Metal working – Method of mechanical manufacture – Electrical device making
Patent
1985-12-19
1987-06-02
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Electrical device making
29848, 29850, 264 86, 264 87, 26427218, H05B 364
Patent
active
046691812
ABSTRACT:
A thermal heating and insulating unit is manufactured by molding in situ a block of thermal insulating material about an electrical resistance element. The resistance element is first made from a continuous wire of electrical resistance material and formed into a serpentine configuration with a plurality of segments interconnected by bends at the ends of the segments. In a preferred construction, the segments are straight and the bends at the ends of the segments are in opposite directions. The resistance element is positioned in a mold on a plateau above a porous bottom, the bends overlapping the plateau, and a slurry of inorganic fibers, water and a binder is introduced into the mold to a lever above the plateau, the liquid component of the slurry passing through the porous bottom, and the fibers and a portion of the binder collecting on the porous bottom to form a block with a slot confronting the resistance element, the bends of the resistance element being embedded in the block. The block is then dried to produce a heating and insulating unit.
REFERENCES:
patent: 940450 (1909-11-01), Ferla
patent: 1645867 (1927-10-01), Louthan
patent: 3389461 (1968-06-01), Hardardt
patent: 3471680 (1969-10-01), Kelm
patent: 3696507 (1972-10-01), Unger et al.
patent: 3952408 (1976-04-01), Docx
patent: 4321459 (1982-03-01), Miyahara et al.
Echols P. W.
General Signal Corporation
Goldberg Howard N.
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