Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1976-02-25
1978-02-28
Truhe, J. V.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219486, H05B 302
Patent
active
040769755
ABSTRACT:
An electrical furnace has a plurality of electrical heaters and a control unit carried by a frame. A rigid lead unit is carried by the frame and has rigid lead means directly and electrically interconnected to terminals of the heaters and terminals of the control unit, the rigid lead unit itself having terminals for electrically interconnecting the rigid lead means to power source leads whereby the power source leads are directly and electrically interconnected to the terminals of the heater and the control unit by the rigid lead means without the need for auxiliary wiring. The control unit includes an electrical sequencing switch construction having a plurality of electrical switches for sequentially operating the heaters, the switch construction having a temperature sensing unit operatively interconnected to the switches for moving and holding the same in open conditions thereof when the temperature sensing unit senses a high temperature condition of the heaters.
REFERENCES:
patent: 3161758 (1964-12-01), Biermann et al.
patent: 3385100 (1967-12-01), Schleicher
patent: 3579264 (1971-05-01), Mork et al.
patent: 3813626 (1974-05-01), Cetola
patent: 3852695 (1974-12-01), Northrup
patent: 3912906 (1975-10-01), McIntosh
Tyler Hugh J.
Wolfe Denis G.
Bell Fred E.
Robertshaw Controls Company
Truhe J. V.
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