Dynamo-powered torch
US5839817A · kind A · utility
Inventor
Key dates
| Filing date | Sep 23, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Sep 23, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21L13/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dynamo-powered torch operative without a power supply in the form of a battery is disclosed. The dynamo-powered torch includes a cylindrical hollow body and a dynamo housed in the cylindrical hollow body. The cylindrical hollow body has a knob disposed at a rear end thereof. The knob has an axle centrally mounted on a face of the knob and a spiral power spring mounted around the axle. A clamp is mounted on the axle of the knob and driven by the spiral power spring. A gear train, which includes a first gear, a second gear, a drive shaft, a third gear and a forth gear, is provided for driving the dynamo. Two conductor strips extends from the dynamo to a bulb which is lit by current passing from the dynamo to the bulb via the conductor strips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.