Anti-theft Device with Segmented Locking and Detection Modules
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Solution Overview
Problem
Existing anti-theft devices for items with necks, such as bottles and sports equipment, are inadequate as they can be easily broken or removed due to the combination of detection, locking, and strap-locking means being in a single molded part, which is prone to failure under moderate effort.
Innovation Solution
An anti-theft device featuring a notched strap with a free end locked into a block, incorporating a hollow neck with a weight that is longitudinally movable and lockable, along with a detection block housing an RF or AM loop, and additional locking mechanisms like teeth or a pawl to prevent unintentional unlocking, and reinforced with metallic inserts for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If detection, locking, and strap-locking means are combined in a single molded part, then device complexity is reduced, but reliability deteriorates as the device can be easily broken or removed under moderate effort
Solution Approach 1:
The device is divided into separate functional modules: a detection block containing the detection means, a locking block with the locking mechanism, and a separate strap assembly. This segmentation allows each component to be optimized independently and prevents failure of the entire device if one part is compromised, directly resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The strap is pre-formed with notches and the locking block is pre-configured with the weight and locking surfaces. The strap is inserted through the locking block and automatically locked by the weight engaging with the notched surfaces before any theft attempt occurs, ensuring reliability from the outset rather than relying on the integrity of a single molded structure.
2Ease of manufacture
If a simple molded part structure is used, then ease of manufacture is improved, but strength deteriorates as the device is prone to failure under moderate effort
Solution Approach 1:
By segmenting the device into separate components (detection block, locking block, strap), each part can be manufactured using simple, cost-effective processes while the assembled structure achieves the required strength. The locking block and detection block can be molded separately using standard plastic injection molding, avoiding the need for complex single-piece molding while maintaining structural integrity.
Solution Approach 2:
The device combines different materials to achieve both ease of manufacture and strength: plastic components for the blocks (easy to mold) and metallic elements (such as the weight or reinforcement elements) for strength and durability. This composite approach allows each material to contribute its optimal properties while maintaining manufacturing simplicity.
3Manufacturing precision
If the loop size is fixed, then manufacturing precision is improved, but adaptability deteriorates as the loop cannot be engaged around articles with necks of varying sizes
Solution Approach 1:
The strap is designed as a flexible, adjustable length component that can be extended or contracted to accommodate different neck sizes. The notched surfaces on the strap work with the locking block to maintain precise locking engagement regardless of the strap's extended length, combining the precision of fixed-dimensional locking surfaces with the adaptability of an adjustable strap length.
Solution Approach 2:
The separation of the strap (flexible, adjustable length) from the locking block (fixed, precise dimensions) allows the strap to adapt to various neck sizes while the locking block maintains precise dimensional control for reliable locking. This segmentation enables the system to combine adaptability with manufacturing precision.
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 device provides robust protection against theft by ensuring the strap remains securely locked and detectable, even under axial impacts, while being adaptable to various neck sizes and shapes without causing damage, thus enhancing the effectiveness of anti-theft measures.
Implementation Method 1
a weight with a locking front surface, the weight being longitudinally movable inside the cylindrical neck and lockable in the locking position by a locking means
Implementation Method 2
an electronic component, usually passive, capable of being detected if it is immersed in an electromagnetic field, normally generated at the guided exit of a shop or an establishment
Data Source
AI summary
An anti-theft device comprises a notched strap having a free end and an end rigidly connected to a block, which locks the notched surface of the strap in the closed position when the free end is inserted into an insertion slot provided in the locking block. The anti-theft device further comprises theft detection means.