Shopping Cart Electromagnetic Wheel Locking System
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Solution Overview
Problem
Retail establishments face losses due to shopping cart theft and damage caused by unattended carts rolling into structures or people, leading to increased overhead and customer costs for repairs.
Innovation Solution
A shopping cart equipped with an electromagnetic generator and a locking mechanism that restricts wheel rotation using a resistive load, controlled by a switch, Wi-Fi receiver, GPS receiver, and sensors to prevent theft and unattended rolling, with the system allowing free rotation when within a designated area or in the presence of a customer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism with electromagnetic generator and resistive load is added to the shopping cart, then theft prevention and damage prevention are improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical locking mechanisms with an electromagnetic generator-based system. The electromagnetic generator converts mechanical energy from wheel rotation into electrical energy, which then activates a resistive load to create electromagnetic resistance, locking the wheels. This substitution of mechanical systems with electromagnetic fields resolves the contradiction by providing reliable theft prevention through sophisticated electromagnetic control while avoiding the bulk and complexity of traditional mechanical locks.
Solution Approach 2:
The patent utilizes parameter changes in the electromagnetic generator's operational states to achieve different functions. By varying the electrical circuit configuration (connected vs. disconnected states of the resistive load), the system dynamically changes the electromagnetic resistance parameter applied to the wheels. This allows the same component to provide both free rotation during normal use and locked rotation during theft prevention, resolving the contradiction between reliability and device complexity.
2Reliability
If the electromagnetic generator is connected to the resistive load to restrict wheel rotation, then theft prevention is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service through automatic detection systems that sense whether the shopping cart is within the retail establishment boundaries. When the cart attempts to leave the designated area, the system automatically connects the electromagnetic generator to the resistive load, creating electromagnetic resistance without requiring any action from the customer. This resolves the contradiction by maintaining ease of operation during legitimate use while automatically activating theft prevention when needed.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor the shopping cart's location and operational state. Based on this feedback, the control system automatically adjusts the electrical connection state of the electromagnetic generator. When the cart is within acceptable parameters, the resistive load remains disconnected allowing free operation. When boundary violations or unauthorized removal are detected, the system feeds back by connecting the resistive load to restrict rotation, thus resolving the contradiction between reliability and ease of operation.
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 solution reduces overhead costs for retail establishments by preventing theft and damage, and minimizes customer costs for repairs by ensuring the shopping cart remains stationary when not in use or outside designated areas.
Implementation Method 1
an electromagnetic generator operatively coupled to at least one of the wheels. A resistive load can be selectively connected between an input and an output of the electromagnetic generator to selectively restrict rotation of the at least one of the wheels
Data Source
AI summary
Exemplary embodiments are generally directed to shopping carts and associated systems and methods. Exemplary embodiments of the shopping cart include a shopping cart body and a plurality of wheels supporting the shopping cart body. Exemplary embodiments of the shopping cart include a receiver configured to detect a position of the shopping cart relative to a range of a network or an area defined by a geo-fence. Exemplary embodiments of the shopping cart include an electromagnetic generator operatively coupled to at least one of the plurality of wheels. A resistive load can be selectively connected between an input and an output of the electromagnetic generator to restrict rotation of the at least one of the plurality of wheels as the position of the shopping cart detected by the receiver varies between within or outside of the range of the network or the area defined by the geo-fence.