Patent
1976-06-14
1977-12-13
Envall, Jr., R. N.
F27D 102
Patent
active
040630285
ABSTRACT:
A dual ring liftable and swingable roof for an electric furnace is provided with an outer, hanger-suspended, refractory tile, apron-defining roof portion between its outer fluid-cooled ring and its upwardly positioned inner ring. A central part of the roof is covered by refractory tile members that are hanger-suspended and that define spaced-apart, electrode-receiving and fume exhaust-discharging hole portions. An overhead metal frame structure has a pair of spaced-apart, water-jacketed, primary side beams that extend across the roof to support a centrally disposed air supply ductwork that extends about the hole portions, and that supplies cooling air to adjacent hanger and tile member. A quadrant arrangement of secondary beams is utilized, to connect the inner and outer ring members; one part of the secondary beams is also water-jacketed to connect opposite ends of the pair of primary beam members and provide a continuous flow of cooling fluid.
REFERENCES:
patent: 3756172 (1973-09-01), Brereton et al.
patent: 3829595 (1974-08-01), Nanjyo et al.
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