Shopping cart theft prevention system

Details Shopping cart theft prevention system Shopping cart theft prevention system

1993-01-27

1994-10-18

Ro, Bentsu

Electricity: motive power systems

Braking

Dynamic braking

318375, 188 112, 188162, 280 33994, 280DIG4, 70226, H02P 312, B60R 2508, B62B 504

Patent

active

053571827

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.

REFERENCES:
patent: 3652103 (1972-03-01), Higgs
patent: 4242668 (1980-12-01), Herzog
patent: 4577880 (1986-03-01), Bianco
patent: 4591175 (1986-05-01), Upton et al.
patent: 5064012 (1991-11-01), Losego
patent: 5194844 (1993-03-01), Zelda

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