Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1993-07-02
1995-01-31
Evans, Geoffrey S.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
1563042, 285 21, 285286, F16L 1302
Patent
active
053861019
ABSTRACT:
For welding tubular plastic parts (1) formed as a compound tube there is used a welding element (20) which is arranged with its inner peripheral surface (23) on projections (10) of the tubular parts (1) and reciprocally centers them. The welding element (20) has an annular part (21) with a heating coil (22) on its outer contour. The heating coil (22) has coil strands laid in a zig-zag shape which are curved in a U-shape and extend transversely to the peripheral direction of the annular part (21).
REFERENCES:
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patent: 3744823 (1973-07-01), Muir et al.
patent: 3770302 (1973-11-01), Hallenbeck
patent: 3778534 (1973-12-01), Jenkins
patent: 4135739 (1979-01-01), Mackenzie
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patent: 5125690 (1992-06-01), Taylor et al.
patent: 5320697 (1994-06-01), Hegler et al.
Petry Dirk A.
Steinmetz Hans W.
Evans Geoffrey S.
Georg Fischer Rohrleitungssysteme AG
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