Retail Security Device Sensor Rotation Mechanism
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Solution Overview
Problem
Retailers face challenges in securing expensive merchandise from theft, as determined shoplifters can detach items from security displays or remove the security devices themselves, despite the use of mechanical locks and other security measures.
Innovation Solution
A merchandise security device featuring a printed circuit board, a base with a sensor to detect unauthorized removal, and a tether system with a spool for extending and retracting, which rotates the circuit board while keeping the sensor stationary, combined with an electronic key for locking and alarming mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical lock mechanism is used to secure the security device to the support, then the security against unauthorized removal is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical lock mechanism with an electronic sensor system that detects when the base is removed from the support surface. The sensor electrically connected to the control circuit provides electronic detection instead of mechanical locking, thereby reducing mechanical complexity while maintaining or improving security through electronic monitoring and alarm capabilities.
Solution Approach 2:
The patent introduces a sensor as an intermediary element between the base and the support surface. This sensor acts as a mediator that detects the presence or absence of the base on the support without requiring direct mechanical locking, thus simplifying the overall system while enhancing detection capabilities.
2Ease of operation
If the printed circuit board rotates with the spool during tether extension and retraction, then the tether mechanism functionality is improved, but the sensor alignment may be affected
Solution Approach 1:
The patent divides the base into two functional segments: the spool assembly that rotates with the printed circuit board during tether operation, and the sensor assembly that remains stationary relative to the base. This segmentation allows the rotating components to function independently without affecting the stationary sensor's alignment and detection accuracy.
Solution Approach 2:
The patent introduces a stationary sensor as an intermediary reference point that remains fixed while the spool and printed circuit board rotate. This stationary sensor mediates between the rotating mechanical components and the external environment, ensuring continuous accurate detection without being affected by the rotation.
Data Source
AI summary
A merchandise security device for securing items of merchandise from theft is provided. The merchandise security device may include a printed circuit board and a base containing the printed circuit board. The security device may include a sensor electrically connected to the printed circuit board and configured to engage a support surface for detecting unauthorized removal of the base from the support surface. The security device may also include a tether configured to be coupled to one or more items of merchandise, and a spool rotatably disposed within the base for winding and unwinding the tether, wherein the tether is configured to be extended and retracted relative to the base. The printed circuit board is coupled to the spool such that the printed circuit board is configured to rotate relative to the base when the tether is extended and retracted, and the sensor is configured to remain stationary when the tether is extended and retracted.