Electric lamp with low torque threaded base
US5241238A · kind A · utility
4Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1991 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Dec 16, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A double envelope electric lamp having an outer envelope, support frame, inner capsule, threaded base, center contact, is disclosed. The support frame is formed with hooked ends that lie in shall grooves formed through the threads formed on the lamp neck. The exterior arms abut the metal base when the metal base is threaded onto the outer envelope. By making the exterior arms with a heavy wire, the positioning accuracy may be increased, and surprisingly, the threading torque may be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.