Vandal-Resistant Door Intercom Labels
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Solution Overview
Problem
Existing electric door entry systems are vulnerable to vandalism, particularly attacks on transparent windows that can cause them to darken, making the labels behind them unreadable.
Innovation Solution
The electric door entry system eliminates the transparent window and uses fire-resistant, high-hardness labels made of materials like stainless steel or aluminum, which are difficult to damage or remove, and incorporates a blind housing and gripping mechanisms to prevent tampering and enhance electromagnetic protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent window is used to protect the label, then the label is protected from being torn off, but the window can be damaged by fire or violent blows, making the label unreadable
Solution Approach 1:
The patent removes the transparent window from the label holder, eliminating the vulnerable component that could be damaged by fire or blows. The label is placed directly in a blind housing without any transparent protective window, thus extracting the harmful element from the system while maintaining label protection through alternative means.
Solution Approach 2:
The patent uses a label made of composite material with specific properties: hardness greater than 50 on the Rockwell HRB scale and fire resistance. This composite material approach combines multiple desirable properties (hardness, fire resistance, durability) into a single label structure that can withstand vandalism attempts without requiring a fragile transparent window.
2Reliability
If a transparent window is used to protect the label, then the label is protected from being torn off, but the window darkens when exposed to flame, making the label unreadable
Solution Approach 1:
The transparent window is completely removed from the system. The label is placed directly in a blind housing without any transparent protective element, eliminating the source of the readability problem while maintaining protection through the housing structure and gripping mechanisms.
Solution Approach 2:
The patent specifies that the label should maintain its visual properties under various conditions. By removing the transparent window that could darken, the label's color and text remain consistently visible. The label material itself is designed to maintain its optical properties even when exposed to fire or heat.
3Ease of manufacture
If a soft label material is used, then the label is easy to manufacture and install, but the label can be easily damaged or removed by blows
Solution Approach 1:
The patent changes the physical parameters of the label material, specifically requiring a hardness greater than 50 on the Rockwell HRB scale. This parameter change transforms the label from a soft, easily damaged material to a hard, vandal-resistant material while maintaining manufacturability through standardized production processes for rigid labels.
Solution Approach 2:
The label is made from composite material that combines hardness, fire resistance, and durability properties. This composite approach allows the label to withstand physical attacks while remaining manufacturable through established processes for producing rigid, engineered materials with specific mechanical properties.
4Ease of repair
If the label is made of soft material, then the label is easy to clean and replace, but the label has short service life due to damage
Solution Approach 1:
The patent changes the material parameters to achieve optimal service life while maintaining replaceability. The label uses hard material (Rockwell HRB > 50) that resists damage from vandalism, extending service life. The standardized housing and gripping mechanisms ensure that despite the harder material, the label remains relatively easy to replace when needed.
Solution Approach 2:
The composite material construction provides both durability for extended service life and controlled replaceability. The material properties are engineered to withstand years of exposure and vandalism attempts, while the mechanical design of the housing and gripping mechanisms allows for periodic replacement without excessive difficulty.
5Reliability
If a blind housing is used to secure the label, then the label is difficult to tear off, but the label becomes more vulnerable to electromagnetic fields
Solution Approach 1:
The patent introduces a metallic screen as an intermediary element between the external environment and the label. This screen acts as a Faraday cage, blocking electromagnetic fields from reaching the label and electronic components inside the blind housing. The screen is integrated into the housing structure, providing both mechanical security and electromagnetic protection.
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 significantly increases the system's resistance to vandalism, extends the service life of the labels, and provides easier cleaning and illumination options while maintaining readability.
Implementation Method 1
electrically connecting the labels to the plate makes it possible to form a continuous metal screen which more effectively protects the interior of the electric door entry system from the electromagnetic fields applied from the front face of the electric door entry system
Data Source
Figure 1~2
Figure 3~5
Figure 4~7
AI summary
The door opener has two call buttons (34, 35) and third and fourth call buttons, where each button triggers a call towards an audio phonic handset e.g. mobile phone, of a resident when the button is activated by a visitor. Three replaceable tags and a fourth replaceable tag (40) are associated to the corresponding buttons. Each tag comprises name (66) of the resident when the associated button is activated. The tag is exposed to exterior of the opener without being protected by a transparent window. The tag is made of unbreakable and non-flammable material on which the name is marked.