Shopping cart theft prevention system
US5357182A · kind A · utility
58Cited by
6References
14Claims
0Family size
Inventors
Key dates
| Filing date | Jan 27, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Jan 27, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5841
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for braking a wheeled vehicle when it is attempted to be moved outside of a defined perimeter wherein at least one wheel of the vehicle is mechanically coupled to a shaft carrying means to create upon rotation of the shaft, through electromagnetic action an electric current at a pair of terminals; circuit means, responsive to a predetermined signal, to short said terminals, thereby creating a counter electromagnetic force to inhibit rotation of said shaft and wheel coupled thereto to brake the latter; means to generate said predetermined signal; and means to radiate said signal locally along said perimeter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.