Armored Roller Shutter Slats With Overlapping Steel Bar Reinforcement
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Solution Overview
Problem
Existing roller shutters face challenges in providing adequate burglary protection against tools like portable cutting discs and are susceptible to being pulled out of tracks or cut, especially in large openings.
Innovation Solution
The invention introduces an armored security slat for roller shutters with internal chambers containing steel bars, featuring overlapping bars for enhanced rigidity and resistance to breaking, cutting, and pulling, combined with aluminum slats for improved mechanical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic slats are used for roller shutters, then the shutter is cheap and light, but it provides insufficient burglary protection against cutting and breaking
Solution Approach 1:
The slat is constructed as a composite structure combining plastic material with embedded steel bars. The plastic provides lightweight and cost-effective properties, while the steel bars provide enhanced strength and burglary protection. This composite approach resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The steel bars are strategically positioned within the slat structure at critical locations where strength is most needed, such as along the length of the slat and at connection points. This localized reinforcement provides maximum burglary protection while minimizing the amount of heavy material used, maintaining the lightweight advantage.
2Strength
If aluminum slats are used instead of plastic, then burglary protection against deterioration and braking is improved, but the shutter remains vulnerable to being pulled out of tracks
Solution Approach 1:
The slat combines aluminum or plastic material with embedded steel bars to create a composite structure. The steel bars provide superior strength not only against braking and deterioration but also against being pulled out of tracks, as they reinforce the entire slat structure and increase resistance to tensile forces.
3Strength
If steel bars are added to slats for extra protection, then resistance against braking and pushing out of tracks is improved, but the slat becomes more susceptible to being pulled out by ropes or cables
Solution Approach 1:
The steel bars are nested within the slat structure, embedded in channels or cavities of the aluminum or plastic material. This nesting arrangement allows the steel bars to provide reinforcement against all types of forces including pulling, as the bars are constrained within the slat structure and work together with the outer material as an integrated unit.
4Strength
If large grate structures are used for factory openings, then strength is improved, but the shutter can still be pulled out by tying ropes or cables
Solution Approach 1:
The large grate structure for factory openings is constructed using the same composite principle of embedding steel bars within aluminum or plastic slats. This provides uniform reinforcement across the entire structure, preventing it from being pulled out by ropes or cables, while maintaining the large opening capability for factory applications.
5Illumination intensity
If perforations are provided in slats for light and air passage, then visibility and ventilation are improved, but burglary tools can be inserted through the perforations
Solution Approach 1:
The steel bars are positioned to provide reinforcement at the perforation areas and along the slat structure. The bars are strategically located to maintain structural integrity at critical points while allowing perforations to be provided for light and air passage. This localized reinforcement prevents burglary tool insertion through the perforations while maintaining ventilation functionality.
Data Source
AI summary
A slat for use in a roller shutter has an elongated body. The elongated body has an upper engaging arrangement in an upper portion thereof, and, a lower engaging arrangement in a lower portion thereof. The body is provided with at least one chamber having at least one bar. The at least one bar of a given slat has a vertical overlap with the at least one bar of the slat that is engaged with the given slat and upwardly therefrom. When the slat has a first bar within an upper chamber and a second bar within a lower chamber, the first bar overlaps with the second bar in a lengthwise direction along an internal overlap.