Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1980-05-01
1982-05-11
Bartis, A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
138 33, 219301, 219311, 219528, 219543, 219549, 338212, H05B 336, F16L 5300, F03B 712
Patent
active
043295690
ABSTRACT:
A resilient snap-on electric heating jacket for heating tubular objects includes a thin sheet of flexible plastic material constituting a radially internal curved surface adapted to engage the surface of the object. A pattern of spaced electrically conductive loops are formed on the radially external surface of the sheet to define an electric heating element. A thick resilient support member of polymeric material coextensive with and overlying the external surface of the plastic sheet and the foil loops is directly secured to the external surface portions of the foil loops and the plastic sheet by an autogenous bond to form a unitary structure generally C-shaped in cross section and capable of being snapped onto a tubular object the outer diameter of which corresponds approximately to the inner diameter of the profile of the unitary structure. The profile of the support member encloses an angle between 180.degree. and 270.degree. and preferably between 200.degree. and 250.degree..
REFERENCES:
patent: 1992593 (1935-02-01), Whitney
patent: 2961522 (1960-11-01), Hammer
patent: 3125657 (1964-03-01), Colten
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patent: 3597591 (1971-08-01), van Derlip
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patent: 3757087 (1973-09-01), Bernard
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patent: 3968348 (1976-07-01), Stanfield
patent: 4060710 (1977-11-01), Reuter
patent: 4281238 (1981-07-01), Noma et al.
Fredriksson Tommy
Hjortsberg Bengt
Bartis A.
Bulten-Kanthal AB
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