Fluorescent lamp for use in explosive atmospheres such as mines
US4042819A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1976 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Jul 9, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Lamp having a lighting assembly, an inner guard assembly, and an outer guard assembly. The lighting assembly includes an elongated fluorescent bulb, starter and ballast members each having a socket portion removably connected to pins at the ends of the bulb, and an electrically conductive grounding bar interconnecting the starter and ballast members. The inner guard assembly includes a transparent cylindrical plastic housing enclosing the bulb, and end housings at the ends of the cylindrical housing enclosing the starter and ballast members respectively. The outer guard assembly includes an elongated support plate to which the end housings are fastened, a plurality of hoops fastened to the support plate at spaced intervals, and a plurality of guard rods parallel to the bulb housing welded across the hoops to provide a cage-like outer protection for the inner guard assembly. The ballast member is unitary, including one of the above-mentioned socket portions at one end removably electrically connected to the pins at one end of the bulb, and a plug at the opposite end removably electrically connected to a power outlet socket in the corresponding end housing of the inner guard assembly…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.