Cut-Resistant Security Strap With Embedded Filaments
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Solution Overview
Problem
Existing security straps are not sufficiently resistant to cutting, allowing quick and easy breaking, which poses a risk during attempted breaches.
Innovation Solution
A security strap with embedded multifilament cables in a thermoplastic or thermosetting elastomeric material, featuring a planar array and primer-coated cables to enhance bonding, along with lock units at either end, designed to hinder cutting by presenting an unstable target and restricting filament movement within the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a strap uses embedded wires or cables in elastomeric material, then the strap gains flexibility and ease of operation, but the cut resistance is insufficient allowing quick and easy breaking
Solution Approach 1:
The cable is divided into multiple filaments (at least 5, preferably 7-15) that are embedded individually in the elastomeric material. This segmentation creates an unstable target for cutting devices, as the filaments can move independently and the cutting blade cannot engage continuously. The segmented structure maintains flexibility while providing cut resistance through the distributed filament arrangement.
Solution Approach 2:
The filaments are designed to be mobile within the elastomeric material, allowing them to move and shift position during cutting attempts. This dynamic behavior prevents the cutting blade from establishing a stable engagement point, as the filaments continuously change their configuration. The mobility is maintained through the embedding process that allows filament movement while maintaining structural integrity.
2Ease of operation
If the filaments are freely movable within the elastomeric material, then the strap maintains flexibility and flexibility during bending, but the filaments can be easily separated and cut
Solution Approach 1:
A bonding agent is applied to the filaments before embedding in the elastomeric material. This intermediary substance creates a controlled bond between the filaments and the elastomeric matrix, allowing the filaments to move relative to each other during flexure while preventing complete separation. The bonding agent provides just enough adhesion to maintain cohesion during normal use, but not enough to prevent filament mobility that would enable easy cutting.
Solution Approach 2:
The embedding process controls the physical and chemical parameters of the filament-material interface. The elastomeric material is applied at specific temperatures and pressures to create an optimal bond that balances flexibility and cohesion. The embedding depth, material composition, and processing conditions are adjusted to achieve the desired balance where filaments remain connected during normal operation but can move independently to resist cutting.
3Ease of manufacture
If the strap uses a planar array of cables, then the manufacturing process is simplified and the strap maintains structural integrity, but the cut resistance is reduced compared to three-dimensional configurations
Solution Approach 1:
The patent transitions from traditional two-dimensional planar cable arrangements to a three-dimensional embedded configuration where filaments are distributed throughout the elastomeric volume. This dimensional change allows the filaments to be positioned at multiple depths and orientations, creating a more complex and resistant target for cutting devices. The three-dimensional arrangement maintains manufacturing feasibility while significantly improving cut resistance through volumetric distribution of the cutting-resistant elements.
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 strap effectively resists cutting attempts, requiring multiple unsuccessful tries due to the mobility and confinement of filaments, thereby discouraging swift breaking and enhancing security.
Implementation Method 1
the cables have a coating of primer for creating a bond with the material
Implementation Method 2
a plurality of longitudinally extending multifilament cables embedded in an elastomeric material
Data Source
Figure 1~3
Figure 4~5A
Figure 6~7
AI summary
A security device has a flexible strap (26) with a lock unit (28) attached at each end. The strap (26) comprises a plurality of longitudinally extending multi-filament cables or ropes (2) arranged in a substantially planar array embedded in an elastomeric material (4). The cables or ropes (2) have a coating of primer for creating a bond with the elastomeric material (4). The primer may be restricted to the external surface of the cables or ropes (2), or some of the surfaces of the filaments may be free of primer. This facilitates relative movement of the filaments during flexure or compression of the strap (26). Moreover, an extrusion process for manufacturing the strap (26) including a priming station (12) is disclosed.