Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1983-03-16
1985-09-03
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219328, 219335, 219337, 219437, 219512, 337348, 337371, H05B 102, H05B 382, H01H 3754, A47J 2762
Patent
active
045394687
ABSTRACT:
An electric immersion heating element dry switch-on or boil dry protector unit for an electrically heated water boiling vessel comprises primary and secondary bimetals (31,32) responsive to the heating element head temperature and each arranged for actuating a respective one of primary and secondary switching contacts (11,12) connected in the line and neutral sides of the heating element supply via respective push rods (38,44). The secondary bimetal (32) is arranged to break later than the primary bimetal (31) in a dry switch-on or boil dry situation giving rise to excessive element temperatures, and to reset before the primary in a reducing temperature situation. The secondary bimetal (32) and associated switch contacts (12) provide back-up protection in the event of failure of the primary protection on account for example of welding of the primary switch contacts (11). A neon warning lamp connected across the secondary contacts (12) will be lit only if the secondary contacts open with the primary contacts closed and thus indicates failure of the primary protection. An advantageous manually releasable latching arrangement for the primary and/or secondary switching contacts is also provided. An additional bimetal subject to heating by steam vented from the vessel operates at least one of the switch contacts when water boils in the vessel to terminate the heating operation.
REFERENCES:
patent: 2806123 (1957-09-01), Steinbock
patent: 3475590 (1969-10-01), Pins
patent: 3852698 (1974-12-01), Schmitt et al.
patent: 3885222 (1975-05-01), Manecke
patent: 3943480 (1976-03-01), Schmitt
patent: 4288686 (1981-09-01), Cretors
Fletcher Keith
Naylor Peter W.
Phillips Richard A.
Bartis A.
Otter Controls Limited
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