Power switching arrangement for cooking oven
US5280157A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Jan 31, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24C7/087
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A power switching arrangement for a self-cleaning oven appliance incorporating a unique arrangement of two double throw relays in the oven power control circuit. The two relays are operatively interconnected to selectively couple the oven bake and broil elements to the three wire power supply to switch the bake element across L1 and L2 and the broil element across L1 and N when operating in the bake mode, and switch the bake element out of the circuit and the broil element across L1 and L2, when operating in the broil mode. The interconnection is accomplished in a manner which prevents both heating elements from being simultaneously energized at full power regardless of the failure mode of the switching circuitry, thereby eliminating the need for a thermal limit switch to guard against excessive temperatures in the oven resulting from worst case switching circuit failures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.