Metal working – Method of mechanical manufacture – Electrical device making
Patent
1974-11-26
1976-01-27
DiPalma, Victor A.
Metal working
Method of mechanical manufacture
Electrical device making
29615, 29619, 338238, 338242, H05B 300
Patent
active
039343332
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: 1960221 (1934-05-01), Kelly et al.
patent: 2157884 (1939-05-01), Backer
patent: 2375058 (1945-05-01), Wiegand
patent: 2483839 (1949-10-01), Oakley et al.
patent: 2846537 (1958-08-01), Thornhill
patent: 2876322 (1959-03-01), Boggs
patent: 2933805 (1960-04-01), McOrlly
patent: 3007235 (1961-11-01), Yohe
patent: 3330034 (1967-07-01), Price
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