Method for making a heat sensitive fault detecting and indicating device for watthour meter
US4118667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Jan 21, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S20/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for making a heat sensitive fault detecting and indicating device for a watthour meter is disclosed herein. The illustrated method is particularly useful for a watthour meter that conventionally includes a potential stator and a current stator both of which are mounted thereon one or more permanent magnets and a rotatable disk assembly with disk rotation being recorded on the recording dials of a register assembly visible through the enclosing glass cover of the meter. The current stator of such a meter normally includes a pair of current coils that are heat responsive and a method is disclosed for providing a heat sensitive fault detecting and indicating device that may be associated with such coils. The method includes providing a layer of heatable material, such as a low melting point metal, for example, which layer is covered by a covering such as a sheath, for example, with predetermined portions of the sheath being thinned, as by embossing, for example, with a predetermined symbol or other indicia so that when a current surge is experienced at the watthour meter producing sufficient heat at the current coils, the low melting point metal melts and penetrates the thinn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.