Relieved plastic lamp base
US4979082A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Jun 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A relieved plastic lamp base has been discovered to substantially eliminated cracking of the captured press seal. The relieved base has a formed cavity for receiving the press seal of an electric lamp. The cavity has a first internal base wall to couple with a first exterior lamp wall of the lamp, a second internal base wall to couple with a second exterior lamp wall of the lamp and, cavity portion formed in the internal base wall intermediate the first interior wall and second interior wall of the lamp. The relief cavity is opposite a seam area of the press seal when the press seal is positioned in the lamp base. The relief accommodates excess material due to tool variations, tool wear, and press variations and thereby allows longer tool operation between tooling changes. The relief also accepts a wider variation in noncritical seal measurements. The relief lessens the likelihood of chipping the seal corner, and displaces the holding forces that tend to open a corner chip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.