Door Bottom Security Strip with Deflecting Element
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Solution Overview
Problem
Existing burglary protection devices for doors, particularly the underside, are inadequate as they can be easily bypassed using tools like a goat's foot or wire, and lack sufficient security features to prevent unauthorized access or tool penetration.
Innovation Solution
A burglary protection device featuring a security strip with a defensive element that prevents tools from being pushed under, including a sloping extension or horizontal base, which can deflect or block tools, combined with a mechanical lowering mechanism for automatic activation when the door is closed, providing enhanced sealing and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional drop seal is used to seal the gap between the door leaf and the floor, then sealing effectiveness against drafts, noise, and light is improved, but burglary protection is worsened as the seal can be easily lifted with a crowbar or bypassed with a wire
Solution Approach 1:
The protective device is divided into multiple functional segments: a sealing strip for draft/noise/light sealing, a deflecting element for preventing tool insertion, and a lowering mechanism for automatic deployment. Each segment performs a specific function, collectively providing both sealing and burglary protection without compromising either aspect.
Solution Approach 2:
The protective device combines different material properties in a single integrated structure: a flexible sealing profile (rubber/silicone) for sealing, a rigid deflecting element (metal or hard plastic) for burglary protection, and a mechanical lowering mechanism. This composite structure simultaneously achieves sealing effectiveness and burglary resistance.
2Ease of operation
If the underside of the door is left without additional protection to maintain ease of operation, then accessibility for disabled people and smooth door operation are improved, but security against tool insertion and prying is worsened
Solution Approach 1:
The protective device features a dynamic lowering mechanism that automatically deploys the security strip and deflecting element when the door closes. This dynamic action provides burglary protection only when needed (door closed), while maintaining ease of operation (no manual intervention required) and accessibility (no permanent obstacle when door is open).
Solution Approach 2:
The lowering mechanism is automatically actuated by the door closing action itself, using the door's movement to trigger the deployment of the protective elements. This self-service mechanism eliminates the need for separate actuators, sensors, or power sources, maintaining ease of operation while providing effective security.
3Object-affected harmful factors
If a mechanical lowering mechanism is added to provide automatic sealing and security, then burglary protection and sealing are improved, but device complexity is worsened
Solution Approach 1:
The lowering mechanism serves multiple functions simultaneously: it deploys the sealing strip for draft/noise/light sealing, positions the deflecting element for burglary protection, and can provide mechanical support for the security strip. This multi-functionality reduces the need for separate mechanisms, thereby limiting the increase in device complexity while maximizing protective benefits.
4Object-affected harmful factors
If the deflecting element is designed with a downwardly oblique extension to prevent tool insertion, then burglary protection is improved, but manufacturing precision requirements are worsened to ensure proper seating and force distribution
Solution Approach 1:
The deflecting element is pre-formed with the optimal downwardly oblique extension angle and geometry during manufacturing. This preliminary action ensures that the element is pre-positioned and pre-shaped to effectively deflect tools, reducing the precision requirements during installation. The element arrives ready-to-install with its protective geometry already optimized.
Data Source
Figure 1~2
Figure 3~4
Figure 5a
AI summary
An anti-burglary device for a door comprises a locking bar (3) for mounting on or in a door leaf (F) and for closing a gap between the door leaf (F) and the bottom of the door (6). The locking bar (3) can be moved from a raised position to a locked position, in which it closes the gap when the door is closed. The locking bar (3) has a locking element (32, 31, 33) whose shape prevents the locking bar (3) from being reached under and penetration between the locking bar (3) and the bottom of the door (6). This anti-burglary device provides optimal protection against break-ins, even when a crowbar or wire loop is used as a burglary tool.