Bayonet Cable Lock with Oval Plug for Tamper Detection
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Solution Overview
Problem
Existing EAS tag security devices are bulky, require complex mechanical mechanisms for locking and unlocking, and often fail to sound an alarm during attempts to break the cable, with issues of cable twisting causing false negatives and non-automatic alignment of connectors with locking mechanisms.
Innovation Solution
A cable alarm security device featuring a flexible cable with a two-stage bayonet plug, magnetically actuated locking mechanism, and an alarm system that sounds when the cable is forcibly removed, utilizing a mechanical fuse to maintain attachment and initiate an alarm upon tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing cable connectors are used (cylindrical or polygonal), then alignment with locking mechanism is achieved, but insertion and rotation require excessive force and are not automatic
Solution Approach 1:
The bayonet plug incorporates an asymmetric keyway configuration where the cable connector has a specific angular orientation that matches the locking mechanism's keyway. This asymmetric design enables automatic alignment during insertion, eliminating the need for excessive force or manual rotation while maintaining secure engagement with the locking elements.
2Reliability
If cable is forcibly removed from device, then unauthorized removal is prevented, but alarm system fails to sound due to cable twisting shorting the sense loop
Solution Approach 1:
The cable assembly is segmented into multiple independent sense loops rather than a single continuous loop. This segmentation ensures that if one portion of the cable is twisted or damaged, other sense loops remain intact and functional, maintaining alarm activation capability. The multiple loops provide redundant detection paths that are not mutually dependent.
Solution Approach 2:
The alarm system incorporates a mechanical fuse or defeat mechanism that detects forced removal attempts before the cable is completely severed or twisted beyond recovery. This preliminary detection mechanism triggers the alarm in advance, compensating for the potential failure mode of cable twisting that would otherwise prevent alarm activation.
3Ease of operation
If cable lock security device is made compact and simple, then ease of application and removal is improved, but locking mechanism may become vulnerable to breaking
Solution Approach 1:
The bayonet plug incorporates self-aligning keyways and locking elements that automatically engage when the cable is inserted into the device. This self-service mechanism eliminates the need for complex manual alignment procedures or multiple adjustment steps, enabling secure locking with a single insertion motion while maintaining structural integrity through properly engineered locking geometry.
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 provides a compact, easily applied and removable security device with a versatile alarm system that effectively detects and alerts against tampering attempts, preventing unauthorized removal while maintaining secure attachment to merchandise.
Implementation Method 1
a magnetically actuated locking mechanism mounted in the housing engageable with the plug
Data Source
AI summary
A security device for attachment to an article to deter theft of the article has a housing containing an alarm system including an audible alarm with a defeat mechanism having a two-part connector that attaches to both a cable and a locking mechanism. The connector includes a mechanical fuse (e.g., two-step ferrule holder) that provides defeat prevention of the alarm device. The locked device alarms if pulled too hard from twisting the cable without releasing the primary lock. The connector is preferably shaped as a generally elliptic cylindrical bayonet having an oval transverse cross-section and a truncated oblique cone-shaped distal end. This enables the plug to be inserted into a locking channel of the locking mechanism in either of two directions facilitating the locking of the attached cable about an article of merchandise. Moreover, the oval shape takes up less space than a round bayonet while providing greater strength through longer latch engagement area on the wider side of the bayonet, especially as opposed to a circular cross-section bayonet.