Secure closure
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Solution Overview
Problem
Existing security door locks are vulnerable to unauthorized entry through the gap between the door jamb and edge, allowing leverage to flex or warp the structure, enabling unauthorized access.
Innovation Solution
A secure closure system featuring a locking bolt extendable from the door's free edge, receivable in a slot formed by a barrier panel and door guard member, which intersect with the bolt's path, providing additional reinforcement and resistance to warping or distortion, and a hinged door mechanism with a robust structure made from steel plates and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional security door lock is used with a gap between the door jamb and door edge, then the door can be easily opened, but the structure allows leverage attacks that can flex or warp the door and jamb
Solution Approach 1:
The patent introduces a door guard member that extends from the door in a direction transverse to the door plane, creating a third-dimensional barrier. This guard member projects into the gap space between the door and jamb, preventing lever insertion from the traditional two-dimensional plane of the door edge, thereby eliminating the vulnerability to wedge attacks while maintaining normal door operation
Solution Approach 2:
The door guard member acts as an intermediary element between the door and the potential lever tool. By positioning this guard member in the gap space, it serves as a protective mediator that blocks the direct contact between the lever and the vulnerable gap, preventing the transmission of flexing forces to the door and jamb structure
2Reliability
If the door structure is reinforced to prevent warping, then unauthorized entry is prevented, but the complexity of the door lock system increases
Solution Approach 1:
The patent divides the protective function into separate components: the door guard member that prevents lever insertion, the locking bolt that secures the door, and the barrier panel that provides additional structural support. This segmentation allows each component to perform its specific function independently, achieving high reliability without requiring a monolithic complex system
Solution Approach 2:
The door guard member is positioned specifically at the critical vulnerability point where the gap between door and jamb allows lever insertion. This localized protection approach addresses the specific security weakness without requiring reinforcement of the entire door structure, thereby maintaining simplicity while achieving high reliability at the critical location
Data Source
AI summary
A security door lock with a hinged door and a locking assembly. The door jamb has a number of apertures formed in a bolt receiving side of the jamb to receive a corresponding number of door bolts extendable from an outer free edge of the door. The locking assembly has a barrier panel spaced from the jamb to define a narrow longitudinal slot is adapted to receive a door guard member extending normally from an internal surface of the door adjacent the outer free edge, and is reinforced by the barrier panel against lateral flexing or distortion. A handle mechanism controls the lateral movement of the closure and the retraction or extension of the locking bolts.