Electrical coil assembly
US4160967A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1977 |
| Grant date | Jul 10, 1979 |
| Priority date | — |
| Expiry date | Jul 28, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F5/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical coil assembly comprises a rectangular, flat annular coil and a flexible annular covering of, for example, fibre board sheet surronding the coil so as to provide a substantially dustproof seal. The covering is formed by folding and glueing a blank around the coil. The blank comprises a rectangular annular portion a first pair of flaps extending one from each of two opposite outer peripheral sides of the annular portion, a second pair of flaps extending one from each of two opposite sides of the inner periphery of the annular portion and further flaps extending from the outer periphery of the annular portion. The annular portion is provided with fold lines and is of a size, when folded, to overlie opposite faces of the coil and the flaps fold around the inner and outer peripheries of the coil to provide a substantially dustproof seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.