Monitoring device for monitoring the passage of objects through passage
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United States of America Patent
Stats
-
Mar 19, 1996
Grant Date -
N/A
app pub date -
May 26, 1994
filing date -
Jun 11, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A supermarket trolley monitoring system is provided for detecting shopping items on a lower shelf of the trolley as the trolley moves through a check-out station. Three transmitter/receivers are provided. The first and third at level A respond to light reflected by a panel 36 on the side of the trolley. The system is turned on when the panel 36 passes the first transmitter/receiver and off when the panel 36 passes the third transmitter/receiver. The second transmitter/receiver is mounted above A and if any object is detected while the system is ON, by reflection of the beam from the object, a warning is provided to alert a check-out assistant and/or a shopper that an item is present on the lower trolley shelf which may not have been entered in a till.
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