Shopping Cart Wheel Sensing for Misuse Tracking and Brake Control
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Solution Overview
Problem
Existing cart containment systems are ineffective in detecting misuse such as shopping cart theft or improper use, as they only deter cart removal and do not monitor cart status or location within the store, and they do not address issues like excessive cart retrieval or locked wheels during cart retrieval operations.
Innovation Solution
A system equipped with sensor-rich wheels that include rotation, vibration, VLF, EAS, and magnetic field sensors, coupled with an RF transceiver for real-time data communication, allowing for tracking and management of cart locations and statuses, enabling authorization or blocking of cart actions, and providing data for store optimization and customer interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing cart containment systems use wire-based electromagnetic detection, then cart theft is deterred, but the system cannot detect other types of misuse such as merchandise theft or improper cart retrieval
Solution Approach 1:
The shopping cart wheel is designed to perform multiple functions: it contains sensors for detecting electromagnetic signals from containment wires, vibration sensors for detecting skid events, rotation sensors for monitoring wheel movement, and RF transceivers for wireless communication. This multi-functional design allows a single component to address various types of cart misuse including theft, improper retrieval, and merchandise surveillance.
Solution Approach 2:
The system introduces an RF transceiver as an intermediary communication device that enables wireless data transmission between the cart sensors and the central monitoring system. This intermediary allows real-time cart status information to be transmitted without physical wire connections, enabling comprehensive monitoring while maintaining cart mobility.
2Productivity
If power-assisted cart retrieval units retrieve multiple carts at once, then operational efficiency is improved, but the risk of retrieving carts with locked or improperly oriented wheels increases
Solution Approach 1:
The system performs preliminary detection of cart wheel status (locked/unlocked, proper orientation) before the cart retrieval unit attempts to retrieve the cart. The sensors in the wheel detect the cart's state and communicate this information in advance, allowing the retrieval system to verify suitability for retrieval before initiating the retrieval process.
Solution Approach 2:
The system implements continuous feedback through RF communication between the cart sensors and the central monitoring system. The cart's real-time status (wheel lock state, orientation, skid events) is transmitted to the retrieval unit control system, which uses this feedback to determine whether to proceed with retrieval, thereby preventing retrieval of improperly positioned or locked carts.
3Reliability
If EAS tags are attached to merchandise items to detect theft, then theft detection capability is improved, but the cost and operational burden increase significantly
Solution Approach 1:
The system combines multiple detection capabilities (VLF electromagnetic signal detection, EAS signal detection, vibration sensing, RF communication) into a single integrated cart wheel assembly. This merging eliminates the need for separate EAS tags on individual merchandise items, as the cart itself becomes the detection device, reducing overall system complexity while maintaining theft detection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents unauthorized cart exit and misuse by locking wheels, optimizes cart retrieval operations, and provides insights for store layout adjustments and customer behavior analysis, enhancing security and operational efficiency.
Implementation Method 1
a VLF (Very Low Frequency) signal detector for detecting signals used by conventional cart containment systems
Implementation Method 2
an EAS (Electronic Article Surveillance) signal detector capable of detecting conventional EAS towers
Implementation Method 3
a magnetic field sensor capable of detecting encoded magnetic markers placed on or under store flooring or pavement to mark specific locations
Data Source
AI summary
A system is disclosed for tracking and controlling shopping carts or other types of human-propelled vehicles. In one embodiment, the system includes a wheel or wheel assembly with a braking mechanism that is activated in response to signals received by multiple receivers. The receivers may, for example, include a VLF (Very Low Frequency) receiver for detecting a VLF signal transmitted by a buried cable, and an RF transceiver for communicating over a wireless network. The receivers may, but need not, be included in the wheel. The multiple receivers may be used in combination to control a shopping cart; for example, a command received by a shopping cart's RF transceiver may cause the cart to ignore (not activate the brake in response to) a detected VLF signal.