Magnetic detection system for items on the lower tray of a shopp

Details Magnetic detection system for items on the lower tray of a shopp Magnetic detection system for items on the lower tray of a shopp

1986-09-15

1988-02-02

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

186 62, G08B 1314

Patent

active

047231181

ABSTRACT:
A detection system for use by a checkout clerk in a checkout line to detect a load left on the lower tray of a shopping cart by the customer. The shopping cart has a lower tray pivotably mounted on a frame. The tray is movable between a first and second position when a load is placed on the tray. A field producing source such as a permanent magnet contained within a shield material is attached to the cart, and the field is actuated at a distance when the tray is moved from the first to the second position by displacing the magnet and the shield material. A detector for detecting the presence of that field as the shopping cart passes through the checkout line is coupled to a control circuit capable of signaling the checkout clerk that the load is on the lower tray.

REFERENCES:
patent: 3263774 (1966-08-01), Reese
patent: 3778808 (1973-12-01), Stevens
patent: 4327819 (1982-05-01), Coutta

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