Immobilizer for shopping trolleys

Details Immobilizer for shopping trolleys Immobilizer for shopping trolleys

2006-02-18

2011-10-04

Vanaman, Frank (Department: 3618)

Land vehicles

Wheeled

Nesting vehicles

Reexamination Certificate

active

08029005

ABSTRACT:
A principle for alternately activating and deactivating a blocking device by means of a magnetic field. A further developed embodiment of the invention is provided in that the deactivating magnetic field can be smaller than the activating magnetic field.

REFERENCES:
patent: 2964140 (1960-12-01), Berezny
patent: 3031037 (1962-04-01), Stollman
patent: 3117655 (1964-01-01), Skupas et al.
patent: 3495688 (1970-02-01), Isaacks
patent: 4591175 (1986-05-01), Upton et al.
patent: 6173817 (2001-01-01), Gray
patent: 2 384 175 (2003-07-01), None

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