RFID Tag Carrier Layout to Avoid Pusher Spring Shielding
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Solution Overview
Problem
Existing pusher type retail shelving systems often have RFID tags shielded by the unwound spring coil, rendering them undetectable by readers, and existing solutions require complex installation and training.
Innovation Solution
An elongated, rigid carrier with a linear array of RFID tags is used, which can be easily installed in pusher dispensers, providing a snug fit and effective shielding, and can be 3-D printed for adaptability to various configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags are mounted on the integral shelf floor beneath the pusher coil spring path, then the system can provide inventory tracking capability, but the unwound spring coil shields the RFID tags from detection by readers rendering the system inoperative
Solution Approach 1:
The patent extracts the RFID tags from the integral shelf floor and relocates them to a separate carrier assembly positioned above the spring coil path. This separation removes the shielding effect of the spring coil, allowing RFID readers to detect tags without interference while maintaining inventory tracking functionality.
Solution Approach 2:
The patent positions RFID tags in a different spatial dimension (above the spring coil path rather than beneath it) to avoid the shielding effect. By changing the vertical positioning of tags relative to the spring coil, the system eliminates detection interference while preserving all RFID functionality.
2Reliability
If RFID tags are installed directly in existing pusher dispensers, then the system can provide real-time inventory tracking, but installation requires complex procedures and training
Solution Approach 1:
The patent combines RFID tags with the pusher assembly into a single integrated carrier unit. This merging allows the RFID tags to be installed simultaneously with the pusher mechanism itself, eliminating separate installation steps and reducing the need for specialized training while maintaining full inventory tracking capability.
Solution Approach 2:
The patent pre-assembles RFID tags onto the carrier before final installation in the dispenser. This preliminary action allows tags to be positioned and secured in advance, simplifying the final installation process and reducing the skill level required for deployment in existing systems.
3Strength
If RFID tags are positioned to be shielded by the pusher coil spring, then the spring can maintain its structural function, but the tags cannot be detected by readers
Solution Approach 1:
The patent segments the pusher assembly into distinct functional components: the spring mechanism remains in its original position to maintain structural function, while RFID tags are placed on a separate carrier in a different spatial zone. This segmentation allows both spring strength and RFID detection precision to be optimized independently without compromise.
Data Source
AI summary
The combination of a pusher dispenser having a coil spring resiliently urging a plate towards a front of the dispenser, a track for guiding the plate, a bottom surface along the track, and an electrically non-conductive insert supported by the bottom surface and having a length, a plurality of RFID tags attached to the insert along its length, the insert supporting the RFID tags at a level adjacent and below an extension of the coil spring whereby an extension of the coil spring is effective to shield the RFID tags from a reader.