997 (1981-05-01), Lippera
patent: 4313053 (1982-01-01), Sturm
patent: 4455482 (1984-06-01), Grandchlement
patent: 4689108 (1987-08-01), Barry, Jr. et al.
Firma Riesselmann & Sohn
Wityshyn Michael
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