| 摘要 |
A method for complicating the theft of shopping trolleys ( 11 ) which are made available to customers in self-service stores ( 1 ). Every shopping trolley ( 11 ) is provided with a transponder ( 12 ) having the same identification key. At least one monitoring device ( 14 ) corresponding with the transponders ( 120 of the shopping trolleys ( 11 ) is provided in at least one suitable position of an exterior area ( 2 ) pertaining to the self-service store ( 1 ), for example a customer car park ( 4 ). When the shopping trolley ( 11 ) passes the monitoring device ( 14 ), the monitoring device ( 14 ) changes the identification key of the transponder ( 12 ) of said shopping trolley ( 11 ) to a new identification key. When a shopping trolley ( 11 ) having a changed identification key passes a predetermined position ( 10 ) inside the self-service store ( 1 ), a check device ( 13 ) associated with the predetermined position ( 10 ) changes the changed identification key back to its original identification key, and the change-back process effected by the check device ( 13 ) triggers a signal.
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