Adjustable beam focus flashlight
US4987523A · kind A · utility
21Cited by
21References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1990 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Feb 28, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21L2/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An illumination device, for example, a flashlight includes an adjustable beam focus assembly to change the relative position of the lamp bulb to the reflector to alternately provide a narrow focused or wide beam being emitted from the device. The adjustable beam focus assembly includes a resilient blade supporting the lamp bulb extending through an opening in a reflector of the device. Beam focusing is achieved by flexing the blade upon application of a displacing force to the base of the bulb by a cam or to the blade itself using a plunger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.