Cementless lamp bulb and base combination
US4950942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To permit ready attachment of a pinch or press seal terminating a halogen incandescent lamp, particularly for automotive use, a base sleeve (9), for example of steel, is formed as a hollow cylinder having, at the end remote from the bulb, at least two spaced flange elements (28) extending radially inwardly of the sleeve and essentially at right angles to the axis of the lamp. A base plug element, formed as a solid body, for example of highly heat-resistant plastic material, is located projecting from the base sleeve, and positioned remote from the bulb. The essentially cylindrical solid body (29) is formed with a circumferential collar of smaller outside diameter, and separated from the remainder of the solid body by a circumferential ring groove. The collar (30) is subdivided into a plurality of circumferential projections (31, 32), at least two of said circumferential projections are formed with radially outwardly extending holding projections (33) which engage behind and around the flange elements of the base sleeve (9) upon relative rotation of the base sleeve and the plug element formed by the essentially cylindrical solid body ( 29). A metallic holder element (7) surrounds th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.