Venitian blind lamp
US4800473A · kind A · utility
Inventor
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V11/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lamp comprising an open main frame interconnecting a cover and a base, an elongated incandescent light tube frictionally mounted at one end to the cover and at the other end to the base, and a plurality of rectangular louvers mounted at their top and bottom ends to the cover and base respectively by corresponding pivotal rods, and arranged in concentric fashion around the light tube. Each louver is lengthwisely pivotable in increments between an opened position, about a plane radial to the light tube, and a closed position, in which the two long side edge portions thereof overlap corresponding portions of the pair of opposite adjacent louvers to completely block light. An annular gear is rotatably mounted within an annular cavity of the lamp base, and meshes with pinions each fixed to the bottom pivotal rod of each louver. Hand-operated synchronous pivotal action of the louvers is thus possible by rotating the annular gear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.