Blast-Resistant Bulletproof Window Edge Groove Fixation
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Solution Overview
Problem
Existing bulletproof vehicle windows are prone to deformation and displacement during blasts or explosions, potentially allowing the glass to fall into the vehicle interior or exterior due to forced deformation of the frame, posing a risk to passengers.
Innovation Solution
A blast-resistant bulletproof window design featuring a ballistic block with edge grooves and recesses, combined with a bullet-resistant armoring device that engages these features on the vehicle body, preventing the window from falling by distributing pressure evenly and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bulletproof window with a single fixation point is used, then the structure is simple, but the window can deform and shift during blasts, allowing glass to fall into the vehicle interior
Solution Approach 1:
The fixation system is segmented into multiple independent fixation points (protrusions and corresponding recesses) distributed around the window periphery. This segmentation allows the window to be secured at multiple locations, preventing deformation and glass fall during blasts while maintaining a relatively simple overall structure.
Solution Approach 2:
The protrusions and recesses are pre-formed during manufacturing, creating a ready-to-engagement fixation system before the window is installed. This preliminary preparation ensures that when the window is subjected to blast forces, the fixation points are already in position to prevent deformation and glass fall without requiring additional active components.
2Strength
If the frame is made rigid to prevent deformation, then structural strength is improved, but the frame may still shift or break under extreme blast pressure, causing glass to fall
Solution Approach 1:
The fixation system incorporates controlled flexibility through the interaction between protrusions and recesses. The frame can deform elastically within the recesses during blast events, absorbing energy while maintaining the window in position. This dynamic response prevents both frame failure and glass fall, combining strength with adaptability.
3Reliability
If multiple layers of glass are used to prevent glass fall, then protection is improved, but the weight and complexity of the window structure increase
Solution Approach 1:
The window structure is segmented into a ballistic block and separate glass panes with dedicated fixation points. This segmentation allows each component to be optimized independently - the glass panes can be thinner since they are securely fixed at multiple points, reducing overall weight while maintaining glass retention capability during blasts.
4Reliability
If the window is fixed tightly to the frame, then position stability is improved, but blast pressure cannot be distributed, concentrating stress on fixed points
Solution Approach 1:
The fixation system uses multiple distributed protrusions and recesses around the window periphery. This segmentation distributes the blast pressure across many fixation points rather than concentrating it at a single location, reducing stress at each individual fixation point while maintaining overall window position stability.
Solution Approach 2:
The fixation system transitions from a single-point fixation to a distributed multi-point fixation system. By adding the dimension of spatial distribution with multiple fixation points around the periphery, the system simultaneously achieves position stability and stress distribution, avoiding stress concentration at any single location.
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 effectively prevents the window from falling into or out of the vehicle, ensuring passenger safety by maintaining the window's position and distributing blast pressure across a larger surface, enhancing both blast and bullet resistance.
Implementation Method 1
An insert made of steel is fixed in the groove by means of an adhering layer
Data Source
Figure 1
AI summary
The present invention refers to a blast-resistant bulletproof window (1) and a corresponding appartus, in particular for use in a motor vehicle, which comprises a ballistic block (11) having a peripheral edge (11.1) and a plurality of panes of glass (4, 6, 8), ceramic or plastic material (10, 15) bonded to each other over their surfaces in a layered composite, and interposed bonding interlayers (5, 7, 9, 14) of plastic material or adhesive, wherein at least one edge groove (12) with particularly rectangular cross section is provided on and along at least a part of the peripheral edge (11.1), and an edge recess (13) is provided on an inside surface (11.2) of the ballistic block (11) or window (1) on and along at least a part of the peripheral edge (11.1) of the window (1).