Electrical heating units
US4253012A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 1979 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | May 16, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/68
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Described herein is an electrical heating unit for smooth top cookers. The unit comprises a heating element in the form of a spiral coil of bare wire which has then been helically rolled together with a strip of flexible thermal and electrical insulation such as a ceramic paper around a central core. The resulting rolled structure is some-what analogous to a "Swiss roll". This structure rests on and is supported on a base layer of thermal and electrical insulation which is desirably dish-shaped and contained an outer metal pan for earthing and mechanical protection. The rolled structure is retained in its configuration and held against the base layer by a number of spoke-like members of heat resistant and electrically insulating material across the top of the element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.