Electric heating – Heating devices – With heating unit structure
Patent
1983-01-11
1985-08-27
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
174 65SS, 174 77R, 219523, 277119, 285341, 338273, H05B 308
Patent
active
045380538
ABSTRACT:
Termination apparatus for elongate heaters which have an outer metal sheath and which are designed for use in hazardous environments. The apparatus comprises a junction box within which the heater is terminated and which has an entry port through which the heater enters the junction box. Secured to the entry port is a connection member comprising first and second compression members which surround a heater passing through the entry port and which define between them a chamber. Within the chamber is a grommet which is composed of lead or another deformable metal. The compression members can be drawn together, thus reducing the size of the chamber between them and deforming the grommet into close conformity with the metal sheath of the heater. In this way, if flames are generated within the junction box, they cannot ignite explosive gases surrounding the junction box.
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Morrow Danny G.
Oiwa Thomas Y.
Burkard Herbert G.
Kaufman Stephen C.
Mayewsky Volodymyr Y.
Raychem Corporation
Richardson Timothy H. P.
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