Forming tool for lamp bases
US7465209B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2006 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Jun 9, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing a flash-free lamp base (10), wherein the lamp base (10) comprises a shell (14), an eyelet (16) and a glass, electrically insulating part (18) therebetween and joining the shell (14) and the eyelet (16), the shell and the eyelet being electrically conductive, the shell (14) having a tubular portion (14a) with an open end (14b) and a partially closed end (14c) defining a volume (14d) therebetween, the partially closed end (14c) including a tapered area (14e) terminating in a reentrant section (14f) that extends into the volume (14d) and defines an inner annulus (14g). The method of making the base comprises the steps of positioning the shell (14) and the eyelet (16) at a workstation (19) in spaced, axial alignment with one another defining a gap therebetween; actuating a first forming tool (20) through the tubular portion (14a) and into engagement with the tapered area (14e) and the inner annulus (14g); dispensing a quantity of molten glass (32) into the gap; and actuating a second forming tool (22) within the first forming tool (20) to form the molten glass (32) into an electrically insulating part (18) between the shell (14) and the eyelet (16). The base s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.