Metal working – Method of mechanical manufacture – Electrical device making
Patent
1981-08-03
1987-09-01
Echols, Percy W.
Metal working
Method of mechanical manufacture
Electrical device making
29613, 219505, 219534, 219537, 219544, 338 22R, 338328, H05B 300
Patent
active
046898786
ABSTRACT:
Crankcase heater including heat-generating electrical resistance elements and the method of manufacturing such heaters. The resistance elements include at least one positive temperature coefficient (PTC) heater element, platelet in form, adhesively bonded between a pair of metallic conductor-electrodes using an electrically conductive adhesive of high thermal conductivity. The electrodes formed for integral connection to electrically conductive lead wires serve as heat sinks dimensioned in length to provide a heater of predetermined wattage. The assembly of resistance elements, electrodes and lead wire connections are molded within the sheath of electrical insulation which is a silicone elastomer, having ceramic particles dispersed therein for enhanced thermal conductivity. The insulated heater is dimensioned in cross section so that when disposed within the well of a crankcase (compressor) its outer surface will leave a clearance which is less than thermal expansion of the silicone elastomer. Thus, when the heater is energized, its silicone sheath will expand into surface-to-surface contact with the surrounding well.
REFERENCES:
patent: 2937354 (1960-05-01), Mazzarella et al.
patent: 4104509 (1978-08-01), Van Bokestal et al.
patent: 4147927 (1979-04-01), Pirotte
"Expanding Cartridge Improves Heat Transfer", Machine Design, p. 42, vol. 53, No. 7, Mar. 26, 1981.
Beauregard William W.
Fessenden Peter J.
Echols Percy W.
Springfield Wire Inc.
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