Cementless electric lamp - base combination
US5010272A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R33/09
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To provide a compact structure in which a base core (17, 48) can be fitted nto a metallic base sleeve (9, 40) to which a holding structure (4, 7, 34) of a halogen incandescent lamp can be attached, the base core or the sleeve are formed with interengaging rim - engagement surfaces, and the base sleeve, further, is formed with projecting tabs which engage over or into the base core, through slits and recesses formed therein, to hold the base core in position; the base sleeve is additionally formed with a positioning or locating ring or plate (10, 44) so that the lamp holding structure (4, 7, 34) can be welded to the base sleeve to accurately position the filament of the lamp with respect to the locating plate or ring so that the filament can be located with respect to the focal point of a reflector, the tabs permitting compensation for tolerances in the base core, which may be substantial when made of ceramic material. Ceramic, typically Steatite, base cores are highly temperature-resistant, important when the lamp is a halogen incandescent lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.