Method for production of a spiral-shaped heating element
US6464918B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1999 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Aug 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In the production of spiral-shaped heating elements, a device winds an oblong base material onto a mandrel while forming a spiral with the base material and equips the ends of the spiral with contacts for electrical connection. The device includes a feeding device for supplying the mandrel, onto whose casing surface the base material is wound in a spiral shape, with the oblong base material. In order to carry out a method for the production of a spiral-shaped heating element made of material containing carbon fibers, the method is as follows: utilize a base material that comprises carbon fibers which have been embedded into IBM a thermoplastic embedding compound, heat the base material to a temperature at which the embedding compound softens, wind the softened base material onto the mandrel while forming the spiral, and set the spiral shape by removing the embedding compound. On the device used to carry out the method, there is included a heating device which affects the base material in the area of the casing surface of the mandrel and can be adjusted to a temperature above the softening temperature of the embedding compound. The invented heating element, which distinguished itsel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.