Ceramic coated electric heater assembly for tools
US4438322A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1981 |
| Grant date | Mar 20, 1984 |
| Priority date | — |
| Expiry date | Jun 16, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49098
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric heater assembly for tools having a removable heated tip includes a tubular metal base having an open end adapted to removably receive and hold the end of the tool tip. A coating of ceramic electrical insulation material is provided on a portion of the exterior of the base and a length of Nickel-Iron alloy resistance wire is wound on the ceramic coated portion. Electrical lead wires are connected in lapped relationship to the respective ends of the resistance wire. Each lead wire includes a first portion lying between several turns of resistance wire and the ceramic coating on the base and a second portion bent back and overlaying the several turns of resistance wire. The second portion is wrapped with at least one additional turn of the resistance wire. A coating of ceramic electrical insulation material is provided over the resistance wire and the terminals to seal the same from the deliterious effects of the atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.