Electric heating – Heating devices – With heating unit structure
Patent
1977-11-23
1979-10-23
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219541, 219552, 338240, 338242, H05B 344
Patent
active
RE0301264
ABSTRACT:
A heater unit of bilateral construction is formed by forming a resistor assembly of a resistor helix extending between cylindrical terminals and overlapping the same, inserting the assembly in a sheath tube, filling the tube with MgO powder, placing laminated mica end plugs over the terminals and extending into the ends of the tube, bending the tube into a U-shape, pressing the legs of the U together and feeding the pressed unit through swaging dies to deform the tube over the entire length thereof to provide a heater unit of substantially circular cross section and having two legs of substantially semicircular cross section. The resistor helix in the area of the leg portions has a cross-sectional shape corresponding to the cross-sectional shape of the sheath and the terminals and mica plugs within the sheath are flattened to provide a similar cross-sectional shape thereby locking the terminals within the sheath.
REFERENCES:
patent: 1157916 (1915-10-01), Wentworth
patent: 1213881 (1917-01-01), Kearsley
patent: 1731119 (1929-10-01), Abbott et al.
patent: 2157884 (1939-05-01), Bacher
patent: 2322988 (1943-06-01), Wiegand
patent: 2701410 (1955-02-01), Huck et al.
patent: 3292242 (1966-12-01), Giger
patent: 3582616 (1971-06-01), Wrob
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